JP2000309827A - Steelmaking auxiliaries - Google Patents

Abstract

(57) [Abstract] (Modified) [Problem] To effectively utilize steelmaking auxiliary materials made of industrial waste or powdered material by solidification technology using waste plastic as a binder. A method for producing a steelmaking auxiliary agent, comprising 1% or more of waste plastics or various kinds of plastics, which is used as a binder when solidifying powdery or granular steelmaking materials. The raw material of steel making material is mainly aluminum ash material, and as a single raw material: fly ash, various carbon powders, cutting powder of various materials, etc. Powder metal Si or Si alloy as metal material. Powder metal or Al alloy. As a mixture raw material: quartzite + quicklime / aluminum ash + carbon powder. Aluminum ash + quicklime, other composites, etc. Examples of waste plastic or various plastics include plastic bottles
There are polyethylene, polypropylene and polystyrene.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION With the development of the aluminum industry, the amount of aluminum smelt generated has increased in recent years. Although aluminum ash has been partially utilized, most of it is subject to industrial waste treatment, raising serious problems for the aluminum industry in the future. Aluminum ash contains a large amount of aluminum nitride. When this aluminum nitride is left, it reacts violently with moisture to generate harmful ammonia gas. Detoxification is an essential condition for waste disposal, but a difficult response is required.

[0002] In addition, there are many other problems, such as general disposal site problems, social responsibilities such as environmental destruction, and economic problems on disposal costs. These issues are:
It will also weaken the structure of the aluminum industry.
Under the situation that the steel industry is relying on aluminum ash for temporary use, there is no fundamental measure in the aluminum industry.

On the other hand, various plastic parts and products, from plastic containers to everyday products to industrial products, have been utilized in accordance with the change of social lifestyle, and the lifestyle has become full of plastic. Most of the plastics that have finished their role are burned or landfilled. In some cases, they are recycled by separate collection. When recycling waste plastics, foreign materials such as metals, papers, paints, pigments, sand, etc., as well as household waste, are mixed, and it is extremely difficult to separate these foreign materials economically. ing.

[0004] There is also a report that waste plastic as industrial waste is effectively used by blowing in a blast furnace by a recent technology. Some of the other general waste, waste plastic,
After collection, they are sorted and reused after washing. However, most of them are processed without being recycled from the viewpoint of contamination and further from the viewpoint of economy and quality. Some of them are also treated to reduce the volume and solidify.

An object of the present invention is to effectively utilize metallic aluminum and alumina components contained in aluminum ash without treating the aluminum ash as industrial waste, and to reform the material into a useful steelmaking material. According to the present invention, aluminum ash which is troublesome for treatment can be completely utilized, and the problem of waste is completely released.

[0006] On the other hand, in the metallurgy field of steel production, there is an influence on a natural environment of a fluorine compound represented by fluorite and the like, so that it is necessary to remove fluorite. Fluorite is the most typical flux in steel refining. It is a slag-making material and can exert an effective action on high-melting quicklime which is a refining material.

[0007] It is a known fact from previous research that in an iron and steel metallurgy, an alumina component exerts an effective effect as a flux replacing fluorite. However, a high-quality and inexpensive alumina raw material has not been able to appear. The present invention relates to the supply of the product of the present invention to the alumina raw material at this time.

[0008] The aluminum ash also contains fine metal aluminum which effectively acts on metallurgical refining. Aluminum ash is in powder form, and it is difficult to add aluminum ash under high temperature refining as it is, and there are many problems in efficiently reacting the effective metal Al. Generally, it is used by mechanical briquetting to apply pressure or by injection. It relates to solidification utilizing waste plastics at this time.

[0009] In addition to replacing fluorite as a flux,
The solidified aluminum ash plays an effective role in suppressing slag forming or acting as a soothing material during refining, as slag reforming including slag reduction, and as auxiliary energy. Become.

[0010]

2. Description of the Related Art Aluminum ash is produced from the following processes and is completely unnecessary from the aluminum refining process. Furthermore, it raises many problems even when treating waste. Aluminum produced by electrolysis from alumina must have its melting point adjusted in order to improve or improve its characteristic values. , For each application.

Through the melting step, a compound with nitrogen in the atmosphere and nitrogen in the atmosphere having a strong affinity for aluminum is generated. The main composition of aluminum ash is therefore alumina, and in part also includes oxides of the added alloys. The trouble is the presence of a nitrogen compound (AlN) as the compound. When the reaction-generated AlN is treated as waste, it comes into contact with moisture.

With the reaction of

[0012]

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Since harmful ammonia gas is generated and accompanied by an exothermic reaction, it poses a serious problem in waste disposal.

In order to treat the above reaction product, aging treatment is performed over a long period of time, or a reaction with a large amount of water is forcibly performed. Have been. This process is an environmentally unfavorable process because it is the emission of ammonia gas to the atmosphere.
In addition, a method of granulation heat treatment and a method of disposing of aluminum nitride by subjecting it to a method of oxidative heat treatment and then disposing them are also employed.

Further, a method of effectively utilizing Al or alumina in aluminum ash has been adopted in recent years. It is also used as a heat insulator and a means for heating molten steel utilizing the heat generated by oxidation of Al, as deoxidation of molten steel and slag by Al in the steel refining process. The addition of aluminum ash to the smelting slag is used for the purpose of obtaining the effect of lowering the melting point of the slag or increasing the smelting ability. However, the supply to steel refining has a low added value, and in fact, it is provided at a considerable cost.

A specific supply method as a steel refining material is as follows.
Examples of briquetting under high pressure, injection using a gas carrier, mixing with other steelmaking materials, for example, C powder, addition using a big bag, and the like have been reported.

In the mechanism for suppressing or calming slag in steelmaking refining, a forming phenomenon occurs due to an increase in the partial pressure of the reaction product gas under the smelting slag. The amount of reaction gas generated with molten iron and molten steel depends on the progress of refining. At this time, the gas release is not constant due to the chemical composition of the slag that covers the molten iron and the physical properties represented by the viscosity, and the slag is not uniform, resulting in a phenomenon of slag forming.

Current measures for suppressing or calming slag forming include dealing with aluminum ash and solidifying and drying sludge generated in the papermaking process as in the case of converter refining. It is correspondence. In addition to papermaking sludge, solidified products such as bark material and sugar cane marc are also provided as the forming suppressing material.

[0019]

[Problems to be solved by the invention] Aluminum scouring
This is an example of a method for producing a composite material of aluminum ash waste as slag at the time of melting and waste plastic having a problem in recycling. The melting point of waste plastic is 250 ° C, even for polyethylene terephthalate in the high temperature range.
Very low temperature range inside and outside. Therefore, it can be easily melted. Utilizing the low-temperature solubility of this kind of waste plastic, aluminum ash can be solidified anhydrously, thus completely suppressing the generation of environmentally harmful ammonia gas, which is a major negative factor in the processing of aluminum ash. Can be done. Furthermore, since the fine metallic aluminum contained in the aluminum ash is solidified without being oxidized, metallic aluminum can be effectively and completely used as a steelmaking auxiliary agent.

The composite steelmaking aid solidified by the method described above is a material containing an alumina raw material and a metal aluminum raw material characteristic of aluminum ash. Aluminum ash is originally a powdery product and is not suitable for supplying materials to the steelmaking refining process. Packing and solidification in paper bags are essential conditions. ADVANTAGE OF THE INVENTION According to this invention, since solidification is attained, without impairing the characteristic of aluminum ash, the new dust problem in a process can also be dealt with. Above all, there is no delay in the reaction such as solidification by the inorganic binder, and the desired effect can be exhibited simultaneously with the addition.

[0021] By being solidified, the range of utilization of the steelmaking aid is expanded. It can respond to bunker charges that require no manpower, and can be added to resist updrafts at high temperatures. Alumina and metal aluminum useful for steelmaking and refining are efficiently added in accordance with the phenomenon under the process. These characteristics can be used to suppress forming, to use as a slag-making material, and to further reduce the effects of slag and the effect of the modifier.

[0022]

In the following description, the problem will be mainly described using an example of aluminum ash as a powdery material.

[Table 1] The composition range of the representative element of aluminum ash is described below.

[0023] In addition to those shown in (Table 1), TiO ₂ and Fe ₂ O ₃ were contained as trace components, and from the flux at the time of refining aluminum slag, K. Na. Cl compound is slightly contained.
% Me-Al (= metal aluminum) in the above representative composition is a substance that can be a useful deoxidizing / reducing material in steelmaking refining. However, since most of the% Me-Al component is a fine powder, its effect is low even when it is added to steelmaking and refining under a high-temperature and oxidizing atmosphere, and it cannot be regarded as an effective composition. Absent. Similarly, since the Al ₂ O ₃ component, which is the main composition of aluminum ash, also exhibits fine powder properties, there are many problems with the addition efficiency including the deterioration of the working environment.

The present invention is extremely effective as a means for measuring the solidification of the seed powder, and the effect can be improved by an inexpensive means. In the solidification method using waste plastic as a binder according to the present invention, two means can be considered. Solidification Method A: Melt Solidification Method Solidification Method B: Mixing / Heating / Pressure Molding Method In this case, waste plastics serving as a solidification binder include waste PET bottles, waste polyethylene, waste polypropylene, waste polystyrene, and the like. Although there is no particular restriction on the type, low-melting waste plastic is preferred. There are paints, pigments, reinforcing materials (fillers) that are contained in the collected waste plastic, some metals, papers, sand, etc. that are contaminants, and foreign materials such as attached household waste. There are no restrictions. However, chlorinated waste plastics are not preferred, and must be separated and sorted to avoid contamination. Hereinafter, an embodiment of a specific solidification according to the present invention will be described.

[0025]

DETAILED DESCRIPTION OF THE INVENTION AND

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the practice of solidification and practical use according to the present invention will be described in detail below. First, an example according to the solidification method A will be described. Melt solidification method: The means for melting the waste plastic to be a solidified binder is not particularly limited. First, waste plastics are put into a metal container with a stirring and mixing device and a heating means from the bottom and the periphery, heated to 300 ° C or more, and the waste plastic is first brought into a molten state. . As the heating temperature rises, the binder waste plastic increases its fluidity. A predetermined amount of powdered aluminum ash is added thereto in accordance with the design of the desired steelmaking auxiliary material. Stir and mix with the addition, and measure the kneading so that the aluminum ash is evenly dispersed. It is also necessary to increase the heating temperature as the amount of aluminum ash increases and measure the viscosity of the waste plastic. However, heating in a high temperature region of 600 ° C. or more must be avoided because it leads to oxidative combustion of metal Al contained in aluminum ash.

The mixture in which a predetermined amount of aluminum ash has been added and the mixture has been uniformly mixed is transferred to a solidification mold, cooled naturally, and solidified. There is no special restriction on the shape of the mold. For example, it may be possible to cope with it by pouring it into a flat mold and measuring solidification. In addition, a special shape can be obtained by solidifying means in a mold having a heating-to-cooling device. The product of the present invention solidified and solidified in the mold (mold)
The size of the mold is determined by the plastic binder. After cooling, it is crushed into a size according to the purpose of the steelmaking aid by a crusher to produce a product. For example, if there is an addition distance such as addition from the furnace top or addition to the top of the reaction zone, or if the reaction needs to be sustained, use a large size of 30 mm or more. In the case opposite to the above when adding, the size is reduced. Since the crushing is brittle due to the mixing of aluminum ash and the like, brittle fracture is easy, it is sufficient to use a very common crushing machine such as a jaw crusher or an impeller mill or a hammer mill.

Mixing / Heating / Pressure Molding Method: The waste plastic raw material serving as a binder in this case is provided by two types of methods. One is to provide the collected waste plastic in the form of finely cut pieces or powder. In addition, various waste plastics are heated in a metal container, and the melted-to-solidified material is crushed or pulverized and provided as a binder. As the heat-press molding machine, a screw-type extruder of a single-screw or twin-screw system is mainly provided. The molding size and shape are
It is possible to cope with various differences such as a hollow body, a rod shape, and a large number of small-sized extrusion molding. All of these are requirements from the purpose of the steelmaking aid.

The raw aluminum ash and the powdery waste plastic are mixed at a mixing ratio designed in advance as a steelmaking aid, and premixed by a ribbon mixer or the like.
The mixed powder uniformly mixed is supplied in a fixed amount to a heating and pressing molding machine maintained at a constant temperature, and is extruded. The molding is smoothly performed by the processing heat accompanying the extrusion molding. At this time, the addition of a plasticizer such as a solid lubricant gives a function of further facilitating the molding process. Addition of a trace amount of vegetable waste oil having a high ignition temperature can also promote effective molding.

100-200 ° C. by heating and press molding machine
The molded article of the present invention extruded at a temperature of the above is cut into a predetermined length at the exit of the molding machine. The cutting length is determined by its role as a steelmaking auxiliary as described above. For the purpose of taking into account the molding efficiency and productivity, if the size of the steelmaking aid is small, it is possible to produce powdered and granular products through a crushing step after measuring large size molding.

A typical composition of a steelmaking auxiliary produced by the means of the present invention is shown below as an example. The range of the following composition varies depending on fluid factors such as a difference in a target treatment method and a difference in slag physical properties. Corresponding purpose A: For the purpose of suppressing and calming slag forming, Corresponding purpose B: For the purpose of slag slag making Corresponding purpose C: For the purpose of reforming and reducing slag Corresponding purpose D: Auxiliary energy and alumina supply source in steelmaking process Application in each case:

The present invention is a scheme of molding and solidification that draws out the characteristics of each waste. Aluminum ash is most effective as a copper-making auxiliary material because its solidification is measured by a method in which the reaction of AlN is suppressed, and the solidification that completely prevents the oxidation of fine powdered Me-Al contained in the aluminum ash. The value of Me-Al, which is an important element, can be provided for each purpose without deteriorating. In the practice of steelmaking aids, dealing with powdered materials is not a need at steelmaking sites today. According to the present invention, it is possible to arbitrarily cope with a required size in a refining process, so that a mechanization request for addition can be satisfied.

Hereinafter, a description will be given of a typical embodiment in the course of research. The heating and melting reaction container provided in the present invention has the following specifications. Diameter 400mmφ Container material Fe heating method Gas burner Stirring and mixing method Hand mixer Mixing of raw materials: Material of waste plastic for binder: Polypropylene waste plastic Mixing ratio (weight) = 25% Quality of mixed aluminum ash: Me-Al component amount = 25% Al ₂ O ₃ content = 48% Mixing ratio (weight) = 75% Test production amount: 2.5 kg

First, a waste plastic container is cut, put into a reaction container, and heated by a gas burner to measure melting. Fluidity increases over time. The temperature of the molten plastic in the container is 270 ° C
Then, separately prepared aluminum ash is added little by little. At the same time, mixing was performed to uniformly contact the molten plastic. The remaining calculated amount of aluminum ash was also continuously added, and after stirring and mixing, the heating was stopped and cooled and solidified in the reaction vessel.

Since the amount of aluminum ash was relatively large, crushing was extremely easy and easy. When the properties of aluminum ash were observed by processing each of the lump and powdered products, the bonding between the particles was satisfactory as a steelmaking auxiliary material. Me- of the solidified sample
When Al was analyzed, the value was almost equal to the Me-Al content in the raw material stage, confirming the proof of the present invention.

Next, an aluminum ash-based steelmaking aid using waste plastic as a binder, which was manufactured by the above-described invention method, was added to an actual steelmaking process, and the effect was confirmed. The following is an example.

Example of Addition to Ironmaking Process: Example 1 Addition of Slag Forming in Hot Metal Ladle (Torpedo Car) as an Additive as a Calming Material The aim is to reduce the process load of steelmaking and to eliminate problems from slag treatment. Hot metal pretreatment is an important high-grade steel refining process in recent years. Hot metal pretreatment starts with a Si removal operation. In the Si removal treatment, mill scale is mainly added as an oxygen source, and Si in the hot metal is subjected to an oxidation reaction of iron oxide. Generally, the Si removal treatment is represented by cast bed removal Si or inclined pouring ladle removal Si.

The de-Si reaction is carried out by the [%
C] is also accompanied by the addition of iron oxide. The de-C reaction involves the generation of CO gas. Unreacted mill scale remains active after removal to hot metal ladle
i, de-C, and some de-P reactions are sustained. The problem at this stage is in CO gas generation. Since the receiving of iron takes a long time, the surface of the coated slag in the ladle and in the torpedo car begins to partially solidify as the temperature decreases. The generated CO gas in the hot metal loses its spouting field and increases the pressure immediately below the slag. The balance between the gas pressure and the coated slag layer is lost, and a danger of injecting the molten slag from the pig iron receiving portion is created. The role of preventing this state is the forming suppressing / sedative material.

From such a background, the product of the present invention in which aluminum ash was solidified was added at the tip of the tapping gutter after the addition of the Si-removing material. The speed of addition at that time was 10 kg / 3 minutes, and a time period of about 30 minutes was used as a follow-up observation test. Naturally, it flowed into the pig iron ladle, and a vigorous boil reaction due to waste plastic as a binder material was observed.
On the other hand, Me-Al in aluminum ash which is a mixed material and
_Al 2 O in the coating slag by the action of the Al ₂ O ₃ component
₃ composition can be enriched, and the active gas boiling effect activates the reaction with the added Al ₂ O ₃ composition,
The early transition to the low melting point slag composition was measured, and the melting point of the slag was reduced due to the flux effect. The coated slag was activated and did not lead to an increase in gas pressure. It was possible to satisfy the initial setting of the amount of received pig iron without any problems.

Example for converter refining: 2 Example of use for the purpose of suppressing and calming slag forming in oxygen blowing The slag forming in oxygen blowing of the converter is performed in the case of the hot metal treatment described above. It is different from forming. During the refining, when the amount of dissolved oxygen in the molten steel or in the slag reaches an extremely high value, a slag boiling phenomenon suddenly appears. In addition to the refining slag, the boiling of the molten steel accompanies the outflow outside the furnace.

Under such circumstances, the addition of the product of the present invention was measured. The stock of the product of the present invention was measured at the furnace top, and the precursor of slag forming was observed along with the transition of oxygen blowing. From the observation of continuous addition of 20 kg / times × 2 times, it was confirmed that the slag forming was weakly weakened. , And the subsequent oxygen blowing could be completed without any end.

Example for Electric Furnace Steelmaking: 3 Use example for slag making and reduction refining at the beginning of the reduction refining period The main material of the slag forming material is CaO (quicklime). Under basic electric furnace operation, steel refining is not possible without CaO. However, CaO alone is a high melting point material as high as 2600 ° C., and is in the steelmaking refining temperature range of 15 ° C.
It has to go to the region from 00 to 1600 ° C. A flux represented by CaF ₂ plays this role. The CaF ₂ flux is an excellent and fast acting CaO.

On the other hand, CaF ₂ always has the problem of corrosion of refractories, despite its flux effect. Further, environmental problems and water pollution problems with respect to F alone or F compounds have been raised. An increase in environmental issues is an increase in the suppression of F compounds. Needless to wait for the regulation of CaF _2, it is where the voluntary use restriction is awaited.

A material that can be used as a substitute for the CaF ₂ flux is Al ₂ O ₃ . The addition of Al ₂ O ₃ was measured in steel metallurgy, and low melting point Al ₂ O ₃ was obtained by reaction with CaO.
It is a fact known from the results of previous studies that it is possible to produce compounds. The present invention provides an Al ₂ O ₃ composition during the slag making process as an alternative to CaF ₂ flux. Further, the present invention aims at improving the refining ability and improving the yield of the Fe-Si alloy by measuring the effective use of Me-Al contained in the aluminum ash.

The conditions used for implementing the product of the present invention were as follows. EAF electric furnace capacity 70 Ton Secondary refining furnace Same capacity LF refining furnace In-furnace CaO content 12 Kg / Molten steel Ton Addition amount of the product of the present invention 4 kg / Molten steel Ton (25% waste plastic blended product) Through normal melting and refining The molten steel measures the CaO-based slag after the slag. At that time, the addition of the product of the present invention was measured as a substitute for the flux, and the state of slag making was determined and the state of refining of the interfacial reaction between molten steel and slag was observed.

The information obtained from the results was as follows. 1) The steelmaking temperature at the time of slag was 1590 ° C., and thereafter, the process was shifted to continuous slag making and slag refining. CaO slagification was quick and did not differ from normal slag making. 2) When the product of the present invention was added, a slight observation of fume generation was observed. The generated fume did not cause any problem by suction into the dust collection system. 3) [% Si] = 0.03% is considered to be due to the action of Me-Al contained in the product of the present invention.
Seen by yield calculation. 4) The effect of desulfurization refining during tapping, which is a guide for refining, was calculated to increase the desulfurization capacity by about 10% compared to the refining level by the conventional method.

In this section, only the waste plastic binder effect of aluminum ash has been discussed, but as a steelmaking auxiliary material, its application to the following is also an important unit. 1) In steelmaking refining, the technique of refining harmful inclusions by low basicity slag refining is also becoming more and more active. In this case, it is also an effective means to use fly ash, natural wollastonite powder, or the like with the technology of the present invention to measure the production and supply it to a steelmaking site. 2) Steelmaking smelting slag material CaO reacts very actively to moisture and moisture in the atmosphere. Moisture absorption causes moisture in CaO to deteriorate the quality in steelmaking refining. In many cases, a great deal of cost is required for the control. In order to prevent moisture absorption of CaO, the technology of the present invention
The surface coating of O can also be measured. At this time, a binary system obtained by mixing CaO with other steelmaking materials, or
It can also be made into a ternary composite material.

3) As for the solidification of the fine carbon material, the use of the technology of the present invention makes it easy to convert it into an effective material for the steelmaking process. The amount of fine carbon is large due to air pollution measures. Carbon is a reducing / deoxidizing material and an energy material. The waste plastic binder of the present invention is also a material having high calories.
The bonding material of the two is an extremely promising energy material, and the electric furnace steel can be provided with the effect of reducing electric energy during the melting period by simultaneous charging with the charged iron scrap. A composite solidified material of carbon and aluminum ash that aims at the slag-making effect is also effective in the steelmaking process.

4) S, which is a steelmaking reducing material or a deoxidizing material,
The solidification of i-alloy powder, SiC powder, and Al powder according to the present invention is a technology that can ultimately contribute greatly to cost exploration from the viewpoint of effective utilization of materials or the improvement of yield. Further, for example, it is possible to combine with a different type of deoxidizing material such as a mixed solidification of Al and Si, and supply it to a steelmaking site. In other industries,
For example, metals that are disposed of as wastes, such as those found in Si fines, also open the way to becoming an effective material for steelmaking processes.

[0049]

The effects of the present invention described in this section have been described in detail in the embodiments and examples of the present invention, and the main points thereof will be described below. It will be described.

1. This is an invention technology that ensures the effective use of industrial waste or some general waste. It is an invention that provides a means of producing organic combined products of aluminum ash, which is an industrial waste product generated in the aluminum smelting and alloy industry, and recovered waste plastic, and that can make a great contribution to waste disposal. .

2. In the treatment of aluminum ash containing a large amount of AlN, generation and control of harmful ammonia gas is an unavoidable problem. The technology of the present invention can provide a solution to this major problem. If the problem of ammonia gas is cleared and solidified, it will open the way for effective use in other industrial fields, including steel smelting, which is not related to conventional dumping.

3. Plastic products, which are various chemically synthesized products, have been developed and supplied to the market in response to the demands of social lifestyles. Various plastic products are overflowing. Along with that, various discussions have been made on waste plastic treatment measures, but the mainstay is combustion treatment,
Or landfill. The fact is that what is being recycled is only a small amount due to various reasons. By taking advantage of the low melting point characteristics of the waste plastic that cannot be recycled, the technology of the present invention can open the way to effective utilization from disposal.

4. Various problems had to be solved for the effective use of aluminum ash for steel refining. Breakdown from powder and properties, problems related to ammonia gas generation, and Me-A, which is an effective element in steel refining
All the problems could be solved by the present invention using waste plastic as a binder. This is a technology that can be docked with the anhydrous and low melting point binder.

5. In the refining process of steelmaking, there is an urgent need to move away from pollution problems caused by fluorine compounds. The fluorine problem mainly comes from the problems of air pollution and water pollution. In particular, in the latter case, immediate action is required from the setting of regulation values of the soil (water quality) environmental standard. The biggest problem is that it concerns the basis of in-house generated slag treatment. Regulations on the use of fluorine equal and fluorite. As a substitute material for CaF ₂ flux, Al ₂ O
_Three materials are promising, and can reduce the melting point of CaO slag material. The technology of the present invention greatly contributes to making aluminum ash a high-grade product as the Al ₂ O ₃ material and supplying it in an inexpensive and easy-to-use state.

6. Furthermore, as a steelmaking refining material of wastes that were generated in other industries that had not been transferred in the past, and were in the form of fine powder and sludge,
This is an invention technology that can expand the range of utilization. For example, cutting fine powder generated when cutting single crystal (crystallized) Si in the semiconductor industry is an example of reuse in the steel refining process by measuring solidification according to the present invention. The technology of the present invention can be applied to various applications for effective use of resources.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B09B 3/00 301M 301F (72) Inventor Norihisa Miyaguchi 20-1 Kaminawawa Shinmachi, Noda City, Chiba Prefecture (72) Inventor Katsumi Numa 2-4-20 Minamitsubocho, Fukuyama City, Hiroshima Prefecture (72) Inventor Tsutomu Yoshida 3-14-1, Daimon, Fukuyama City, Hiroshima Prefecture F-term (reference) 4D004 AA07 AA37 AA43 AA44 BA05 CA04 CA15 CA22 CA29 CA32 CA45 CC17 4K001 AA02 BA12 BA13 DB36 4K063 AA01 BA13 CA02

Claims (2)

[Claims] 1. Production of a steelmaking auxiliary agent containing waste plastic or various kinds of plastics in a content of 1% or more and used as a binder when solidifying powdery or granular steelmaking materials. Steelmaking raw materials are mainly aluminum ash or aluminum ash composite products, but are not limited, and solidification of the following steelmaking materials is also within the scope of the claims. In the case of the present specification, the description is mainly composed of aluminum ash materials. Single-As raw materials: fly ash, various carbon powders,
Cutting powder of various materials, etc. Metallic materials, such as powdered metal Si or Si alloy, powdered metal Al or Al alloy, etc. As a mixture material: Silica + quicklime, aluminum ash + carbon powder, aluminum ash + quicklime, other composites, etc. Examples of plastics or various plastics include PET bottles, polyethylene, polypropylene, and polystyrene. Definition of aluminum ash: Classification extraction of aluminum from aluminum refining or secondary refining, or aluminum refining slag or aluminum dross generated during the aluminum alloy or master alloy melting and refining process, or the above-mentioned refining slag or aluminum dross Refers to the entire refining slag, such as the residue when it is discharged. 2. The practical use of a steelmaking auxiliary produced using waste plastics or various plastics as a binder in the ironmaking and steelmaking refining process is as follows. Use of slag as a suppressant for foaming and as a soothing material Use of slag as a modifier Use of slag as a production aid (use as a slag-making material) Use of slag as a reducing (= deoxidizing) reactant During the melting period Use as an auxiliary energy material