EP2768988A2 - Agent de désulfuration contenant du bitume, procede de fabrication et son utilisation - Google Patents

Agent de désulfuration contenant du bitume, procede de fabrication et son utilisation

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Publication number
EP2768988A2
EP2768988A2 EP12775252.5A EP12775252A EP2768988A2 EP 2768988 A2 EP2768988 A2 EP 2768988A2 EP 12775252 A EP12775252 A EP 12775252A EP 2768988 A2 EP2768988 A2 EP 2768988A2
Authority
EP
European Patent Office
Prior art keywords
weight
bitumen
calcium
particularly preferably
calcium oxide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12775252.5A
Other languages
German (de)
English (en)
Other versions
EP2768988B1 (fr
Inventor
Frank HERWIG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Almamet GmbH
Original Assignee
Almamet GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C21C1/025—Agents used for dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/02—General features in the manufacture of pig-iron by applying additives, e.g. fluxing agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C21C7/0645—Agents used for dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C21C2007/0062—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires with introduction of alloying or treating agents under a compacted form different from a wire, e.g. briquette, pellet
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2250/00—Specific additives; Means for adding material different from burners or lances

Definitions

  • the present invention relates to an agent for the desulfurization and / or desulfurization, in particular of pig iron melts or steel melts, to a process for the production of such an agent and to the use of such an agent for the desulfurization and / or pre-desulfurization of a pig iron melt or molten steel.
  • pig iron For the production of pig iron, a mixture of iron ore and coke, which functions both as an energy carrier and as a reducing agent for the iron ore, is usually reduced to pig iron in a blast furnace. Due to the comparatively high sulfur content of coke, comparatively high amounts of sulfur are absorbed in the process
  • desulphurisation agents For the removal of sulfur from pig iron and / or steel, a large number of desulphurisation agents have been proposed, which, for example, are introduced pneumatically or mechanically into the molten pig iron or molten steel and there reduce the sulfur to a sulphide compound, such as, for example, calcium sulphide the pig iron melt rises and thus gets into the slag, with which she later removed from the pig iron.
  • a sulphide compound such as, for example, calcium sulphide
  • the reducing agent for desulfurization for example, magnesium, magnesium alloys, soda, quick lime and calcium carbide are known.
  • DE 22 52 796 C3 discloses a desulfurizing agent which, in addition to calcium carbide or calcium cyanamide as the reducing agent, contains a solid, hydrogen-containing compound, such as polyethylene or polyamide.
  • EP 0 226 994 B1 discloses a desulphurising agent which contains calcium carbide and dried coal.
  • desulfurizing agents are disadvantageous for hot metal desulfurization.
  • soda decomposes explosively when introduced into the pig iron, resulting in increased wear of the components involved.
  • the achievable with soda desulfurization are unsatisfactory low.
  • soda reacts with sulfur endothermally, so that temperature losses occur in the pig iron.
  • the levels of desulfurization achievable with magnesium and magnesium alloys as desulfurizing agents are limited, among other things due to the fact that the solubility of magnesium increases with increasing temperature of the pig iron and with decreasing sulfur content in the pig iron.
  • desulfurization agents based on calcium compounds are primarily used for desulphurizing pig iron melts and / or steel melts.
  • calcium carbide has the highest specific efficiency in desulfurization, i. with a predetermined amount of calcium carbide a higher by about a factor of 2 desulfurization of a pig iron melt is achieved than with the same amounts of calcium oxide.
  • Calcium carbide reacts with water to form acetylene which, like all low molecular weight hydrocarbons, forms highly flammable mixtures with air. For this reason, the transport and storage of calcium carbide are complicated and costly.
  • desulphurization of pig iron melts or steel melts based on calcium oxide with a high desulphurisation efficiency would be desirable.
  • the object of the present invention is therefore to provide a desulfurizing agent based on calcium oxide, which has a high specific activity in the desulfurization of a molten pig iron or molten steel.
  • this object is achieved by a means for desulfurization and / or Vorentschwefelung particular of pig iron melts or steel melts, which contains calcium oxide and bitumen.
  • This solution is based on the surprising finding that the addition of bitumen to calcium oxide significantly increases the efficacy of calcium oxide in the desulfurization and / or desulfurization of a molten pig iron or molten steel, compared to the same mixture without added bitumen, depending on the respective different, factory-specific physical, chemical and technological conditions up to the desulphurisation performance of calcium carbide. It is of particular advantage that the added bitumen does not impair the blowing behavior of the desulfurizing agent into the pig iron melt or at least not significantly.
  • bitumen is stable under air, not self-igniting and not reactive with water, which is why bitumen is not subject to any transport restrictions or storage restrictions.
  • the desulfurization agent according to the invention thus has the advantages of calcium oxide while avoiding the disadvantages of the known from the prior art desulfurization.
  • Bitumen is a mixture of high-molecular-weight hydrocarbons, which occurs both naturally and can be produced, for example, by vacuum distillation from crude oil. Bitumen is the most volatile and non-dense petroleum fractions which are not affected by vacuum distillation. Bitumen is a dispersion in which carbon-rich particles, the so-called asphaltenes, as well as resins in an oily matrix, whose constituents are referred to as maltenes, are colloidally dissolved.
  • the Maltenes are predominantly aromatic hydrocarbons, cycloalkanes, alkanes and alkenes having a weight average molecular weight of 500 to 1,500 g / mol, whereas the asphaltenes are of aromatic hydrocarbons and heterocyclic Compounds with a comparatively high molecular weight exist.
  • bitumen is understood to mean all of the corresponding compositions defined in DIN EN 12597, ie in particular asphalts - ie mixtures of bitumen and aggregates - and all fractions which are produced by any separation technique from bitumen and / or asphalt have been obtained.
  • bitumen can be any natural or synthetic bitumen produced, for example, from crude oil, regardless of whether it is in solid, pulpy or liquid form.
  • those mentioned are selected from the group consisting of road bitumen, hard road bitumen, soft bitumen, modified bitumen, distillation bitumen, high vacuum bitumen, polymer modified bitumen, specialty bitumen, industrial bitumen, oxidized bitumen, hard bitumen, blended bitumen, cold bitumen , fumed bitumen, flux bitumen, natural asphalt and any mixtures of two or more of the aforementioned compounds, wherein the individual terms are again meant in the meaning specified in DIN EN 12597 meaning.
  • the present invention is not limited in the amount of bitumen contained in the desulfurizing agent.
  • the desulfurizing agent according to the invention may contain from 0.1 to 20% by weight of bitumen.
  • the amount of bitumen contained in the desulfurizing agent is preferably from 1 to 10% by weight, more preferably 2 to 6 wt .-% and most preferably 2 to 4 wt .-%.
  • the calcium oxide contained in the desulfurization agent according to the invention acts as a reducing agent for the sulfur contained in the pig iron melt or molten steel.
  • the desulfurizing agent may contain, in addition to the calcium oxide, other reducing agents, in particular based on another calcium compound.
  • the desulphurising agent contains a mixture of two or more calcium compounds, this mixture, which is also referred to herein as a calcium component, preferably at least 20% by weight of calcium oxide and the balance to 100% by weight or more compounds selected from the group consisting of calcium hydroxide, calcium carbonate, calcium carbide and any mixtures of two or more of the aforementioned compounds.
  • the amount of calcium carbide contained in the desulfurizing agent is as low as possible or the desulfurizing agent particularly preferably contains no calcium carbide at all, ie the desulfurizing agent is a mixture of two or more contains more calcium compounds, said mixture containing at least 20 wt .-% calcium oxide and balance to 100 wt .-% calcium hydroxide and / or calcium carbonate.
  • the calcium component or the mixture of calcium compounds of the desulfurizing agent according to the invention to at least 50 wt .-%, preferably at least 75 wt .-%, particularly preferably at least 90 wt .-%, especially preferably at least 95% by weight and completely more preferably at least 99% by weight is composed of calcium oxide.
  • the desulfurizing agent contains calcium oxide as the sole calcium compound.
  • calcium oxide a calcium oxide produced in all manners can be used, such as, for example, soft lime, medium lime and hard lime, with good results, in particular with soft lime.
  • the present invention is not limited in terms of the amount of calcium oxide in the desulfurizing agent according to the invention.
  • good results are obtained especially when the desulfurizing agent 80 to 99.9 wt .-%, preferably 84 to 98 wt .-%, particularly preferably 90 to 97 wt .-% and most preferably 94 to 96 wt .-% calcium oxide or a mixture containing at least 20 wt .-%, preferably at least 50 wt .-%, particularly preferably at least 75 wt .-%, particularly preferably at least 90 wt .-%, most preferably at least 95 wt .-% and most preferably at least 99% by weight of calcium oxide and the balance to 100% by weight of one or more compounds selected from the group consisting of calcium hydroxide, calcium carbonate, calcium carbide and any mixtures of two or more of the aforementioned compounds.
  • the desulfurization component especially if it is designed for coinjection, preferably contains no other conventionally used for reductive injection. tion of sulfur compound used, in particular no magnesium, no magnesium alloy and no soda.
  • the desulphurising agent is to be introduced by monoinjection into the melt to be treated, in an alternative embodiment this may contain magnesium and / or a magnesium alloy, in particular a magnesium aluminum alloy. In this embodiment, it is preferable that the desulfurizing agent contains 1 to 15% by weight and preferably 6 to 12% by weight of magnesium and / or a magnesium alloy, preferably a magnesium aluminum alloy.
  • the magnesium and / or magnesium alloy contained in the desulfurizing agent preferably a magnesium aluminum alloy
  • the desulfurizing agent in this embodiment therefore contains from 1 to 15% by weight and very particularly preferably from 6 to 12
  • the desulfurization agent according to the invention preferably contains a flow agent to increase the flow behavior of the per se less flowable calcium oxide.
  • a flow agent to increase the flow behavior of the per se less flowable calcium oxide.
  • flow agents it is possible to use all compounds known to the person skilled in the art for this purpose, good results being obtained in particular with polyhydric alcohols and silicone oils.
  • polyhydric alcohols and silicone oils In addition or alternatively can be used as superplasticizer and flame coals.
  • particularly suitable polyhydric alcohols are in particular glycols
  • examples of particularly suitable silicone oils are organopolysiloxanes, in particular polymethylhydrogensiloxanes.
  • the desulfurizing agent according to the invention preferably contains between 0.01 and 10% by weight and more preferably between 0.05 and 5% by weight of one or more flow agents. Particularly preferably, the desulfurizing agent according to the invention contains between 0.05 and 0.5% by weight, more preferably between 0.05 and 0.2% by weight, very preferably between 0.075 and 0.112% by weight and most preferably about 0, 1 wt .-% of one or more flow agents. If used as a superplasticizer
  • the amount of flame coal is preferably 4 to 8 wt .-% based on the total weight of the desulfurizing agent.
  • the desulfurizing agent according to the invention may contain one or more additives.
  • the desulfurizing agent contains at least one additive selected from the group consisting of cryolite, sodium borate, fluorspar, and any mixtures of two or more of the above compounds.
  • the amount of additives contained in the desulfurizing agent is preferably from 0.5 to 8% by weight, more preferably from 0.5 to 4
  • Wt .-% and most preferably 0.5 to 2 wt .-%.
  • the desulfurizing agent is composed or consists of: 0, 1 to 20 wt .-%, preferably 1 to 10 wt .-%, particularly preferably 2 to 6 wt .-% and most preferably 2 to 4 wt .-% bitumen,
  • a flow agent selected from the group consisting of polyhydric alcohols, flame coals and silicone oils and any mixtures thereof, preferably selected from the group consisting of glycols, organopolysiloxanes and any mixtures thereof, and particularly preferably a polymethylhydrogensiloxane .
  • wt .-% preferably 0.5 to 8 wt .-%, particularly preferably 0.5 to 4 wt .-% and particularly preferably 0.5 to 2 wt .-% additive selected from the group consisting of cryolite , Sodium borate, fluorspar and any mixtures of two or more of the above compounds and
  • the desulphurising agent is composed or consists of: i) from 2 to 4% by weight of bitumen,
  • a flow agent selected from the group consisting of glycols, polymethylhydrogensiloxanes and any mixtures thereof,
  • the desulphurising agent is composed or consists of: i) from 2 to 3% by weight of bitumen,
  • a flow agent selected from the group consisting of glycols, flame coal and any mixtures thereof,
  • the desulfurizing agent has a flowability of at least 40 cm, preferably at least 45 cm, more preferably at least 55 cm, most preferably at least 60 cm, and most preferably at least 65 cm.
  • the fluidity in an air conveyor trough is determined as follows: A pneumatic trough consisting of an air box with a gas-permeable fabric, the fabric having a width of 0.1 m and a length of 1.5 m, and the fabric through a Blower with a defined volume flow of 20 m 3 / h of air is ventilated from below.
  • the desulfurizing agent according to the invention be in the form of a mixture, preferably in the form of a homogeneous mixture.
  • At least the calcium oxide contained in the desulfurizing agent according to the invention has such a particle size distribution. At least 80% by weight of the calcium oxide has a particle size of less than 32 ⁇ m, at least 85% by weight of the calcium oxide has a particle size of less than 45 ⁇ m, and at least 90% by weight of the calcium oxide has a particle size of less have at least 95% by weight of the calcium oxide and a grain size of less than 90 ⁇ m.
  • all constituents of the desulphurisation agent except for the magnesium and / or magnesium alloy contained therein, have a projecting particle size distribution, ie one in which at least 80% by weight of the components have a particle size of less than 32 ⁇ m, at least 85% by weight. % of the components have a particle size of less than 45 ⁇ m, at least 90% by weight of the components have a particle size of less than 63 ⁇ m and at least 95% by weight of the components have a particle size of less than 90 ⁇ m.
  • all components of the desulfurizing agent have such a particle size distribution, i. at least 80% by weight of the desulphurising agent have a particle size of less than 32 ⁇ m, at least 85% by weight of the desulphurising agent have a particle size of less than 45 ⁇ m, at least 90% by weight of the desulphurising agent have a particle size of less than 63 ⁇ m and at least 95% by weight of the desulphurizer have a particle size of less than 90 ⁇ m.
  • the desulfurizing agent in the form of one or more briquettes and preferably one or more pillow-shaped briquettes on.
  • the briquette or briquettes preferably have a cross section a size (length x width) of 10 x 5 to 200 x 100 mm, preferably from 25 x 15 mm to 75 x 50 mm and more preferably from 40 x 20 to 50 x 30 mm, such as 45 x 25 mm, on.
  • a briquetted desulfurizing agent is characterized by a particularly high desulfurizing effect for a pig iron melt.
  • such a briquetting desulfurizing agent surprisingly significantly reduces the total oxygen content of slag, which is why it is particularly suitable for slag conditioning and pre-desulfurization of pig iron.
  • the briquetted desulfurizing agent contains bitumen, calcium oxide, optionally a further calcium compound and optionally one or more additives, wherein the above compounds are preferably selected from the aforementioned groups and are contained in the amounts described above.
  • the briquetting desulfurizing agent consists of bitumen, calcium oxide, optionally one or more further calcium compound and optionally one or more additives, wherein the above
  • the desulfurizing agent according to this embodiment contains no other ingredients than those mentioned above, and especially no flow agent and also no magnesium or a magnesium alloy.
  • the briquetting desulfurizing agent according to this embodiment is particularly suitable for slag conditioning.
  • the briquetting desulfurizing agent is composed of: i) 0.1 to 20% by weight, preferably 1 to 10% by weight, particularly preferably 2 to 6% by weight and very particularly preferably 2 to 4% by weight of bitumen,
  • wt .-% 0 to 10 wt .-%, preferably 0.5 to 8 wt .-%, particularly preferably 0.5 to 4 wt .-% and particularly preferably 0.5 to 2 wt .-% additive selected from the group consisting from cryolite, sodium borate, fluorspar and any mixtures of two or more of the above compounds and
  • Another object of the present invention is a process for preparing a previously described means for desulfurization, in particular of pig iron melts or molten steel, comprising the following steps: a) mixing i) calcium oxide, ii) bitumen, iii) optionally at least one flow agent, iv ) optionally at least one further additive and v) one or more calcium compounds selected from the group consisting of calcium hydroxide, calcium carbonate, calcium carbide and any mixtures of two or more of the aforementioned compounds and Crushing the mixture obtained in step a) into powders having a particle size distribution wherein at least 80% by weight of the powder has a particle size of less than 32 ⁇ m, at least 85% by weight of the powder has a particle size of less than 45 ⁇ m at least 90% by weight of the powder have a particle size of less than 63 ⁇ m and at least 95% by weight of the powder have a particle size of less than 90 ⁇ m.
  • the starting materials i. i) calcium oxide, ii) bitumen, iii) optionally at least one flow agent, iv) optionally at least one further additive and v) one or more calcium compounds selected from the group consisting of calcium hydroxide, calcium carbonate, calcium carbide and any mixtures of two or more more of the aforementioned compounds, used with a particle size of not more than 20 mm and then mixed together.
  • process step b) it is proposed in process step b) to grind the mixture obtained in process step a) to powder having a fineness of 90 R 5 and preferably to powder with a grain size distribution, wherein at least 80 wt .-% of the powder Grain size of less than 32 ⁇ m, at least 85% by weight of the powder have a particle size of less than 45 ⁇ m, at least 90% by weight of the powder have a particle size of less than 63 ⁇ m and at least 95% by weight of the powder have a grain size of less than 90 ⁇ m.
  • the desulphurising agent to be produced additionally contains magnesium and / or a magnesium alloy, it is preferred not to add this in process step a) but to add it to the already ground mixture after process step b).
  • the reason for this is that, as stated above, at least the calcium oxide contained in the desulfurizing agent is to be ground to a comparatively small grain size, namely one having a particle size distribution wherein at least 80% by weight of the calcium oxide has a particle size of less than 32 to have.
  • a small grain size is not advantageous for the magnesium or magnesium alloy optionally contained in the desulfurizing agent because it would give an explosive atmosphere during grinding.
  • the optional magnesium and / or the optional magnesium alloy only after process step b), as particulate magnesium and / or particulate magnesium alloy, wherein at least 99% of all particles have a diameter of at least 30 ⁇ m, preferably from 30 to 200 ⁇ m, and more preferably from 50 to 200 ⁇ m.
  • the process produces a mixture which consists of: i) 0.1 to 20% by weight, preferably 1 to 10% by weight, more preferably 2 to 6% by weight and most preferably 2 to 4 Weight percent bitumen, ii) 0.01 to 10 wt .-%, preferably 0.05 to 0.5 wt .-%, particularly preferably 0.05 to 0.2 wt .-%, most preferably 0.075 to 0, 125 wt.
  • a flow agent selected from the group consisting of polyhydric alcohols, flame coals and silicone oils and any mixtures thereof, preferably selected from the group consisting of glycols, organopolysiloxanes and any mixtures thereof and more preferably a polymethylhydrogensiloxane,
  • iii) 0 to 15% by weight, preferably 1 to 15% by weight and more preferably 6 to 12% by weight of magnesium and / or a magnesium alloy,
  • wt .-% 0 to 10 wt .-%, preferably 0.5 to 8 wt .-%, particularly preferably 0.5 to 4 wt .-% and particularly preferably 0.5 to 2 wt .-% additive selected from the group consisting from cryolite, sodium borate, fluorspar and any mixtures of two or more of the above compounds and
  • the present invention relates to the use of the previously described agent for the desulfurization and / or desulfurization and / or slag conditioning of a pig iron melt or a molten steel.
  • the desulfurizing agent is introduced into the pig iron melt or molten steel by a dip lance method using transport gas, preferably argon or nitrogen, or by a stirring method, preferably in an amount of 2 to 5 kg per ton of pig iron melt or molten steel.
  • the agent in the form of one or more briquettes and add it to the molten pig iron or molten steel.
  • a mixture was prepared by mixing:
  • Wt .-% of the powder had a particle size of less than 32 microns
  • 87.9 wt .-% of the powder had a particle size of less than 45 microns
  • 90, 1 wt .-% of the powder had a particle size of less than 63 - and 95
  • 12% by weight of the powder had a grain size of less than 90 ⁇ m.
  • the desulfurizing agent thus obtained was injected by multi-injection dipping lance method, based on the lime-bitumen-containing mixture involved, in an amount of 1.1 kg / t pig iron.
  • the injection rates of the other substances involved in the multi-injection process remained constant, 350 ppm sulfur was removed from the pig iron melt.
  • a desulfurizing agent was prepared as described in the example, except that it contained no bitumen.
  • cryolite additive

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Lubricants (AREA)

Abstract

L'invention concerne un agent de désulfuration contenant du bitume et/ou de pré-désulfuration, notamment de fontes de fer brut ou de fontes d'acier, contenant de l'oxyde de calcium et du bitume.
EP12775252.5A 2011-10-20 2012-10-19 Agent de désulfuration contenant du bitume, procede de fabrication et son utilisation Active EP2768988B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011116501.4A DE102011116501C5 (de) 2011-10-20 2011-10-20 Bitumen enthaltendes Entschwefelungsmittel
PCT/EP2012/070776 WO2013057262A2 (fr) 2011-10-20 2012-10-19 Agent de désulfuration contenant du bitume

Publications (2)

Publication Number Publication Date
EP2768988A2 true EP2768988A2 (fr) 2014-08-27
EP2768988B1 EP2768988B1 (fr) 2016-02-03

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EP12775252.5A Active EP2768988B1 (fr) 2011-10-20 2012-10-19 Agent de désulfuration contenant du bitume, procede de fabrication et son utilisation

Country Status (7)

Country Link
US (2) US20150027274A1 (fr)
EP (1) EP2768988B1 (fr)
JP (1) JP6059728B2 (fr)
DE (1) DE102011116501C5 (fr)
RU (1) RU2610987C2 (fr)
WO (1) WO2013057262A2 (fr)
ZA (1) ZA201402576B (fr)

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JP6737161B2 (ja) * 2016-12-12 2020-08-05 日本製鉄株式会社 気流搬送方法及び製鋼の精錬方法
CN114729410A (zh) * 2019-09-30 2022-07-08 阳普尔有限公司 在坎巴拉反应器(kr)中进行热金属脱硫的方法
TWI814460B (zh) * 2022-06-27 2023-09-01 國立中興大學 塊狀脫硫劑的製備方法

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DE102011116501B4 (de) 2013-07-04
DE102011116501A1 (de) 2013-04-25
US10190183B2 (en) 2019-01-29
WO2013057262A2 (fr) 2013-04-25
ZA201402576B (en) 2016-02-24
DE102011116501C5 (de) 2018-05-24
RU2610987C2 (ru) 2017-02-17
JP2014530959A (ja) 2014-11-20
US20150027274A1 (en) 2015-01-29
EP2768988B1 (fr) 2016-02-03
US20170218469A1 (en) 2017-08-03
JP6059728B2 (ja) 2017-01-11
RU2014120186A (ru) 2015-11-27
WO2013057262A3 (fr) 2013-08-15

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