CN204982009U - Reclaiming of stainless steel slag utilizes device - Google Patents

Abstract

The utility model discloses a recycling device for stainless steel slag, which comprises: steel slag cooling equipment, which is used for spraying water to cool the stainless steel slag according to the type of stainless steel slag, so that the stainless steel slag can be fully digested, powdered and broken; Sorting, sieving, crushing, magnetic separation, rod milling and gravity separation are carried out on the stainless steel slag after heat-stewing and pulverization treatment, so as to separate the slag steel containing nickel, chromium and iron from the stainless steel slag. The tailings processing equipment is used to process the tailings sorted and sorted into building materials or dry briquettes for export. The stainless steel slag recovery and recycling device proposed by the utility model realizes the recovery of the stainless steel slag and has strong compatibility.

Description

Stainless steel slag recovery and recycling device

technical field

The utility model relates to the technical field of steel slag recovery equipment, in particular to a stainless steel slag recovery and recycling device.

Background technique

According to relevant statistics from the Stainless Steel Branch of the China Special Steel Enterprises Association, China's crude stainless steel production in 2014 was 21.692 million tons, an increase of 2.708 million tons or 14.27% over 2013, accounting for about half of the global total stainless steel production.

Steel slag is an inevitable product in the stainless steel smelting process. In my country, according to the different production levels of various steel factories, 40-90kg of steel slag will be produced for every ton of stainless steel smelted. Calculated according to this ratio, the output of stainless steel slag in my country in 2014 was about 2 million tons.

Stainless steel slag contains a large amount of valuable metals such as nickel, chromium, and iron. If it is not treated, this part of iron-containing resources will be lost in vain; Insufficient, it needs to spend a huge amount of money to import from the Philippines, Indonesia and other places every year. In addition, stainless steel slag contains Cr ⁶⁺ toxic compounds. If not treated, the discharged tailings will also cause serious harm to the surrounding environment, destroy the structure of soil vegetation, and pollute the air and water.

At present, there are only a few companies in the world that have patented technologies for effective treatment and reasonable recycling of stainless steel slag, but most of these companies obtain economic benefits while retaining their patents in the form of joint ventures or sole proprietorships; most domestic stainless steel slag is artificially processed The outdated method of sorting large pieces of slag steel and tailings for waste storage, most of the valuable metals nickel, chromium, and iron remain in the slag, and cannot be recycled in time, resulting in waste of resources. The amount of dust in the treatment process is large, which pollutes the surrounding environment. At the same time, due to the incomplete treatment of steel slag, it cannot be effectively used and harmlessly treated.

The stainless steel slag in foreign developed countries (the United States, Japan, Germany, etc.) has already achieved a balance in discharge and use, but the comprehensive utilization rate of steel slag in my country is only about 20%, and the comprehensive utilization rate is very low.

Utility model content

The main purpose of the utility model is to provide a recycling device for stainless steel slag, which aims at recycling stainless steel slag and has strong compatibility.

To achieve the above purpose, the utility model provides a recycling device for stainless steel slag, including:

Steel slag cooling equipment is used to spray water to cool the stainless steel slag according to the type, so that the stainless steel slag can be fully digested, pulverized and broken;

Steel slag processing equipment is used for sorting, screening, crushing, magnetic separation, rod milling and gravity separation of stainless steel slag after thermal powderization treatment, so as to separate slag steel containing nickel, chromium and iron from stainless steel slag out.

The tailings processing equipment is used to process the tailings sorted and sorted into building materials or dry briquettes for export.

Preferably, the steel slag processing equipment includes a vibrating screen for screening the cooled stainless steel slag, a crusher for crushing the screened stainless steel slag, and a crusher for crushing the crushed stainless steel slag. Air separator for dry air selection, rod mill for grinding crushed stainless steel slag, jig for jigging screening for ground stainless steel slag, and jigging machine for jigging A classifier for classifying the screened stainless steel slag. The vibrating screen, crusher, winnowing machine, rod mill, jig and classifier are sequentially connected by a conveying device.

Preferably, the stainless steel slag recovery and recycling device also includes a first magnetic separator for magnetic separation with the tailings screened out of the vibrating screen through a conveying device, and a second magnetic separator connected to the classifier through a conveying device , and a pulverizer connected with the wind separator through a conveying device to grind the tailings separated by wind.

Preferably, the classifier is a spiral classifier.

Preferably, the tailings processing equipment includes a filter press and a dryer.

Compared with the existing technology, the stainless steel slag recovery and recycling device proposed by the utility model has the following advantages:

1. With this device, the powdering of steel slag, the separation of slag and steel, and the reuse of tailing slag are completed in a set of continuous process flow, which saves the traditional process of stockpiling, reversing and other processes, so the equipment occupies an area of Small;

2. Steel slag treatment equipment includes crushing equipment, screening equipment, dry treatment equipment, wet treatment equipment, magnetic separation treatment equipment, winnowing treatment equipment, water treatment equipment, etc. Different types of stainless steel slag can be completed in this set of equipment For recycling, it only needs to selectively short-circuit or close some equipment in the device. The device has strong compatibility and no repeated investment;

3. With this device, the valuable metals in steel slag can be recovered to the greatest extent, and the added value of tailing slag is also greatly improved.

Description of drawings

Fig. 1 is the schematic flow sheet of the preferred embodiment of the utility model stainless steel slag recycling device;

Fig. 2 is a process flow diagram of the utility model stainless steel slag recovery and recycling device during implementation.

In the figure, 10-vibrating screen, 20-crusher, 30-wind separator, 40-rod mill, 50-jigging machine, 60-classifier, 71-filter press, 72-dryer, 81- The first magnetic separator, 82-the second magnetic separator, 83-the pulverizer.

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Referring to Fig. 1, Fig. 1 is a schematic flow diagram of a preferred embodiment of the stainless steel slag recovery and recycling device of the present invention.

In this preferred embodiment, a recycling device for stainless steel slag includes:

Steel slag cooling equipment is used to spray water to cool the stainless steel slag according to the type, so that the stainless steel slag can be fully digested, pulverized and broken;

Steel slag processing equipment is used for sorting, screening, crushing, magnetic separation, rod milling and gravity separation of stainless steel slag after thermal powderization treatment, so as to separate slag steel containing nickel, chromium and iron from stainless steel slag out.

The tailings processing equipment is used to process the tailings sorted and sorted into building materials or dry briquettes for export.

Specifically, the steel slag processing equipment includes a vibrating screen 10 for screening the cooled stainless steel slag, a crusher 20 for crushing the screened stainless steel slag, and a crusher 20 for crushing the crushed stainless steel slag. Air separator 30 for dry air selection, rod mill 40 for grinding the crushed stainless steel slag, jig 50 for jigging and screening the ground stainless steel slag, and The classifier 60 that classifies the stainless steel slag screened out by the jig 50, the vibrating screen 10, the crusher 20, the winnowing machine 30, the rod mill 40, the jig 50 and the classifier 60 are sequentially connected by a transmission device. The classifier 60 is a spiral classifier. The tailings processing equipment includes a filter press 71 and a dryer 72 .

Further, the stainless steel slag recovery and recycling device also includes a first magnetic separator 81 for magnetically separating the tailings screened out from the vibrating screen 10 through a conveying device, and a second magnetic separator 81 connected with the classifier 60 through a conveying device. A sorting machine 82, and a pulverizer 83 connected with the winnowing machine 30 through a conveying device to grind the tailings separated by wind.

When this stainless steel slag recovery and recycling device is in use, the following methods are adopted: according to the type of stainless steel slag, it is sprayed with water to cool it, so that the stainless steel slag is fully digested, pulverized and broken; Steel slag processing and recycling line, through the steel slag processing and recycling line, it is sorted, screened, crushed, magnetically separated, rod milled and gravity separated to separate slag steel containing nickel, chromium and iron from stainless steel slag; it will pass through The graded and sorted tailings are processed into building materials or briquettes and dried for export.

The oxidized slag produced by the pretreatment of molten iron is scraped into the slag pot by the slag scraper during the treatment process. The slag contains little metal and the slag is relatively hard. The metal recycling value is not high and can be directly used in other fields. . For the steel slag produced by EAF electric furnace, AOD converter and LF refining furnace, due to slag dumping operation and large ladle casting waste, etc., it contains more stainless steel metal, so this part of slag must be recycled and utilized.

When the stainless steel slag is EAF electric furnace slag, the stainless steel slag is sprayed and soaked for cooling, and the cooling time and the flow rate of spray cooling water are determined according to the amount of slag contained in the slag tank, so that the hot slag is directly soaked in water, and the cooling is accelerated. After cooling to a certain temperature, it is transported to the slag dumping area and dumped into the designated slag bin according to different types, and the dumped steel slag is subjected to pretreatment operations such as slag and steel primary selection;

When the stainless steel slag is AOD converter slag, it is processed by hot-simmering process to control the amount of water drawn during the hot-simmering process to ensure that most of the cooling water is evaporated, so as to ensure that the dry processing equipment (including rod mill 40, jig 50 And grader 60) antegrade;

When the stainless steel slag is ladle casting slag, the slag tank partition and water spray cooling method are used for treatment.

During the transportation of steel slag and slag dumping operation, the steel slag is always kept in a wet state, thereby minimizing the environmental pollution caused by flying dust.

When the stainless steel slag is AOD converter slag, the stainless steel slag is sieved, and the large particles screened out are ground and classified by wet processing equipment (that is, through a sorting machine), and the part under the screen is ground and classified by dry processing equipment ;

When the stainless steel slag is EAF electric furnace steel slag, the stainless steel slag is abrasive and classified by wet treatment process.

According to the type, stainless steel slag can be divided into 400 series ferritic steel slag, 300 series austenitic steel slag, 200 series austenitic steel slag; according to the different smelting process, it can be divided into converter (AOD) steel slag and electric furnace (EAF) steel slag Wait. Among them, 200-series and 400-series stainless steel slags are magnetic, and 300-series stainless steel slags are non-magnetic; converter steel slag is pulverized into powder after natural cooling, and electric furnace steel slag is digested into lumps or granules after cooling with water. 200-series and 400-series stainless steel slags are magnetic, and 300-series stainless steel slags are non-magnetic. Therefore, 200-series and 400-series stainless steel slags can be selected by magnetic separation.

In this embodiment, the processed stainless steel slag is recycled using the process shown in Figure 2, the residual metal in the tailing slag is ≤0.8%, the metal recovery purity is ≥85%, and the produced slag steel can be returned to the steelmaking workshop for use.

After being finely ground by the pulverizer 83, the winnowed tailings produced by the dry treatment process have a specific surface area ≥ 420m ² /kg, and can be directly used in cement plants without any processing, and can be added as raw materials for cement. Other types of tailings can be used as construction sand, concrete ingredients, etc.

With reference to Fig. 2, take the stainless steel slag as the EAF electric furnace steel slag as an example to specifically illustrate the specific process of the stainless steel slag recycling method: first, the stainless steel slag hot slag is sprayed and soaked for cooling, and the cooling time is determined according to the amount of slag contained in the slag tank and the flow rate of spray cooling water, so that the hot slag is directly soaked in water to accelerate cooling; after the slag is cooled to a certain temperature, it is transported to the slag dumping area and dumped into the designated slag box according to different types, and the dumped steel slag is dumped Carry out pretreatment operations such as slag and steel primary sorting. During the primary sorting process, the steel slag above 450mm is crushed with a hydraulic breaker and then put into the silo, and the steel slag between 0 and 450mm is stored in the silo; The conveyor transports the steel slag in the silo to the vibrating screen, the vibrating screen screens out 0~10mm steel slag and transports it to the magnetic separator for magnetic separation, and the 10~80mm steel slag is transported to the crusher (inertia cone crusher in this example) ), the steel slag larger than 80mm is crushed by the jaw crusher and transported to the steel slag yard; the inertial cone crusher crushes the steel slag of 10~80mm to less than 30mm, and the 0~6mm tail is sorted through the sorting of the wind separator The slag is transported to the pulverizer, and the steel slag of 6~30mm is sorted through the action of the wet rod mill, jig machine and spiral classifier in turn, and finally filtered by the filter press, and the tailing slag is dried by the dryer. into mud cakes.

Compared with the existing technology, the stainless steel slag recovery and recycling device proposed in this embodiment has the following advantages:

1. With this device, the powdering of steel slag, the separation of slag and steel, and the reuse of tailing slag are completed in a set of continuous process flow, which saves the traditional process of stockpiling, reversing and other processes, so the equipment occupies an area of Small;

2. Steel slag treatment equipment includes crushing equipment, screening equipment, dry treatment equipment, wet treatment equipment, magnetic separation treatment equipment, winnowing treatment equipment, water treatment equipment, etc. Different types of stainless steel slag can be completed in this set of equipment For recycling, it only needs to selectively short-circuit or close some equipment in the device. The device has strong compatibility and no repeated investment;

3. With this device, the valuable metals in steel slag can be recovered to the greatest extent, and the added value of tailing slag is also greatly improved.

The above are only preferred embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. All equivalent structural transformations made by using the description of the utility model and the contents of the accompanying drawings are directly or indirectly used in other related technical fields. All are included in the scope of patent protection of the utility model in the same way.

Claims (5)

1. a stainless steel slag recovery and reusing and recycling device, is characterized in that, comprising:

Slag cooling apparatus, carries out water-spraying control process for the type according to stainless steel slag to it, makes stainless steel slag fully clear up efflorescence and fragmentation;

Slag processing equipment, carry out sorting for the stainless steel slag after heat is boiled in a covered pot over a slow fire efflorescence process, sieve, fragmentation, magnetic separation, rod milling and gravitational segregation, so that the slag steel of nickeliferous in stainless steel slag, chromium, iron is selected;

Tailings processing units, dries for outward transport for the tailings by assortment being processed into building material product or briquetting.

2. stainless steel slag recovery and reusing and recycling device as claimed in claim 1, it is characterized in that, described slag processing equipment comprises the vibratory screening apparatus for sieving cooled stainless steel slag, for carrying out the crusher of break process to the stainless steel slag after screening, for carrying out the winnowing machine of dry type selection by winnowing to the stainless steel slag after break process, for the rod mill ground the stainless steel slag after break process, for carrying out the jig of jig screening to the stainless steel slag after grinding, and the stainless steel slag for being selected by jigging screen carries out the grading machine of classification, described vibratory screening apparatus, crusher, winnowing machine, rod mill, jig and grading machine are connected successively by transport unit.

3. stainless steel slag recovery and reusing and recycling device as claimed in claim 2, it is characterized in that, also comprise and sift out the first magnetic separator that tailings carries out magnetic separation, the second magnetic separator be connected with described grading machine by transport unit by transport unit and described vibratory screening apparatus, and the pulverizer carrying out grinding with the mine tailing its selection by winnowing gone out be connected with described winnowing machine by transport unit.

4. stainless steel slag recovery and reusing and recycling device as claimed in claim 2, it is characterized in that, described grading machine is screw classifier.

5. as the stainless steel slag recovery and reusing and recycling device in Claims 1-4 as described in any one, it is characterized in that, described tailings processing units comprises pressure filter and dryer.