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Slag solidifying agent for AOD (argon oxygen decarburization) refining stainless steel smelting slag and preparation method and application thereof

A technology of argon-oxygen refining and slag coagulant, which is applied in the field of AOD argon-oxygen refining stainless steel smelting slag coagulant and its preparation, which can solve the problems of ineffective use of tailings, increased processing costs, and non-utilization of slag, reaching the price Low cost, reduced stacking cost, and reduced pollution

Active Publication Date: 2022-01-21
SINOSTEEL EQUIP & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AOD furnace smelting stainless steel will produce a large amount of steel slag. At present, the foreign stainless steel slag treatment adopts the hot pouring method. The steel slag picked up after smelting stainless steel is transported to a special steel slag treatment place, where it is hot poured, and water is continuously pumped to cool it. Steel slag is processed and precious metals are recovered to reduce the raw material consumption of stainless steel production, and the tailing slag is not effectively utilized
The domestic stainless steel enterprises in Qingshan and Baowu Taiyuan Iron and Steel all adopt the method of tap water and heat braising for stainless steel slag treatment. From α-C2S phase to γ-C2S phase, the volume expands, and after cooling, it becomes pulverized, and white dust is easily formed, which seriously pollutes the environment
At present, some manufacturers at home and abroad use the form of spraying boron magnesium ore, borax, etc. to control the pulverization of stainless steel slag during the cooling process. However, although this method is effective, it increases the processing cost, and the treated slag has no use value.

Method used

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  • Slag solidifying agent for AOD (argon oxygen decarburization) refining stainless steel smelting slag and preparation method and application thereof
  • Slag solidifying agent for AOD (argon oxygen decarburization) refining stainless steel smelting slag and preparation method and application thereof
  • Slag solidifying agent for AOD (argon oxygen decarburization) refining stainless steel smelting slag and preparation method and application thereof

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preparation example Construction

[0031] The present invention provides a method for preparing the AOD argon-oxygen refining stainless steel smelting slag coagulation agent described in the above technical solution, comprising:

[0032] Mix cryolite, binder and pearl sand to obtain a mixture;

[0033] The mixture is sequentially subjected to sheet rolling, crushing, sizing, and sieving to obtain an AOD argon-oxygen refining stainless steel smelting slag coagulation agent.

[0034] In the present invention, the cryolite is preferably industrial waste cryolite. In the present invention, the particle size of the cryolite is preferably <5 mm, more preferably 1-4 mm, most preferably 2-3 mm.

[0035] In the present invention, the binder is preferably sodium silicate, more preferably sodium silicate dry powder.

[0036] In the present invention, the particle size of the pearl sand is preferably <5 mm, more preferably 0.5-2 mm, most preferably 1-1.5 mm; the particle size of the pearl sand is preferably -100 mesh.

...

Embodiment 1

[0060] according to figure 1 In the shown process, industrial waste cryolite, sodium silicate dry powder and pearl sand are mixed to obtain a mixture;

[0061] The mixture is sequentially subjected to sheet rolling, crushing, sizing, and sieving to obtain an AOD argon-oxygen refining stainless steel smelting slag coagulation agent with a particle size of 0.5-2 mm.

[0062] The mass ratio of industrial waste cryolite and pearl sand (-100 mesh) is 20:80; the mass of sodium silicate dry powder is 1.5% of the mass of the mixture.

[0063] Using the GB / T14506 "Chemical Analysis Method for Silicate Rocks" standard, the AOD argon-oxygen refining stainless steel smelting slag coagulation agent prepared in Example 1 of the present invention is tested for composition, and the test result is: SiO 2 : 58.46wt%; Al 2 o 3 : 9.95wt%; Fe 2 o 3 : 2.17wt%; CaO: 0.69wt%; K 2 O: 2.03wt%; Na 2 O: 3.65wt%; MgO: 0.24wt%; H 2 O: 3.54wt%; NaF 9.47wt%; AlF 3 8.52wt%; CaF 2 1.06wt%; MgF 2 ...

Embodiment 2

[0066] according to figure 1 In the shown process, industrial waste cryolite, sodium silicate dry powder and pearl sand are mixed to obtain a mixture;

[0067] The mixture is sequentially subjected to sheet rolling, crushing, sizing, and sieving to obtain an AOD argon-oxygen refining stainless steel smelting slag coagulation agent with a particle size of 0.5-2 mm.

[0068] The mass ratio of industrial waste cryolite and pearl sand (-100 mesh) is 30:70; the mass of sodium silicate dry powder is 1.5% of the mass of the mixture.

[0069] According to the method of Example 1, the composition of the AOD argon oxygen refining stainless steel smelting slag coagulant prepared in Example 2 of the present invention is detected, and the test result is: SiO 2 : 51.15wt%; Al 2 o 3 : 8.83wt%; Fe 2 o 3 : 2.23wt%; CaO: 0.6wt%; K 2 O: 1.78wt%; Na 2 O: 3.2wt%; MgO: 0.21wt%; H 2 O: 3.1wt%; NaF 14.2wt%; AlF 3 12.77wt%; CaF 2 1.59wt%; MgF 2 0.34 wt%.

[0070] Add 1 / 3 of the slag coag...

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Abstract

The invention provides a slag solidifying agent for solidification treatment of slag generated in AOD refining. Required raw materials comprise 60-80 wt% of pearl sand, 20-40 wt% of industrial waste cryolite and 0-1.5 wt% of an additional binder sodium silicate dry powder, and the required raw materials need to be crushed to below 5 mm, then mixed and stirred in proportion, pressed into strips by granulation equipment and then crushed into 0.5-3 mm finished products. The slag solidifying agent product can change the original phase change expansion characteristic of the AOD slag and avoid expansion and pulverization after condensation, compared with blowing of borax, the treatment cost is greatly reduced, the treated slag can be used for building material cement, secondary pollution is avoided, and land occupation is avoided. The invention further provides a preparation method and application of the slag solidifying agent for the AOD refining stainless steel smelting slag.

Description

technical field [0001] The invention belongs to the technical field of stainless steel smelting, and in particular relates to an AOD argon-oxygen refining stainless steel smelting slag coagulant and its preparation method and application. Background technique [0002] The main function of AOD argon-oxygen refining furnace for smelting stainless steel is to dilute the partial pressure of CO gas in the furnace through argon gas, so that it can decarburize to a very low level without oxidizing chromium at a lower temperature. The AOD smelting method has the advantages of wide selection of raw materials, high decarburization efficiency, low smelting cost, less chromium oxidation, strong stirring force and high thermal efficiency of molten steel, and easy computer automatic control of the blowing process. It has become the main process of stainless steel smelting. AOD furnace smelting stainless steel will produce a large amount of steel slag. At present, foreign stainless steel s...

Claims

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Application Information

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IPC IPC(8): C21C7/076
CPCC21C7/076Y02P10/20
Inventor 程立王振林金锋
Owner SINOSTEEL EQUIP & ENG
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