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Preparation method and use method of slag condensing agent for molten iron pretreatment

A technology of hot metal pretreatment and slag coagulation agent, which is applied in the field of iron and steel metallurgy, can solve the problems of incomplete slag removal, unclean slag removal, and increased burden, so as to avoid converter sulfur return, reduce production cost, and reduce sulfur return rate. Effect

Active Publication Date: 2020-04-10
新疆华宇新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the hot metal pre-desulfurization process, the sulfur content in the molten iron slag after desulfurization accounts for more than 30% of the total sulfur content in the converter, the less thorough the slag removal, the higher the sulfur content in the slag
In the desulfurization and slag removal process, after desulfurization with single-spray granular magnesium, the amount of slag is small and thin, and the slag removal is not clean and difficult to remove. The slag with high MgS enrichment is mixed into the converter, and the sulfur returns to the steel. Adds a burden to the next process of converter steelmaking
[0003] Aluminum ash and red mud are mainly used for stockpiling, which not only occupies land, seriously endangers the ecological environment, but also causes waste of secondary resources
At present, there are many studies on the safe disposal and resource utilization of aluminum ash and red mud, but they are all independent technologies for aluminum ash or red mud, and the two hazardous / solid wastes have not been co-processed and utilized, and the research involved is in the laboratory. In the research and development stage, there is a lack of systematic application engineering

Method used

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preparation example Construction

[0024] A method for preparing a coagulant agent for molten iron pretreatment, comprising the steps of:

[0025] Step 1: Dry aluminum ash and Bayer process red mud at 150°C for 24 hours respectively, and set aside;

[0026] In step 2, the aluminum ash and Bayer red mud after the drying treatment in step 1 are respectively taken for subsequent use. The amounts of aluminum ash and Bayer red mud are respectively 50-55% of aluminum ash and 45-50% of Bayer red mud according to weight percentage. mud;

[0027] Step 3, put the raw materials taken in Step 2 into a three-dimensional mixer and mix for 12 hours, mix evenly, and set aside;

[0028] Step 4, pulverize the mixed material and transfer it to an environment with a temperature of 1400-1600°C for melting, then cool to room temperature and crush it, and get the slag coagulant for pretreatment of molten iron after being taken out of the furnace.

[0029] The main components of the aluminum ash are: Al 2 o 3 65~70%, AlN 18~22%, ...

Embodiment

[0032] Embodiment: When using the slag forming agent prepared by the present invention for the pretreatment desulfurization of molten iron, in the process of spraying 0.5 kg granular magnesium per ton of molten iron for desulfurization, add 0.2 kg of slag forming agent per ton of molten iron; , continue to add the slag coagulant in 4 batches, so that the slag coagulant is scattered on the surface of the molten iron, the amount of each batch is 35 kg, and the total amount of the slag coagulant added is controlled at 1.2 kg per ton of molten iron.

[0033] After adding slag coagulant, SiO2-A1 can be quickly formed on the surface of molten iron 2 o 3 -Fe 2 o 3 Slag system, the slag system has the function of adjusting the basicity and fluidity of slag, and is helpful for the adsorption of inclusions inside the molten steel. In addition, the slag system can also absorb magnesium sulfide and dissolve into the slag, and increase the cohesion of the slag, promote the separation of...

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PUM

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Abstract

The invention relates to a preparation method and use method of a slag condensing agent for molten iron pretreatment. During preparation of the slag condensing agent, the slag condensing agent is prepared from Bayer-process red mud and aluminum ash as main raw materials through steps of baking, mixing, smelting and the like. During use of the slag condensing agent, the prepared slag condensing agent is added during and after blowing of particular magnesium, so that the slag condensing agent rapidly forms a SiO2-Al2O3-Fe2O3 slag system on the surface of molten iron, the basicity and fluidity ofslag are adjusted, the slag condensation performance is improved, slag-iron separation is promoted, the slag is easier to be removed thoroughly, temperature drop is reduced, and resulfurization of aconverter is avoided.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for preparing and using a slag coagulation agent for pretreatment of molten iron. Background technique [0002] The hot metal pre-desulfurization process is a desulfurization treatment technology before the molten iron enters the steelmaking furnace. It is the first mature desulfurization process outside the furnace in the hot metal pretreatment technology. Now it has developed into an indispensable and important link in the steel production process. The application of hot metal pretreatment technology can effectively reduce the desulfurization burden of the blast furnace, remove the desulfurization link in the steelmaking process, and achieve the goal of energy saving and emission reduction to achieve high quality and high production. But in the hot metal pre-desulfurization process, the sulfur content in the molten iron slag after desulfurization a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02
CPCC21C1/025C21C7/0645
Inventor 刘海涛张威风王维黄运红李玉芝
Owner 新疆华宇新材料有限公司