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Method and system for harmlessly recycling and treating stainless steel dedusting ash

A technology of recycling and processing system, which is applied in the field of harmless recycling and processing of stainless steel dust removal, can solve environmental pollution and other problems, and achieve the effect of solving environmental pollution and reducing steelmaking production costs

Active Publication Date: 2021-12-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method and system for harmless recovery and treatment of stainless steel dust, which can effectively restore Cr in stainless steel dust. 3+ and Cr 6+ , recover the metal elements in the dust, and solve the environmental pollution caused by the stainless steel dust

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  • Method and system for harmlessly recycling and treating stainless steel dedusting ash

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Embodiment 1

[0049] The present invention is applied to recycle and process stainless steel dedusting ash on 80 t TSR furnace, and smelt 410S stainless steel. Dephosphorized molten iron is used as the smelting raw material. The initial carbon content of the molten pool is 3.2%, and the blowing method is bottom blowing. The specific smelting process is as follows:

[0050] (1) The calculation system receives the steel type and the carbon content signal of the molten pool, and determines the premixing ratio of stainless steel dust, carbon powder and lime powder as follows: 25% stainless steel dust, 45% carbon powder, and 30% lime pink;

[0051] (2) According to the 410S stainless steel smelting process and product characteristics, the calculation system calculates that the weight of the dust-removing ash mixture that needs to be added for production is 1.8 t, that is, the required stainless steel dust-removing ash is 0.45 t, carbon powder is 0.81 t, and lime powder is 0.54 t. The injection s...

Embodiment 2

[0057] The present invention is applied to the 150 t AOD furnace to recycle and process stainless steel dedusting dust to smelt 430 stainless steel. The stainless steel mother liquor is used as the smelting raw material. The initial carbon content of the molten pool is 1.8%. The blowing method adopts bottom blowing. The specific smelting process is as follows:

[0058] (1) The calculation system receives the steel type and the carbon content signal of the molten pool, and determines the premixed ratio of stainless steel dust, carbon powder and lime powder as follows: 20% stainless steel dust, 55% carbon powder, and 25% lime pink;

[0059] (2) According to the 410S stainless steel smelting process and product characteristics, the calculation system calculates that the weight of the dust-removing ash mixture required for production is 4.0 t, that is, the required stainless steel dust-removing ash is 0.8 t, carbon powder is 2.2 t, and lime powder is 1.0 t. The injection speed of ...

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Abstract

The invention provides a method and a system for harmlessly recycling and treating stainless steel dedusting ash, and belongs to the technical field of metallurgical solid waste recovery and treatment. The method comprises the following steps: collecting, grinding and passivating stainless steel dedusting ash, and premixing the stainless steel dedusting ash with carbon powder and lime powder according to a specific ratio so as to improve the jet flow property and reactivity of the stainless steel dedusting ash; and spraying a pre-mixed dedusting ash mixed material into a smelting furnace, and completely reducing Fe < 2 + >, Fe < 3 + >, Cr < 3 + > and Cr < 6 + > in the stainless steel dedusting ash in a molten pool so as to achieve the purpose of harmless treatment of the stainless steel dedusting ash and efficiently recover Fe, Cr and other metal elements in the stainless steel dedusting ash. The whole treatment process does not make contact with the external environment, the problem of environmental pollution caused by the stainless steel dedusting ash is thoroughly solved, and meanwhile the steelmaking production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgical solid waste recovery and treatment, in particular to a method and system for harmless recovery and treatment of stainless steel dust removal. Background technique [0002] During the production process of stainless steel, a certain amount of smoke and dust will be generated and collected by various dust removal equipment to form stainless steel dust removal ash. Stainless steel dust contains a lot of Fe 2+ , Fe 3+ , Cr 3+ and Cr 6+ , these high-valent metal elements, especially Cr 6+ , In the process of accumulation, it can cause poisonous effect on surrounding animals and plants through air transmission and groundwater leaching, endangering human health and causing serious pollution to the environment. However, Cr and Fe elements, as an important component in stainless steel products, have high recovery value. 3+ and Cr 6+ Effective recycling can not only reduce the environmental pro...

Claims

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Application Information

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IPC IPC(8): C21B3/04C21C5/00C21C7/00
CPCC21B3/04C21C5/00C21C7/00C21B2100/44C21C2200/00Y02P10/20Y02W30/50
Inventor 魏光升周赟朱荣董凯陈培敦赵刚薛志涛薛波涛殷齐敏王俊海王春阳任鑫
Owner UNIV OF SCI & TECH BEIJING