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Smelting process of recycling chromium by combined-injection dephosphorizing using stainless steel precipitator dust

A stainless steel and dephosphorization technology, applied in the field of smelting, can solve the problems such as the inability to effectively recover metal chromium and environmental pollution, and achieve the effect of reducing production costs and environmental pollution.

Active Publication Date: 2014-12-17
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Problems solved by technology

[0016] The purpose of the present invention is to provide a smelting process that utilizes stainless steel dedusting ash composite blowing dephosphorization to recover chromium, so as to solve the environmental pollution caused by improper handling of dedusting ash produced in stainless steel smelting, and the metal chromium contained therein cannot be processed. The problem of efficient recycling

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  • Smelting process of recycling chromium by combined-injection dephosphorizing using stainless steel precipitator dust

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[0051] The technical solutions and beneficial effects of the present invention will be described in further detail below.

[0052] A smelting process for recovering chromium by composite spraying and dephosphorization of stainless steel dust ash, which is characterized in that it includes the following steps:

[0053] Step 1. Passivation of stainless steel dust ash: the collected stainless steel dust ash is coarsely screened, and the moisture-absorbing and agglomerated particles are sealed and ground in a ball mill. The temperature in the ball mill is 80-100 ℃, which is added during the grinding process Silicone oil, the amount of silicone oil added is 1-15% of the total weight of the passivation powder to form an oil film on the surface of the stainless steel dust ash particles, and the particle size of the stainless steel dust ash after grinding is less than 100 μm;

[0054] Step 2: Loading: the passivated stainless steel dust removal ash prepared in step 1 is loaded into the powde...

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Abstract

The invention relates to the technical field of stainless steel smelting and discloses a smelting process of recycling chromium by combined-injection dephosphorizing using stainless steel precipitator dust. The process comprises the following main technical processes: coarsely screening the collected stainless steel precipitator dust; performing seal grinding, drying and passivating on moist caking particles with a ball mill ; feeding the passivated stainless steel precipitator dust and the passivated lime powder to two powder injection system stock bins; and injecting the powder by an injection pipeline of a smelting furnace into the molten steel within a steel ladle for combined-injection dephosphorizing of the molten steel pretreatment. The process can save or replace the dosage of solid materials like oxide scale, efficiently solve the problem of harmful treatment of the stainless steel precipitator dust, recycle chromium from the metal elements in the stainless steel precipitator dust to the molten steel for stainless steel smelting, realize recycling of chromium-containing stainless steel waste, and reduce the production cost. By using the method of the invention, the environment pollution is reduced and the aims of energy conservation and emission reduction are realized.

Description

Technical field [0001] The invention relates to the technical field of smelting, in particular to a smelting process for dephosphorizing and effectively recovering metallic chromium in stainless steel dust ash in a molten steel pretreatment process, which utilizes stainless steel dust ash composite spray dephosphorization to recover chromium. Background technique [0002] In the production process of iron and steel enterprises, a large amount of smoke and dust will be generated. After the smoke and dust are captured and collected by the dust removal device, dust removal ash is formed. At present, most of the dust removal ash recycling rate is low, especially the dust removal ash removed from the stainless steel plant, because it contains chromium, nickel and other substances, if improperly handled, it will cause great harm to the environment. In foreign countries, the treatment of nickel-containing stainless steel waste mainly includes In-metco process, STAR smelting reduction pr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B34/32
CPCY02P10/20
Inventor 秦俊山
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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