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Method for reducing dust of steel mill by using CO2

A technology of CO2 and gas, which is applied in the field of environmental protection, energy saving and emission reduction of iron and steel metallurgy, and can solve the problems of increasing the dust removal load of steelmaking, increasing the amount of smoke and dust, reducing the metal yield, etc.

Active Publication Date: 2008-08-27
UNIV OF SCI & TECH BEIJING
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AI Technical Summary

Problems solved by technology

The increase of smoke and dust not only reduces the metal yield but also increases the dust removal load of steelmaking

Method used

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Embodiment Construction

[0009] (1) 100-ton converter smelting process, carbon dioxide and oxygen are passed through a device using 1-5% CO 2 Injection mixed with oxygen, within 0-5 minutes of smelting (first period): CO 2 -O 2 CO in the mixed gas 2 The concentration is 4%, O 2 The concentration is 96%. According to the condition of the slag in the furnace, the CO 2 blowing time. The mixed gas flow rate is 18000-20000Nm 3 / h, the pressure is 0.6-1.0Mpa.

[0010] Decarburization stage (second period): 5-9 minutes, after the slag removal task is completed, CO 2 -O 2 CO in the mixed gas 2 The concentration is 1%, O 2 The concentration is 99%, the mixed gas flow rate is 20000-23000Nm 3 / h, the decarburization time is determined according to the carbon content of the molten pool in the furnace.

[0011] Heating stage (third period): After 9-13 minutes, 7% carbon dioxide and 93% oxygen are mixed and injected, and the flow rate of the mixed gas is 23000-25000Nm 3 / h, according to the oxidation of...

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Abstract

The invention belongs to the ferrous metallurgy and environmental protection field, relating to a treatment for offscum, which comprises a converter steelmaking and electric furnace steelmaking technology. The traditional treatment process in current offscum is recycled after dust removal and dust collection, which is a post treatment process. The invention aims to provide a novel process which can reduce dust generation in steelmaking process, and reduces the burning loss of iron and other melt elements in the smelting process. The process comprises mixing a little amount of CO2 gas into oxygen jet flow, reducing the temperature of the flash points region of a molten pool when the mixed gas jet flow is sprayed on the molten pool, controlling the evaporation of iron when the temperature of flash points region is decreased under 2750 DEG C, and reducing dust discharge in steelmaking smelting process, wherein the CO2 content in the mixed gas is controlled within 1-9%, and the content of oxygen is 99-91%. The process is suitable to the technology for the converter steelmaking of 30-300 ton and electric furnace steelmaking of 30-200 ton. The evaporation amount of iron is reduced about 30-70% through adopting the process, and the iron loss which is caused by dust is reduced 5-10kg / t.

Description

technical field [0001] The invention belongs to the fields of energy saving, emission reduction and environmental protection of iron and steel metallurgy, and mainly relates to the generation and emission of smoke and dust in the steelmaking production process. Background technique [0002] Oxygen is usually used as an oxidant in the steelmaking process to complete decarburization and dephosphorization reactions, to achieve tasks such as raising the temperature of the molten pool and removing inclusions. Since the oxygen jet directly contacts the molten pool, a high temperature fire point area above 3000°C is generated. The boiling point of metallic iron is 2750°C, so iron will evaporate and oxidize, forming smoke and dust that will be discharged with high-temperature flue gas. At present, in the steelmaking production process, each ton of steel will produce 1-2% of the amount of smoke and dust, about 10-20kg. The increase of smoke and dust not only reduces the metal yield...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C5/52
CPCY02P10/20
Inventor 朱荣尹振江董凯仇永全易操王慧霞
Owner UNIV OF SCI & TECH BEIJING
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