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Converter steelmaking process by blowing CO2 gas

A converter steelmaking and CO2 technology, applied in the manufacture of converters, etc., can solve the problems of large iron loss, energy consumption, and high oxygen oxidation intensity

Inactive Publication Date: 2005-09-07
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

However, due to the high oxidation strength of oxygen, the iron loss caused by oxygen blowing is relatively large, and oxygen production requires energy consumption, which increases production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] 1. 80 tons of converter smelting process, using CO 2 -O 2 Mixed blowing, using the top blowing method, with a spray gun.

[0010] Slagging stage: CO 2 -O 2 CO in the mixed gas 2 The concentration is 30%, O 2 The concentration is 70%. After the spray gun is lowered to the slag melting position, according to the condition of the slag in the furnace, the CO 2 -O 2 Blow time. The mixed gas flow rate is 16000-23000Nm 3 / h, the pressure is 0.4-1.6Mpa.

[0011] Decarburization heating stage: After the slag removal task is completed, the spray gun is lowered to the decarburization position, CO 2 -O 2 CO in the mixed gas 2 The concentration is 10%, O 2 The concentration is 90%, the mixed gas flow rate is 16000-23000Nm 3 / h, the decarburization time is determined according to the carbon content of the molten pool in the furnace, and the tapping temperature and steel composition are reached.

[0012] 2. 300-ton converter smelting process: CO 2 The supersonic spray ...

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Abstract

A converting process that jets carbon dioxide, belonging to ferrous metallurgy field. The process takes oxygen and carbon dioxide or the mixed gas with oxygen and carbon dioxide as gas source, the injection quantity of gas is 1000-120000Nm3 / h, the pressure is 0.4-1.6MPa.The process can make use of carbon dioxide recovered and treated from waste gas that generated by various industrial furnace, and also can exploit natural carbon dioxide as gas source. It suits for steel that the carbon content is 0.01-1.30% in the smelting steel. By using carbon dioxide instead of oxygen, it decreases the burning loss of iron and other metal element during the smelting process, which deducing the production cost and the consumption of oxygen, and therefore plays a positive part in alleviating the green house effect and has a dramatic social benefit.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, in particular to a converter steelmaking and blowing process. Background technique [0002] The traditional converter steelmaking process generally uses oxygen as a smelting method for various elements in the steelmaking iron oxide liquid to achieve the purpose of adjusting the smelting composition, removing harmful substances, and smelting molten steel with a qualified temperature. However, due to the high oxidation strength of oxygen, the iron loss caused by oxygen blowing is relatively large, and oxygen production requires energy consumption, which increases production costs. Contents of the invention [0003] The purpose of the present invention is to find a gas that can replace oxygen to smelt molten steel, reduce the burning loss of iron and other metal elements in the smelting process, reduce production costs, and at the same time not affect the quality of smelted molten steel. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/072
Inventor 朱荣仇永全薛立秋张贵梁立新高峰
Owner UNIV OF SCI & TECH BEIJING
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