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Method for reducing solvent consumption under slag remaining condition of converter

A converter and condition technology, used in the manufacture of converters, improvement of process efficiency, etc., can solve the problems of loss, intense process, and low tapping temperature of converter

Active Publication Date: 2015-03-04
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Slightly careless slag operation can easily cause large splashing accidents
However, when the raw dolomite is completely used under the condition of leaving slag, a large amount of heat will be released during decomposition, and the process is relatively intense. If the timing is not grasped properly, the metal material in the converter will be splashed and a large amount of loss will be caused, and the converter will explode in severe cases. cause a major accident
At the same time, when raw dolomite decomposes, it will absorb a large amount of heat, and the cooling effect is far superior to that of ordinary coolants. When the addition of raw dolomite to the converter is not good, it is easy to cause the temperature of the converter to be too low, resulting in quality accidents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] When smelting steel grade Q345C (B1), the method of reducing solvent consumption under the condition of slag retention in the converter includes the following steps in sequence:

[0017] 1) Before the converter operation, prepare two silos in the converter area. The fluorite and magnesium ball silos can be used as raw dolomite and limestone silos, one as raw dolomite silos and one as limestone silos ; For raw materials, the content of MgO in raw dolomite is ≥13%, and the content of CaO in limestone is ≥60%.

[0018] 2) Q345C (B1) belongs to aluminum killed steel. The raw dolomite addition amount is 11kg / ton steel, and the limestone addition amount is 7kg / ton steel; after adding raw dolomite, the addition amount of light burnt dolomite is correspondingly reduced, and the reduction is the amount added One third of the weight of dolomite; after limestone is added, the amount of active lime added to the converter is correspondingly reduced, and the reduction is one-half of the w...

Embodiment 2

[0030] When smelting steel grade Q235B(H), the method of reducing solvent consumption under the condition of slag retention in the converter includes the following steps in sequence:

[0031] 1) Before the converter operation, prepare two silos in the converter area. The fluorite and magnesium ball silos can be used as raw dolomite and limestone silos, one as raw dolomite silos and one as limestone silos ; For raw materials, the content of MgO in raw dolomite is ≥13%, and the content of CaO in limestone is ≥60%.

[0032] 2) Q235B(H) belongs to aluminum killed steel, raw dolomite is added at 10kg / ton steel, and limestone is added at 5kg / ton steel;

[0033] 3) During the smelting process, limestone can only be added before and before the start of blowing, and it is required to be added at one time with the first batch of active lime. The raw dolomite is added at the earliest when the blowing is on, and the latest is when the slag is dumped. When adding, it requires one-time addition a...

Embodiment 3

[0044] When smelting steel grade SS330, the method of reducing solvent consumption under the condition of slag retention in the converter includes the following steps in sequence:

[0045] 1) Before the converter operation, prepare two silos in the converter area. The fluorite and magnesium ball silos can be used as raw dolomite and limestone silos, one as raw dolomite silos and one as limestone silos ; For raw materials, the content of MgO in raw dolomite is ≥13%, and the content of CaO in limestone is ≥60%.

[0046] 2) The steel grade SS330 belongs to aluminum killed steel, the raw dolomite addition is 10kg / ton steel, and the limestone addition is 5kg / ton steel;

[0047] 3) During the smelting process, limestone can only be added before and before the start of blowing, and it is required to be added at one time with the first batch of active lime. The raw dolomite is added at the earliest when the blowing is on, and the latest is when the slag is dumped. When adding, it requires o...

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PUM

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Abstract

The invention discloses a method for reducing solvent consumption under a slag remaining condition of a converter. The method comprises the following steps of (1) preparing two bins in a converter region before converter operation, wherein one of the bins is used as a raw dolomite bin, and the other bin is used as a limestone bin; (2) confirming the addition amount of the converter according to steel type and molten iron conditions, wherein the addition amount of raw dolomite in every ton of aluminum killed steel is less than or equal to 12kg, the addition amount of limestone in every ton of aluminum killed steel is less than or equal to 10kg, the addition amount of the raw dolomite in every ton of other kinds of silicon killed steel is less than or equal to 10kg, and the addition amount of the limestone in every ton of other kinds of silicon killed steel is less than or equal to 8kg; (3) adding the limestone along with the first batch of active lime at one step before beginning to blow in the smelting process; and adding the raw dolomite at one step when beginning to blow to the deslagging period; (4) sampling no slag specimen in first converter slag remaining operation during converter pouring for sampling once the blowing oxygen of the converter is up to 750S; and (5) keeping the tapping temperature at 1660-1700 DEG C during tapping. By using the method, the waste steel consumption of the converter can be effectively reduced, so that the cost of a converter solvent is reduced.

Description

Technical field [0001] The invention belongs to the technical field of converter steelmaking, and specifically refers to a method for reducing solvent consumption under the condition of slag retention in the converter. Background technique [0002] In order to further reduce costs in steel production, lower cost limestone and raw dolomite can be used to replace active lime and light-burned dolomite respectively. As limestone and raw dolomite, they are characterized by a carbonate structure. Decomposition occurs, and calcium oxide and magnesium oxide are formed after decomposition to form the basis of slag. [0003] The slag retention method of the converter is to add a certain amount of flux during the slag splashing of the previous furnace, and add scrap and iron normally after splashing dry, and finally add the flux according to the 20% reduction of the flux of the furnace without slag. When it reaches 30%, when converter slag is generated, pour the slag once. Slightly careless...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/36
CPCY02P10/20
Inventor 陈俊孚杨成威李丽坤曹同友曹锟孙伟张剑君彭著钢庞建飞
Owner 武汉钢铁有限公司
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