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Novel direct slag-feeding washing mixed material application method in converter tapping process

A technology of straight-up slag washing and mixing materials, applied in the direction of improving process efficiency, can solve the problems of inability to remove gas, high operating cost, huge investment, etc., to reduce the refining burden, shorten the refining time, and reduce the breakout rate.

Inactive Publication Date: 2013-08-07
涟源市飞达冶金炉料厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, slag washing cannot remove the gas in molten steel, and when the slagging material is not dry, it may increase hydrogen in molten steel
Its huge investment and high operating costs have also brought great obstacles to improving the competitiveness of the company's marketing department.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

[0037] The example conclusion is as follows:

[0038] (1) The slag and slag system of the molten steel after the new type of direct slag washing mixed material slag washing has changed greatly, the slag basicity has dropped from 2.49 to 1.70, and the ω(Al 2 o 3 ) increased by 80% and the viscosity was moderate, and the ω (FeO) in the slag decreased by 28%, which created favorable thermodynamic and kinetic conditions for desulfurization of refining slag.

[0039] (2) The use of the new type of direct slag washing mixed material slag washing process reduces the amount of refining slagging material and shortens the arc heating slag time. After adding the new type of direct slag washing mixed material, the refining time is shortened by nearly 4 minutes on average, and finally the CSP production line is more Furnace continuous pouring provides reasonable production conditions.

[0040] (3) After the new type of direct slag washing mixed material slag washing, the desulfurization ...

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Abstract

The invention relates to a novel direct slag-feeding washing mixed material application method in a converter tapping process. A mixed material comprises the following components in parts by weight: 5-40 parts of aluminium powder, 35-60 parts of alumina, 30-50 parts of calcined lime, 1-6 parts of magnesium oxide, 0-6 parts of fluorite and 5-6 parts of silicon dioxide powder. The application method is used in a tapping process according to the following steps: firstly, adding 30% of the novel direct slag-feeding washing mixed material into the bottom of a steel ladle; adding the rest 70% of the material and the calcined lime along with molten steel flow when 1 / 4 tapping is completed; and moreover, feeding the mixed material into an argon blowing station, blowing argon to stir for 10-15 minutes, and then directly and continuously casting blanks so as to form finished products. The slag washing mixed material has high desulfurization degree in the converter tapping process, the refining time can be effectively shortened, and the cost of each ton of steel can be greatly lowered.

Description

technical field [0001] The invention relates to a method of using slag washing material for converter tapping. Background technique [0002] With the development of science and technology, people have higher and higher requirements for the variety and quality of steel products. In order to meet this demand in the society, the production process of steel has undergone tremendous changes and progress. Especially in order to improve the quality and purity of steel, various refining devices outside the furnace have been widely used in recent years, such as RH, CAS-OB, LF furnaces, etc. Of course, the application of these equipments has played an important role in reducing the content of various non-metallic inclusions in steel and the change of inclusion types, especially in the production of special pure steel. [0003] The slag washing process has a good desulfurization effect, and can quickly form slag to shorten the smelting time. However, slag washing cannot remove the g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21C7/072
CPCY02P10/20
Inventor 杨新顺
Owner 涟源市飞达冶金炉料厂
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