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Composite injecting molten iron desulphurizing agent and desulphurizing technology thereof

A technology of hot metal desulfurization and desulfurization agent, which is applied in the field of metallurgy, can solve the problems of insufficient reaction between desulfurizer and molten iron, insufficient stirring kinetic conditions, and unstable desulfurization effect, so as to improve the utilization rate and desulfurization rate of desulfurizer. The effect of high consumption and reduced floating speed

Inactive Publication Date: 2019-01-01
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

The existing combined injection desulfurization mainly has the following problems: 1) Since the magnesium bubbles formed after entering the molten iron have a large diameter and a fast floating speed, the utilization rate is low, resulting in high consumption of magnesium; 2) injection desulfurization and stirring Compared with desulfurization, the stirring kinetic conditions are insufficient, and the reaction between desulfurizer and molten iron is not sufficient, resulting in low desulfurization rate; 3) The desulfurization effect is unstable, and the problem of poor desulfurization effect is prone to occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) The molten iron tank is put into the desulfurization position, the molten iron load is 150t, the temperature is measured and sampled, the initial temperature is 1332°C, and the initial sulfur content is 0.032%;

[0024] 2) Start desulfurization, blow desulfurizer into the molten iron tank, set the injection speed to passivated magnesium 6kg / min, lime 30kg / min, limestone 12kg / min, actual injection speed passivated magnesium 6.2kg / min, lime 32kg / min, limestone 11.5kg / min; the diameter of passivated magnesium particles is 0.8mm, the particle size of lime is 200 mesh, and the particle size of limestone is 400 mesh; the average injection pressure of passivated magnesium particles is 370kpa, and the average injection pressure of lime is 420kpa. The average injection pressure of limestone is 420kpa; the insertion depth of spray gun is 2.5m;

[0025] 3) The injection time is 6 minutes and 15 seconds, and the desulfurization is completed.

[0026] 4) Temperature measurement...

Embodiment 2

[0028] 1) The molten iron tank is put into the desulfurization position, the molten iron loading capacity is 148t, the temperature is measured and sampled, the initial temperature is 1346°C, and the initial sulfur content is 0.030%;

[0029] 2) Start desulfurization, blow desulfurizer into the molten iron tank, set the injection speed to passivated magnesium 6kg / min, lime 30kg / min, limestone 12kg / min, actual injection speed passivated magnesium 6.1kg / min, lime 29kg / min, limestone 12kg / min; the diameter of passivated magnesium particles is 0.6mm, the particle size of lime is 300 mesh, and the particle size of limestone is 400 mesh; the average injection pressure of passivated magnesium particles is 380kpa, and the average injection pressure of lime is 420kpa. The average injection pressure of limestone is 430kpa; the insertion depth of spray gun is 2.3m;

[0030] 3) The injection time is 6 minutes, and the desulfurization is completed.

[0031] 4) Temperature measurement and ...

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Abstract

The invention discloses a composite injecting molten iron desulphurizing agent and a desulphurizing technology thereof. The desulphurizing agent is prepared from passivated magnesium, lime and limestone with the mass ratio being 1 to (2-8) to (1-4); the diameter of passivated magnesium particles is 0.1-0.6 mm; the granularity of the lime is 200-300 meshes; and the granularity of the limestone is 300-400 meshes. The desulphurizing technology comprises the following steps of blowing the passivated magnesium, lime and limestone in molten iron as the desulphurizing agent for molten iron desulphurizing, wherein the mass ratio of the passivated magnesium, the lime and the limestone is 1 to (2-8) to (1-4), the diameter of the passivated magnesium particles and a spraying gun insertion depth satisfy the following relational expression: d=Y[6.75*10<-6>h(1+0.625h)<1 / 2>]<2 / 3>, Y is a prepositive coefficient, h is the spraying gun insertion depth, and d is the diameter of the passivated magnesiumparticles. For the composite injecting molten iron desulphurizing agent and the desulphurizing technology, by adopting an entirely new desulphurizing agent combination and optimizing the technologicalparameters including a desulphurizing agent proportion, the desulphurizing agent granularity and the spraying gun insertion depth, the desulphurizing rate and the utilization rate of the desulphurizing agent are greatly increased, and the desulphurizing cost is lowered.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a compound injection molten iron desulfurizer and a desulfurization process thereof. Background technique [0002] At present, hot metal desulfurization mainly includes: KR (mechanical stirring) desulfurization, single-blowing granular magnesium desulfurization and composite injection desulfurization. The combined injection molten iron desulfurization process is a molten iron desulfurization process developed at home and abroad in recent years. It is widely used in molten iron desulfurization because of its flexibility and high degree of automation. The traditional composite injection desulfurization process is mostly passivated magnesium-lime composite injection desulfurization, the essence of which is to use passivated magnesium and lime to compositely inject a certain proportion into the molten iron from the spray gun, and react with the sulfur in the molten iron to form su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C7/064
CPCC21C1/025C21C7/0645
Inventor 孙伟朱万军齐江华陈俊孚杨成威张剑君
Owner 武汉钢铁有限公司
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