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Hot metal desulphurization slag foaming agent and preparation method thereof

A technology of molten iron desulfurization slag and foaming agent, which is applied in the direction of improving process efficiency, can solve the problems of low utilization rate of casting residual slag, discarded casting residual slag, slow slag removal speed, etc. The effect of cost reduction and slag removal efficiency improvement

Inactive Publication Date: 2012-07-11
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

So far, most of the casting slag in most steelmaking plants at home and abroad have been treated by hot spraying method, dry slag method, high pressure water quenching method, drop hammer method or cutting method, but there are still complex processes, high cost, and casting slag Low utilization rate leads to waste of casting slag, environmental pollution and site occupation
[0003] On the other hand, steelworks will produce hot metal desulfurization slag during the desulfurization process. Since the hot metal desulfurization slag is relatively thin, it is difficult to remove it. Usually, a slag accumulator is added to increase the viscosity of the molten iron slag and make it easy to remove. The slag-like agent is usually a compound based on silicon and aluminum oxides, which has the problems of high cost, large amount of addition, and slow slag removal speed

Method used

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  • Hot metal desulphurization slag foaming agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) 9 parts by weight of casting residue (casting residue R=3.2) is cooled and crushed to particles with a particle diameter of 3 mm, and then the above particles are ground to a particle diameter of 1 mm;

[0029] (2) Add 1 part by weight of calcium carbide to the casting slag and grind until the particle size is 0.5 mm, then mix for 15 minutes to obtain a mixed dry material;

[0030] (3) Add 0.4 parts by weight of adhesive to the mixed dry material while mixing, and then process it into a spherical slag with a diameter of 30 mm.

[0031] (4) The spherical slag is dried at 80° C. for 6 hours to obtain the foaming agent of the present invention.

Embodiment 2

[0033] (1) 7 parts by weight of casting slag (casting slag R = 3.2) is cooled and crushed to particles with a particle size of 4 mm, and then the particles are ground to a particle size of 1.5 mm using a ball mill;

[0034] (2) Add 3 parts by weight of limestone to the casting slag and finely grind it with a Raymond mill until the particle size is 0.5 mm, then mix for 12 minutes to obtain a mixed dry material;

[0035] (3) While stirring, add 0.2 parts by weight of adhesive to the mixed dry material, and then process it into a spherical slag with a diameter of 25 mm.

[0036] (4) The spherical slag is dried at 90° C. for 4 hours to obtain the foaming agent of the present invention.

Embodiment 3

[0038] (1) 8 parts by weight of casting residue (casting residue R=3.2) is cooled and crushed to particles with a particle diameter of 3 mm, and then the particles are ground to a particle diameter of 1.2 mm;

[0039] (2) adding 1 weight part each of silicon carbide and magnesite to the casting slag and grinding until the particle size is 0.5 mm, and then mixing for 10 minutes to obtain a mixed dry material;

[0040] (3) While mixing, add 0.3 parts by weight of adhesive to the mixed dry material, and then process it into a spherical slag with a diameter of 28 mm.

[0041] (4) The spherical slag is dried at 100° C. for 3 hours to obtain the foaming agent of the present invention.

[0042] Take the actual slagging effect of molten iron passivation magnesium desulfurization in Wuhan Iron and Steel Co. kg, make the desulfurization slag foam, and carry out the slag removal after the desulfurization slag is foamy, and its effect is compared with the conventional slag gathering agen...

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Abstract

The invention discloses a hot metal desulphurization slag foaming agent and a preparation method thereof, which solve the problems of difficult skimming of hot metal desulphurization slag as well as high cost, large addition amount and slow slag skimming speed of current slag conglomeration agents in the current desulphurization process. The foaming agent of the invention, taking casting slag as base material, has the characteristic of fast melting speed, and the foaming agent for spherical slag, which is prepared by adding carbides or carbonates as aggregates for pelletizing and by a small amount of bonding agent simultaneously, has the advantages of low cost, small addition amount during slag skimming, fast skimming speed and simple preparation technology.

Description

technical field [0001] The invention relates to a foaming agent in the metallurgical industry and a preparation method thereof, in particular to a foaming agent for molten iron desulfurization slag and a preparation method thereof. Background technique [0002] Continuous casting slag refers to the remaining steel slag left in the ladle and tundish when the ladle and tundish are replaced during the continuous casting process. With the substantial increase in the output of high-quality high-carbon steel, the proportion of molten steel refining treatment is increasing day by day. After the refining treatment, the amount of steel slag remaining in the ladle continues to increase, which makes the treatment of slag factories more difficult, and new slag factories have to be added to meet its storage requirements. Turnover not only causes environmental pollution, but also causes waste of resources. Taking a steelmaking plant of Wuhan Iron and Steel (Group) Company as an example, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
CPCY02P10/20
Inventor 陈钢石磊易卫东王国平刘中桂拥胡才正
Owner 武汉钢铁有限公司
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