Method for preparing molten iron desulphurizer

A technology of hot metal desulfurization and additives, applied in the field of iron and steel metallurgical auxiliary materials, can solve the problems of high cost and low desulfurization efficiency, achieve the effects of suppressing volatilization, increasing desulfurization rate, and reducing costs

Inactive Publication Date: 2015-04-22
WUHU JINLONG MOLD FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of high cost and low desulfurization efficiency of molten iron desulfurizer in the prior art, the invention provides a preparation method of molten iron desulfurizer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The preparation method of desulfurizing agent of the present invention, step is as follows:

[0061] (1) Take 80 parts of CaO for passivation treatment, the process is as follows:

[0062] a. Spraying: Mix 80 parts of water and 80 parts of CaO in a container, and then spray the additive (5 parts of cyclic dimethyl silicone oil, hydraulic oil and soybean oil) on the lime surface, and rotate while spraying Spray and mix in the same way;

[0063] Among them, the raw material parameters are as follows: lime containing CaO ≥ 70-88%, its S ≤ 0.05%, activity ≥ 250ml / 4N(HCl), loss of ignition < 0.5%, angle of repose < 35°, after passivation treatment, particle size 0.01 to 0.1mm.

[0064] b. Heat preservation: heat preservation at 100~1050°C for 4 minutes to make the additive boil and completely volatilize and be absorbed by slaked lime to form a protective film;

[0065] (2) After mixing the following ingredients with the materials prepared in step (1), dry pretreatment: ...

Embodiment 2

[0076] The preparation method of desulfurizing agent of the present invention, step is as follows:

[0077] (1) Take 82 parts of CaO for passivation treatment, the process is as follows:

[0078] a. Spraying: Mix water and CaO in a mass ratio of 1:1 in a container, then spray the additive on the lime surface, and spray and mix evenly while spraying while rotating; wherein, the additive is cyclic dimethyl silicone oil 8 parts, hydraulic oil 9 parts, soybean oil 5 parts;

[0079] b. Heat preservation: heat preservation at 100~1050°C for 4 minutes to make the additive boil and completely volatilize and be absorbed by slaked lime to form a protective film;

[0080] (2) After mixing the following ingredients with the materials prepared in step (1), dry the pretreatment;

[0081] C 7 copies

[0082] Mg 7 parts

[0083] Zn 6 parts

[0084] Calcium aluminate 7 parts

[0085] 8 parts of soda ash,

[0086] Then pour the passivation solution into the above materials, stir until t...

Embodiment 3

[0090] The preparation method of desulfurizing agent of the present invention, step is as follows:

[0091] (1) Take 85 parts of CaO for passivation treatment, the process is as follows:

[0092] a. Spraying: Mix water and CaO in a mass ratio of 1:1 in a container, then spray the additive on the lime surface, and spray and mix evenly while spraying while rotating; wherein, the additive is cyclic dimethyl silicone oil 10 parts, hydraulic oil 10 parts, soybean oil 10 parts mixed;

[0093] b. Heat preservation: heat preservation at 100~1050°C for 4 minutes to make the additive boil and completely volatilize and be absorbed by slaked lime to form a protective film;

[0094] (2) After mixing the following ingredients with the materials prepared in step (1), dry the pretreatment;

[0095] C 10 copies

[0096] Mg 10 parts

[0097] Zn 10 parts

[0098] Calcium aluminate 8 parts

[0099] 10 parts of soda ash.

[0100] Among them, soda ash contains more than 90% Na 2 CO 3 , S w...

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Abstract

The invention discloses a method for preparing a molten iron desulphurizer, belongs to the technical field of ferrous metallurgy auxiliary materials and solves the problems that in the prior art, the molten iron desulphurizer is relatively high in cost and low in desulphurization efficiency. The method comprises the following steps: (1) taking 80-85 parts of CaO for passivation through the processes of spraying and heat preserving; (2) uniformly mixing other ingredients with the material prepared in step 1, and then drying for pretreatment; pouring a passivation liquid into the material, stirring till the material is dry, naturally cooling and grinding to obtain a powdery product; and (3) charging the powdery product in a damp-proof container or bag to be sealed for later use. According to the technical scheme, compared with the prior art, the consumption of magnesium is reduced, the cost is lowered, and magnesium is passivated in advance, so that the usage rate is greatly improved. By adopting the technical scheme, the sulfur content of desulphurized molten iron can be less than 0.010%, and the desulfurization time is only 50% of the traditional desulfurization time.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgical auxiliary materials, and more specifically relates to a preparation method of a molten iron desulfurizer. Background technique [0002] Sulfur in steel has adverse effects on the properties of steel, reducing the plasticity and toughness of steel, and reducing the surface and microstructure of steel. The steel required by modern industry requires that the sulfur content should be <0.015%. In order to reduce the sulfur content in steel and improve the quality level of steel. The desulfurization technology of hot metal treatment outside the furnace has become an indispensable link in the steelmaking process. [0003] Hot metal desulfurizers are divided into four categories: lime, calcium carbide, soda, and magnesium. Some other substances, such as rare earth element cerium, have a strong affinity with sulfur, but their desulfurization ability is lower than that of magnesiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02
Inventor 李大志
Owner WUHU JINLONG MOLD FORGING
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