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Fluoride-free refined flux slagging agent and preparation method and application method thereof

A technology of slag agent and tailing slag, which is applied in the field of iron and steel metallurgy, can solve the problems of high production cost and complicated preparation process of fluoride-free slag agent, and achieve the effect of low cost, simple production process and good effect of slag removal

Inactive Publication Date: 2020-06-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is: the production cost of the existing fluoride-free slag agent is high, and the preparation process is complicated

Method used

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  • Fluoride-free refined flux slagging agent and preparation method and application method thereof

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preparation example Construction

[0030] The present invention also provides a preparation method of the above-mentioned fluorine-free refining auxiliary melting slag agent, which comprises the following steps:

[0031] a. Stir and mix 40-60% of continuous casting slag and tailings, 20-40% of ferro-vanadium smelting corundum slag, and 8-20% of industrial barium carbonate for 5-7 minutes. Add auxiliary material forming binder, stir and mix for 3-5 minutes. Prepare a dry blend;

[0032] b. The dry mixture is pressed by a powerful ball press to obtain pellets, and the pellets with a particle size ≥ 5mm are screened out, which are fluorine-free refining auxiliary melting slag agent pellets.

[0033] Wherein, in the method for preparing the fluorine-free refining auxiliary melting slag agent, the size of the pellet in step b is 20 to 35 mm.

[0034] Wherein, in the preparation method of the above-mentioned fluorine-free refining auxiliary melting slag agent, the control pressure during ball pressing in step b is 8-12 MPa. ...

Embodiment 1

[0039] Example 1 Using the fluorine-free refining auxiliary melting slag agent of the present invention to slag M3A35 steel

[0040] To prepare pellets, the specific operations are as follows:

[0041] a. Stir and mix 500kg of continuous casting slag and tailings, 300kg of ferro-vanadium smelting corundum slag, and 160kg of industrial barium carbonate for 7min, add auxiliary material forming binder (16kg of bentonite and 24kg of cement), stir and mix for 4min to obtain a dry mixture ;

[0042] b. Use a powerful ball press to press the dry mixture into pellets with a pressure of 8 MPa to obtain pellets with a size of 30 mm; the pellets with a particle size ≥ 5 mm are screened out for use.

[0043] The above pellets were added according to 15% of the added lime during washing of the converter tapping slag. After addition, the small platform was stirred with atmospheric argon for 2 minutes; the heating process of LF was added at 10% of the added lime.

[0044] The slag-forming time of Exa...

Embodiment 2

[0045] Example 2 Using the fluorine-free refining auxiliary melting slag agent of the present invention to slag SAPH440-B steel

[0046] To prepare pellets, the specific operations are as follows:

[0047] a. Stir and mix 500kg of continuous casting slag tailings, 300kg of ferro-vanadium smelting corundum slag, and 160kg of industrial barium carbonate for 7 minutes, add auxiliary material forming binder (16kg of bentonite and 24kg of cement), stir and mix for 3 minutes to obtain a dry mixture ;

[0048] b. Use a powerful ball press to press the dry mixture with a pressure of 10 MPa to obtain pellets with a size of 20 mm; the pellets with a particle size ≥ 5 mm are screened out for use.

[0049] The above pellets were added at 10% of the added lime when washing the converter tapping slag. After adding, the small platform was stirred with atmospheric argon for 3 minutes; the heating process of LF was added at 10% of the added lime.

[0050] The slag-forming time of Example 2 is 3 minutes...

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Abstract

The invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a fluoride-free refined flux slagging agent and a preparation method and application method thereof. Aiming at the problems that an existing fluoride-free slagging agent is high in production cost and complex in preparation process, the invention provides the fluoride-free refined flux slagging agent, which comprises the components in percentages by weight: main raw materials including 40-60% of continuous casting slag tailings, 20-40% of ferrovanadium smelting corundum slag and 8-20% of industrial barium carbonate, and an auxiliary material forming binder accounting for 3-4% of total mass of the main raw materials. The invention further provides the preparation method and application method of the slagging agent. The slagging agent is good in slagging effect and can effectively replace fluorite, and the production cost is reduced. By adopting a dry ball pressing mode, appropriate ball pressing parameters are determined through tests, and the preparation method and the application method are simple in production process, high in efficiency, low in cost and suitable for industrialapplication.

Description

Technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and specifically relates to a fluorine-free refining auxiliary melting slag agent and a preparation and use method thereof. Background technique [0002] As a traditional flux for slagging, fluorite is widely used because of its rapid slagging. However, when fluorite rapidly slags, it will aggravate the corrosion of the furnace lining and affect the furnace age. At the same time, the viscosity of this slag system is small, which is not conducive to submerged arc operation, resulting in radiation erosion of the arc to the lining; and it has a role in high temperature and slag. The fluoride in fluorite becomes volatile (SiF4, HF), which not only has a corrosive effect on equipment and people, but also causes environmental pollution to air and water; secondly, China’s fluorite reserves are about 60 million tons According to relevant predictions, the mining life of fluorite resources in...

Claims

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Application Information

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IPC IPC(8): C21C7/076
CPCC21C7/076Y02P10/20
Inventor 周伟王建张彦恒
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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