KR desulfurizing agent, preparation method thereof and desulfurizing method adopting desulfurizing agent

A desulfurizing agent and desulfurizing molten iron technology, applied in the field of steelmaking, can solve the problems of high effluent cost, difficulty in LT ash digestion, etc., and achieve the effects of reducing production cost, promoting desulfurization effect, and improving metal yield

Active Publication Date: 2020-08-07
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The KR desulfurizer of the present invention and the desulfurization method using the desulfurizer can achieve beneficial effects such as treating waste with waste and reducing steelmaking costs, solving the problems of difficult digestion of LT ash and high effluent costs, and at the same time improving Metal yield

Method used

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preparation example Construction

[0045]The present invention provides a kind of preparation method of KR desulfurizer, described preparation method comprises: CaO powder and LT ash (the described LT ash is converter dry dedusting ash) is mixed;

[0046] Wherein, the mass ratio of the CaO powder and the LT ash is (3.5-4):(1.5-1);

[0047] In terms of mass percentage, the LT ash contains: TFe 55%-65%, CaO≤5%, MnO≤0.03%, MgO≤2%.

[0048] In one embodiment, in the preparation method of the KR desulfurizer described in the present invention, the particle diameter of the CaO powder is 0.2-1mm;

[0049] In a preferred embodiment, in the preparation method of the KR desulfurizer described in the present invention, in the CaO powder, in terms of mass percentage, particles with a particle diameter of 0.2-1mm ≥ 80%, particles with a particle diameter of less than 0.2mm Particles ≤ 10%, particles with a particle size greater than 1mm ≤ 10%.

[0050] In one embodiment, in the preparation method of the KR desulfurizer de...

Embodiment 1

[0072] In this embodiment, the preparation method of the KR desulfurizer is: mix the CaO powder and the LT ash at a mass ratio of 3.5:1.5. Wherein, in terms of mass percentage, the LT ash contains: TFe 55%-65%, CaO≤5%, MnO≤0.03%, MgO≤2%;

[0073] In the CaO powder, by mass percentage, the particles with a particle diameter of 0.2-1mm are ≥80%, the particles with a particle diameter of less than 0.2mm are ≤10%, and the particles with a particle diameter of more than 1mm are ≤10%; the particle size of the LT ash is The diameter is 50~65um;

[0074] According to the present invention, the desulfurization method includes mixing the CaO powder and LT ash with 238t (tons) of molten iron to be desulfurized at a temperature of 1300°C; wherein, the mass ratio of CaO powder to LT ash is 3.5: 1.5; CaO powder and The ratio of the mass sum of LT ash to the mass of the above-mentioned molten iron to be desulfurized is 6:900;

[0075] Specifically, including:

[0076] (1) The CaO powder a...

Embodiment 2

[0081] In the present embodiment, the preparation method of the KR desulfurizer is: mixing the CaO powder and the LT ash with a mass ratio of 4:1;

[0082] Wherein, by mass percentage, the LT ash contains: TFe 55%-65%, CaO≤5%, MnO≤0.03%, MgO≤2%; in the KR desulfurizer, the CaO powder and the LT The mass ratio of ash is 4:1;

[0083] In the CaO powder, by mass percentage, the particles with a particle diameter of 0.2-1mm are ≥80%, the particles with a particle diameter of less than 0.2mm are ≤10%, and the particles with a particle diameter of more than 1mm are ≤10%; the particle size of the LT ash is The diameter is 5~76.4um;

[0084] According to the present invention, the desulfurization method includes mixing the CaO powder and LT ash with 238t (tons) of molten iron to be desulfurized at a temperature of 1400°C, wherein the mass ratio of CaO powder and LT ash is 4:1; CaO powder and The ratio of the mass sum of LT ash to the mass of the molten iron to be desulfurized is 7:1...

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Abstract

The invention belongs to the technical field of steelmaking, and particularly relates to a KR desulfurizing agent, a preparation method thereof and a desulfurizing method adopting the desulfurizing agent. The preparation method of the KR desulfurizing agent comprises the following step of mixing CaO powder and LT ash, wherein the mass ratio of the CaO powder to the LT ash is (3.5-4):(1.5-1); and the LT ash comprises, by mass, 55-65% of TFe, less than or equal to 5% of CaO, less than or equal to 0.03% of MnO and less than or equal to 2% of MgO. By adopting the desulfurizing method, the beneficial effects of treating wastes with processes of wastes against one another, reducing the steelmaking cost and the like can be achieved, the problems of difficult digestion and high discharge cost of the LT ash are solved, and meanwhile, the metal yield is also improved. The LT ash replaces a fluorite component in a general KR desulfurizing agent, so that the production cost is further reduced, theprotection of non-renewable resources is facilitated, and stable control of the sulfur content after KR desulfurization is achieved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a KR desulfurizer, a preparation method thereof and a desulfurization method using the desulfurizer. Background technique [0002] At present, major steel mills usually adopt the KR desulfurization process. Conventional KR desulfurizer is usually CaO+ CaF 2 The composition of the mixture, where CaF 2 The content is roughly 3% to 15%, but this technical solution is not ideal in terms of protecting non-renewable resources, saving production costs, and metal yield. [0003] During the steelmaking process, some fine particles will be sucked into the ash bin by the dust removal system and become the main component of LT ash. In addition, in this process, some raw and auxiliary materials will be vaporized under the action of high temperature, and the chemical reactants produced during the vaporization process will be rapidly cooled after entering the pipeline of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
CPCC21C7/0645
Inventor 孙亮胡卫东郑全陈功马玉桥田鹏于广义
Owner BEIJING SHOUGANG CO LTD
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