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Fluoride-free composite molten iron desulfurizer and preparation method thereof

A molten iron desulfurization and composite technology, applied in the field of molten iron desulfurization, can solve the problems of reducing surface activity, reducing desulfurization effect, and difficult to ensure the uniformity of composite desulfurizers, etc.

Active Publication Date: 2021-09-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) Under this ratio, the surface of lime particles is easy to form aluminosilicate with high melting point, which reduces its surface activity, thereby reducing its desulfurization effect;
[0005] 2) After lime and aluminum slag are mixed, the contact area between aluminum slag and molten iron is small, and the deoxidation effect is low;
[0006] 3) Due to the different densities of aluminum slag and lime, it is difficult to ensure the uniformity of the composite desulfurizer after the two are mechanically mixed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of fluorine-free composite molten iron desulfurizer, comprising the following steps:

[0030] 1) The lime powder with a particle size of less than 1 mm is pelletized on a pelletizing machine, and pure alcohol of 4 wt % of the total weight of raw materials is used as a binder until the particle size of the lime ball reaches 1.5 to 3 mm. The mass percentage of CaO in the lime powder is 88.0%, and the rest are impurities. The activity of lime is 350ml.

[0031] 2) Melt the aluminum slag in the graphite crucible of the induction furnace, the melting temperature is 850°C, the weight percentage of the composition of the aluminum slag is: Al: 50.8%, Al 2 o 3 : 27.5%, SiO 2 : 10.3%, MgO: 7.0%, CaO: 2.2%, and the rest are impurities.

[0032] 3) Place the graphite crucible with molten aluminum slag in a spiral electromagnetic stirrer, turn on the stirrer, and then add the lime balls prepared in step 1) to the molten aluminum slag for coating treatment un...

Embodiment 2

[0035] A preparation method of fluorine-free composite molten iron desulfurizer, comprising the following steps:

[0036] 1) The lime powder with a particle size of less than 1 mm is pelletized on a pelletizing machine, and pure alcohol of 4 wt % of the total weight of raw materials is used as a binder until the particle size of the lime ball reaches 1.5 to 3 mm. The mass percentage of CaO in lime powder is 92.0%, and the rest are impurities. The activity of lime is 350ml.

[0037] 2) The aluminum slag is melted in the graphite crucible of the induction furnace, the melting temperature is 880°C, the weight percentage of the composition of the aluminum slag is: Al: 50.8%, Al 2 o 3 : 27.5%, SiO 2 : 10.3%, MgO: 7.0%, CaO: 2.2%, and the rest are impurities.

[0038] 3) Place the graphite crucible with molten aluminum slag in a spiral electromagnetic stirrer, turn on the stirrer, and then add the lime balls prepared in step 1) to the molten aluminum slag for coating treatment u...

Embodiment 3

[0041] A preparation method of fluorine-free composite molten iron desulfurizer, comprising the following steps:

[0042] 1) The lime powder with a particle size of less than 1 mm is pelletized on a pelletizing machine, and pure alcohol of 4 wt % of the total weight of raw materials is used as a binder until the particle size of the lime ball reaches 1.5 to 3 mm. The mass percentage of CaO in the lime powder is 95.0%, and the rest are impurities. The activity of lime is 380ml.

[0043] 2) Melt the aluminum slag in the graphite crucible of the induction furnace, the melting temperature is 900°C, the weight percentage of the composition of the aluminum slag is: Al: 50.8%, Al 2 o 3 : 27.5%, SiO 2 : 10.3%, MgO: 7.0%, CaO: 2.2%, and the rest are impurities.

[0044] 3) Place the graphite crucible with molten aluminum slag in a spiral electromagnetic stirrer, turn on the stirrer, and then add the lime balls prepared in step 1) to the molten aluminum slag for coating treatment un...

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Abstract

The invention relates to a fluoride-free composite molten iron desulfurizing agent and a preparation method. The molten iron desulfurizing agent is composed of lime particles inside and an aluminum slag layer coated outside, wherein the granularity of the molten iron desulfurizing agent is 2-4 millimeters, and the thickness of the aluminum slag layer is 0.5-1 millimeter. The fluoride-free composite molten iron desulfurizer and the preparation method thereof have the advantages that molten aluminum slag and lime with a certain particle size are uniformly stirred by utilizing a molten pool of the aluminum slag and a spiral electromagnetic stirring method, and the molten aluminum slag and the lime are crushed into the desulfurizing agent after being solidified. Desulfurizer particles are of a composite structure, after the desulfurizer particles are added into molten iron, the aluminum slag on the outer layer deoxidizes the molten iron, the activity of lime particles inside the desulfurizer particles can be guaranteed, meanwhile, low-melting-point calcium aluminate is generated according to a proper proportion, sulfur diffusion is facilitated, and then the purpose of deep desulfurization or terminal sulfur content stabilization is achieved.

Description

technical field [0001] The invention belongs to the field of hot metal desulfurization, and in particular relates to a fluorine-free composite hot metal desulfurizer and a preparation method thereof. Background technique [0002] The KR mechanical stirring method has gradually become an important technical means used by advanced steel mills at home and abroad to produce high-quality steel due to its superior kinetic conditions and the ability to use cheap lime as a desulfurizer for deep desulfurization and ultra-deep desulfurization. At present, it is still a common treatment method for steel mills to add fluorite to lime as a catalyst, because the main component of fluorite is CaF 2 It can be combined with CaO to form a low-melting eutectic melt to promote the desulfurization reaction, while CaF 2 It will corrode the furnace lining, pollute the environment and be harmful to human health, so it is very important to develop a suitable desulfurization catalyst to replace fluo...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C7/06
CPCC21C7/0645C21C7/06Y02P10/20
Inventor 康磊尚德礼康伟吕春风赵成林郭庆涛杨光唐雪峰董刚
Owner ANGANG STEEL CO LTD
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