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Composite desulfurizer and preparation method thereof

The technology of desulfurizer and passivator is applied in the field of composite desulfurizer and its preparation, which can solve the problems of aggravated erosion, magnesium loss and high content, and achieve the effects of less consumption in desulfurization process, reduction of iron loss, and improvement of slag removal rate.

Pending Publication Date: 2021-09-07
湛江申翰科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing lime powder desulfurizer has a relatively light specific gravity, and the floating speed in the molten iron is relatively fast; at the same time, the generated CaS is easy to agglomerate, causing the inside to float into the slag before it reacts, resulting in a large consumption of CaO powder, and at the same time The viscosity of desulfurization and the temperature drop of molten iron are very large, and solid dry slag will be formed soon, making it more difficult to remove slag, and a large amount of iron in the slag will cause high iron loss
However, the magnesium-based desulfurizer will remain in the molten iron after use, resulting in the loss of some magnesium; and at high temperature, because the vapor pressure of magnesium is too high, it is difficult to control, which will cause large fluctuations in desulfurization efficiency
In addition, Na in soda powder desulfurizer 2 CO 3 It is easy to evaporate to generate a large amount of smoke, which will pollute the air, block the pipeline, and aggravate erosion; at the same time, the Na in the slag 2 The high content of O will severely corrode refractory materials such as lining; and, Na 2 CO 3 The cost is relatively high, and it is subject to greater restrictions in use

Method used

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  • Composite desulfurizer and preparation method thereof

Examples

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preparation example Construction

[0034] The present invention also provides a preparation method of a composite desulfurizer, comprising the steps of:

[0035] (1) Get limestone and carry out crushing process:

[0036] Lime with a particle size of <20mm is fed into the column mill through the feeder for roller milling, and then sent to the classification equipment. After the first classification, the fine particles of <2mm are collected by the collector and then classified for the second time to obtain ≥2mm. The coarse particles are returned to the column mill to continue the roller milling process; after the second classification, the superfine particles <0.3mm are collected by the collector and transported back to the sintered lime bin to obtain particles with a particle size of 0.3-2mm. lime powder;

[0037] (2) prepare passivated magnesium powder:

[0038] (21) Grinding metallic magnesium to a particle size of 0.5 to 1.5 mm;

[0039](22) Prepare metal magnesium passivator, mix metal magnesium powder wi...

Embodiment 1

[0046] Example 1 of the present invention discloses a composite desulfurizer, comprising the following components by weight: 59 parts of lime powder, 3 parts of calcium carbide powder, 6 parts of magnesium powder, 3 parts of aluminum powder, 1.5 parts of fluorite powder, and 1.5 parts of edible alkali , 3 carbon powder and 1 aluminum oxide.

[0047] Embodiment 1 of the present invention also provides a preparation method of a composite desulfurizer, comprising the following steps:

[0048] (1) Get limestone and carry out crushing process:

[0049] Lime with a particle size of <20mm is fed into the column mill through the feeder for roller milling, and then sent to the classification equipment. After the first classification, the fine particles of <2mm are collected by the collector and then classified for the second time to obtain ≥2mm. The coarse particles are returned to the column mill to continue the roller milling process; after the second classification, the superfine p...

Embodiment 2

[0059] Example 2 of the present invention discloses a composite desulfurizer, comprising the following components by weight: 61 parts of lime powder, 6 parts of calcium carbide powder, 8 parts of magnesium powder, 6 parts of aluminum powder, 3 parts of fluorite powder, and 2.5 parts of edible alkali , 4.5 parts carbon powder and 3 parts aluminum oxide.

[0060] Embodiment 2 of the present invention also provides a preparation method of a composite desulfurizer, comprising the following steps:

[0061] (1) Get limestone and carry out crushing process:

[0062] Lime with a particle size of <20mm is fed into the column mill through the feeder for roller milling, and then sent to the classification equipment. After the first classification, the fine particles of <2mm are collected by the collector and then classified for the second time to obtain ≥2mm. The coarse particles are returned to the column mill to continue the roller milling process; after the second classification, the...

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Abstract

The invention discloses a composite desulfurizer which comprises lime powder, calcium carbide powder, passivated magnesium powder, aluminum powder, fluorite powder, dietary alkali, carbon powder and aluminum oxide. The composite desulfurizer has a determined formula, the desulfurization effect is excellent and stable, and the requirement for the temperature of molten iron in the desulfurization process is low. In addition, the invention also discloses a preparation method of the composite desulfurizer. Firstly, after limestone is taken to be crushed, the lime powder is obtained, then after metal magnesium is taken to be crushed, passivating treatment is carried out, and the passivated magnesium powder is obtained; and then all the raw materials are taken, the calcium carbide powder, the aluminum powder, the fluorite powder, the dietary alkali, the carbon powder and the aluminum oxide are preliminarily crushed, then all the raw materials are mixed and ground, and the composite desulfurizer is prepared. In addition, the preparation method is simple in overall operation, simple in raw material formula and low in cost.

Description

technical field [0001] The invention relates to the technical field of molten iron pretreatment, and more specifically relates to a composite desulfurizer and a preparation method thereof. Background technique [0002] Hot metal spray desulfurization is a method of pre-desulfurization of molten iron by spraying desulfurization powder into molten iron with inert gas or compressed air as the carrier gas to reduce the sulfur content of molten iron. The fluidized stream formed by the powder and the carrier gas is injected into the melt at high speed, and the mixing and stirring conditions are sufficient, which provides good dynamic conditions for the physical and chemical reaction between the molten iron and the powder, so the desulfurization is rapid and effective. This process has simple equipment, low investment, flexible operation, large amount of molten iron and convenient maintenance, so it has been widely used in various countries. At present, the desulfurizers used in p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
CPCC21C7/0645C21C7/0037
Inventor 宁茵吴存芳
Owner 湛江申翰科技实业有限公司
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