MgO-based desulfurizer based on self-propagating and preparation thereof

A self-propagating, desulfurizing agent technology, applied in the field of desulfurization, can solve the problems of low Mg steam desulfurization efficiency, desulfurization refining cost reduction, and affecting desulfurization efficiency, etc., to achieve good kinetic conditions, high utilization rate of desulfurization agent, and high desulfurization rate Effect

Active Publication Date: 2008-11-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Using cheap carbon as a reducing agent to prepare a desulfurizer by reacting MgO+C→Mg+CO in situ can greatly reduce the cost of desulfurization and refining, and greatly improve the efficiency of the desulfurizer, but MgO+C→Mg+CO is endothermic Reaction, the reduction rate is low at the temperature of molten iron, directly using this reaction to prepare Mg steam in situ for desulfurization will cause an excessive temperature drop, which will lead to low desulfurization efficiency of Mg steam generated by carbothermal reduction, and affect desulfurization efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] MgO, graphite, aluminum powder, ferrous oxide powder, SiO 2 and lime were dried in a drying oven at a temperature of 200°C for 4 hours, and then put into a planetary ball mill and ground at a speed of 300 rpm to form a powder with a particle size of less than 200 mesh.

[0023] Mix the powders of each material, and then add asphalt for mixing. The mass ratio of the materials mixed is: MgO: graphite: (aluminum powder + ferrous oxide powder): SiO 2 : lime: asphalt = 48: 14: 16: 4: 10: 8; use a sample preparation machine to press into spherical or other shaped particles with a pressure of 20 MPa, and prepare MgO-based desulfurizer after drying.

[0024] In the iron or steel tapping process, the prepared MgO-based desulfurizer is added into the ladle or ladle, and the desulfurization rate is 88%.

Embodiment 2

[0026] MgO, charcoal, aluminum powder, ferric oxide powder, SiO 2 and limestone were dried in a drying oven at a temperature of 180°C for 8 hours, and then put into a planetary ball mill and ground at a speed of 300 rpm to form a powder with a particle size of less than 200 mesh.

[0027] Mix the powders of each material, and then add tar and mix them. The mass ratio of the materials mixed is: MgO: charcoal: (aluminum powder + ferric oxide powder): SiO 2 : limestone: tar = 45: 18: 16: 3: 10: 8; press into spherical or other shaped particles with a pressure of 20 MPa with a sample preparation machine, and prepare MgO-based desulfurizer after drying.

[0028] In the iron or steel tapping process, the prepared MgO-based desulfurizer is added into the ladle or ladle, and the desulfurization rate is 86%.

Embodiment 3

[0030] MgO, graphite, aluminum powder, ferrous oxide powder, SiO 2 and dolomite were dried in a drying oven at a temperature of 160°C for 12 hours, and then put into a planetary ball mill and ground at a speed of 300rpm to form a powder with a particle size of less than 200 mesh.

[0031] Mix the powders of each material, and then add resin to mix. The mass ratio of the materials mixed is: MgO: graphite: (aluminum powder + ferrous oxide powder): SiO 2: Dolomite: Resin = 60: 16: 8: 2: 10: 4; use a sample maker to press into spherical or other shaped particles with a pressure of 20 MPa, and prepare MgO-based desulfurizer after drying.

[0032] In the iron or steel tapping process, the prepared MgO-based desulfurizer is added into the ladle or ladle, and the desulfurization rate is 85%.

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Abstract

The invention relates to a MgO base desulfurizer based on self-propagation and a method for preparing the same. The invention is characterized in that: the MgO base desulfurizer is a particle in a spherical shape or other shapes and consists of MgO, carbonaceous reducing agent, self-propagating exothermic agent, reaction promoter, PH value modifying agent and caking agent; the MgO, the carbonaceous reducing agent, the self-propagating exothermic agent, the reaction promoter and the PH value modifying agent are respectively dried for 4 to 20 hours at a temperature of between 120 and 200 DEG C in a drying box, then grinded by a ball mill into powder with a granularity of less than 200 meshes; the material powder is mixed according to the proportion, added with the caking agent, then pressed into particles in a spherical shape or other shapes by a pressure of 20 MPa; and the particles are dried and prepared into the MgO base desulfurizer. The MgO base desulfurizer is used for desulphurization and has the advantages of less slagging amount, low desulphurization cost, high utilization rate of desulfurizer, high desulphurization rate, no obvious temperature reduction in the desulphurization process, no need of specialized desulphurization equipment, simple convenient, etc.

Description

technical field [0001] The invention belongs to the technical field of desulfurization, in particular to a self-propagating MgO-based desulfurizer and a preparation method thereof. Background technique [0002] With the development of industrial technology, the requirements for steel quality are getting higher and higher. The sulfur in the steel has a bad influence on the properties of the steel. The sulfur in the steel will reduce the plasticity and toughness of the steel. The performance of the steel is an inflection point at the sulfur content of 0.013%. The modern industry has particularly strict requirements on the sulfur content in the steel. The performance of pure steel requires that the sulfur content should be reduced to below 0.01%-0.001%. In recent years, with the emergence of step-by-step steelmaking, the converter steelmaking process has been decomposed into three stages: molten iron pretreatment, converter smelting, and out-of-furnace refining. It is complet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
Inventor 张廷安赫冀成豆志河刘燕任晓冬蒋孝丽赵秋月牛丽萍
Owner NORTHEASTERN UNIV
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