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Magnesia-carbon modifier prepared from tundish residual linings

A modifier, magnesia-carbon technology, applied in the field of refractory materials, can solve the problems of low carbon content, affecting the life of the converter, and low magnesia content

Inactive Publication Date: 2021-05-18
北京利尔高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the slag adjustment materials widely used in steel mills include light-burned dolomite and lime. These slag adjustment materials have problems such as low magnesium oxide content, low carbon content, and poor slag adjustment effect, which seriously affect the slag splashing protection effect of the converter. Thus affecting the life of the converter

Method used

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  • Magnesia-carbon modifier prepared from tundish residual linings
  • Magnesia-carbon modifier prepared from tundish residual linings
  • Magnesia-carbon modifier prepared from tundish residual linings

Examples

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preparation example Construction

[0035] In the embodiments of the present application, the preparation method of the magnesium-carbon modifier specifically includes the following steps:

[0036] 1) Ingredients: put the residual lining, coke powder, sintered magnesia and flake graphite in the raw material into the mixing mill according to the above weight ratio;

[0037] 2) Mixing: After dry mixing for 1-2 minutes, add binder according to the above weight ratio, stir for 8-10 minutes, so that the binder is evenly distributed in the mud, add 15-20wt% water of raw materials, and wait for the mud to Mix evenly, discharge without floating fine powder and white material, and ensure that the discharge temperature is 10-40°C;

[0038] 3) Ball pressing: put the mixed mud into the ball pressing machine, 1000t high pressure ball forming;

[0039] 4) Natural drying: natural drying for 24 hours, and then bagged.

[0040] The present invention will be described in detail below, but it should be noted that the implementat...

Embodiment 1

[0042] A magnesium-carbon modifying agent prepared by tundish residual lining is composed of the following raw materials in parts by weight:

[0043] 60 parts of tundish residual lining with particle size ≤ 10mm;

[0044] 10 parts of coke powder with particle size ≤ 1mm;

[0045] 12 parts of sintered magnesia with particle size ≤0.074mm;

[0046] 15 parts of flake graphite with particle size ≤0.074mm;

[0047] The binder is 2 parts of magnesium sulfate heptahydrate and 1 part of magnesium chloride.

[0048] The preparation method of magnesium carbon modifier comprises the following steps:

[0049] 1) Ingredients: according to the ratio, put the residual lining, coke powder, sintered magnesia and flake graphite in the raw material into the mixer;

[0050] 2) Mixing: After 2 minutes of dry mixing, add the binder in proportion and stir for 10 minutes to make the binder evenly distributed in the mud, add 15wt% water of the raw material, and wait until the mud is mixed evenly w...

Embodiment 2-5

[0054] The preparation method of Examples 2-5 is the same as that of Example 1, and the ratio of each raw material is changed to prepare a magnesium-carbon modifier.

[0055] The raw material ratio of embodiment 1-5 is as shown in table 1:

[0056] Table 1

[0057]

[0058] The physical and chemical indicators of the magnesium-carbon modifier prepared in Examples 1-5 are shown in Table 2:

[0059] Table 2

[0060]

[0061]

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Abstract

The invention provides a magnesia-carbon modifier prepared from tundish residual linings. The modifier is prepared by taking tundish residual linings, coke breeze, flaky graphite and magnesite clinker as main raw materials, adding a binding agent and carrying out the processes of mixing, ball pressing, natural drying and the like. The magnesia-carbon modifier has the characteristics of high magnesia content, high carbon content and good slag adjusting effect, and can effectively adjust the final slag components of a converter, improve the MgO content in the slag, reduce the FeO content in the slag, and improve the melting point and viscosity of the slag by applying the magnesia-carbon modifier to the converter and combining the dissolution of magnesia and the reaction between carbon and ferrous oxide. The combination state of a slag bonding layer and a furnace lining is effectively improved, and the slag splashing furnace protection effect is optimized. The magnesia-carbon modifier can effectively prolong the service life of a converter, and has important significance for saving energy, reducing consumption, protecting the environment and increasing economic benefits.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a magnesium-carbon modifying agent prepared by using a middle-coated residual lining. Background technique [0002] The converter is the main equipment produced by iron and steel enterprises, and its life is directly related to the production cost of the converter. In order to ensure the normal production of the converter and further improve the service life of the lining, the technology of slag splashing is usually used to protect the furnace. After the steel is tapped out of the converter, a slag adjustment agent is added to make the MgO in it chemically react with the slag to form a series of high melting point substances, and then through the oxygen The gun sprays high-pressure nitrogen gas to make it splash on the furnace lining, which adheres to the inner wall and condenses to form a solid mold slag layer, thereby reducing the erosion and erosion of the furna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B33/132
CPCC04B35/043C04B33/1324C04B2235/425C04B2235/9607Y02P40/60
Inventor 王伟伟刘琳琳王团收曹贺任林王志星刘丽颜浩崔志强刘靖轩
Owner 北京利尔高温材料股份有限公司
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