Low carbon magnesia carbon brick and preparation method thereof

The technology of carbon magnesia carbon brick and magnesia sand is applied in the field of low carbon magnesia carbon brick and its preparation, which can solve the problems of reduced thermal shock resistance, increased thermal expansion rate, accelerated erosion, etc., so as to improve peeling resistance and reduce thermal expansion. rate, and the effect of improving quality

Active Publication Date: 2009-09-16
JINAN LUDONG REFRACTORY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

GOR converter is a bottom-blown converter with multiple energy media composite blowing. The furnace bottom lining bricks are generally made of magnesia-calcium bricks or magnesia-chrome bricks. There are only a dozen heats or dozens of heats, and the highest is only about 50 heats, which directly causes many losses and cost increases to iron and steel enterprises, and affects the normal smelting of stainless steel.
The existing ordinary magnesia carbon bricks generally have a carbon content of 10-18%. When used as a furnace lining, although the thermal expansion rate is low and has good spalling resistan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: A low-carbon magnesia-carbon brick and its preparation method: when the carbon content of the low-carbon magnesia-carbon brick is required to be 2 to 5% for smelting steel grades, the preparation method of adding only a single expanded graphite is adopted, and the raw material addition ratio is : 64-70wt% magnesia particles, 23-28wt% magnesia fine powder, 1-5wt% antioxidant, 2-5wt% expanded graphite, 0.1-5wt% metal fiber, 1.5-4.5wt% Phenolic Resin.

[0021] The preparation process is as follows:

[0022] (1) Part of the fused magnesia is crushed and sieved into three kinds of magnesia particles with a particle size of 5-3mm, 3-1mm and <1mm, and part of the magnesia particles are finely ground into magnesia with a particle size of ≤0.088mm powder;

[0023] (2), the magnesia fine powder of 23~25wt% is mixed with the antioxidant of 1~5wt% evenly, becomes mixed powder, and antioxidant is the mixed powder of Al powder, Si powder, AlMg alloy powder, SiC powder; ...

Embodiment 2

[0029] Example 2: A low-carbon magnesia-carbon brick and its preparation method: when the carbon content of the low-carbon magnesia-carbon brick is required to be 5-7% for smelting steel grades, the preparation method of composite addition of expanded graphite and flake graphite is adopted, and the ratio of raw materials added It is: 58-66wt% magnesia particles, 20-27wt% magnesia fine powder, 1-5wt% antioxidant, 0.5-3wt% expanded graphite, 3-6wt% flake graphite, 0.1-5wt% Metal fiber, 1.5-4.5wt% phenolic resin.

[0030] The preparation process is as follows:

[0031] (1) Part of the fused magnesia is crushed and sieved into three kinds of magnesia particles with a particle size of 5-3mm, 3-1mm and <1mm, and part of the magnesia particles are finely ground into magnesia with a particle size of ≤0.088mm powder;

[0032] (2), the magnesia fine powder of 20~27wt% is mixed with the antioxidant of 1~5wt% evenly, becomes mixed powder, and antioxidant is AlMg alloy powder;

[0033] ...

Embodiment 3

[0038] Example 3: A low-carbon magnesia-carbon brick and its preparation method: when the carbon content of the low-carbon magnesia-carbon brick is required to be 4-6% for smelting steel grades, the preparation method of composite addition of expanded graphite and flake graphite is adopted, and the raw materials are added The ratio is: 62-68wt% magnesia particles, 23-28wt% magnesia fine powder, 1-5wt% antioxidant, 1-3wt% expanded graphite, 2-4wt% flake graphite, 0.1-5wt% Metal fiber, 1.5-4.5wt% phenolic resin.

[0039] The preparation process is as follows:

[0040] (1) Part of the fused magnesia is crushed and sieved into three kinds of magnesia particles with a particle size of 5-3mm, 3-1mm and <1mm, and part of the magnesia particles are finely ground into magnesia with a particle size of ≤0.088mm powder;

[0041] (2), the magnesia fine powder of 23~28wt% is mixed with the antioxidant of 1~5wt% evenly, becomes mixed powder, and antioxidant is the mixed powder of Al powder...

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Abstract

The invention relates to the technical field of magnesia carbon brick refractory materials, in particular to a low carbon magnesia carbon brick and a preparation method thereof. The technical proposal comprises the following steps: mixing 58 to 70 weight percent of magnesite grains, 20 to 28 weight percent of magnesite fine powder, 0.5 to 5 weight percent of expansion graphite, 0 to 6 weight percent of crystalline flake graphite, 1 to 5 weight percent of antioxidant, 0.1 to 5 weight percent of metal fibre and 1.5 to 4.5 weight percent of phenolic resin; and molding and drying the mixture to prepare a low carbon magnesia carbon brick of which carbon content is between 2 and 7 percent. The low carbon magnesia carbon brick prepared by the invention has the advantages of low heat expansion rate, good scale resistant performance, good high temperature strengthen, good thermal shock resistant performance, good toughness and corrosion resistance, and the brick is not easy to fracture when using.

Description

Technical field: [0001] The invention relates to the technical field of magnesia-carbon brick refractory materials, in particular to a low-carbon magnesia-carbon brick and a preparation method thereof. Background technique: [0002] A low-cost raw material smelting stainless steel technology "GOR gas-oxygen smelting technology" from Russia, Ukraine and other countries has been successfully adopted by some domestic iron and steel enterprises. GOR converter is a bottom-blown converter with multiple energy media composite blowing. The furnace bottom lining bricks are generally made of magnesia-calcium bricks or magnesia-chrome bricks. There are only a dozen heats or dozens of heats, and the highest is only about 50 heats, which directly causes many losses and cost increases to iron and steel enterprises, and affects the normal smelting of stainless steel. The existing ordinary magnesia carbon bricks generally have a carbon content of 10-18%. When used as a furnace lining, alth...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 吕仁祥方元德刘在春纪怀杰
Owner JINAN LUDONG REFRACTORY CO LTD
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