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Forsterite-carbon refractory brick and preparation method thereof

A forsterite and refractory brick technology, applied in the field of refractory materials, can solve the problems of easy hydration and large volume expansion of dolomite, poor material volume stability, high price of chrome concentrate, etc., and achieves excellent resistance to slag penetration and low price. , the effect of low cost

Inactive Publication Date: 2008-03-26
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to save magnesia raw materials, some manufacturers add part of dolomite instead of magnesia as the main raw material to prepare refractory materials (CN1459346, CN1074635). However, dolomite is easy to hydrate and produces large volume expansion, and the volume stability of the material not good
Although magnesia plus chromite sand can produce refractory materials with good high temperature resistance (CN1060302), the price of chrome concentrate ore is expensive, the cost is too high, and chromium oxide will volatilize hexavalent chromium at high temperature, which is harmful to human body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1 A forsterite-carbon refractory brick and its preparation method is: first mix 50-65wt% forsterite clinker, 20-40wt% magnesia, 10-20wt% graphite, and add 3wt% % metal aluminum powder and metal silicon powder, and 3-5wt% phenolic resin, mixed and milled for 15-30 minutes, pressed and formed, and then heat-treated at 160-220° C. for 12-24 hours.

[0010] Among them: MgO content of forsterite clinker ≥ 43.0wt%, particle size 0-3.5mm, MgO content of magnesia ≥ 93.0wt%, particle size 0-1mm, C content of flake graphite ≥ 95.0wt%, The particle size is 0-0.15mm.

Embodiment 2

[0011] Example 2 A forsterite-carbon refractory brick and its preparation method is: first mix 75-90wt% forsterite clinker, 5-20wt% magnesia, 5-10wt% graphite, and add 2wt% % metal aluminum powder and metal magnesium powder, 3-5wt% phenolic resin, stirred for 25-30 minutes, press-molded, and then heat-treated at 160-220° C. for 12-24 hours.

[0012] Among them: MgO content of forsterite clinker ≥ 43.0wt%, particle size 0-3.5mm, MgO content of magnesia ≥ 93.0wt%, particle size 0-1mm, C content of flake graphite ≥ 95.0wt%, The particle size is 0-0.15mm.

Embodiment 3

[0013] Example 3 A forsterite-carbon refractory brick and its preparation method is: first mix 65-75wt% forsterite clinker, 15-30wt% magnesia, 8-15wt% graphite, and add 5 ~7wt% tar and pitch, stirred for 20-30 minutes, pressed into shape, and then heat-treated at 150-200°C for 12-16 hours.

[0014] Among them: MgO content of forsterite clinker ≥ 43.0wt%, particle size 0-3.5mm, MgO content of magnesia ≥ 93.0wt%, particle size 0-1mm, C content of flake graphite ≥ 95.0wt%, The particle size is 0-0.15mm.

[0015] The forsterite-carbon refractory bricks prepared according to the method described in this specific embodiment have actual measured physical and chemical indicators: the apparent porosity is 3-6%; the bulk density is 2.65-2.92g / cm 3 ; Compressive strength is 23-55.0MPa; MgO is 45-60%; C content is 4-18%.

[0016] In this specific embodiment, forsterite sand with rich resources, low price and good high temperature resistance is used as the base material to replace the ma...

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Abstract

The present invention relates to forsterite-carbon refractory brick and its making process. The technological scheme of the present invention is that the forsterite-carbon refractory brick making process includes mixing forsterite clinker in 50-90 wt%, magnesia in 5-40 wt% and graphite in 5-20 wt%; adding antioxidant in 0-5 wt% and binding agent in 3-7 wt% through stirring or rolling for 15-30 min; pressing to form; and heat treatment at 150-240 deg.c for 12-24 hr. Where, the antioxidant is one or mixture of metal aluminum powder, metal silicon powder and metal magnesium powder; and the binding agent is phenolic resin or mixture of tar and asphalt. The forsterite-carbon refractory brick of the present invention has low cost, environment friendship, high stability, high heat resistance, excellent corrosion resistance and high slag permeation resistance, and can meet the requirement for use in steel making apparatus.

Description

technical field [0001] The invention belongs to the field of refractory materials based on forsterite and graphite. In particular, it relates to a forsterite-carbon refractory brick and a preparation method thereof. Background technique [0002] The application of new metallurgical technologies such as intensified smelting requires a large number of high-performance refractory materials, so people have extensively researched, produced and applied magnesia-carbon refractory materials (US274387, EP0370677, Zhao 57-1663621, CN1088193, CN87108137, CN2237074, CN1153757). Because magnesia-carbon refractories have excellent high temperature resistance, corrosion resistance, thermal shock resistance, and good durability, they have become the most important high-temperature furnace lining materials in the steelmaking industry. [0003] The metallurgical industry needs to consume a large amount of magnesia-carbon refractory materials every year, but magnesia mineral resources are lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/20
Inventor 祝洪喜邓承继白晨刘水斌彭胜堂
Owner WUHAN UNIV OF SCI & TECH
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