Magnesium-aluminum spinel-BN-Sialon multiphase refractory raw material and preparation method thereof

A technology of magnesium aluminum spinel and refractory raw materials, applied in the field of refractory materials, can solve the problems of waste, ineffective use of resources, high cost of magnesium aluminum spinel, BN, Sialon, etc., to achieve low cost, low cost, resource The effect of high degree of utilization

Active Publication Date: 2015-07-08
铜陵博雅渡业新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that existing low-grade boron ore and low-grade bauxite are not effectively utilized to cause waste of resources, and the cost of industrial production of magnesia-aluminum spinel, BN, and Sialon is relatively high. A kind of magnesium aluminum spinel-BN-Sialon composite refractory material and preparation method thereof

Method used

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Examples

Experimental program
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preparation example Construction

[0021] A preparation method of magnesia-aluminum spinel-BN-Sialon composite refractory raw material, comprising:

[0022] Crushing low-grade magnesia borate boron ore and low-grade bauxite into powder with an average particle size of less than 0.30 mm, the low-grade magnesia borate boron ore is tailings produced in the mining of magnesia borate borate ore , where B 2 o 3 The mass percentage is greater than 3.5%, and the MgO mass percentage is 10-36%. The low-grade bauxite is the tailings produced in the mining of high-alumina bauxite, wherein, Al 2 o 3 The mass percentage is 15~34%, SiO 2 The mass percentage is greater than 25%, Fe 2 o 3 The mass percentage is less than 8%;

[0023] Mixing the low-grade magnesia borate boron ore, low-grade bauxite and coke powder crushed into powder in proportion to form a batch, and drying the batch;

[0024] Carbothermal reduction and nitriding reaction is carried out on the batch material to obtain the coarse material of the magnesiu...

Embodiment 1

[0041] Raw materials and ratio:

[0042] The mass percentage of low-grade magnesium borate boron ore (or tailings) added is 26%, of which B 2 o 3 The content percentage is 5.4%, the MgO content percentage is 22.9%, and the SiO 2 The content percentage is 15.6%, and the average particle size after crushing is less than 0.18mm; the mass percentage of low-grade bauxite (or tailings) added is 55%, of which Al 2 o 3 The content percentage is 27.3%, SiO 2 Content percentage 45.3%, Fe 2 o 3 The content percentage is 5.8%, and the average particle size is less than 0.18mm after crushing; the mass percentage of coke powder added is 19%, the C content percentage is 92%, and the average particle size is less than 0.18mm.

[0043] Calcination:

[0044] First, low-grade magnesium borate boron ore (or tailings) and low-grade bauxite (or tailings) are calcined at 1000°C for 3 hours to remove structural water.

[0045] Ingredients, mix:

[0046] The calcined product and coke are put ...

Embodiment 2

[0059] The mass percentage of low-grade magnesium borate boron ore (or tailings) is 30%, of which B 2 o 3 The content percentage is 6.2%, the MgO content percentage is 21.9%, and the SiO 2 The content percentage is 17.6%, and the average particle size after crushing is less than 0.18mm; the mass percentage of low-grade bauxite (or tailings) added is 50%, of which Al 2 o 3 The content percentage is 28.6%, SiO 2 Content percentage 42.4%, Fe 2 o 3 The content percentage is 4.6%, and the average particle size is less than 0.18mm after crushing; the mass percentage of coke powder added is 20%, the C content percentage is 92%, and the average particle size is less than 0.18mm.

[0060] Calcination:

[0061] First, low-grade magnesium borate boron ore (or tailings) and low-grade bauxite (or tailings) are calcined at 1000°C for 3 hours to remove structural water.

[0062] Ingredients, mix:

[0063] The calcined product and coke are put into the mixer according to the proportio...

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Abstract

The invention discloses a magnesium-aluminum spinel-BN-Sialon multiphase refractory raw material and a preparation method thereof. According to the preparation method, low-grade magnesium borate boron ore or tailings thereof, low-grade bauxite or bauxite tailings thereof and coke powder are used as main raw materials, carbon thermal reduction nitridation reaction is performed at an appropriate temperature according to requirements of needed refractory materials by virtue of component design, and the product is crushed and ground after cooling to obtain MgAl2O4-BN-Sialon multiphase refractory raw material powder. The magnesium-aluminum spinel-BN-Sialon prepared by the method provided by the invention mainly comprises the composition phases of beta-Sialon, Mg-Sialon, BN, MgAl2O4 (magnesium-rich or aluminum-rich magnesium-aluminum spinel) and a small amount of Al6O3N4, Fe3Si and the like; and the preparation method disclosed by the invention has the significant advantages of high solid waste resource utilization degree, low cost and low energy consumption.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a magnesium aluminum spinel-BN-Sialon composite refractory material and a preparation method thereof. Background technique [0002] Mineral resources play an important and fundamental role in my country's economy and society. However, most mines in my country have long adopted rough management or even predatory mining of "mining the rich and abandoning the poor", which has led to the continuous reduction of my country's mineral resources and serious damage to the living environment. A large number of low-grade ores and their tailings formed at the same time occupy a large area of ​​land, and also lose a large amount of useful components. However, with the rapid development of the economy, the contradiction between supply and demand of mineral resources has become increasingly prominent, and rich ore resources have been increasingly exhausted. Low-grade ore and its tailings are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/443C04B35/583C04B35/626
Inventor 侯喜锋黄军同王小军张尚铎崔应武
Owner 铜陵博雅渡业新材料科技有限公司
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