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Method for preparing calcium-hexaluminate ceramic powder by calcium slag

A technology of calcium hexaaluminate and ceramic powder, which is applied in the field of preparation of ceramic materials technology, can solve the problems of low production efficiency, complex process, difficult application, etc., and achieve low requirements, simple process and wide applicability Effect

Inactive Publication Date: 2009-06-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: using pure raw materials such as alumina and calcium carbonate as raw materials, the cost is high, the process is complicated, the production efficiency is not high, and it is difficult to be applied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The weight percent of the calcium slag component is: CaO content 41.09%, Al 2 o 3 content 22.78%, Al content 22.52%, SiO 2 content 1.06%, MgO content 2.59%, TiO 2 Content 0.55%, Fe 2 o 3 Content 0.59%. Al of industrial alumina 2 o 3 Content 98.75%.

[0015] Weigh 10 kg of raw material calcium slag and 90 kg of industrial alumina according to the weight percentage of 10% calcium slag and 90% of industrial alumina, mix them evenly, and shape them. The shaped green body is placed in a reaction furnace for sintering. First heat to 300°C at a heating rate of 6°C / min, hold for 2 hours, then heat to 1000°C at a heating rate of 3°C / min, hold for 2 hours, then heat to 1300°C at a heating rate of 3°C / min, and hold for 5 hours , and finally cooled naturally to room temperature and pulverized to obtain calcium hexaaluminate ceramic powder.

[0016] The prepared calcium hexaaluminate ceramic powder, the main phase is CaAl 12 o 19 phase, in which CaO content is 7.09%, Al ...

Embodiment 2

[0018] The weight percent of the calcium slag component is: CaO content 41.09%, Al 2 o 3 content 22.78%, Al content 22.52%, SiO 2 content 1.06%, MgO content 2.59%, TiO 2 Content O.55%, Fe 2 o 3 Content 0.59%. Al of industrial alumina 2 o 3 Content 98.75%.

[0019] Weigh 15 kg of raw material calcium slag and 85 kg of industrial alumina according to the weight percentage of 15% calcium slag and 85% of industrial alumina, mix evenly, shape, and place the green body after forming in a reaction furnace for sintering. First heat to 400°C at a heating rate of 8°C / min, hold for 1 hour, then heat to 1100°C at a heating rate of 4°C / min, hold for 1 hour, then heat to 1400°C at a heating rate of 2°C / min, and hold for 4 hours , and finally cooled naturally to room temperature and pulverized to obtain calcium hexaaluminate ceramic powder.

[0020] The prepared calcium hexaaluminate ceramic powder, the main phase is CaAl 12 o 19 phase, in which CaO content is 8.29%, Al 2 o 3 Co...

Embodiment 3

[0022] The weight percent of the calcium slag component is: CaO content 41.09%, Al 2 o 3 content 22.78%, Al content 22.52%, SiO 2 content 1.06%, MgO content 2.59%, TiO 2 Content 0.55%, Fe 2 o 3 Content 0.59%. Al of industrial alumina 2 o 3 Content 98.75%.

[0023] Weigh 20 kg of raw material calcium slag and 80 kg of industrial alumina according to the weight percentage of 20% calcium slag and 80% of industrial alumina, mix them evenly, and shape them. The shaped body is placed in a reaction furnace for sintering. First heat to 500°C at a heating rate of 10°C / min, hold for 0.5h, then heat to 1200°C at a heating rate of 5°C / min, hold for 0.5h, then heat to 1500°C at a heating rate of 1°C / min, Insulate for 3 hours, and finally cool down to room temperature naturally, and pulverize to obtain calcium hexaaluminate ceramic powder.

[0024] The prepared calcium hexaaluminate ceramic powder, the main phase is CaAl 12 o 19 phase, in which CaO content is 9.09%, Al 2 o 3 Co...

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Abstract

The invention relates to a method for preparing calcium hexaluminate ceramic powder from calcium slag in the technical field of ceramic materials, which comprises: firstly, adopting the calcium slag and industrial alumina as raw materials, and preparing the calcium hexaluminate ceramic powder by a reaction sintering method, wherein the weight percentage of the calcium slag and the industrial alumina is respectively 10 to20 percent and 80 to 90 percent, and the sum of the weight percentage of the calcium slag and the industrial alumina is 100 percent; secondly, performing uniform mixing and forming, and placing formed blanks into a high-temperature furnace for sintering; and thirdly, naturally cooling the formed blanks to the room temperature, crushing the formed blanks, and obtaining the calcium hexaluminate ceramic powder. The method has simple and convenient technology, has low requirements on the calcium slag raw material, does not need to treat the calcium slag, can prepare the calcium slag into the calcium hexaluminate ceramic powder, not only reduces the production cost of calcium hexaluminate but also realizes recycling of the calcium slag, and changes the waste into the valuable.

Description

technical field [0001] The invention relates to a preparation method in the technical field of ceramic materials, in particular to a method for preparing calcium hexaaluminate ceramic powder by using calcium slag. Background technique [0002] Calcium slag is the product slag in the process of producing calcium by the aluminothermic reduction method. The production of metallic calcium by the thermite reduction method originated from the invention by Pilz in 1922, and was later improved by the New England Lime Company of the United States, becoming the main method for commercial calcium production in Western countries. Due to the limitation of the chemical reaction process, the calcium production rate of the aluminothermic reduction method is between 30% and 40%. Therefore, a large amount of calcium slag is produced during the production of calcium by the aluminothermic reduction method. Calcium hexaaluminate (CaAl 12 o 19 , abbreviated as CA 6 ) is CaO-Al 2 o 3 Depart...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/16C04B35/44
Inventor 陈海䶮陈冲孙宝德王俊
Owner SHANGHAI JIAO TONG UNIV
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