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Method for producing mullite and calcium silicate by using high-alumina fly ash

A high-alumina fly ash and fly ash technology, which is applied in the direction of aluminum silicate, silicate, alkaline earth metal silicate, etc., can solve the problem of large market and policy influence, high price of industrial grade alumina, bauxite Resource scarcity and other issues, to achieve significant social benefits, reduce production costs, and make full use of resources

Active Publication Date: 2012-07-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the price of industrial grade alumina in the mixed raw materials is relatively high, and at the same time, bauxite resources are gradually scarce, which is greatly affected by the market and policies

Method used

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  • Method for producing mullite and calcium silicate by using high-alumina fly ash
  • Method for producing mullite and calcium silicate by using high-alumina fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put the high-alumina fly ash into a ball mill for dry grinding, use alumina ball stone as the grinding medium, grind for 1 hour according to the mass ratio of the grinding medium and fly ash at 3:1, and pass the finely ground fly ash through a 100-mesh sieve. Mix 15% sodium hydroxide solution with finely ground fly ash according to the liquid-solid ratio of 3:1 and move it into the reaction kettle at 600r·min -1 , Reaction at 130°C for 2h. The reacted material is moved into a filter for separation to obtain solid-phase desiliconized fly ash and liquid-phase sodium silicate solution respectively. The process water and desiliconized fly ash are mixed at a liquid-solid ratio of 3:1, and heated at 300r· min -1 , Wash at 80°C for 1h. Mix 20% hydrochloric acid with water-washed desiliconized fly ash at a liquid-solid ratio of 3:1; -1 , Wash at 80°C for 1h. Mix the process water and the desiliconized fly ash after pickling according to the liquid-solid ratio of 3:1, and -...

Embodiment 2

[0032] Put the high-alumina fly ash into a ball mill for dry grinding, use alumina ball stone as the grinding medium, grind for 1 hour according to the mass ratio of the grinding medium and fly ash at 3:1, and pass the ground fly ash through a 200-mesh sieve. Mix 5% sodium hydroxide solution with finely ground fly ash at a liquid-solid ratio of 2:1, and move it into a reaction kettle at 700r min -1 , Reaction at 104°C for 2h. The reacted slurry is moved into a filter for separation to obtain solid-phase desiliconized fly ash and fly ash desiliconized mother liquor respectively. Mix process water and desiliconized fly ash at a liquid-solid ratio of 2:1, and -1 , Wash at 80°C for 1h. Mix 22% hydrochloric acid with water-washed desiliconized fly ash at a liquid-solid ratio of 2:1; -1 , Wash at 80°C for 1h. Mix the process water and the desiliconized fly ash after pickling according to the liquid-solid ratio of 2:1, and -1 , Wash at 80°C for 1h. The washed desiliconized fly ...

Embodiment 3

[0034] Put the high-alumina fly ash into a ball mill for dry grinding, use alumina ball stone as the grinding medium, grind for 1 hour according to the mass ratio of the grinding medium and fly ash at 3:1, and pass the finely ground fly ash through a 200-mesh sieve. Mix 10% sodium hydroxide solution with finely ground fly ash at a liquid-solid ratio of 2:1, and move it into a reaction kettle at 600r·min -1 , Reaction at 104°C for 1h. The reacted slurry is moved into a filter for separation to obtain solid-phase desiliconized fly ash and fly ash desiliconized mother liquor respectively. Mix process water and desiliconized fly ash at a liquid-solid ratio of 2:1, and -1 , Wash at 80°C for 1h. Mix 20% hydrochloric acid with water-washed desiliconized fly ash at a liquid-solid ratio of 2:1; -1 , Wash at 80°C for 1h. Mix the process water and the desiliconized fly ash after pickling according to the liquid-solid ratio of 2:1, and -1 , Wash at 80°C for 1h. The washed desiliconi...

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Abstract

The invention relates to a method for producing mullite and calcium silicate by using high-alumina fly ash, and relates to the technical field of solid waste comprehensive utilization and the synthesis of fire-resisting and filling materials. The method comprises the following steps of: performing ball milling on a rejected material, namely the high-alumina fly ash of an electric power plant, which is used as a raw material, and then performing desilication reaction on the raw material and a sodium hydroxide solution; and performing water washing, acid washing, drying and baking on a solid phase to obtain a mullite product, and performing causticization, water washing and drying on a liquid phase to obtain a calcium silicate product. Compared with the prior art, the method has the characteristics of wide source of raw materials, low production cost, low energy consumption, high mullite yield and high calcium silicate quality, aluminum oxide is not required to be added, and the economical and environmental benefits are remarkable.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry, relates to the technical field of comprehensive utilization of solid waste, refractory and synthesis of filling materials, in particular to a method for producing mullite and calcium silicate by using high-alumina fly ash. Background technique [0002] Mullite (3Al 2 o 3 2SiO2 2 ) is aluminum aluminoxate mineral, is Al 2 o 3 -SiO 2 It is the only crystalline compound that exists stably under normal pressure. It has the advantages of high refractoriness, thermal shock resistance, chemical corrosion resistance, good creep resistance, high softening temperature under load, good volume stability, and strong electrical insulation. , is an ideal high-grade refractory material, widely used in metallurgy, glass, ceramics, chemical, electric power, national defense, gas and cement industries. [0003] There are very few natural mullite minerals in nature, and industrial mullite is mainly o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/24C01B33/26
Inventor 李会泉李少鹏李勇辉马艳丽
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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