Preparation method of tobermorite

A tobermorite and desiliconization technology, which is applied in the field of production of tobermorite preparation, can solve the problems of unstable water between layers of molecular structure and the like, and achieve the effects of good thermal stability and volume stability.

Active Publication Date: 2014-04-09
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a preparation method of tobermorite, which solves the

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] Add 20 g of fly ash to 81.43 g of 14% sodium hydroxide solution, stir to form a slurry, control the mass ratio of sodium hydroxide and fly ash to 0.5:1 under this condition, and the temperature of the slurry rises to 120°C, desiliconization under this condition for 2 hours, after the reaction, the desilication slurry is separated from solid and liquid, and the desilication filtrate is finely filtered through a leaf filter. The solid is used as the raw material for alumina production, and the liquid is the desiliconization. Silicon liquid, diluted with water to 2.67L, wherein, SiO 2 The concentration is 2.99g / L, and it is used as the siliceous raw material for hydrothermal synthesis of tobermorite. Then the limestone obtained from the quarry is crushed, washed and graded, and the size is controlled to 80mm. It is calcined with 30mm anthracite in the vertical kiln, and the obtained lime is sieved to remove cinder (ash), small lime and lime dust. After crushing to 20mm, m...

Embodiment 2

[0020] Adding 20 g of fly ash to 60 g of 15% sodium hydroxide solution and stirring to form a slurry, under this condition the mass ratio of sodium hydroxide and fly ash dry basis is controlled to be 0.45:1, and the temperature of the slurry rises To 115°C, desiliconization under this condition for 3 hours. After the reaction, the desiliconization slurry is separated from solid and liquid, and the desilication filtrate is finely filtered through a leaf filter. The solid is used as the raw material for alumina production, and the liquid is the desiliconization liquid. , diluted to 3L, its SiO 2 The concentration is 2.67g / L, and it is used as the siliceous raw material for hydrothermal synthesis of tobermorite. After the limestone obtained from the quarry is crushed, washed and graded, the size is controlled to be 70mm, and 25mm anthracite is used for calcination in the vertical kiln, and the obtained lime is sieved to remove cinder (ash) and small lime and lime dust. After cru...

Embodiment 3

[0022] Fly ash 20g is joined in the sodium hydroxide solution 75g that concentration is 16%, forms slurry after stirring, controlled the mass ratio of sodium hydroxide and fly ash dry basis under this condition to be 0.6:1, the slurry temperature rises To 125°C, desiliconization under this condition for 2.5 hours, after the reaction, the desilication slurry is separated from solid and liquid, and the desilication filtrate is finely filtered through a leaf filter. The solid is used as the raw material for alumina production, and the liquid is desilication solution, diluted to 4L, its SiO 2 The concentration is 2.88g / L, and it is used as the siliceous raw material for hydrothermal synthesis of tobermorite. Then the limestone obtained from the quarry is crushed, washed and graded, and the size is controlled to 90mm. It is calcined with 35mm anthracite in the shaft kiln, and the obtained lime is sieved to remove cinder (ash), small lime and lime dust. After crushing to 12mm, mix ...

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Abstract

The invention discloses a preparation method of tobermorite. The preparation method comprises the following steps: removing amorphous activated SiO2 in pulverized fuel ash by use of sodium hydroxide alkaline liquor so as to obtain a sodium silicate solution with an appropriate concentration, wherein the sodium silicate solution is used as a siliceous material; further performing hydro-thermal synthesis with refined lime milk to finally obtain a tobermorite product.

Description

technical field [0001] The invention relates to a preparation method for producing tobermorite, in particular to a method for preparing tobermorite by hydrothermal synthesis reaction. Background technique [0002] Tobermorite, also known as Tobermorite, is a hydrated calcium silicate, which is mainly used as one of the main components of calcium silicate thermal insulation materials. Its composition is Ca 5 (Si 6 o 18 h 2 )·4H 2 O, one of the H 2 The O molecule is two hydroxyl groups connected to the oxygen in the silicon-oxygen tetrahedron, and the remaining four water molecules are interlayer water. Tobermorite is mostly used as a cementing material for building materials, and can be used for cement and ceramic production. [0003] At present, the industrial production of tobermelite products is obtained by the industrial water glass produced by the alkali fusion of quartz sand and diatomite as the siliceous raw material, and the calcium carbide slag is used as the ...

Claims

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Application Information

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IPC IPC(8): C01B33/24
Inventor 孙俊民张战军徐鹏王成海魏晓芬陈杨白柳杨宋晓明
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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