Method for producing xonotlite by taking pulverized fuel ash as raw material

A technology of xonotlite and fly ash, which is applied in the production field of xonotlite, can solve the problems of using sodium hydroxide, etc., achieve the effects of reducing reaction time, protecting ecological balance, and being easy to promote in industrialization

Active Publication Date: 2014-01-29
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a method for producing xonotlite with fly ash as raw material, which solves the problem of using a large amount of sodium hydroxide in the pr

Method used

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  • Method for producing xonotlite by taking pulverized fuel ash as raw material
  • Method for producing xonotlite by taking pulverized fuel ash as raw material
  • Method for producing xonotlite by taking pulverized fuel ash as raw material

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Embodiment 1

[0029] Add 20 g of fly ash to 81.43 g of 14% sodium hydroxide solution, and form a slurry after stirring. Under this condition, the mass ratio of sodium hydroxide and fly ash dry basis is controlled to be 0.5:1, and the temperature of the slurry is Rising to 120°C, desiliconization under this condition for 2 hours, after the reaction, the desiliconization slurry is separated from the solid and liquid, and the desilication filtrate is finely filtered through a leaf filter. The solid is used as the raw material for the production of alumina, and the liquid is diluted to 2.67 L, its SiO 2 The concentration is 2.99g / L, and it is used as the siliceous raw material for hydrothermal synthesis of xonotlite. 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, mix wi...

Embodiment 2

[0032] 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 the solid and liquid, and the desilication filtrate is finely filtered through a leaf filter. The solid is used as the raw material for the production of alumina, and the liquid is 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 xonotlite. 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 crushing to 15mm, mix wit...

Embodiment 3

[0035] 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 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 the production of alumina, and the liquid is diluted to 4L , whose SiO 2 The concentration is 2.88g / L, and it is used as the siliceous raw material for hydrothermal synthesis of xonotlite. 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 with warm w...

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Abstract

The invention discloses a method for producing xonotlite by taking pulverized fuel ash as a raw material. The method comprises the following steps: with the pulverized fuel ash as a raw material, preparing a refined desilicification solution by adopting an alkali dissolution method, and mixing the refined desilicification solution with a refined lime milk solution to carry out a hydro-thermal synthesis reaction to obtain the xonotlite. According to the method for producing the xonotlite by taking the pulverized fuel ash as the raw material, the pulverized fuel ash is used as the main raw material and is effectively subjected to desilicification by using dilute alkali liquor, so that the dosage of the alkali liquor is reduced, and meanwhile, exploitation and utilization of ores, such as silica sand, kieselguhr and the like are greatly reduced.

Description

technical field [0001] The invention relates to a production method of xonotlite, in particular to a method for producing xonotlite by using fly ash as a raw material. Background technique [0002] Xonotlite is one of the main components of calcium silicate thermal insulation materials, and its composition is 6CaO·6SiO 2 ·H 2 0, its water of crystallization is the least among all calcium silicate hydrates. Compared with other inorganic thermal insulation materials, xonotlite material has many excellent properties [0003] At present, the xonotlite products used in industry are all industrial water glass produced by alkali fusion of quartz sand and diatomite as siliceous raw material; calcium carbide slag is used as calcareous raw material through dynamic hydrothermal synthesis reaction. Under such raw materials and process conditions, the hydrothermal temperature should reach above 220°C, the reaction temperature is generally greater than 15 hours, and the reaction time i...

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马雅琦许学斌
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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