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Method for preparing calcium silicate micro power by using high alumina fly ash

A high-aluminum fly ash and calcium silicate technology, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve problems such as unfavorable large-scale industrialization promotion, expensive organic matter, consumption price, etc., and alleviate the supply of aluminum resources. Crisis, no three-waste emissions, and the effect of reducing preparation costs

Inactive Publication Date: 2009-12-02
TONGFANG ENVIRONMENT
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Problems solved by technology

The raw material of this invention is also natural wollastonite, and the raw material cost is relatively cheap, but a certain amount of expensive organic matter is consumed in the process, which is also not conducive to the large-scale industrialization of this technology.

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  • Method for preparing calcium silicate micro power by using high alumina fly ash

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Referring to accompanying drawing, production step of the present invention is:

[0026] ①Select Al-containing 2 o 3 42.5%, SiO 2 46.7% high alumina fly ash is used as the main raw material. According to the mass ratio of sodium hydroxide and high aluminum fly ash of 0.5:1, the sodium hydroxide solid was weighed. Dissolve it in water, and keep stirring to prevent the solidification of sodium hydroxide, and prepare a sodium hydroxide solution with a concentration of 15%. Add high aluminum fly ash to the prepared sodium hydroxide solution. The sodium hydroxide solution dissolved with high-aluminum fly ash was subjected to desiliconization reaction at 120°C, and the desiliconization reaction time was 2 hours. Stir continuously during the desiliconization process to prevent the agglomeration of fly ash in local areas.

[0027...

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Abstract

The invention discloses a method for preparing calcium silicate micro power by using high alumina fly ash, relating to the technical field of material and chemistry. The method comprises the steps as follows: 1. adding dry raw material high alumina fly ash into sodium hydroxide solution and stirring to carry out desiliconization reaction; 2. filtering and separating the mixture processed by desiliconization reaction, washing the filter cake to obtain desiliconized solution and desiliconized fly ash, and adding water to quicklime and stirring to obtain slurry lime cream; and 3. adding the lime cream into the desiliconized solution, stirring for reaction, filtering and washing to obtain watery calcium silicate and NaOH solution, drying the watery calcium silicate to obtain calcium silicate micro powder, and concentrating the NaOH solution for cycle use for step 1. Compared with the prior art, the method of the invention is simple in operation, low in investment, low in production cost and low in energy consumption, and the prepared calcium silicate micro power is uniform in physical and chemical performances, low in impurity content and extremely high in whiteness.

Description

technical field [0001] The invention relates to the technical fields of materials and chemical industry, in particular to a method for preparing calcium silicate micropowder by using high-alumina fly ash. Background technique [0002] Calcium silicate, white powder, its chemical formula is CaSiO 3 . Calcium silicate powder with low impurity content has good dielectric properties and high heat resistance, so it is widely used in ceramics, chemical industry, metallurgy, construction, machinery, electronics, papermaking, automobiles, agriculture and other departments. [0003] In the prior art, Chinese invention patent CN1569736 "Preparation method of degradable porous calcium silicate ceramic bioactive material", the core technology of this invention is to prepare β-calcium silicate micropowder by wet chemical method. Concrete steps are: described β-calcium silicate micropowder chemical method preparation process is to analyze pure Ca(NO 3 ) 2 4H 2 O, Na 2 SiO 3 9H 2 O...

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Application Information

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IPC IPC(8): C01B33/24
Inventor 张战军孙俊民曹慧芳张晓云王彦武姚强
Owner TONGFANG ENVIRONMENT
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