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Method for preparing microporus, high-activity and low-density calcium silicate

A calcium silicate, high activity technology, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problems of poor quality, high filler impurity content, low calcium silicate activity, etc.

Inactive Publication Date: 2015-01-07
山西玉竹活性石灰制造有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing microporous calcium silicate with high activity and low density, which solves the problems of low calcium silicate activity, high impurity content as a filler, and poor quality in the existing methods.

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  • Method for preparing microporus, high-activity and low-density calcium silicate

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Embodiment Construction

[0016] A method for preparing microporous high-activity low-density calcium silicate. The raw materials are milk of lime and sodium silicate solution, and the molar mass of the milk of lime (in terms of CaO concentration) and sodium silicate solution (in terms of SiO2 concentration) The ratio is CaO / SiO2: 0.95~1.05, and the preparation method steps are as follows:

[0017] (1) Crushing: Put the limestone raw material into the crusher for crushing;

[0018] (2) Screening and washing: place the crushed limestone in a sieve with a pore size of 5 cm for screening, and wash the screened limestone with water at the same time;

[0019] (3) Calcination: place the screened and washed limestone in a vertical kiln for calcination, the calcination temperature is 1200°C, and the calcination time is 5 hours to produce quicklime (CaO) and carbon dioxide (CO2);

[0020] (4) Digestion: add quicklime generated by calcining limestone into hot water, the ratio of quicklime to hot water is 1:6, a...

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Abstract

The invention discloses a method for preparing microporus, high-activity and low-density calcium silicate. Microporus, high-activity and low-density calcium silicate is prepared from raw materials of lime milk and a sodium silicate solution, wherein the molar mass ratio of CaO to SiO2 is 0.95:1.05. The preparation method comprises the following steps: crushing limestone; screening and washing the crushed limestone; calcining the limestone; adding calcined limestone into hot water to generate lime milk; screening the generated lime milk, preparing the effective CaO concentration in the lime milk to be higher than 170 g / L, and performing the heating digestion; preheating the sodium silicate solution, and reacting with the lime milk by heating; after the reaction is finished, performing the settling separation, filtering and washing, wherein overflow is alkaline liquor, and underflow is hydrous calcium silicate; after hydrous calcium silicate is filtered, introducing kiln gas for drying to obtain dry calcium silicate, namely, the finished product; evaporating the reactant obtained by filtering the effusion to obtain finished product alkali liquor. Microporus, high-activity and low-density calcium silicate is prepared from high-calcium low-magnesium CaO and high-purity sodium silicate, so that the problem that active calcium silicate impurities are high in content is solved effectively.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing microporous high-activity low-density calcium silicate. Background technique [0002] The existing calcium silicate is mostly prepared by hydrothermal reaction of refined milk of lime and sodium silicate semen, and the hydrothermal reaction product is deslagged and washed to obtain calcium silicate, but most of the obtained calcium silicate has low activity and is used as The impurity content is high and the quality is poor when filling. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing microporous calcium silicate with high activity and low density, which solves the problems of low calcium silicate activity, high impurity content as filler, and poor quality in the existing method. [0004] The raw materials used in the present invention are milk of lime and sodium silicate solution, the mola...

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Application Information

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IPC IPC(8): C01B33/24
Inventor 闫祖升
Owner 山西玉竹活性石灰制造有限公司
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