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Production method of active calcium silicate

A technology of active calcium silicate and production method, which is applied in the direction of silicate, alkaline earth metal silicate, alumina/aluminum hydroxide, etc., can solve the problem of high impurity content, achieve product quality assurance, reduce control difficulty, and improve Yield Effect

Inactive Publication Date: 2013-06-12
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is exactly to the problem existing in above-mentioned prior art, has proposed a kind of production method of active calcium silicate, and this method can effectively solve the problem that the impurity content in the active calcium silicate filler is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of production method of active calcium silicate, concrete method is as follows:

[0025] The quicklime produced by calcination of limestone is cooled to 100°C, sieved through a finished product vibrating screen to remove quicklime and impurities with a particle size of less than 10mm, and used in the raw slurry preparation process of the alumina production system to collect quicklime particles with a particle size of more than 10mm. And sent to the lime machine to make milk of lime with a concentration of 180g / L;

[0026] The above-mentioned milk of lime with a concentration of 180g / L is subjected to centrifugal sedimentation with a cyclone, the overflow is refined milk of lime with a particle size of less than 75 μm, and the underflow is centrifugal sediment with a particle size of more than 75 μm, which is used for the preparation of raw slurry in the alumina production system process;

[0027] The main component SiO 2 The pre-desilicate sodium silicate feed ...

Embodiment 2

[0031] A kind of production method of active calcium silicate, concrete method is as follows:

[0032] The quicklime produced by calcination of limestone is cooled to 90°C, sieved through a finished product vibrating screen to remove quicklime and impurities with a particle size of less than 10mm, and used in the raw slurry preparation process of the alumina production system to collect quicklime particles with a particle size of more than 10mm. And sent to the lime machine to make milk of lime with a concentration of 170g / L;

[0033] The above-mentioned milk of lime with a concentration of 170g / L is subjected to centrifugal sedimentation with a cyclone, the overflow is refined milk of lime with a particle size of less than 75 μm, and the underflow is centrifugal sediment with a particle size of more than 75 μm, which is used for raw slurry preparation of the alumina production system process;

[0034] The main component SiO 2 The pre-desilicate sodium silicate feed liquid w...

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Abstract

The invention provides a production method of active calcium silicate. The production method of the active calcium silicate is characterized by comprising the following steps of calcining limestone, cooling the limestone, screening the limestone to collect calcium oxide particles with the particle size of over 10 mm, conducting incineration to manufacture lime milk, wherein the concentration of the lime milk is 140-190g / L, conducting centrifugal sedimentation on the manufactured lime milk, collecting refined lime milk with the particle size less than 75 mu, filtering sodium silicate feed liquid of pre-desilication, wherein the content of seston in the sodium silicate feed liquid is enabled to be less than 0.1g / L, obtaining sodium silicate fine liquid, conducting a hydrothermal reaction on the manufactured refined lime milk and the sodium silicate fine liquid, conducting slag removal and washing on a product of the hydrothermal reaction, and obtaining the active calcium silicate. The production method of the active calcium silicate can effectively solve the problem that impurity content of the active calcium silicate serving as pack is high.

Description

technical field [0001] The invention relates to a production method of active calcium silicate, which belongs to the field of high-tech resource utilization of fly ash. Background technique [0002] Active calcium silicate is a by-product produced from lime milk and desiliconized product sodium silicate solution in the process of extracting alumina from high-alumina fly ash by pre-desilication-soda lime sintering method. It belongs to a new type of filler. Active calcium silicate is also known as highly dispersed calcium silicate, and its molecular formula can be expressed as CaO·mSiO 2 ·nH 2 O, non-toxic and tasteless, insoluble in water, alcohol and alkali, soluble in acid, with the same siloxyl and silanol functional groups on the surface as silica, the individual particles are mainly honeycomb, layered, curly layered, The appearance is curved and wrinkled, and the specific surface area is as high as 251.3m 2 / g, specific gravity 0.2-0.3g / cm 3 , has great adsorption a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/24C01F7/02
Inventor 张先奇闫绍勇
Owner NORTHEASTERN UNIV
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