Preparation method of light calcium carbonate

A light calcium carbonate and limestone technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of low quality and many filler impurities

Inactive Publication Date: 2015-01-07
山西玉竹活性石灰制造有限公司
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[0003] The object of the present invention is to provide a kind of preparation method of light calcium carbonate, solve the calcium carbonate produced by the traditio

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  • Preparation method of light calcium carbonate

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[0015] A kind of preparation method of light calcium carbonate, it comprises the steps:

[0016] (1) Crushing: Put the limestone raw material into the crusher for crushing;

[0017] (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;

[0018] (3) Calcination: place the screened and washed limestone in a vertical kiln for calcination, the calcination temperature is 900-1300°C, and the calcination time is 3-5 hours to produce quicklime (CaO) and carbon dioxide (CO2);

[0019] (4) Digestion: add quicklime generated by calcining limestone into hot water, the ratio of quicklime to hot water is 1:6, and the temperature of hot water is 90°C, stirring continuously to generate milk of lime;

[0020] (5) Pass the generated milk of lime through a 120-mesh sieve, and then filter the milk of lime to an effective CaO concentration of >170g / L;

[0021] (6) Causticizing: move t...

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Abstract

The invention discloses a preparation method of light calcium carbonate. The preparation method comprises the following steps: crushing a limestone raw material in a crusher; screening the crushed limestone, and washing the screened limestone by water; calcining the screened and washed limestone to generate quick lime (CaO) and carbon dioxide (CO2); digesting: adding the quick lime generated by calcining the limestone into hot water, and constantly stirring to generate lime milk; sieving the generated lime milk with a 120-mesh sieve, and concocting the lime milk by filtering till the effective CaO concentration is larger than 170g/ L; transferring the lime milk at the concocted concentration into a stirring reactor, causticizing by adding a NA2CO3 solution; inflating kiln gas CO2 into a causticized CaCO3 solution for carbonizing in a carbonizing tower; filtering, washing, drying and grinding a carbonized CaCO3 slurry to obtain a light calcium carbonate product. The light calcium carbonate prepared by the preparation method is relatively high in quality.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a preparation method of light calcium carbonate. Background technique [0002] Most of the existing methods for preparing light calcium carbonate are to use lime solution, and then carbon dioxide is introduced to carry out carbonization reaction, and then filtered, washed, and dried to obtain calcium carbonate, but the calcium carbonate produced by these traditional methods is mostly heavy calcium carbonate. As a filler, there are many impurities and the quality is not high. Contents of the invention [0003] The object of the present invention is to provide a kind of preparation method of light calcium carbonate, solve the calcium carbonate produced by the traditional method existing in above-mentioned existing preparation method mostly be heavy calcium carbonate, as filler impurity is many, the problem that quality is not high. [0004] It includes the following steps: [0...

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/18
Inventor 闫祖升
Owner 山西玉竹活性石灰制造有限公司
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