Process for preparing superfine light calcium carbonate

A technology of light calcium carbonate and equipment, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, addition of inorganic compounds, etc., can solve the problems affecting the application of light calcium carbonate, large particle size, wide particle size range, etc. , to achieve the effect of fine particle size, high whiteness and narrow particle size distribution
CN1884085AActive Publication Date: 2006-12-27SHANGHAI DONGSHENG NEW MATERIALS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI DONGSHENG NEW MATERIALS
Publication Date
2006-12-27

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Abstract

The invention discloses a preparing method of super-fine lightweight calcium carbonate, which comprises the following steps: adding disperser in the calcium hydroxide slurry; sending the slurry to the grinding equipment; inputting carbon dioxide from bottom of grinding equipment to carbonize; synchronizing grinding and carbonizing. The disperser is one or two of phosphate, sodium polyacrylate, triethanolamine, sodium pyrophosphate, sodium polyphosphate or hexametaphosphate. The even grain size of super-fine calcium carbonate is 0.2-2.0 mum with 60-100 percent grain number with less than 2 mum grain size, which is fit for paper making filler or paper coating dye.
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Description

technical field

[0001] The invention relates to a preparation method of ultrafine light calcium carbonate. Background technique

[0002] Light calcium carbonate is an important inorganic chemical raw material. The fineness of light calcium carbonate powder produced by ordinary carbonization method is generally about 400 mesh, the particle size is large, and the aggregation phenomenon between particles is serious, which affects the light calcium carbonate powder. Calcium application.

[0003] CN03115660.6 patent discloses a kind of preparation method of ultrafine light calcium carbonate, this patent adopts conventional dispersant, adopts the method for grinding ultrafine light calcium carbonate with about 400 mesh light calcium carbonate, therefore, this patent There is an obvious defect in the disclosed technology, and the ultrafine light calcium carbonate produced by it has a wide range of particle sizes and uneven distribution, and the prepared slurry has high viscosity a...

Claims

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