Production method of porous calcium carbonate

Abstract

The preparation method of porous calcium carbonate includes the folloiwng steps: preparing calcium chloride aqueous solution and ammonium hydrogen carbonate aqueous solution, adding crystal habit correcting agent whose adding quantity is 0.01-0.05% of total mass of the above-mentioned two solutions; mixing them at 25-30 deg.C, fully stirring at normal pressure until the air is reacted, settling reaction product for 0.5-1 hr., separating sediment calcium carbonate from ammonium hydride solution, then washing said sediment calcium carbonate by using water, dewatering, drying so as to obtain the porous calcium carbonate product with strong adsorption force and penetrating quality. It can be extensively used in the industries of plastics paper-making, paint, printing ink and domestic chemicals, etc.

Description

technical field The present invention relates to the preparation method of compound calcium carbonate, particularly the production method of porous calcium carbonate. Background technique At present, there are more than 300 large and small enterprises producing industrial precipitated light calcium carbonate in my country, mainly producing spindle-shaped light calcium with an average particle size of about 3.5 μm and a density of about 2.4-2.6 g / cm 3 . Due to the inherent defects in this light calcium carbonate performance, such as the deficiencies in aspects such as high density and poor adsorption force, it greatly affects the scope of use of calcium carbonate and the quality of synthetic products. And the market needs a density of 1.6-1.9g / cm 3 , a porous amorphous calcium carbonate crystal with a particle size of 1-10 μm, but there are no reported documents so far, and there is no such product. Contents of the invention The purpose of this invention is to provide ...

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Problems solved by technology

Due to the inherent defects in the performance of this light calcium carbonate, such as high density, poor adsorption force, etc., it greatly affects the scope of use of calcium carbonate and the quality of synthetic products.

And the market needs a density of 1.6-1.9g / cm 3 , a porous amorphous calcium carbonate crystal with a particle size of 1-10 μm, but has not been reported in the literature so far, and there is no such product

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