Method for preparing high-white ness nano calcium carbide

Abstract

The invention is a method of preparing high-whiteness degree nano CaCO3. It uses limestone, CaCO3 content>98%, whiteness degree>92% as raw material, washes to calcine into CaO, then adds in the cleaned hot water to get Ca(OH)2, prepares milk of lime by purifying, the concentration 2-10%, uses the cleaned flue gas of CaCO3, calcinations as CO2 source, makes the solution of milk of lime react with CO2 in special synthesis reactor, and adds in crystal-shaped controlling agent to control the time, temperature and stirring speed of the reaction, and after the reaction is finished, makes filtration, drying and depolymerization on the solution. The whole course adopts the technique of controlling whiteness degree.

Description

Technical field

[0001] The invention belongs to the technical field of chemical industry. Background technique

[0002] Calcium carbonate is rich in raw materials and cheap in price. It is widely used in industries such as rubber, plastics, papermaking, coatings, inks, medicine, and daily chemicals. Nano-calcium carbonate not only retains the properties of raw calcium carbonate, but also has the characteristics of nanoparticles. Therefore, it is highly valued by people. Nano-calcium carbonate refers to the product of chemically synthesized calcium carbonate whose particle size is within the range of 0-100nm. At present, the particle size of domestic ultrafine activated calcium carbonate products can only reach about 100nm, and the particle size distribution is wide; the whiteness of the product is below 95%; the preparation method is inefficient and the preparation process is long, which is difficult to meet the market demand.

[0003] Due to the excellent performance and ...

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