Method for preparing superthin light calcium carbonate using plaster as raw material

Abstract

A process for preparing the superfine light-weight calcium carbonate from gypsum includes such steps as adding ammonia water to gypsum slurry or not, adding surfactant or not, adding soluble carbonate or dicarbonate, stirring or grinding, filtering, washing, and drying.

Description

Technical field:

[0001] The invention relates to a method for preparing superfine light calcium carbonate by using gypsum as a raw material. Background technique:

[0002] Ultra-fine light calcium carbonate is a new type of ultra-fine solid material developed in the late 1980s. As an inorganic filler, it has been widely used in industrial products such as rubber, plastics, papermaking, coatings, and inks. The main method of industrial production of light calcium carbonate is to pass CO in lime milk 2 Gas is prepared by carbonization reaction.

[0003] At present, my country's industrial by-products of phosphogypsum, desulphurized gypsum, citrate gypsum and fluorogypsum have been increasing year by year. Due to the fact that they have not been fully utilized, they have accumulated and become one of the huge amount of industrial solid waste in my country.

[0004] Some companies used phosphogypsum to react with ammonia water and ammonium bicarbonate to produce the target product am...