Title: Method for preparation of hydrocarbon calcium carbonate by acid decomposition reclaiming circulation
Application Number: 93109486 Application Date: 1993.07.31
Publication Number: 1098382 Publication Date: 1995.02.08
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C01B7/05,C01C1/02,C01F11/18
Applicant(s) Name: Lin Feng Address: 650216
Inventor(s) Name:
Attorney & Agent: ZHANG YI SUN YUEHONG
Abstract:
     The present invention relates to a preparation method of calcium carbonate. The method described by said invention consists of following procedures: A. decomposing limestone by using hydrochloric acid; B. refining calcium chloride to remove impurity; C. absorbing carbon dioxide to prepare ammonium carbonate; D. synthetizing light calcium carbonate; E. tail liquid regeneration to prepare ammonia water and hydrochloric acid. The invented method directly uses limestone as raw material, and has no need of procedures of calcination and digestion. The invented product light calcium carbonate is up to the standard of GB4794-84, and its product whiteness is more than 90, and its cost is low.
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