Method of obtaining calcium ions from lime by treating the lime with a polyhydroxy compound

摘要

A method of obtaining a solution of calcium ions from lime, comprising: (i) Treating the lime with an aqueous solution of a polyhydroxy compound of the formula HOCH2(CHOH)nCH2OH (where n is 1 to 6); and (ii) Optionally separating insoluble impurities from the solution resulting from (i). Also described is a method of producing a precipitated calcium carbonate from carbide lime, comprising: (i) Treating the carbide lime with an aqueous solution of sorbitol to extract calcium from the carbide lime; (ii) Separating the insoluble impurities from the solution resulting from (i); and (iii) Treating the solution resulting from (ii) with carbon dioxide.