Calcium carbonate

Description

Calcium carbonate is a chemical compound, with the chemical formula CaCO3. It is a common substance found as rock in all parts of the world, and is the main component of shells of marine organisms, snails, and eggshells. Calcium carbonate is the active ingredient in agricultural lime, and is usually the principal cause of hard water. It is commonly used medicinally as a calcium supplement or as an antacid. precipitated calcium carbonate item of indexes index high-class product first-rate product salable product content of main component(CaCO3) ï&frac*4;… *8.0—**0.0 *7.0—**0.0 *7.0—**0.0 PH value 8.***0.0 8.***0.5 8.***1.0 content of volatile substance at **5℃ ï&frac*4;… ≥ 0.4 0.*0 1.*0 content of insoluble substance in hydrochloric acid ï&frac*4;… ≤ 0.*0 0.*0 0.*0 precipitated volume ml/g ≥ 2.8 2.6 2.4 content of iron (calculated in Fe) ï&frac*4;… ≤ 0.*8 0.*0 0.*0 manganese (calculated in Mn) ï&frac*4;… ≤ 0.**6 0.**8 0.**0 sieve residue **5umtest sieveï&frac*4;…≤ 0.**5 0.**0 0.**5 *5umtest sieve ï&frac*4;…≤ 0.*0 0.*0 0.*0 whiteness ℃ ≥ *0.0 *0.0 —