In addition to the high temperature calcination method there is no other?
Preparation of calcium carbonate limestone is a purification process, because the limestone mixed with magnesium carbonate, zinc carbonate and other impurities. So the first use of excess dissolved in hydrochloric acid, cooling and filtering, adding an excess of sodium carbonate in the filtrate, let the calcium ion in the form calcium re dissolved, filtered, and then thoroughly washed with distilled water residue, the residue is relatively pure calcium carbonate.
Hydrochloric acid dissolved, filtered, adding sodium carbonate solution, precipitation, and then aging, the final filtration, washing precipitation, you can get pure calcium carbonate.
