A METHOD FOR PREPARING CACO3 USING EGG-SHELL

摘要

PURPOSE: A manufacturing method of calcium carbonate using waste egg shell is provided to maximize production effects of precipitated calcium carbonate. CONSTITUTION: A manufacturing method of calcium carbonate using waste egg shell comprises the following steps: painting waste egg shell which contains calcium carbonate and impurities(S110); suspending the paint processed waste egg shell in water(S210); first mixing ammonium chloride with the suspended egg shell(S310); obtaining filtrate in which calcium chloride (CaCl2) is dissolved by filtering the first mixed solution(S410); and precipitating calcium carbonate ((NH4) by secondary mixing ammonium carbonate with the filtrate(S510). In the first step, the reaction of equation(1) is progressed. The equation (1) is as follows: waste egg shell(CaCO3, impurities) ° CaO + CO2 + impurities. [Reference numerals] (S110) Painting waste egg shells; (S210) Suspending painted waste egg shell powder; (S310) Mixing ammonium chloride with the suspended solution; (S410) Filtering; (S510) Adding ammonium carbonate -> precipitating calcium carbonate