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CUBIC PRECIPITATED CALCIUM CARBONATE PREPARED BY APPLYING CARBONATION METHOD TO LIMESTONE SLUDGE GENERATED FROM IRONWORKS AND PREPARATION METHOD THEREOF
CUBIC PRECIPITATED CALCIUM CARBONATE PREPARED BY APPLYING CARBONATION METHOD TO LIMESTONE SLUDGE GENERATED FROM IRONWORKS AND PREPARATION METHOD THEREOF
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机译：碳法将铁加工产生的石灰石渣制备成立方晶格碳酸钙及其制备方法
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摘要
PURPOSE: A method for preparing a cubic precipitated calcium carbonate and a cubic precipitated calcium carbonate prepared by the method are provided, to obtain a cubic precipitated calcium carbonate having a size of 0.1-0.9 micrometers with a low cost by using limestone sludge. CONSTITUTION: The method comprises the steps of calcining the limestone sludge whose quicklime (calcium oxide) content is 45-55 wt% at a constant temperature for a specific time; pulverizing the calcined lime; mixing the quicklime powder with water to hydrate it; filtering the obtained slaked lime (calcium hydroxide) suspension, drying the filtered one at a temperature of about 95 deg.C and washing the dried one; blowing out carbon dioxide to the calcium hydroxide suspension; and filtering and drying the calcium carbonate obtained by the carbonation to prepare a cubic precipitated calcium carbonate. Preferably the calcination is carried out at 1,000-1,200 deg.C for 1-3 hours; the calcined lime is pulverized into a size of 200 mesh or less; the suspension has a concentration of 4.0-8.0 wt%, the flow rate of carbon dioxide is 0.2-2.0 L/min and a stirring velocity is 500-1,000 rpm in the carbonation; and the carbonation is carried out at 10-20 deg.C.
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