PREPARATION METHOD OF PORTLAND CEMENT USING FINE POWDER DISCHARGED FROM PULVERIZATION PROCESS IN THE RECYCLING OF WASTE CONCRETE AND PRODUCT THEREOF

摘要

PURPOSE: A method for preparing Portland cement by using the waste concrete fine powder and Portland cement prepared by the method are provided, to obtain Portland cement by using the dust discharged in the heating pulverization process of the preparation of waste concrete recycled aggregate. CONSTITUTION: The method comprises the steps of drying and pulverizing silicon oxide, aluminum oxide, iron oxide, calcium oxide, magnesium oxide and potassium oxide to prepare a source material; mixing the obtained source material with limestone, pumice, converter slag, fly ash and waste concrete fine powder; drying the mixture and calcining the dried one at a temperature of 800-1,000 deg.C for 1-2 hours for decarboxylation; and calcining the obtained one at a temperature of 1,450 deg.C or more for 1-2 hours. Preferably the content of the waste concrete fine powder is 1.50-7.74 wt%.