THE BEHAVIOR OF HEAVY METAL, ALKALI AND CHLORIDE DERIVED FROM WASTE SLUDGE ON THE MANUFACTURE OF ORDINARY PORTLAND CEMENT

摘要

The purpose of this study is to use the waste sludges generated at Pohang Iron & Steel Co. Ltd. (POSCO) by the raw materials of ordinary portland cement (OPC). To evaluate the possibility of its application, in this study, it was investigated that the behavior of heavy metal, alkali and chloride generated from waste sludge of steel making industry when it is used as raw mixture for cement. The waste sludge was mainly composed of CaO, SiO_2, Al_2O_3, and Fe_2O_3, similar as the main component of OPC. It was reported that alkali and chloride occur various troubles in the kiln, and heavy metals affected the properties of cement clinkers. This study discussed the hazardous effects by them and the characteristic of cement manufactured from waste by POSCO sludge. From the result of study, it was concluded that POSCO sludge can be used as the source materials of iron and calcium oxide in the maunfacture of cement.