Using Calcium Carbide Slag as One of Calcium-Containing Raw Materials to Produce Cement Clinker

Abstract

Calcium carbide Slag is from CaC 2 hydrolysis reaction and will do harm to land and make pollution. Calcium carbide slag can be a substitute for limestone to produce clinker with a high portion of CaO as an excellent calcium raw material. As a kind of industrial wastes, the properties of calcium carbide slag differentiate from that of natural limestone. In the present investigation, the modern analysis methods of XRF, XRD, DTA/TG, petrographic analysis were used to compare carbide slag and limestone, and the results showed that the main chemical compositions of the calcium carbide slag were basically the same with that of natural limestone. Comparing with limestone materials, calcium carbide slag had a higher content of CaO, and the main mineral phase constituent of limestone was CaCO 3 , whereas the main mineral of calcium carbide slag was Ca (OH) 2 with a lower decomposition temperature. It has been found that under the same temperature the amount of C 3 S in the clinker of calcium carbide slag batching was slightly less than that of limestone batching.