Calculation of Forming Heat of Cement Clinker Made from Calcium Carbide Slag

Abstract

Calcium carbide slag can be a substitute for the natural limestone to produce cement clinker and also with a high portion of CaO as an excellent calcium raw material. Thus, it not only reduces the pollution that the calcium carbide slag brings to the environment, but also reduces the exploitation of non-renewable resource-limestone. The main mineral constituent of calcium carbide slag is Ca(OH)2,and there are many differences in decomposition temperatures between the calcium containing raw materials. When calcium carbide Slag is added, the forming process of cement clinker and the major reactions happened in that process changes. The empirical equation for calculating forming heat of cement clinker made of limestone is no longer applied for those made of calcium carbide slag. In this paper, the empirical equation for forming heat calculation of calcium carbide slag added cement clinker is researched and rebuilt under the principles of thermodynamics. Results show that the change of raw materials has a great influence on the forming heat of cement clinker. When the traditional raw materials are replaced by calcium carbide slag, the forming heat of cement clinker will be reduced. Calculating the forming heat by the revised empirical equation can help reduce errors and make calculation results near the reality and then convenient for evaluation of heat efficiency. The work provides some theoretical underpinnings for the process analysis and calculation of forming heat of cement clinker made from calcium carbide slag.