Method and system for reprocessing high carbon coal fly ash to produce cementitious materials

摘要

pThe invention provides a system and method of thermally processing high carbon coal fly ash to produce hydraulically reactive or pozzolanic supplemental cementitious material (SCM) and synthesis gas. In this 'ash to energy and cement' (ATEC) process coal fly ash and ancillary fuels are fed into a thermal reactor along with oxide materials such as limestone. Carbon in the ancillary fuel and in the coal fly ash is converted to synthesis gas that is combusted to generate steam or electricity. The remaining low carbon ash and bed material exits the thermal reactor chamber and is further processed at high temperature in a kiln or slagging unit to produce partially fused nodules or clinker. The nodules or clinker are cooled and ground to a desired fineness for use as a cementitious materials. The ATEC process effectively converts high carbon coal fly ash waste to energy and value added SCM./p