Desulfurization Process of High-sulfur Coal by Full-flotation

摘要

The coal sample from the Shijiazhai mine located in the east of Yunnan province of China, is characterized with high ash and sulfur content which are 64.90% and 8.66% respectively. Analysis results indicate that coal and pyrite are the valuable minerals that can be recycled from the crude ore. According to the properties of the ore, a full-flotation flowsheet is proposed to process the ore. The coal is separated by depressing the pyrite firstly, then the pyrite is activated and flotated. Based on the regulating of reagent scheme and flowsheet process, the optimum small-scale closed circuit experiment is conducted to obtain a coal concentrate with a yield of 37.18%, assaying 41.10% C and 5.38% S at a C recovery of 83.05%, and a S concentrate with a yield of 6.18%, assaying 9.04% C and 42.49% S at a S recovery of 30.56%, which could provide technical support for the building of the plant.