Purifying hazardous elements in Yiluo fine coal by dry high-gradient magnetic separation

摘要

Dry magnetic separation of different sizes of Yiluo fine coal was carried out to purify deleterious elements. It was found that dry magnetic separation can effectively reduce a variety of harmful trace elements in raw coal. Regardless of coal particle size, the rejection efficiency of Cd, Hg, As, and Mn is 39.07%-57.16%, 33.89%-49.94%, 30.49%-47.52%, and 27.10%-52.28%, respectively. Relatively high removal efficiency of Pb, Cu, and Se is obtained, which is 26.23%-35.32%, 27.25%-39.41%, and 25.05%-32.84%, respectively. Moreover, the results show that sulfur rejection of 33.87% and reductions in ash of 41.19% are obtained with particle size of 80-120 mesh, while the combustible recovery reaches 83.68%.