Study on feasibility of recovery of pyritic sulphur from coal refuse through flotation process

With an aim to turning the coal refuse at Danhou Coal Mine,Weixian,Hebei Province into a resource for utilization,on the basis of the analysis of the refuse and the separating technologies currently available,tests are made on the feasibility to recover pyritic sulphur from the refuse. Testing result indicates that,when treating a pre- deslimed feed using a closed- circuit flotation process composed of one rougher and 2- stage cleaner cells,a flotation concentrate with a yield of 10. 19%,a sulphur content of 39. 67% and a recovery rate of 82. 50% can be obtained under the following conditions: fineness of ground refuse- 60%; p H of feed pulp- 6- 6. 5; dosage of copper sulphur- 500 g/t; dosage of butyl xanthate- 400 g/t; and dosage of 2^# oil- 45 g/t. AS evidenced by separating result and technological indices,it is feasible to recover pyritic sulphur from refuse using flotation process.