Dewatering High-clay Content Preparation Plant Tailings.
Min Cong J 1982 68(9):233-234
The U.S. Bureau of Mines, as part of its mission to eliminate health and safety hazards at the mine site, is developing alternate treatment and disposal methods for coal-clay waste. In the preparation of coal to produce low-ash material, a waste product containing fine coal and clay is generated. This waste product, generally minus 28 mesh in size, with the major portion being minus 325 mesh, is difficult to handle owing to the low settling of the fine clay particles. The material is usually processed in a thickener to produce a slurry containing about 30 percent (by weight) solids that is generally impounded behind earthen dams. It has been estimated that about 16 million tons of these waste solids are generated annually. Disposition of the slurries behind dams poses a potential health and safety hazard because of possible dam failure and because months and sometimes years are required for the slurry to settle and thicken naturally.
Min. Cong. J., V. 68, No. 9, Sept. 1982, PP. 233-234