Solid-liquid Separations of Slurries Obtained from the Leaching of Phosphatic Clay Wastes.
Davis-JG; Wilemon-GM; Scheiner-BJ
Fluid/particle Separation J 1990 Dec; 3(4):196-200
The U.S. Bureau of Mines has studied the extraction of phosphate values from fine-particle wastes generated during conventional mining and beneficiation of phosphate ore. Investigations have centered on leaching dried wastes using sulfuric acid (h2so4) in the presence of methanol. Separation of insoluble gangue from desired leach liquor in these slurries is challenging because of the fine grain size of the unleached residues. Vacuum filtrations of the slurries yield filter cakes that are tight and difficult to wash, resulting in a loss of product and handling problems. A combination of flocculating agents has been discovered that enhances the settling properties of the solids in these slurries, facilitating solid-liquid separation. The effects of parameters such as polymer dosage and order of mixing on the efficiency of flocculation and settling are discussed.
Fluid/particle Separation J., V. 3, No. 4, Dec. 1990, PP. 196-200