Abstract:
An improved process for the beneficiation of coal and the separation of impurities therefrom comprising subjecting coal to surface treatment by contact with an aqueous medium comprising polymerizable monomer, polymerization catalyst and liquid organic carrier, thereby rendering said coal hydrophobic and oleophilic, the improvement comprising the high shear intermixing of the surface treated coal with at least one water wash medium thereby providing for the removal of further hydrophilic impurities, such as mineral ash from the coal. Apparatus for carrying out the process and the products prepared therefrom are also provided.
Abstract:
A method of beneficiating a phosphate ore containing silica and an alkaline earth metal carbonate impurity, particularly dolomite or calcite. The steps include testing the ore for excessive levels of carbonate impurities, the use of conventional flotation steps to remove silica, grinding the ore to a particle size in which at least 90% of the ore particles are less than 0.355 mm and thereafter reagentizing the ground phosphate containing ore with water, a carbonate collector, a phosphate depressant and a pH regulator to obtain a flotation feed having a solids level of about 20-30% and a pH of about 5.6-6.0. The flotation feed is then subjected to a reverse flotation in a flotation cell to remove carbonate impurities as the cell overflow and to collect a phosphate concentration as the cell underflow.
Abstract:
Flotation of fluorite from calcareous gangue with a fatty acid collector in an aqueous alkaline ore pulp is improved by adding an alkali metal bisulfite salt or an alkali metal thiosulfate salt before adding the collector.