RU95102021A - Method of clarification of mine inflow water and slime dewatering - Google Patents

Abstract

FIELD: mining; dewatering of minerals and clarification of process water; applicable in processing of minerals accumulating in slime ponds, and mineral recovery from mine water, and in hydraulic and hydromechanical coal mining. SUBSTANCE: the offered method is embodied by separation of initial slurry into slime water and slurry with slime coarse fraction, formation from coal slime in thickening-clarifying apparatus of filtering layer; direction of slime water for polarization of finely divided coal particles contained in it, and supply of slime water to thickening-clarifying apparatus to under filtering layer for clarification by filtering with simultaneous electric coagulation of particles of opposite charges of filtering layer and slime contained in water. Water clarified in thickening-clarifying apparatus is subjected to secondary polarization and mixed with overflow of thickening pulp collector and directed to contact vessel with filter dam from burnt rocks. Coal slime accumulating in thickening-clarifying apparatus is removed from apparatus in form thickened slurry which is subjected to secondary thickening in thickening pulp collector and dewatered in filtering centrifuge. EFFECT: higher quality of clarified water without use of chemical reagents, reduced moisture content in dewatered coal; produced coal concentrate features ash content of 8-10% and moisture content of 9-12%, recovered maximum amount of coal from mine water and reduced coal losses, cleaning of existing mine slime ponds without contamination of environment.

Claims (1)

The invention relates to mining, to dehydration of minerals and clarification of process water, can be used in the processing of minerals that accumulate in sludge settlers, and their extraction from mine water, as well as in underground coal mining by hydraulic and mechanohydraulic methods. The objective of the invention is to increase the intensity of the processes of clarification of water and dehydration of sludge. The proposed method is carried out by separating the initial slurry into sludge water and slurry with large fractions of sludge in the thickening-clarifying apparatus of the filtration layer, sending the slurry water to polarize the fine coal particles contained in it, and feeding it into the thickening-clarifying apparatus under the filter layer for clarification filtration with simultaneous electrogogulation of oppositely charged particles of the filtration layer and sludge contained in water. The water clarified in the thickening-clarifying apparatus is subjected to secondary polarization, after which it is mixed with the overflow of the thickening pulp collector and sent to a contact tank with a filtering dam from burnt rocks. Coal sludge accumulating in the thickening-lighting apparatus is removed from the apparatus in the form of a condensed slurry, subjected to secondary drying in a thickening pulp collector, and dehydrated in a filtering centrifuge. Using the proposed method allows to improve the quality of clarified water without the use of chemicals, to reduce the moisture of dehydrated coal, to obtain a coal concentrate with a salinity of 8 - 10% and a moisture content of 9 - 12%, to extract the maximum amount of coal from mine water and reduce its losses, to clean existing mine sediments without polluting the environment.