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A MINING-INDUSTRIAL WASTE WATER TREATMENT TECHNOLOGY: JUSTIFICATION OF PARAMETRES USING COMPUTER SIMULATION
Abstract
Most methods of mining waste water treatment require significant costs for the construction and operation of tailings. Their area is calculated from the sedimentation time of impurities and suspended particles. The paper shows that an effective way of mining waste water treatment is flocculation of impurities and suspended particles and the subsequent flotation of the resulting flocs. Based on the results obtained, the Mining Institute KSC RAS has developed a technology for mining waste water treatment, including coagulation, sorption and flotation of flocs of impurities and suspended particles in activated water dispersions of air (AWDA). The AWDA use is based on the interaction of formed floccules of impurities and suspended particles with air bubbles, on the surface of which a heteropolar surfactant layer is formed before they enter the working volume of the flotation machine. Thus, a feature of flotation in AWDA is the interaction of flotation units with the activated surface of air bubbles, which leads to the formation of strong flotation complexes. A computer simulation of coagulation and aggregation of fine particles in the technological process of mining waste water treatment from dissolved impurities was carried out. Modeling made it possible to reveal the kinetics of sorption of pollutant components by the surface of the formed colloidal particles of iron hydroxide, the size and lifetime of the flocs. The advantages of the developed treatment technology include the exclusion of preliminary sedimentation of impurities and suspended particles, reduction of waste volumes, the possibility of achieving MPC values for a number of harmful components that are in both suspended and dissociated state. The technology has been tested at the enterprises of the Kola mining complex: JSC Lovozersky GOK and JSC Kovdorsky GOK.
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