NUST MISIS (Moscow, Russia):

Pestryak I. V., Acting Head of Chair, Associate Professor, Candidate of Engineering Sciences, spestryak@mail.ru
Morozov V. V., Professor, Doctor of Engineering Sciences, Professor, dchmggu@mail.ru

The conditions have been established for attaching the ionic molecular forms of fatty acids, introduced with the recycled waters, to the surface of calcium and magnesium-containing rock-forming minerals (calcite and sericite) during grinding and bulk copper-molybdenum flotation. Using the results of a thermodynamic analysis of the surface state, the concentrations of oleate ions have been determined that are sufficient for the hydrophobization of calcium and magnesium-containing minerals under grinding and flotation conditions. It has been shown that calcium oleate is attached to the surfaces of calcite and magnesium-containing sericite in an alkaline medium. The results of flotation studies confirm the possibility of preventing the recovery of rock-forming minerals into bulk concentrate. The maximum permissible concentration of oleates in recycled water has been selected, which dictates the required degree of water treatment. In order to achieve the best recycled water conditioning, the principle of the most complete mutual binding of heavy metal ions and fatty acid components with the deposition of metal oleates was used. The test results confirm the possibility of reducing the concentration of oleate ions in the recycled water to less than 1 mg/l. The flotation process using the selected conditioning technology for TSF filtrates, wastewater from urban sewage treatment plants and CHP ash dump discharge water allowed increasing the recovery of copper and molybdenum by 0.7–0.8 % relative to the design process that envisages the discharge of all wastewater directly into the tailings storage facility. The results obtained served as the basis for the application of the low-reagent technology for joint conditioning of heavily contaminated waters at the concentrator of Erdenet GOK.

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