| Annotation |
The relevance of the work is determined by the importance of solving the problem of processing chromium-containing stored tailings, which represent a promising resource for increasing the production of chromium concentrate and reducing the environmental impact on the environment. The object of this study is the processing of chromium-containing tailings using flotation technology. The subject of the study is samples of stored tails of the Donskoy Mining and Processing Complex. The purpose of the research is to determine the optimal parameters of the flotation enrichment of the chromium-containing tailings. The main objectives of the research are to determine the rational interval of the fraction size of chromium-containing tailings, the processing of which by the flotation method would be effective from the point of view of obtaining a concentrate with acceptable recovery of a valuable component, and to determine the optimal collector consumption, ensuring the required final results of flotation enrichment in plane the recovery and quality of the chromium concentrate. To select rational enrichment modes, a method for optimizing the flotation enrichment of stored chromium-containing tailings has been applied, which is based on the use of a new economically oriented criterion - a function of the cost of non-recoverable metal and losses due to a decrease in the quality of the concentrate obtained (reduced chromium losses).The results of the conducted research are the optimal parameters of flotation enrichment of stored chromium-containing tailings. The optimal collector consumption has been determined, at which the lowest value of the reduced chromium losses is achieved. When using the selected collector flow rate, the Cr2O3 content is achieved in the range of 47–50 %, which corresponds to the M3 concentrate grade, subject to restrictions on the mass fraction of iron and silicon oxide. It is shown that the range of fineness of the tail fraction chosen for flotation enrichment, despite the different flotation capacity of individual fineness classes, does not require adjustment by additional grinding or additional desliming. The main conclusion from the conducted research is to substantiate the possibility and expediency of using flotation technology for processing stored chromium-containing tailings of a wide range of fineness, which makes it possible to obtain branded M3 concentrate with 72–76 % Cr2O3 recovery tailings using flotation technology.
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