Yakutniproalmaz Institute, Mirny, Russia

E. G. Kovalenko, Chief Engineer, Candidate of Engineering Sciences, kovalenkoeg@gmail.ru
A. L. Babushkina, Head of Sector
V. A. Chut-Dy, Leading Production Engineer

The variations in the phase composition of a collector manufactured by mixing black oil fuel with medium- and low-molecular oil products and light oil are found. It is shown that formation of fine disperse and colloid solutions of high-molecular components improves adhesive activity and collectability of collectors based on black oil fuel F-5 in flotation of diamonds. It is determined that the increase in the temperature has a beneficial effect on transition of asphaltene–tarry fraction to a colloid and true solution in the medium- and low-molecular fractions. For enhancing collectability of collectors in froth separation of diamonds, it is proposed to compound black oil fuel F-5 with diesel fuel composed of low- and medium-molecular fractions of oil products, and with low oil with high total mass of such fractions. It is shown that the use of the compound collectors with black oil fuel F-5 ensures increased recovery of diamonds by 2.5–5 % at high selectivity of the process. The temperature intervals which enable maximal diamond recovery are determined for the operation of conditioning of diamond-bearing kimberlites with flotation agents and for the flotation itself. The optimized temperature mode selected for the frother separation of fine diamonds includes conditioning with flotation agents at 30–38 °C and frother separation at 14–24 °C. The selected mode is implemented owing to heat accumulated during thermal treatment of the frother separation feedstock.

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