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The influence of the induction and relaxation time of the deformed adsorption layer of the bubble on the stability of the wetting film is investigated theoretically and experimentally. It is shown that, during flotation by a mixture of dry air with the saturated water vapor (aerosol), the adherence selectivity increases due to stabilization of the wetting film. A method for computing the vapor flow rate during flotation with aerosol that does not require empirical information is developed.

To increase the technological characteristics of processing of the ores of the Urup deposit, the flow chart of stream flotation and a column flotation machine are applied to separate a rough concentrate in a second flotation stream. A vapor-air mixture with the addition of a foam former and oleic acid fed into the column through a pneumohydraulic aerator of the diffuser-confusor type is used as the gas phase during the column flotation.

Based on the laboratory studies of ore concentration and the statistical processing of the characteristics of operating a lead-zinc plant, it is established that obtaining a high-quality commercial lead concentrate is possible only after the additional reduction of the crude concentrate. It is proven that the characteristics of flotation increase as the content of metals in the starting ore increases. The revealed dependences are used in development of the technology of zinc removal from the lead concentrate to improve the characteristics of ore dressing. The idea of this technology is that the batch is prepared from the concentrate and the ore; the charge is ground in the ore mill and concentrated by the schematic of direct selective flotation. An increase in the quality of the lead concentrate is reached due to the opening of aggregates of galenite with sphalerite and pyrite. The increase in the characteristics of ore concentration is explained by an increase in the content of metals in feeding the flotation and by a decrease of the ratio of the zinc content to the lead- the zinc module. The commercial characteristics obtained as a result of industrial tests of the technology of zinc removal from the lead concentrate due to repeated flotation with the starting ore confirmed the high efficiency of the developed technology.