First, step by step flotation
Ural area zinc copper mineral ore disseminated uneven, complex mineral composition, primary copper minerals have copper minerals, secondary copper minerals and copper oxide thereof, there are two variants of sphalerite, pyrite has multiple variants, this mineral belongs to the mineral hard stone. Russian ore dressing experts have developed a segmented grinding and step flotation process for this purpose. That is, the coarse-grained minerals are floated after the first and second coarse grinding, and the fine-grained minerals are floated after the third-stage grinding. Applying the natural floatability difference of minerals, first adding a small amount of selective collector to flotation of good floatable minerals without adding active agent, obtaining high quality concentrate, adding activator and strong collecting force Collector, flotation of weakly floating minerals, thereby increasing the overall process indicators. This is similar to the asynchronous flotation process proposed by China BGRIMM (Beijing Research Institute of Mining and Metallurgy). The use of this segmentation dissociation and step separation process effectively treated the copper-zinc ore of the Gaysk, Uchalinsk, Jackgarsk and "International 3" deposits in the Ural region.
2. Ion flotation, flotation extraction and electroflotation
Ð—Ð¾ÑƒÃ³Ð¾ÑƒÐ»Ð¸Ñ et al. studied the removal and recovery of cobalt from aqueous solutions and sewage by precipitation and flotation. After the cobalt ions are precipitated into CoS with sodium sulfide, the precipitate is floated in an acidic medium, and the maximum recovery of cobalt is about 70%. In an alkaline medium, cobalt forms a hydrogen oxyhydroxide (Co(OH) 2 ), which is floated and precipitated with dodecylamine as a collector. The recovery of cobalt is almost 100%.
In a solution adjusted to pH 3 to 3.5 with sulfuric acid, an amine is used as an extractant to extract molybdenum from a foam in an aqueous solution. Ammonium hydroxide is added to strip back and crystallize ammonium molybdate from the foam phase. The stripped aqueous and organic phases are returned to the foam extraction operation. Was added in a range of ~ 12 pH11 coal oil, froth flotation amine extraction with sulfuric acid the product tank was adjusted to pH 7 to 8, flotation purification, the organic phase was separated, the organic phase is returned, the product tank to the adsorption clarifier.
At pH 8.0 to 9.0, nickel was subjected to froth flotation extraction with naphthenic acid. When the molar ratio of naphthenic acid to nickel was 2.4 to 1.1, the recovery of nickel was the highest, being 99%.
Electrochemical electrochemical flotation and flotation - filtration of industrial waste water from the recovered non-ferrous metals, the former through the DC power to the cathode and anode through the water, the pH adjusted waste water, the metal ions form a hydroxide precipitate, while water electrolysis Air bubbles are generated and the hydroxide precipitate is removed by flotation. In the electrochemical flotation-filtration method, in addition to electrochemical flotation, activated carbon filtration is added to enhance the purification of sewage. At present, more than 50 industrial enterprises in Russia have used the technical data and electrochemical flotation equipment of this process.
As a precipitating agent was precipitated with fine pyrite copper ions from dilute aqueous solution, then dried over sodium dodecyl amine or cetyltrimethylammonium bromide as collector, at pH> 8 flotation pyrite The flotation recovery rate is higher than 80%, and the copper removal rate is 50%.The function of a quick-release valve is to rapidly exhaust air from the controlled device. It is normally located adjacent to the controlled device, rather than requiring exhaust air to return and exhaust through the control valve. This decreases release time.
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