Abstract
The results of studies on the development of a technology for the extraction of fluorite concentrates from finely disseminated refractory technogenic raw materials from Primorsky deposits were presented. The account of the technological features of the stale tailings of the concentration plant of Yaroslavkaya Mining Company has been given. The necessity of fine grinding of the material and careful selection of reagent compositions providing the required flotation selectivity has been substantiated. The fundamental possibility of obtaining fluorite concentrates containing CaF2 up to 94% and more using several samples of collectors from the group of fatty acids has been established. Fatty acids of tall oil produced by Ust-Ilimsk timber processing complex and a mixture of fatty acids produced in India, branded MASOIL 1880, provide a sufficient level of flotation selectivity. The recovery of fluorite in an open enrichment cycle according to the scheme with seven cleanings of the foam product can be 61.85-63.84%. The use of collectors compositions promotes an increase in the selectivity of the adsorption of reagents, which is accompanied by an increase in the selectivity of their action in comparison with the results obtained with the dosage of certain brands of the tested reagents into the flotation process. The extraction of fluorite into a concentrate obtained using a combination of tall oil and MASOIL-S fatty acids in a 1:1 ratio was 59.55-66.27% with a content of 95.6-94.23% CaF2 in it, respectively.
Highlights
The basis for achieving high selectivity in the flotation of refractory ores is a rational selection of reagent compositions
A series of experiments on the enrichment of technogenic tailings using an open flotation circuit and tall oil fatty acids (TOFA) as a collector has shown the possibility of stable production of fluorite concentrates containing 93% CaF2 and higher with fluorite recovery of no more than 5862%
Continuously increasing requirements for the quality of fluorite concentrates and, at the same time, the shortage of highly selective fatty acids in the Russian market suggest the need to assess the prospects for expanding the range of efficient collectors that provide the highest level of selection of hard-to-separate minerals
Summary
The basis for achieving high selectivity in the flotation of refractory ores is a rational selection of reagent compositions. When enriching calcium-containing mineral raw materials, including fluorite ores, carboxylic compounds of various nature are used as collectors. The most effective of them are mixtures of unsaturated fatty acids, the range of which is quite wide on the Russian and world markets. For ores containing minerals similar in flotation properties, a careful analysis of the characteristics of the collectors used and their combinations is required. The development of a technology for extracting fluorite from complex, including technogenic, raw materials requires an analysis of the technological properties of reagents with different structures of hydrocarbon radicals, which makes it possible to assess their adsorption characteristics under conditions of a liquid phase of pulp that is non-uniform in salt composition and physicochemical properties.
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