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OXYETHYLATED COMPOUNDS AS REGULATORS OF SELECTIVE FLOTATION OF APATITE ORE
Abstract
Oxyethylated compounds are used as reagents-regulators in the flotation of non-sulfide ores, in particular, apatite ores. Thus, the necessary degree of selectivity in the flotation separation of two calcium minerals of apatite and calcite is achieved only by using, in addition to a collector, regulators-reagents from the nonylphenol ethoxylates class. In order to establish the most optimal structures, this paper presents a comparative assessment of the physical-chemical and flotation properties of several classes of oxyethylated compounds - alkylphenol ethoxylates, aliphatic alcohol ethoxylates and oxyethylated carboxylic acid. The addition of the studied compounds to the sodium oleate solution reduces its sensitivity to hardness ions. The values of CCM in the solutions of mixtures of nonionic compounds with sodium oleate indicate the formation of mixed micelles in the volume of the solution. The authors have studied their dispergating ability with respect to the air phase and calcium soaps of the carboxylic collector. It was shown that all classes of compounds with equal or close amounts of oxyethyl groups are characterized by approximately the same dispersing ability with respect to calcium oleate. More effective dispersion of air was observed in solutions of oxyethylated phenols and alcohols. The authors have analysed apatite hydrophobization under the influence of the studied compounds. The increase of hydrophobizing action of mixture of oleic acid and oxyethylated compounds was shown. The method of frothless flotation of minerals under desorption conditions was used to assess the strength of sodium oleate fixation on minerals. All considered ethoxylates influence on strength of fixing of the collector on minerals, and the collector in the presence of oxyethylated compounds is fixed more strongly on apatite, than on calcite. The influence of the considered classes of regulators on apatite flotation has been studied. The interrelation of flotation properties of oxyethylated compounds and their molecular structure has been established.
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