Research Institute of Comprehensive Exploitation of Mineral Resources, Moscow, Russia:

T. N. Matveeva, Head of Laboratory of Mineral Components Separation Theory, e-mail: tmatveyeva@mail.ru
L. B. Lantsova, Leading Engineer

This article shows the results of laboratory tests of modified diethyl dithiocarbamate as additional selective collector for gold minerals. Modified diethyl dithiocarbamate tests were carried out on goldsulfide ore sample in open flotation circuit for obtaining of concentrate and tailings. Xanthate substitution by reagent diethyl dithiocarbamate enhances the gold concentrates quality in content by 1.3–1.5 times and increases gold recovery by 7–10%, in comparison with the base reagent mode. Selective flotation of bulk concentrate was performed in the circuit of primary and control flotation for obtaining of two concentrates and tails. Application of diethyl dithiocarbamate thioester in selective flotation of gold-sulfide concentrate allows to improve gold pyrite and arsenopyrite separation selectivity and obtaining of Au – pyrite concentrates, containing 121.82–135 ppm of Au and less than 2% of As. This method allows to extract cheaper Au by pyrometallurgical method. At the same time, reduction of content of sparingly soluble pyrite and pyrrhotite in Au-arsenopyrite concentrate (containing more than 150 ppm of Au) leads to leaching time reduction, which provides the reduction in electricity costs. Pre-feasibility study for efficiency of implementation of new diethyl dithiocarbamate reagent showed its investment attractiveness: replacement of xanthate by diethyl dithiocarbamate reagent provides a significant increase in the gross profit of enterprise. Costs of new reagent will not exceed 1% of total economic impact. Additionally, solving of problem of selection pyrite and arsenopyrite with indigenous ores dressing will reduce the cost of gold extraction in subsequent separate processing of gold concentrates.
This work was carried out with the support of the grant of the President of Russian Federation “Scientific school of Academician V. A. Chanturiya” NSh-748.2014.5 (НШ-748.2014.5).

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