Synthesis and flotation activity of reagent-collectors based on dithiocarbonyl and phosphoryl derivatives of amino alcohols

Abstract

1JSC “A.B. Bekturov’s Institute of Chemical Sciences”, Almaty, Kazakhstan 2JSC “Institute of Metallurgy and Enrichment”, Almaty, Kazakhstan *E-mail: s-w07@bk.ru Research has been carried out to study flotation activity of new surface active substances among dithiocarbonyl and phosphoryl derivatives of monoethanolamine and diethanolamine on the gold-bearing sulphide ore of the Bestobinskoye deposit of Kazakhstan. Among the synthesized compounds, effective collectors for selective enrichment of sulfide polymetallic gold ores were found. Sodium N-octyl-N-2-hydroxyethyldithiocarbamate (AA-41) and sodium O-2-(dimethoxyphosphoryl2-hydroxyethylamino)ethylxanthate (GF-2) were proposed as new flotation reagents. They were tested in flotation of gold-bearing polymetallic ore as additional collectors contributing to an increase in percentage of gold extraction in the collective concentrate in comparison with the factory basic regime in which a mixture of butyl xanthate (BX) and ditiophosphate butyl ether or butyl airoflot (BAF) was used. The results of flotation tests indicate that collective ability of GF-2 in combination with BAF provides a higher gold recovery to the concentrate – 90.8%, than gold recovery with BX and BAF is (87.7%). It should be specially emphasized that consumption of GF-2 in comparison with BX is lower on 33%. Synthesis methods of the AA-41 and GF-2 flotation agents were developed, and evidence of their structure was given by IRS and NMR 1Н, 13С. The principal technological scheme of GF-2 obtaining was developed. In synthesis of collector AA-41, one of the principles of “green” chemistry “catalytic systems and processes (as selective as possible) are in all cases better than stoichiometric ones” was used. The use of tetrabutylammonium iodide as catalyst in synthesis allows shorten the reaction time, reduce reaction temperature and increase the selectivity.