DefinePK

Abstract

The research purpose is experimental studying of technological regimes of lithium-containing compounds manufacture using water of Kazakhstan salty Priaral’ye lakes. First of all, the brine’s chemical composition and impurity content were preliminary determined. Change of the precipitation yield depending on the extraction time, volume of the extracted raw material was studied and the optimum parameters of obtaining a lithium concentrate from the brine was determined. The purification process of the lithium concentrates from??2+, ?g2+ and other metals ions was investigated. Effective methods of the brine’s purification and sedimentation of lithium as lithium carbonate are suggested. The experimental results show, that the purification degree of lithium chloride concentrate by a lime-soda method makes 99,9 %. The four-component mixture formed at the lithium chloride cleaning and consisting of magnesium hydroxide, calcium borate, barium sulphate and calcium carbonate acts as a precipitator of heavy metals - lead, arsenic, zinc, copper and cadmium. It was established, that the optimum ratio of brine:butanol:SAS is 1:3:0,015-0,020; in this case the precipitate mass is 0,47-0,48 g. The lithium transition degree into the extract makes 96,7-98,9 %. The extraction technique of lithium chloride recovery from the brine and processing of lithium-containing concentrates proves the efficiency of the methods of lithium carbonate obtaining and its purification from ??2+, ?g2+ ions and other metals.