СИРЕК МЕТАЛДАР ӨНДІРІСІНІҢ ҚАЛДЫҚТАРЫНАН ЛИТИЙ АЛУ ТӘСІЛІ

Abstract

The invention relates to the field of lithium metallurgy, in particular to methods for extracting lithium from waste from tailings dumps of rare metal production. A method for extracting lithium from rare metal production waste, including sulfatization of lithium-containing tailings in a mixture with 93% sulfuric acid at a temperature of 300°C, a solid:liquid ratio of 6:1 (sulfuric acid consumption of 0.17 ml / g) and a duration of 1 hour, with subsequent aqueous leaching of the sulfate cake, whereby prior to sulfatization, preliminary high-temperature calcination of the tailings at 1000-1350°C is excluded, then, after sulfatization, the resulting sulfate cake is leached with water at a temperature of 90°C, a solid:liquid ratio of 1:10, and a duration of 0.5-2 hours. The technical result achieved by the proposed invention is a reduction in energy consumption due to the elimination of the high-temperature calcination operation at 1000-1350°C, while ensuring a high degree of lithium extraction into the solution of 98.7%.