Method for leaching and enriching lithium elements in aluminum rocks by hydrofluoric acid

Abstract

The invention discloses a method for leaching and enriching lithium elements in aluminum rocks by hydrofluoric acid. The method comprises the following steps: the aluminum rocks are crushed to -0.074 mm; the hydrofluoric acid is adopted to stir and leach the lithium elements in the aluminum rocks; the stirring strength is 300 r / min; the concentration of the hydrofluoric acid is 5-17%; the liquid-solid ratio of the hydrofluoric acid to the aluminum rocks is 1: 4-1: 10; the reaction temperature is 25-75 DEG C; and the reaction time is 15 min. The method adopts the hydrofluoric acid as a leaching agent to effectively leach out and enrich lithium in the aluminum rocks; the lithium leaching rate reaches above 90%; the content of main impurity ions-aluminum ions in the leaching liquid is largely decreased; the impurity removing treatment of subsequent leaching liquid is facilitated; and the method has such advantages as high lithium leaching rate, low cost, simple operation and short leaching time.

Description

technical field [0001] The invention relates to a new method for extracting lithium in the field of hydrometallurgy, in particular to a method for leaching and enriching lithium in aluminum rocks with hydrofluoric acid. Background technique [0002] With the changes in the pattern of development and utilization of lithium resources, the lithium industry is facing the dilemma of resource depletion, low ore grade, and high processing costs. At present, the raw materials for extracting lithium are mainly lithium ore and salt lake brine. Scholars at home and abroad have conducted a lot of research on it, but there are few reports on the research on the extraction of lithium from alumina rocks. Aluminous rocks have large reserves, wide sources, and rich lithium resources, which have not been rationally developed and utilized at present. Using alumina rock to extract lithium can not only improve the comprehensive utilization value of alumina rock, but also has great significance ...

AI Technical Summary

Problems solved by technology

[0004] The patent application number of the Chinese patent literature is 201310037306X, the publication number is CN103131873, and the data named as the method of using mixed acid to separate the lithium element in the aluminum rock and prepare lithium carbonate discloses a new method for extracting the lithium element in the aluminum rock. The lithium element in the alumina rock was successfully separated and lithium carbonate was obtained by using cheap mixed acid, but it leached a large amount of aluminum ions while leaching lithium, which was not conducive to the removal of impurities