Process for extracting lithium from lithium pyroxene concentrate by using fluorine chemistry

Abstract

The invention provides a process for extracting lithium from lithium pyroxene concentrate by using fluorine chemistry. The process comprises the following steps of: firstly, uniformly mixing raw materials, such as alpha-lithium pyroxene concentrate powder, an additive and sulfuric acid according to weight ratio of 1:(0.1-2):(0.5-5); secondly, feeding the uniformly-mixed raw materials into a reactor and finishing the reaction and timely extracting gas generated in the reaction process; thirdly, leaching reaction slag retained in the reactor with water and carrying out solid-liquid separation on the reaction slag to obtain a sulfate solution and remove ionic impurities in the solution, such as potassium, sodium, aluminum, magnesium, calcium, ferrum and the like; and fourthly, after the impurities are filtered, concentrating residual solution to obtain a precipitation containing lithium ions, filtering to obtain a rough lithium salt product and producing refined lithium salt according to the requirement. The process disclosed by the invention has the advantages of low reaction temperature, low production energy consumption and high lithium extraction rate; the lithium can be directly extracted from alpha-lithium pyroxene without crystal form transformation; and various valuable components of the lithium pyroxene can be integrally utilized while the lithium salt is produced.

Description

technical field [0001] The invention relates to the technical field of extracting lithium from ores, and more specifically to a process for chemically extracting lithium from spodumene concentrate with fluorine. Background technique [0002] Lithium and lithium salts have been expanded from traditional application fields such as glass ceramics, electrolytic aluminum, grease, refrigeration, etc. to high-tech fields such as aluminum-lithium alloys, lithium batteries, nuclear fusion, etc., especially the explosive potential of new energy for high-efficiency batteries. The increase in demand poses an urgent challenge to the technological progress of the lithium salt industry. Research on new lithium mineral extraction technology is of great significance to the development of new energy sources in the world. [0003] At present, the main raw materials for extracting lithium are salt lake brine and solid lithium minerals. China has abundant reserves of lepidolite and spodumene. T...

AI Technical Summary

Problems solved by technology

These methods all carry out high-temperature calcination of lithium minerals, and then use different methods to process the calcined slag to further produce lithium salts, which have high production costs, high energy consumption, low lithium extraction rate, and large amounts of waste residues.