Lithium extraction process for spodumene magnetic material by sulfuric acid method

Abstract

The invention discloses a lithium extraction process for a spodumene magnetic material by a sulfuric acid method. The process comprises the following steps: I, putting the spodumene magnetic materialin a rotary kiln to be roasted at a high temperature and then naturally cooling and grinding the spodumene magnetic material into particles; II, screening iron powder by a magnetic separator and storing residual clinker; III, adding concentrated sulfuric acid into the clinker to be uniformly mixed, carrying out acidified roasting, adding calcium oxide into the mixture to leach a roasted product after dissolving the roasted product in a stirring tank out, and separating and washing the roasted product to obtain a lithium sulfate solution; IV, adding a sodium hydroxide saturated solution into the lithium sulfate solution, adjusting the ph, and carrying out precipitation and filtration to obtain a pure lithium hydroxide solution; V, evaporating and concentrating the pure lithium hydroxide solution to obtain a lithium hydroxide solution, the concentration of which is 20%, and then adding a sodium carbonate solution to obtain a lithium carbonate precipitate; and VI, filtering and washing the lithium carbonate precipitate and drying the lithium carbonate precipitate in vacuum to obtain a lithium carbonate product. The process provided by the invention is simple. Compared with lithium extraction by a sulfate method, the sulfuric acid method is more environment-friendly and sulfide gas which pollutes the environment is not generated.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a process for extracting lithium by a sulfuric acid method for spodumene magnetic materials. Background technique [0002] Spodumene belongs to the monoclinic crystal system, the crystals are often columnar, granular or plate-like, the color is off-white, gray-green, purple or yellow, etc., the hardness is 6.5-7, and the density is 3.03-3.22g / cm3. As the raw material of lithium chemical products, it is widely used in lithium chemical industry, glass and ceramic industries, and enjoys the reputation of "industrial monosodium glutamate". [0003] Due to the low content of iron and lithium in the flotation of spodumene, the magnetic materials cannot be comprehensively utilized and can only be discarded, which has a certain impact on the environment. [0004] Lithium extraction by sulfuric acid method refers to the lithium extraction method in which spodumene concentrate is p...

AI Technical Summary

Problems solved by technology

However, in the process of extracting lithium by the sulfate method, the production of sulfate will consume a large amount of potassium sulfate, which is costly and easily produces sulfide gas that pollutes the environment.

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