Method for preparing lithium salt by separating lithium concentrate roasting material and then acidifying or alkalizing roasting material

Abstract

The invention relates to the technical field of new energy lithium materials, in particular to a method for preparing lithium salt by separating a lithium concentrate roasting material and then acidifying or alkalizing the roasting material. The lithium salt is prepared by roasting, dispersing and separating spodumene ore and then acidifying or alkalizing the spodumene ore; the dispersion is to disperse the roasting material into fine powder of 150 meshes or below and coarse powder of 150 meshes or above through mechanical grinding, high-speed stirring or airflow crushing, wherein the fine powder is beta-type lithium concentrate powder for lithium salt production; the coarse powder is lithium-containing feldspar powder; and the separation is to separate the fine powder from the coarse powder, only the fine powder of 150 meshes or below is subjected to acidification or alkalization reaction to prepare the lithium salt, and the coarse powder of 150 meshes or above is used as a byproduct for other purposes. According to the method, 65% of lithium-containing feldspar powder in the roasting material is separated out and does not participate in acidification or alkalization reaction any more, so that a large amount of cost is saved, the grade of the separated beta-type lithium concentrate powder is improved, the fineness is 150 meshes or above, and the lithium metal recovery rate reaches 85% or above.

Description

technical field [0001] The invention relates to the technical field of new energy lithium materials, in particular to a method for preparing lithium salts by separating lithium concentrate roasting material and then acidifying or alkalizing. Background technique [0002] Lithium is a rare and precious metal with very little reserves in nature. Lithium oxide content in domestic spodumene raw ore is 0.8-1.4%, mainly produced in lithium-rich granite pegmatite. Among them, the paragenetic minerals include quartz, albite, microcline, etc., as long as the chemical composition is: Li 2 O.AL 2 o 3 , SiO 2 and Na + , Mg 2+ , Ca 2+ 、K + , Fe 2+ , Mn 2+ , Zn 2+ Trace ions such as ions cannot be used directly under normal conditions, and the Li in the raw ore must be 2 O undergoes crystal transformation, that is, the monoclinic α-type is transformed into the tetragonal β-type, so that effective chemical reactions can be carried out. This high-temperature calcined mineral is...

AI Technical Summary

Problems solved by technology

The treatment of the above solid wastes puts enterprises under enormous cost pressure! Market competitiveness is greatly reduced

In particular, the leaching slag produced by lithium salts, due to the use of traditional techniques, consumes a large amount of acid, alkali, and labor costs, turning precious resources into "solid waste" (the general application of these "solid wastes" is to give cement plants As a filling material, it basically loses its economic value), using chemical methods to remove impurities is simple, practical and effective, but a large amount of useless slag participates in the reaction, and there is no benefit except to increase production costs

[0004] It can be seen that the existing lithium salt production process has technical problems such as large environmental pollution caused by solid waste and high production cost.

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