Method for separating lithium concentrate transformation roasting material before acidification or alkalization

Abstract

The invention relates to the technical field of new energy lithium materials, in particular to a method for separating a lithium concentrate transformation roasting material before acidification or alkalization. The method comprises the following steps: S1, roasting: putting lithium concentrate into a roasting furnace, increasing the temperature to 1000-1100 DEG C, and carrying out sintering for 0.5-1 hour so as to obtain a roasted material; and S2, crushing and separating: crushing and separating the roasted material obtained in the step S1 through a crushing and separating system, wherein fine powder which passes through a 150-mesh sieve serves as beta-type lithium fine stone powder for lithium salt production and coarse powder which is left on the 150-mesh sieve serves as lithium-containing feldspar powder. According to the method, the airflow crushing and separating system is utilized, so that not only the grinding effect but also the separating effect can be achieved; 65% of the lithium-containing feldspar powder in the roasted material can be separated out and can no longer participate in an acidification or alkalization reaction; a lot of expenses can be reduced; the grade of the separated beta-type lithium fine stone powder can be improved and the fineness can reach 150 meshes or above; and the lithium metal recovery rate can reach 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 separating lithium concentrate transformed roasting material before acidification or alkalization. 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 generally c...

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 traditional process, consumes a lot of acid, alkali, and labor costs, turning precious resources into "solid waste" (the only application of these "solid waste" is to give cement plants As a filler, 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 the production cost is too high

[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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