Method for extracting lithium sulfate from lepidolite

Abstract

A method for extracting lithium sulfate from lepidolite is disclosed. The method adopts the lepidolite as a raw material and a roasting manner, and includes steps of crushing, material mixing, dryingand roasting stabilizer adding, and the like. The raw material and auxiliary materials are mixed, and the mixture is roasted in a rotary kiln device to achieve lithium sulfate extraction. During lepidolite roasting, a recovered by-product salt is added in place of potassium sulfate, a roasting additive that is ferric oxide powder is added during roasting so that the ferric oxide powder reacts andis bonded with silica in the lepidolite raw material, a stabilizer function is achieved, and a raw material phenomenon and an inner kiln blockage phenomenon are avoided, thus increasing utilization rates of lithium and lithium salts such as lithium sulfate extracted from the lepidolite. The production process is simple.

Description

Technical field: [0001] The invention relates to a method for extracting lithium sulfate, in particular a method for extracting lithium sulfate from lepidolite which is a lepidolite raw material. Background technique: [0002] With the national new energy development plan, lithium new energy is one of the key national support for the development of energy industries; lithium sulfate, as an important basic raw material for the development of lithium new energy development, has increasing production and demand, and its prices are getting higher and higher. [0003] Lepidolite is an important mineral resource, which is rich in rare metal materials, such as lithium, sodium, potassium, rubidium, cesium, and aluminum. With the increasingly tense world energy, the development and utilization of new energy is a common issue in the world. As one of the important industries in the development of new energy, lithium new energy has been paid more and more attention by all countries; lithium an...

AI Technical Summary

Problems solved by technology

However, there are disadvantages such as large material circulation, low equipment efficiency, high energy consumption, kiln knot phenomenon, and low metal recovery rate.

[0006] The second is that the lepidolite raw material is dissolved and calcined at high temperature for a long time, which increases the loss rate of rare metal materials in the lepidolite raw material and reduces the recovery rate of rare metals, especially lithium.

The leaching liquid-solid ratio of the roasted material is relatively small, and the corresponding stirring intensity is required to be high, but the conventional mixer is difficult to meet the requirements, which results in a low lithium extraction rate

On the other hand, the single calcination method and the stirring and mixing method of the leachate have a great influence on the lithium extraction yield of lepidolite, so how to provide a comprehensive and refined roasting method to roast lepidolite and processing, on the other hand, because a large amount of potassium sulfate is used as a roasting auxiliary material, because the production cost of using potassium sulfate as an auxiliary material is high, the cost of preparing lithium sulfate from lepidolite is virtually increased, thereby making the production process unsustainable

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