A kind of method extracting lithium sulfate from lepidolite

Abstract

The invention discloses a method for extracting lithium sulfate from lepidolite, which uses lepidolite as a raw material, adopts a roasting method, including crushing, mixing, drying, adding a roasting stabilizer, etc. The method of roasting in the kiln device is used to extract lithium sulfate salt. In the process of roasting lepidolite, the salt of the recovered by-product is added to replace the addition of potassium sulfate. At the same time, roasting additives and iron oxide powder are added during roasting to make it and lithium The silicon oxide in the mica raw material is combined by reaction, and acts as a stabilizer so that the phenomenon of raw material and kiln formation will not occur, thereby improving the utilization rate of lithium extracted from lepidolite and lithium salts such as lithium sulfate. And the production process is simple.

Description

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

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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