A kind of method that uses aluminum-containing adsorbent to remove fluorine in lepidolite ore neutral leachate

Abstract

The invention relates to a method for removing fluorine in a lithium-mica ore neutral leaching solution by using aluminum-containing adsorbents, and belongs to the technical field of rare metal hydrometallurgy. The method disclosed by the invention comprises the following steps that the PH value of the lithium mica leaching solution is adjusted to 4.0-9.5 at 10-35 DEG C; appropriate amount of aluminum-containing adsorbents is added, so that the concentration of aluminum-containing adsorbents reaches 28-32 g / L, and the aluminum-containing adsorbents are continuously stirred for 15-45 min; thefluorine-loaded aluminum-containing adsorbents solid and a defluorinated lithium mica leaching solution are obtained through the solid-liquid separation; and the PH value of the aluminum-containing adsorbents is strictly controlled to 5.8-6.2 during preparation of the aluminum-containing adsorbents. The fluorine removal agent prepared by the method can effectively reduce the fluorine content in the lithium mica ore leaching liquid to reach the standard, the quality of the lithium carbonate product is directly improved, the cost is low, the method has considerable social and economic values; meanwhile, the aluminum-containing adsorbents are simple to regenerate, and the performance of the regenerated product is far superior to that of an existing product.

Description

technical field

[0001] The invention belongs to the technical field of rare metal hydrometallurgy, and in particular relates to a method for removing fluorine in lepidolite neutral leachate by using an aluminum-containing adsorbent. Background technique

[0002] Yichun City, Jiangxi Province has the reputation of the Lithium Capital of Asia. It has the largest lepidolite mine in the country, and the proven Li 2 The O reserves amount to 1.1 million tons, and it has not yet been effectively developed and utilized on a large scale. In recent years, the lithium battery industry has been booming. With the reduction of spodumene reserves, the effective development and utilization of lepidolite, a mineral resource, can alleviate the tense domestic lithium battery market.

[0003] Due to its own chemical composition, lithium carbonate products produced by lepidolite have the problem of high fluorine content. Lithium carbonate products cannot meet the requirements of downstream ente...

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