A method of using modified bentonite adsorbent to remove fluorine in lepidolite ore neutral leachate

Abstract

The invention discloses a method for removing fluorine in a lepidolite ore neutral leaching solution by using a modified bentonite adsorbent. The method is characterized by comprising the following steps of (1) uniformly mixing calcium-based bentonite, sulfuric acid and modifier poly- dodecyl trimethyl ammonium chloride, then carrying out reaction at 50-55 DEG C for 1-1.5 hours, after the reaction is finished, washing a reactant to be neutral, then filtering the reactant, and drying and activating obtained filter cake at 110-130 DEG C to prepare the modified bentonite adsorbent; and (2) adjusting the pH value of the neutral leaching solution of lepidolite ore to be 7.5-9, adding the modified bentonite adsorbent, so that the concentration of the neutral leaching solution is not lower than30g / L, and carrying out solid-liquid separation to obtain fluorine-loaded modified bentonite adsorbent solid and the defluorinated lepidolite leaching solution. The fluorine removal agent prepared through the method can effectively reduce the fluorine content in the lepidolite ore neutral leaching solution to reach the standard, the quality of a lithium carbonate product is directly improved, thecost is low, and the method has considerable social and economic values.

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 a modified bentonite 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 enterp...

Images