Method for removing fluorine in lepidolite ore neutral leaching solution by using modified bentonite adsorbent

A technology of bentonite and adsorbent, which is applied in the field of rare metal hydrometallurgy to achieve the effect of reducing cost, avoiding corrosion and large specific surface area

Active Publication Date: 2019-08-16
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems caused by the presence of fluorine in the existing technology of producing lithium carbonate from lepidolite, the present invention provides a method for removing fluorine in lepidolite neutral leachate by using modified bentonite adsorbent. Add modified bentonite adsorbent to the lepidolite neutral leachate obtained by leaching to separate fluorine from lithium carbonate products, thereby improving the performance of lithium carbonate products and meeting the requirements of downstream enterprises; and desorb and regenerate the adsorbed adsorbent, thereby reducing costs

Method used

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  • Method for removing fluorine in lepidolite ore neutral leaching solution by using modified bentonite adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Accurately weigh 50g of calcium-based bentonite and place it in 100ml of 2.5mol / L H 2 SO 4 In a beaker, measure 20ml polybehenyltrimethylammonium chloride and add it into the beaker; slowly stir the obtained solution system in a constant temperature water bath at 53°C for 1h; after the stirring is completed, vacuum filter , washed with deionized water, until the pH value of the filtrate is the same as that of deionized water, and then suction filtered again; the obtained filter cake was placed in a constant temperature drying oven, and dried at a constant temperature of 120°C to activate it. After it was completely dehydrated, it was ground and passed 160 mesh sieves, obtained modified bentonite adsorbent;

[0030] (2) Get 50ml lepidolite ore neutral leach solution, record its F - The concentration is 1.06×10 -2 mol / L, adjust the pH value of the water to 7.5, add 1.5g of modified bentonite adsorbent, shake in a constant temperature water bath at 25°C for 25min, t...

Embodiment 2

[0032] (1) Accurately weigh 50g of calcium-based bentonite and place it in 100ml of 2.5mol / L H 2 SO 4 In a beaker, measure 20ml polybehenyltrimethylammonium chloride and add it into the beaker; slowly stir the obtained solution system in a constant temperature water bath at 53°C for 1h; after the stirring is completed, vacuum filter , washed with deionized water, until the pH value of the filtrate is the same as that of deionized water, and then suction filtered again; the obtained filter cake was placed in a constant temperature drying oven, and dried at a constant temperature of 120°C to activate it. After it was completely dehydrated, it was ground and passed 160 mesh sieves, obtained modified bentonite adsorbent;

[0033] (2) Get 50ml lepidolite ore neutral leach solution, record its F - The concentration is 1.06×10 -2 mol / L, adjust the pH value of the water to 8.5, add 1.5g of modified bentonite adsorbent, shake in a constant temperature water bath at 25°C for 25min, t...

Embodiment 3

[0035] (1) Accurately weigh 50g of calcium-based bentonite and place it in 100ml of 2.5mol / L H 2 SO 4 In a beaker, measure 20ml polybehenyltrimethylammonium chloride and add it into the beaker; slowly stir the obtained solution system in a constant temperature water bath at 53°C for 1h; after the stirring is completed, vacuum filter , washed with deionized water until the pH value of the filtrate is the same as that of deionized water, and then suction filtered again; the obtained filter cake was placed in a constant temperature drying oven, and dried at a constant temperature of 120°C to activate it. After it was completely dehydrated, it was ground and passed 160 mesh sieves, obtained modified bentonite adsorbent;

[0036] (2) Get 50ml lepidolite ore neutral leach solution, record its F - The concentration is 1.06×10 -2 mol / L, adjust the pH value of the water to 8.5, add 2g of modified bentonite adsorbent, shake in a constant temperature water bath at 25°C for 25min, then...

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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...

Claims

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Application Information

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IPC IPC(8): C22B3/24C22B26/12
CPCC22B3/24C22B26/12Y02P10/20
Inventor 王万林张华龙周乐君张海辉张建康毛松薛利文南进喜刘剑叶张同生黄道远
Owner CENT SOUTH UNIV
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