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Method for removing fluorine in lithium-mica ore neutral leaching solution by using aluminum-containing adsorbents

A technology of adsorbent and lepidolite, which is applied in the direction of separation method, chemical instrument and method, process efficiency improvement, etc., to achieve the effect of reducing cost, avoiding corrosion, and simple regeneration process

Active Publication Date: 2019-09-06
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 ore neutral leachate by using an aluminum-containing adsorbent. Add aluminum-containing adsorbents to the lithium mica neutral leach solution obtained by neutral leaching to separate fluorine from lithium carbonate products, thereby improving the performance of lithium carbonate products and meeting the requirements of downstream enterprises

Method used

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  • Method for removing fluorine in lithium-mica ore neutral leaching solution by using aluminum-containing adsorbents
  • Method for removing fluorine in lithium-mica ore neutral leaching solution by using aluminum-containing adsorbents

Examples

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Effect test

Embodiment 1

[0045] (1.1) Weigh 110gAl 2 (SO 4 ) 3 18H 2 O, dissolved in 200ml of deionized water, stirred rapidly to make it completely dissolved and placed on a magnetic stirrer.

[0046] (1.2) Add 100g / L NaOH solution dropwise to the aluminum sulfate solution at a constant speed, and measure its pH value in real time until the pH value of the solution reaches 6.2, stop the dropwise addition, and continue stirring for 12h.

[0047] (1.3) After stirring, vacuum filter, wash with deionized water until the pH value of the filtrate is the same as that of deionized water, and then filter again.

[0048] (1.4) The obtained filter cake was placed in a constant temperature drying oven, and dried at a constant temperature of 100°C. After it was completely dehydrated, it was ground and passed through a 160-mesh sieve to obtain an aluminum hydroxide adsorbent.

[0049] (2) Get 50ml lepidolite ore neutral leach solution, record its F - The concentration is 2.6×10 -3 mol / L, adjust the pH value ...

Embodiment 2

[0053] (1) Preparation of aluminum-containing adsorbent

[0054] (1.1) Weigh 110gAl 2 (SO 4 ) 3 18H 2 O, dissolved in 200ml of deionized water, stirred rapidly to make it completely dissolved and placed on a magnetic stirrer.

[0055] (1.2) Add 100g / L NaOH solution dropwise to the aluminum sulfate solution at a constant speed, and measure its pH value in real time until the pH value of the solution reaches 5.8, stop the dropwise addition, and continue stirring for 12 hours.

[0056] (1.3) After stirring, vacuum filter, wash with deionized water until the pH value of the filtrate is the same as that of deionized water, and then filter again.

[0057] (1.4) The obtained filter cake was placed in a constant temperature drying oven, and dried at a constant temperature of 100°C. After it was completely dehydrated, it was ground and passed through a 160-mesh sieve to obtain an aluminum hydroxide adsorbent.

[0058] (2) Get 50ml lepidolite ore neutral leach solution, record its ...

Embodiment 3

[0062] (1) Preparation of aluminum-containing adsorbent

[0063] (1.1) Weigh 110gAl 2 (SO 4 ) 3 18H 2 O, dissolved in 200ml of deionized water, stirred rapidly to make it completely dissolved and placed on a magnetic stirrer.

[0064] (1.2) Add 100g / L NaOH solution dropwise to the aluminum sulfate solution at a constant speed, and measure its pH value in real time until the pH value of the solution reaches 5.9, stop the dropwise addition, and continue stirring for 12h.

[0065] (1.3) After stirring, vacuum filter, wash with deionized water until the pH value of the filtrate is the same as that of deionized water, and then filter again.

[0066] (1.4) The obtained filter cake was placed in a constant temperature drying oven, and dried at a constant temperature of 100°C. After it was completely dehydrated, it was ground and passed through a 160-mesh sieve to obtain an aluminum hydroxide adsorbent.

[0067] (2) Get 50ml lepidolite ore neutral leach solution, record its F - ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B3/24B01J20/08B01J20/34
CPCB01J20/08B01J20/3433B01J20/3441B01J20/3475C22B3/24C22B26/12Y02P10/20
Inventor 王万林张华龙周乐君张海辉毛松薛利文张建康南进喜刘剑叶张同生黄道远
Owner CENT SOUTH UNIV
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