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Utilization method of chloride type salt lake brine

A salt lake brine and chloride technology, applied in lithium carbonate;/acid carbonate and other directions, can solve the problems of inability to achieve sustainable production, improve product purity, and high sodium content

Inactive Publication Date: 2012-05-02
JIANGSU HAILONG LITHIUM IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the current preparation method is difficult to further improve the product purity, so it is difficult to meet the requirements of some ultra-high purity applications such as pharmaceuticals, catalysts and atomic energy industries.
Moreover, sodium carbonate will bring in a large amount of sodium ions as a precipitant, and a large amount of water will be consumed for removal. The sodium content in the product is relatively high, and a large amount of sodium chloride waste liquid will be produced at the same time, which cannot achieve sustainable production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Chloride-type salt lake brine stock solution, the main components are (g / l):

[0050] LiCl – 8.7, NaCl – 177, KCl – 37.4, MgCl 2 – 44.5, CaCl 2 – 3.31, SO 4 2- – 3.1.

[0051] Evaporate and concentrate under sunlight, and precipitate impurity salts NaCl, KCl, CaSO when reaching saturation 4 and MgCl 2 ·6H 2 O, get lithium chloride concentrate after filtering off the precipitate, the composition is (g / l): LiCl – 252, NaCl – 2.2, KCl – 0.5, MgCl 2 – 62.4, CaCl 2 – 1.1, SO 4 2- – 0.3.

[0052] Heat 1000 ml of concentrate to 80°C, add a stoichiometric amount (relative to the amount of magnesium ions and calcium ions) of lithium carbonate and mix for 1 hour to remove most of the magnesium and calcium ions in the concentrate, and filter out the resulting MgCO 3 and CaCO 3 precipitation. The concentration of LiCl in the filtrate rises to 305g / l, and the remaining MgCl 2 and CaCl 2 4.1 g / l and 0.12 g / l, respectively. Add 3.19g Ca(OH) 2 and 4.68g Na 2 CO...

Embodiment 2

[0059] High magnesium lithium ratio chloride type salt lake brine, the main components are (g / l):

[0060] LiCl-2.2, MgCl 2 – 486, NaCl – 2.1, KCl – 2.4, CaCl 2 – 1.3, SO 4 2- – 1.1.

[0061] Put 11 liters into the adsorption-desorption column, the main component is LiCl 2Al(OH) 3 ·nH 2 The granular adsorbent of O acts with 45 liters of brine in the filtered state. After the adsorbent adsorbs lithium chloride to a saturated state, use a lithium chloride aqueous solution with a concentration of 5g / l to flush out the salt solution from the adsorption-desorption column, and then treat and desorb lithium chloride with distilled water to obtain the initial concentration of lithium chloride Liquid 14.8 liters, composition (g / l): LiCl – 6.2, MgCl 2 – 6.8, NaCl 2 4 2- < 0.05.

[0062] Carry out evaporation concentration and removal of impurity ions to the above-mentioned primary concentrated solution with the similar process of Example 1, obtain the lithium chloride con...

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PUM

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Abstract

The invention discloses a utilization method of chloride type salt lake brine for extracting ultra-high purity lithium carbonate. The method comprises taking chloride type salt lake brine as original solution, preparing lithium chloride concentrated solution by evaporation and concentration, purifying, using ammonium bicarbonate water slurry to precipitate lithium carbonate, dispersing by ultrasonic and washing lithium carbonate, then converting into lithium bicarbonate solution, centrifugally separating and decarbonizing to obtain the ultra-high purity lithium carbonate. By modification to the conventional technical processes and parameters and without the introduction of additional expensive purification steps such as ion exchange resin / membrane, the product purity can reach 99.999wt% and the main impurity total amount will not exceed 0.001wt%.

Description

[0001] technical field [0002] The invention relates to a mineral resource utilization process, in particular to a method for extracting ultra-high-purity lithium carbonate from chloride-type salt lake brine. [0003] Background technique [0004] Lithium is an important strategic resource, which mainly exists in nature in two forms of solid minerals and liquid minerals, among which lithium reserves in salt lake brine account for 69% of the world's reserves. Lithium carbonate is the most critical product in the lithium industry. It can not only be used to make ceramics, medicines, catalysts, etc., but also the basic material for the production of secondary lithium salts and lithium metal. Extracting lithium from salt lake brine is the key technology for obtaining lithium carbonate. [0005] Many methods for extracting lithium carbonate from salt lake brine have been disclosed in the prior art. These methods mainly include the steps of concentrating salt solution, removin...

Claims

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Application Information

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IPC IPC(8): C01D15/08
Inventor 丽亚伯采夫亚历山大德米特里维奇吉达列恩科瓦列里伊万诺维奇美热列丝拉丽萨吉毛费耶娃库拉科夫亚历山大亚历山大洛维奇古希娜叶丽扎维塔别特洛夫娜考祖巴拉娜达丽娅巴夫洛夫娜
Owner JIANGSU HAILONG LITHIUM IND TECH
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