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Method for extracting lithium from lithium-contained low-magnesium brine

A technology for extracting lithium and low magnesium, applied in the field of lithium extraction, can solve the problems of low lithium comprehensive yield, long production cycle, poor adaptability of brine, etc., and achieve high recycling rate, small amount of waste residue, and environmental friendliness

Inactive Publication Date: 2020-05-12
YIDING SHANGHAI INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solar pool method is suitable for lithium carbonate type salt lakes. The production cost of this method is low, but the comprehensive yield of lithium is low, the production cycle is long, and the product quality is poor
The solvent extraction method uses less fresh water, less investment in equipment and materials, and less power consumption, but the current solvent extraction technology is only applicable to Mg 2+ Old brine with high concentration, for low Mg 2+ Poor adaptability to concentrated brine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The main composition of raw brine in Jiezechaka Salt Lake, Tibet, China (g / L): Li, 0.17; Mg, 0.3; Na, 39; K, 2.3; SO 4 2- , 2.8; Ca, 0.004; Cl, ​​58; CO 3 2- , 2.06. In order to reduce the cost of extracting lithium in the present invention, the method for evaporating the original brine of Jiezechaka increases the concentration of lithium in the brine to form old brine, which is mainly composed of (g / L): Li, 0.5; Mg, 0.1; Na, 121; K, 10.3; SO 4 2- , 12.8; Ca, 0.004; Cl, ​​180; CO 3 2- , 8.61.

[0047] Take 1700g Na 2 CO 3 (excess 10%), add 7.2L of water and stir, then slowly add 814g of CaO, heat up to 80°C, continue stirring for 5h, stop stirring, filter to obtain 6.1 L of alkaline solution containing 184g / L NaOH, and obtain 1962g of aqueous CaCO 3 solid, CaCO 3 The solid was dried at 150°C and then calcined to obtain 850 g of a solid whose main component was CaO.

[0048] Take 5.0L of the above-mentioned old brine, add 215mL of filtered alkaline solution c...

Embodiment 2

[0050] The main composition of raw brine in Longmu Co Salt Lake in Tibet, China (g / L): Li, 0.13; Mg, 11.33; Na, 30; K, 3; SO 4 2- , 6.42; Ca, 0.3; Cl, ​​78. Use the adsorption method of aluminum-based adsorbent to remove magnesium and concentrate lithium to prepare a desorption solution containing lithium and low magnesium. The main composition of the desorption solution is (g / L): Li, 0.3; Mg, 0.3; Na, 0.8; K, 0.08; SO 4 2- , 0.17; Ca, 0.008; Cl, ​​3.6. Then the desorption solution is further reversed osmosis to obtain a concentrated solution containing lithium and low magnesium. The concentrated solution is mainly composed of (g / L): Li, 2.1; Mg, 2.1; Na, 5.6; K, 0.56; SO 4 2- , 1.19; Ca, 0.056; Cl, ​​25.2.

[0051] Take 1430gNa 2 CO 3 (over 20%), add 4.0L of water and stir, then slowly add 630g of CaO, continue stirring at 40°C for 24h, stop stirring, filter to obtain 3.68L of alkaline solution containing 220g / L NaOH, and obtain 1355g of aqueous CaCO 3 solid, CaCO 3...

Embodiment 3

[0054] A kind of salt lake brine, the main composition of the brine obtained after evaporation and concentration in the salt pan is (g / L): Li, 1.5; Mg, 4.8; Na, 92; K, 4; SO 4 2- , 34.

[0055] Get the old bittern after 10L concentrates, add the alkali solution 0.7L containing NaOH after the filtration that prepares among the embodiment 2, separate out basic magnesium carbonate and Mg(OH) respectively 2 Precipitation, Mg and Ca in the solution are all less than 0.2ppm (ICP-AES inspection limit), pH=12.3. Filtration, separation and removal of basic magnesium carbonate and Mg(OH) 2 Precipitate, then use the composite extractant formed by mixing TBP and LIX84, control the volume ratio of TBP and LIX84 to 0.2:1, compared with A / O=1:1, continuous two-stage countercurrent extraction at room temperature, the Li extraction rate is 98.4% , Na, K and other impurities extraction rate 2 The gas was introduced into the system and stirred for 30 minutes, Li was back-extracted to the wate...

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Abstract

The invention provides a method for extracting lithium from lithium-contained low-magnesium brine, and relates to the technical field of chemical extraction and chemical engineering. The method comprises the steps that: CaO, water and excessive Na2CO3 are mixed for reaction, and obtained reaction liquid is filtered to obtain alkali solution and a CaCO3 solid; the alkali solution is fed in the lithium-contained low-magnesium brine, the pH of the lithium-contained low-magnesium brine is gradually adjusted above 11, and alkaline magnesium carbonate and Mg(OH)2 precipitate are separated out to obtain lithium-contained brine after removal of magnesium; a composite organic extracting system is adopted to extract lithium from the lithium-contained brine after removal of magnesium to obtain a loaded organic phase and raffinate; the loaded organic phase is mixed with acid water solution; and lithium in the loaded organic phase is reversely extracted to a water phase so as to obtain lithium-contained water solution and a lithium-removed organic phase. The method provided by the invention can extract lithium from the lithium-contained low-magnesium brine, and is high in yield and purity of lithium, low in cost, low in investment and high in material recycling rate.

Description

technical field [0001] The invention relates to the technical fields of extraction chemistry and chemical industry, in particular to a method for extracting lithium from lithium-containing low-magnesium brine. Background technique [0002] Lithium is the metal with the smallest density and is widely used in batteries, grease, electronics and pharmaceuticals. In recent years, the wide application of lithium-ion batteries has promoted the rapid growth of lithium demand. The annual consumption of lithium is 20% The speed of left and right increases. [0003] Lithium resources mainly exist in salt lakes. 85% of lithium resources in my country exist in salt lakes, and ore resources only account for 15%. The key issue in lithium extraction from salt lakes is how to separate lithium ions from complex brines. In the prior art, the processes for extracting lithium from brine include calcination method, adsorption method, membrane separation method, solar pond method, and solvent ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B3/26C22B26/12
CPCC22B3/44C22B26/12C22B3/26Y02P10/20
Inventor 刘丽慧林佳静张如歌
Owner YIDING SHANGHAI INFORMATION TECH CO LTD
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