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Method for extracting lithium salt from salt lake bittern with low-magnesium-lithium ratio with calcium circulation solid phase conversion method

A phase inversion method and technology of salt lake brine, applied in the direction of lithium carbonate; Fine particle size of the product, etc., to achieve the effects of easy filtration and washing, improved recovery, and high selectivity

Active Publication Date: 2009-08-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in the precipitation method, the product particle size is fine, filtration is difficult, and lithium loss is large; the carbonization method is not easy to control, and the lithium yield is low; the calcination method has a low magnesium removal rate and high energy consumption; the adsorption method has low production efficiency due to low adsorbent capacity; Organic Solvent Extraction Causes Environmental Pollution in Salt Lake Area Due to Water Solubility of Organic Compounds

Method used

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  • Method for extracting lithium salt from salt lake bittern with low-magnesium-lithium ratio with calcium circulation solid phase conversion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A. Take low-magnesium-lithium-ratio salt lake brine and dehydrate and concentrate it. The contents of lithium and magnesium in the concentrated brine are 7.4g / L and 20.8g / L respectively; the temperature of the brine is 94°C.

[0047] B. Add water to the reactor (demagnesizing device) according to the liquid-solid ratio of 3:1, and stir; take quicklime (CaO) according to the CaO / Mg (mass ratio) of 2.8 and add it to the water in the demagnesizing reactor to form milk of lime.

[0048] C. The reactor is constantly stirred, and the hot concentrated brine is slowly added into the reactor; the reaction time of feeding is 180min.

[0049] D. Filtrate and wash while it is hot; the washing liquid is returned to prepare milk of lime; the temperature of the filtered solution (removed magnesium solution) is 62°C, and the main components (g / L) are: lithium 6.3, magnesium <0.1, calcium 29.5.

[0050] E. Add water to the reactor (decalcifier) ​​according to the liquid-solid ratio of 3...

Embodiment 2

[0055] A. Take low-magnesium-lithium-ratio salt lake brine and dehydrate and concentrate it. The contents of lithium and magnesium in the concentrated brine are 11.5g / L and 27.6g / L respectively; the temperature of the brine is 97°C.

[0056] B. Add water into the reactor (demagnesizing device) according to the liquid-solid ratio of 3:1, and stir; take quicklime (CaO) according to the CaO / Mg (mass ratio) of 2.5 and add it to the water in the demagnesizing reactor to form milk of lime.

[0057] C. The reactor is constantly stirred, and the hot concentrated brine is slowly added into the reactor; the reaction time of feeding is 120min.

[0058] D. Filtrate and wash while it is hot; the washing liquid is returned to prepare milk of lime; the temperature of the filtered solution (removed magnesium solution) is 68 ° C, and the main components (g / L) are: lithium 9.5, magnesium <0.1, calcium 38.0.

[0059] E. Add water to the reactor (decalcifier) ​​according to the liquid-solid ratio...

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Abstract

The invention relates to a method for extracting lithium salts from saline salt brine with a low magnesium-lithium ratio through a calcium cycling solid-phase conversion method. The method is to take the saline salt brine with the low magnesium-lithium ratio as a raw material and adopt the technological flows of brine concentration, magnesium and sulfur removal through lime cream, calcium separation through lithium carbonate, lithium extraction through sodium carbonate, thermal decomposition of calcium carbonate, hydration of quicklime into cream, and the like to extract lithium carbonate products. The main technical points of the method comprises that: the method is based on a solid-phase conversion principle of anions (OH, CO3) and realizes magnesium and calcium removal of the brine, purification of the lithium salts and closed cycle of calcium through solid-phase conversion of Ca(OH)2, Mg(OH)2, Li2CO3, Ca(OH)2, CaCO3, CaO, Ca(OH)2. The method comprehensively utilizes magnesium resources and lithium resources of saline lakes, has the characteristics of high magnesium removal efficiency, good purification effect of the lithium salts, high recovery rate of lithium and magnesium, low energy consumption, low cost, closed cycle of the calcium, small project investment, and the like, and is particularly suitable for industrial production on a large scale. In addition, the whole process is simple, clean and environment-friendly.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy, and in particular relates to a process for extracting lithium salt from salt lake brine, in particular to a method for extracting lithium salt from salt lake brine with a low magnesium-to-lithium ratio. Background technique [0002] Lithium is an important non-ferrous metal, known as "the energy metal of the 21st century". It is widely used in many high-tech fields such as energy and aviation, and occupies an extremely important position in the global economy. Global lithium resources can be divided into five types, namely pegmatite lithium, brine lithium, seawater lithium, hot spring lithium, and accumulated lithium ore. Currently, the lithium resources mined and utilized are mainly pegmatite lithium ore and brine lithium ore. Most of the current global lithium consumption comes from lithium brine mines. [0003] At present, the key technology for extracting lithium from salt lake bri...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01F11/18C22B7/006C22B26/22C22B26/12C01D15/08C22B3/44C01F5/22Y02P10/20
Inventor 胡启阳李新海王志兴郭华军
Owner CENT SOUTH UNIV
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