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Lithium-enriching method and device for desalinizing lithium-poor brine

A brine and lithium-poor technology, applied in chemical instruments and methods, lithium compounds, energy input, etc., can solve the problems of difficulty in promotion and high energy consumption, and achieve the effects of easy collection, low energy consumption, and reduced energy consumption

Active Publication Date: 2019-09-03
西安金藏膜环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the introduction of high-temperature steam, which consumes a lot of energy and is not easy to popularize.

Method used

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  • Lithium-enriching method and device for desalinizing lithium-poor brine
  • Lithium-enriching method and device for desalinizing lithium-poor brine
  • Lithium-enriching method and device for desalinizing lithium-poor brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A lithium-deficient brine [Mg 2+ ]=104.5g / L, [Li + ]=0.19g / L, the ratio of magnesium to lithium is 550:1 by mass ratio.

[0045] First, the lithium-poor brine is sprayed and evaporated through a spray-type atomization concentration and salt separation device, and the lithium-poor brine precipitates mixed crystals of potassium, sodium, and magnesium in a supersaturated state. Plate and frame filter press for solid-liquid separation. Lithium-rich intercrystalline water is collected. Jet atomized concentrated brine [Mg 2+ ]=110.3g / L, [Li + ]=0.89g / L.

[0046] The spray-type atomization concentration salt separation concentrated brine is diluted 1 times as nanofiltration raw water and enters the three-stage high-pressure nanofiltration circulation salt separation system to reduce salt, remove magnesium, and enrich lithium. The nanofiltration concentrated water at all levels is returned to the feed of the jet atomization concentration and salt separation device. Nanof...

Embodiment 2

[0049] A lithium-deficient brine [Mg 2+ ]=76.88g / L, [Li + ]=0.083g / L, the ratio of magnesium to lithium is 927:1 by mass ratio.

[0050] First, the lithium-poor brine is sprayed and evaporated through a spray-type atomization concentration and salt separation device, and the lithium-poor brine precipitates mixed crystals of potassium, sodium, and magnesium in a supersaturated state. Plate and frame filter press for solid-liquid separation. Collect lithium-rich intercrystalline water, that is, jet atomized concentrated brine. Jet atomization concentrated brine [Mg 2+ ]=113.8g / L, [Li + ]=0.32g / L.

[0051] Jet atomized concentrated brine is diluted 1 times as nanofiltration raw water and enters the five-stage high-pressure nanofiltration circulation salt separation system to reduce salt, remove magnesium, and enrich lithium. The nanofiltration concentrated water at all levels is discharged. Nanofiltration product water [Mg 2+ ]=5.29g / L, [Li + ]=0.35g / L.

[0052] The wat...

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Abstract

The invention discloses a Li-poor brine salt removing and Li enriching method and device. The method comprises the following steps: separating out K-Na-Mg mixed salt by forcibly performing spray evaporation on Li-poor brine in a raw water tank, and respectively obtaining Li-rich intercrystalline water and mixed crystal through plate-frame pressure filtration and solid-liquid separation; diluting concentrated brine, and respectively obtaining high-magnesium Li-poor concentrated water and low-salt nanofiltration water with low Mg-Li mass ratio through cyclic nanofiltration; performing reinforcedspraying, intermittent salt discharging and circulated concentration on the nanofiltration water to finally obtain high-concentration Li-rich water; and draining a solution of which the Li concentration in nanofiltration concentrated water is lower than 0.01 g / L, and reflowing the solution of which the concentration is higher than 0.01 g / L in the raw water tank to be mixed and reused with the Li-poor brine. The method and the device can continuously and circularly evaporate, concentrate and remove salt, is low in energy consumption and high in efficiency, reduces the raw material cost and theenergy consumption, can effectively improve the recovery rate of Li in the brine, and is simple in process flow and easy to operate, and the concentrated brine is easy to collect.

Description

technical field [0001] The invention relates to a process for enriching and concentrating lithium from salt lake brine, in particular to a method and a device for reducing salt and enriching lithium from lithium-poor brine. Background technique [0002] With the rapid development of new energy and new material industries, the development of lithium energy has received extensive attention. my country's salt lakes are rich in resources, and the industrial reserves of lithium are about 3.2 million tons. Adsorption, extraction, precipitation and other methods are relatively mature methods for separating and enriching lithium. Salt lakes in my country generally have the characteristics of high magnesium-lithium ratio (by mass ratio) and low lithium content, which greatly limits the extraction efficiency of lithium in salt lake brine. [0003] The traditional brine concentration technology uses solar energy to evaporate and concentrate brine by drying in salt pans. This method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/00C01D3/06
CPCC01D3/06C01D15/00Y02P20/10Y02P20/129
Inventor 王磊刘婷婷李陈陈立成黄丹曦吕永涛王旭东
Owner 西安金藏膜环保科技有限公司
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