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Process and device for preparing lithium carbonate from carbonic acid type brine

A technology of lithium carbonate and carbonic acid type, applied in lithium carbonate;/acid carbonate, improvement of process efficiency, membrane technology, etc., can solve the problem of long lithium extraction cycle, low product purity, low lithium yield, etc. problems, achieve the effect of shortening the lithium extraction cycle, improving the lithium recovery rate, and no environmental hazards

Pending Publication Date: 2022-03-04
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's Zabuye Salt Lake adopts the process of "winter storage of brine-multi-stage freezing and solarization-solar pool heating and sinking lithium", and has formed an annual production capacity of 3,000 tons of lithium carbonate. This method is simple to operate and low in cost, but there is a lithium yield. Low, need to build salt fields, long lithium extraction cycle, low product purity, and it is difficult to quickly expand production capacity, etc.

Method used

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  • Process and device for preparing lithium carbonate from carbonic acid type brine
  • Process and device for preparing lithium carbonate from carbonic acid type brine

Examples

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Embodiment 1

[0065] This embodiment provides a process for preparing lithium carbonate from a carbonated salt lake brine. The brine used is a carbonate-type brine from a certain salt lake in Tibet. The main ions in the original brine are lithium ions, sodium ions, magnesium ions, boron elements and carbonate radicals. The ion concentrations are 0.30g / L, 44.0g / L, 0.08g / L, 0.6g / L and 18.9g / L respectively, combining figure 1 Shown is the flow process of this embodiment, the method of this embodiment includes the following steps:

[0066] The above-mentioned carbonated salt lake brine is sent to a pretreatment multi-media filter to filter and remove some mechanical impurities such as sediment to obtain pretreated brine.

[0067] The brine after the pretreatment is sent to a device equipped with a titanium-based adsorbent. After the adsorption is completed, 0.3mol / L sulfuric acid is used for analysis and desorption to obtain the adsorption tail brine and lithium-containing analysis solution. Th...

Embodiment 2

[0072] This embodiment provides a process for preparing lithium carbonate from a carbonated salt lake brine. The brine used is a carbonate-type brine from a certain salt lake in Tibet. The main ions in the original brine are lithium ions, sodium ions, magnesium ions, boron elements and carbonate radicals. The ion concentrations are 0.81g / L, 142g / L, 0.1g / L, 3g / L and 28.9g / L respectively, combining figure 1 Shown is the flow process of this embodiment, the method of this embodiment includes the following steps:

[0073] The above-mentioned carbonated salt lake brine is sent to a pretreatment multi-media filter to filter and remove some mechanical impurities such as sediment to obtain pretreated brine.

[0074] The brine after pretreatment is sent to a device equipped with a titanium-based adsorbent. After the adsorption is completed, 0.4mol / L sulfuric acid is used for analysis and desorption to obtain the adsorption tail brine and lithium-containing analysis solution. The concen...

Embodiment 3

[0079] The brine used in this embodiment is a certain salt lake lithium sinking mother liquor, the concentration of main ion lithium ion, sodium ion and carbonate ion in this mother liquor is respectively 1.81g / L, 32.5g / L and 18.9g / L, combining figure 1 Shown is the flow process of the present embodiment, and other conditions are identical with embodiment 2, obtain lithium carbonate product purity and reach 99.5%.

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Abstract

The invention relates to a technology for extracting lithium from salt lake brine, in particular to a technology for extracting lithium carbonate from carbonate type salt lake brine. The carbonate type brine is treated and contains more carbonate ions, carbonate in the tail brine is fully utilized and adsorbed to serve as a carbon source in the lithium carbonate preparation process, and sodium carbonate does not need to be additionally added for reaction; in the lithium precipitation reaction process, the bipolar membrane technology is used for treating the lithium precipitation mother liquor to obtain acid and alkali, the acid is used for adsorbent desorption, and the alkali is used for lithium precipitation reaction and adsorption, so that a closed cycle of the previous and later processes is formed, the raw material cost is saved, and the lithium recovery rate is also improved.

Description

technical field [0001] The invention relates to a technology for extracting lithium from salt lake brine, in particular to a technology for extracting lithium carbonate from carbonate-type salt lake brine. Background technique [0002] Lithium is an important strategic resource material and an indispensable raw material for modern high-tech products. With the wide application of lithium and lithium salts and the continuous development of high technology, especially in recent years, the lithium battery industry has developed rapidly, and the market demand for lithium has grown rapidly. At present, most domestic lithium salts are extracted from ores, but with the continuous reduction of high-grade lithium ores and the continuous increase in the cost of extracting lithium from ores, and because salt lakes are rich in lithium elements, lithium extraction from salt lakes has gradually attracted people's attention. [0003] my country has huge reserves of lithium resources, secon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12C01D15/08B01D61/44
CPCC22B7/006C22B26/12B01D61/445C01D15/08Y02P10/20
Inventor 熊福军张许王肖虎程杨顾俊杰项娟彭跃峰陈星宇范克银党建兵
Owner JIANGSU JIUWU HITECH
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