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Supported liquid membrane lithium extraction device and membrane process brine lithium extraction process

A technology for supporting liquid membranes and supporting membranes, applied in the direction of improving process efficiency, etc., can solve problems such as large amount of evaporated water, easily corroded equipment, and damage to the adsorption capacity of adsorbents, and achieve high separation efficiency, low consumption, and simple devices Effect

Active Publication Date: 2019-04-26
NANJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

The precipitation method is difficult to apply to lithium extraction in salt lake brine with high magnesium-lithium ratio in China; the adsorption method uses a large amount of adsorbent in the lithium extraction process, and the regeneration of the adsorbent is difficult and the adsorption capacity of the adsorbent after regeneration will be damaged to a certain extent. Environmental factors have a great influence on the adsorption effect of the adsorbent, and the process conditions are relatively high
The calcination method will produce a large amount of hydrogen chloride gas in the production process of lithium extraction, which is easy to corrode the equipment, the amount of evaporated water is large, and the energy consumption is high. It is also necessary to consider the energy saving and environmental protection issues of subsequent production
Solvent extraction is suitable for aqueous solutions with high lithium concentration, and the amount of extraction agent is large and the cost is high, which limits its large-scale industrial development

Method used

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  • Supported liquid membrane lithium extraction device and membrane process brine lithium extraction process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 As shown: the supported liquid film lithium extraction device consists of lithium extraction liquid tank A1, organic solvent liquid tank A2, stripping agent liquid tank A3, "sandwich" membrane module B, first metering pump C1, second metering pump C2, third The metering pump C3 and related pipelines are connected in a specific order; among them, the "sandwich" membrane module B is divided into three chambers by two support membranes, the hydrophilic support membrane M1 and the hydrophobic support membrane M2, respectively, and the hydrophilic support membrane The front of the support membrane M1 is opposite to the lithium liquid chamber B1, the reverse side of the two support membranes is the extractant chamber B2, and the front of the hydrophobic support membrane M2 is opposite to the stripping agent extraction chamber B3. The bottom of the lithium extraction tank A1 flows through the pipeline through the first metering pump C1 and is connected to the ...

Embodiment 2

[0028]A raw material liquid brine containing 100mg / L of lithium is subjected to lithium extraction treatment using the device and process of the present invention. The brine enters the pretreatment chamber F1, and first settles for 12 hours to remove solid impurities; after settling, the brine supernatant enters the ceramic ultrafiltration section, using alumina ceramic membranes, the membrane pore size is 5nm, and the operating pressure is 0.1MPa; the ultrafiltration permeate enters the vacuum membrane The distillation section uses a hydrophobic alumina ceramic membrane with a pore size of 0.1 μm, a membrane surface flow rate of 1m / s, a vacuum degree of 5KPa on the permeation side, and an operating temperature of 50°C. The concentrated liquid obtained through vacuum membrane distillation is concentrated lithium liquid 1 , the concentration of lithium ions is concentrated to 0.5g / L; 5L concentrated lithium solution 1 enters the lithium extraction solution tank A1, and the brine...

Embodiment 3

[0030] A raw material liquid brine containing 200mg / L of lithium is subjected to lithium extraction treatment using the device and process of the present invention. The brine enters the pretreatment chamber F1, and first settles for 12 hours to remove solid impurities; after settling, the brine supernatant enters the ceramic ultrafiltration section, using a zirconia ceramic membrane with a pore size of 50nm and an operating pressure of 0.3MPa; the ultrafiltration permeate enters the vacuum membrane The distillation section adopts a hydrophobic zirconia ceramic membrane with a membrane pore size of 0.2 μm, a membrane surface flow rate of 2 m / s, a vacuum degree of 10 KPa on the permeation side, and an operating temperature of 60 ° C. The concentrated liquid obtained through vacuum membrane distillation is concentrated lithium liquid 1 , the lithium ion concentration is concentrated to 5g / L; 4L concentrated lithium solution 1 enters the lithium extraction solution tank A1, and the...

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Abstract

The invention relates to a supported liquid membrane lithium extraction device and a membrane process brine lithium extraction process. The supported liquid membrane lithium extraction device is composed of a lithium extraction liquid tank (A1), an extractant liquid tank (A2), a counter-extractant liquid tank (A3), a sandwich membrane assembly (B), a first metering pump (C1), a second metering pump (C2) and a third metering pump (C3). The membrane process brine lithium extraction process is composed of three units: pre-treatment of brine, supported liquid membrane lithium extraction and lithium salt refining. The membrane process brine lithium extraction process specifically comprises the following steps: brine enters a pre-treatment room to be settled, ultra-filtrated and distilled by a vacuum membrane; then the brine enters the supported liquid membrane lithium extraction device to extract lithium to obtain a counter-extractant lithium liquid; then the counter-extractant lithium liquid enters a lithium refining room to be concentrated, settled and dried to obtain the lithium salt. By extracting lithium from high magnesium-lithium ratio brine by adopting a supported liquid membrane lithium extraction technology, the method breaks through the chemical equilibrium of conventional solvent extraction and strengthens mass transfer and achieves coupling of extraction and counter-extraction in the lithium extraction process, so that the lithium extraction process can be carried out continuously and the dosage of the extractant is reduced. The process is an environment-friendly and efficient separating method.

Description

technical field [0001] The invention relates to a supported lithium extraction device and a membrane-based brine lithium extraction process, in particular to a new method for supporting liquid membrane lithium extraction that can realize simultaneous extraction and back-extraction processes. Background technique [0002] Lithium is an important metal element. In recent years, metal lithium has been used more and more in the fields of aerospace, nuclear power generation, battery energy and ultra-light and high-strength lithium-aluminum alloys. It has become an important metal material for industrial production and is called "the energy metal of the 21st century." ". At present, the more mature methods for extracting lithium from salt lake brine mainly include precipitation, adsorption, calcination and solvent extraction, which have been applied to the industrial production of lithium salts. For salt lake brine with low magnesium-lithium ratio, the classic precipitation meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/02C22B3/22C22B3/44C22B3/38C22B3/40C22B26/12
CPCC22B3/02C22B3/22C22B3/44C22B26/12C22B3/3846C22B3/409Y02P10/20
Inventor 李卫星时漫利邢卫红
Owner NANJING UNIV OF TECH
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