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A purification process suitable for treating lithium-containing minerals by sodium salt method

A purification process, sodium salt technology, which is applied in photography technology, photography auxiliary technology, instruments, etc., can solve the problems of low utilization value of waste residue, complicated process flow, high cost of impurity removal, etc., achieve low cell voltage, shorten process flow, reduce The effect of production costs

Active Publication Date: 2021-08-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires a large amount of alkaline substances and is difficult to recycle, resulting in low utilization value of waste residue and high cost of impurity removal
Chinese patent CN101974684A discloses a process for removing impurities from lepidolite leaching solution. After repeated evaporation and crystallization or precipitation into alum twice, the pH is adjusted twice to further remove impurity ions in the leaching solution, so that the purified solution can be purified. It is used in the lithium precipitation process to produce lithium carbonate products. A total of four precipitation and solid-liquid separations are required before and after, and the process flow is relatively complicated.

Method used

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  • A purification process suitable for treating lithium-containing minerals by sodium salt method
  • A purification process suitable for treating lithium-containing minerals by sodium salt method
  • A purification process suitable for treating lithium-containing minerals by sodium salt method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) The sodium superionic conductor type NaV in the sodium-deficient state 2 (PO 4 ) 3 , with acetylene black and polyvinylidene fluoride (PVDF) at a mass ratio of 90:5:5, uniformly dispersed in N-methylpyrrolidone (NMP) solvent, then evenly coated on both sides of the aluminum plate, and dried at 120 ° C 12h, as the cathode plate; nickel foam was used as the anode, and the leaching solution of lepidolite sodium sulfate sintering method was used as the electrolyte solution. Under the current density of electrolysis for 15h, the adsorption of Li + 、Na + .

[0039] Table 1

[0040]

[0041] 2) (Li, Na) loaded with Li and Na obtained in step 1) 3 V 2 (PO 4 ) 3 The cathode plate is used as the anode, the nickel foam is used as the cathode, and the 1mol / L sodium sulfate solution is used as the electrolyte. The electrolytic cell is divided into an anode chamber and a cathode chamber by an anion semipermeable membrane. Analyze at a current density of 0.1A / g for 15 ...

Embodiment 2

[0044] 1) The sodium-deficient Prussian blue analog FeFe(CN) 6 , and high-purity graphite, polyvinylidene fluoride (PVDF) in a mass ratio of 90:5:5, uniformly dispersed in N-methylpyrrolidone (NMP) solvent, and then evenly coated on both sides of the stainless steel plate, at 120 ° C Dry for 12 hours, and use it as the cathode plate; use graphite as the anode, and the leaching solution obtained by the lepidolite sodium chloride roasting method is used as the electrolyte. Electrolysis at a current density of g for 8h, adsorption of Li + 、Na + .

[0045] Table 2

[0046]

[0047] 2) (Li, Na) loaded with Li and Na obtained in step 1) 2 FeFe(CN) 6 The cathode plate is used as the anode, the graphite is used as the cathode, and 0.3mol / L sodium hydroxide solution is used as the electrolyte. The electrolytic cell is divided into an anode chamber and a cathode chamber by an anion semipermeable membrane. At 20°C, a cell voltage of 1.0V is applied. Analyze at a current density ...

Embodiment 3

[0050] 1) The tunnel-type Na in the sodium-deficient state 0.22 MnO 2 , with high-purity graphite and polyvinylidene fluoride (PVDF) at a mass ratio of 8:1:1, uniformly dispersed in N-methylpyrrolidone (NMP) solvent, and then evenly coated on both sides of the aluminum plate, baked at 80 ° C Dry for 12 hours, as the cathode plate; use nickel foam as the anode, and the leaching solution of spodumene sodium sulfate pressure cooking method as the electrolyte. Electrolyzed for 12h at a current density of / g, the adsorption of Li + , Na + .

[0051] table 3

[0052]

[0053] 2) (Li, Na) loaded with Li and Na obtained in step 1) 0.66 MnO 2 Cathode plate as anode, nickel foam as cathode, 2mol / L Na 2 SO 4 +1mol / L NaOH solution is used as the electrolyte, and the electrolytic cell is divided into an anode chamber and a cathode chamber by an anion semipermeable membrane. Desorption releases Li and Na ions from the plate loaded with Li and Na into the anolyte, and the desorbe...

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Abstract

The invention discloses a purification process suitable for treating lithium-containing minerals by a sodium salt method. The process includes the following steps: 1) coating an active material or a composite material of an active material and carbon on a bottom plate as a cathode, and a conductive material as an anode , the lithium-containing leaching solution obtained by sodium salt leaching is used as the electrolyte, and the cathode plate loaded with Li and Na is obtained by electrolysis; 2) The cathode plate loaded with Li and Na is used as the anode, the conductive material is used as the cathode, and the sodium salt solution is used as the electrolyte. Dialysis releases Li and Na ions into the anolyte. 3) The Li-rich anolyte is evaporated and concentrated, cooled and crystallized to recover sodium sulfate, and the crystallized mother liquor can be directly used as the lithium precipitation mother liquor for the precipitation of lithium carbonate. The invention can selectively separate Li and Na in the leaching solution, and then through simple evaporation and crystallization, the purified solution that can be directly used to precipitate lithium carbonate can be obtained, effectively reducing the amount of acid-base reagents, recovering sodium salt at the same time, and reducing production costs , easy for industrial application.

Description

technical field [0001] The invention belongs to the field of purification of lithium-containing minerals, and in particular relates to a purification process suitable for treating lithium-containing minerals by a sodium salt method. Background technique [0002] Lithium is the lightest metal in nature and has unique physical and chemical properties. It has been widely used in chemical industry, aerospace and other fields, and is known as "industrial monosodium glutamate". With the commercialization of lithium-ion batteries more and more widely used in electronic equipment and electric vehicles and other fields, the market demand for lithium resources is further expanding. [0003] At present, the main sources of raw materials for lithium extraction are brine and lithium-containing minerals. In my country, spodumene and lepidolite are abundant in reserves, and the brine in my country has the characteristics of high magnesium-lithium ratio, which makes separation difficult and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/02C25C7/02C22B26/12C22B3/20
CPCC22B3/20C22B26/12C25C1/02C25C7/02
Inventor 杨成浩熊训辉钟文涛
Owner SOUTH CHINA UNIV OF TECH
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