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Concentration technology for producing lithium salt by sulfuric acid method

A technology of lithium sulfate and sulfuric acid method, which is applied in the direction of lithium sulfate/sulfite, lithium carbonate; Problems such as high cost and difficulty, to achieve the effect of small processing difficulty, low production cost, and low energy consumption

Inactive Publication Date: 2016-10-12
SICHUAN SIDANENG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process determines a large amount of energy consumption, and the processing cost and difficulty are relatively large
[0007] (2) The evaporation and concentration process requires more equipment, and the maintenance cost and difficulty are higher;
[0008] (3) While evaporating and concentrating wastes water resources, it also pollutes the environment, which is not conducive to the sustainable and healthy development of enterprises

Method used

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  • Concentration technology for producing lithium salt by sulfuric acid method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of enrichment process for the production of sulfuric acid lithium salt, comprises the following steps:

[0038] 1) Softening pretreatment: use resin to alternately adsorb calcium and magnesium ions in the raw solution to obtain a lithium sulfate leaching solution with a total content of calcium and magnesium ions of 0.6 mg / L.

[0039] 2) Membrane filtration: the lithium sulfate leaching solution obtained in step 1) is utilized to carry out membrane filtration by a microfiltration membrane made of polysulfone, the microfiltration membrane aperture is 5 μm, and the pressure of the lithium sulfate leaching solution through the microfiltration membrane is 0.02MPa to obtain Solid impurity and solid content are 4.8ppm, lithium ion content is the lithium sulfate solution of 20g / L;

[0040] 3) Membrane concentration: the lithium sulfate solution obtained in step 1) is utilized to carry out membrane concentration by a nanofiltration membrane made of polyamide, the nanofil...

Embodiment 2

[0045] A kind of enrichment process for the production of sulfuric acid lithium salt, comprises the following steps:

[0046] 1) Softening pretreatment: use resin to alternately adsorb calcium and magnesium ions in the raw solution to obtain a lithium sulfate leaching solution with a total content of calcium and magnesium ions of 0.52 mg / L.

[0047] 2) Membrane filtration: the lithium sulfate leaching solution obtained in step 1) is utilized for membrane filtration by a microfiltration membrane made of polyvinylidene fluoride, the microfiltration membrane pore size is 2 μm, and the pressure of the lithium sulfate leaching solution passing through the microfiltration membrane is 0.1MPa , obtaining solid impurity and solid content is 4ppm, lithium ion content is the lithium sulfate solution of 22g / L;

[0048] 3) Membrane concentration: the lithium sulfate solution obtained in step 1) is utilized to carry out membrane concentration by a nanofiltration membrane made of polyamide, ...

Embodiment 3

[0053] A kind of enrichment process for the production of sulfuric acid lithium salt, comprises the following steps:

[0054] 1) Softening pretreatment: use resin to alternately adsorb calcium and magnesium ions in the leaching stock solution to obtain a lithium sulfate leaching solution with a total content of calcium and magnesium ions of 0.43 mg / L.

[0055] 2) Membrane filtration: the lithium sulfate leaching solution obtained in step 1) is utilized to carry out membrane filtration by a microfiltration membrane made of polyacrylonitrile, the microfiltration membrane aperture is 1 μm, and the pressure of the lithium sulfate leaching solution through the microfiltration membrane is 0.1MPa, Obtaining solid impurity and solid content is 3.5ppm, lithium ion content is the lithium sulfate solution of 25g / L;

[0056] 3) membrane concentration: the lithium sulfate solution obtained in step 1) is utilized to carry out membrane concentration by a nanofiltration membrane made of cellu...

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Abstract

The invention relates to a concentration process for the production of lithium salt by sulfuric acid method, which is used for concentration of lithium sulfate solution before the lithium sinking step, comprising the following steps: membrane concentration: using a concentration membrane with a pore size of 0.1-1nm to concentrate the lithium sulfate solution Membrane concentration is carried out to obtain lithium sulfate concentrate and permeate. The invention intercepts the lithium ions in the lithium sulfate solution through the concentration membrane, separates excess water, increases the total lithium ion content of the lithium sulfate solution, and achieves the purpose of concentration, and the separated permeate has a higher purity, It can continue to be recycled and applied to the leaching and extraction process of lithium sulfate solution; compared with the evaporation concentration in the prior art, the membrane concentration process adopted in the present invention has the advantages of low energy consumption, low production cost, high concentration efficiency, small processing difficulty, and environmental protection. The advantage of less pollution.

Description

technical field [0001] The invention relates to a concentration process for the production of lithium salt by sulfuric acid method, which is suitable for the concentration of lithium ions before the lithium sinking process in the production of lithium salt by sulfuric acid method. Background technique [0002] Lithium is an important strategic resource material and an indispensable raw material for modern high-tech products. my country's proven total reserves of lithium resources rank second in the world, but lithium production only accounts for about 5% of the global total, and it is a net importer of lithium products. [0003] Lithium carbonate is the basic material for the production of secondary lithium salts and lithium metal products, so it has become the most used lithium product in the lithium industry, and other lithium products are basically downstream products of lithium carbonate. The production process of lithium carbonate can be divided into salt lake brine ex...

Claims

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Application Information

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IPC IPC(8): C01D15/06C01D15/08
CPCC01D15/06C01D15/08
Inventor 郭定江何志刘超何珂桥郭乾勇
Owner SICHUAN SIDANENG ENVIRONMENTAL PROTECTION TECH CO LTD
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