Method for purification and impurity removal of high-salt chlorinated system

A purification and removal of impurities, high salt technology, applied in the direction of chemical instruments and methods, lithium halide, process efficiency improvement, etc., can solve the problems of low cost, high yield, not reaching the lithium carbonate brine index, etc., to achieve a wide selection Effect

Inactive Publication Date: 2016-11-09
SICHUAN SIDANENG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xu's method is low in cost, high in effectiveness and high in yield, but actual field tests show that although the concentration of lithium ions in brine can be increased, there is still a large amount of magnesium in brine, and the ratio of magnesium to lithium is still very high, far from The brine index for producing lithium carbonate has not been reached

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Primary Impurity Removal of Chlorinated Water with High Lithium and Low Calcium and Magnesium

[0048] The influent water is low-hardness, high-salt and chlorinated water obtained during the lithium production process. The nanofilter is set to superNF-300, the pressure difference on both sides of the membrane is set to 12Mpa, and the flow rate is set to 15L / h m 2 , the data is shown in the table below:

[0049] Table 1

[0050] project

Embodiment 2

[0052] Primary impurity removal for low-lithium, low-calcium and magnesium-chlorinated water.

[0053] Choose low hardness chloride-type lithium-containing salt lake brine as the inlet water, set the nanofilter to super NF-100, set the pressure difference on both sides of the membrane to 18Mpa, and set the flow rate to 16L / h m 2 , the data is shown in the table below:

[0054] Table 2

[0055] project

Embodiment 3

[0057] Secondary Impurity Removal of Chlorinated Water with High Lithium, High Calcium and Magnesium

[0058] The influent water is high-hardness, high-salt and chlorine-containing water obtained in the lithium production process. The nanofilter is equipped with a PALLDTNF membrane. The pressure difference on both sides of the membrane is set to 16Mpa, and the flow rate is set to 15L / h m 2 , the data is shown in the table below:

[0059] table 3

[0060] project

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PUM

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Abstract

The invention belongs to the technical field of lithium production, and specifically relates to a method for purification and impurity removal of a high-salt chlorinated system. The method comprises the step of: purifying high-salt chlorinated water through a nano-filter to obtain low-salt chlorinated water, wherein, in the high-salt chlorinated water, the content of lithium is 0-52.0 g/L and the content of calcium and magnesium is 0-30 g/L; in the low-salt chlorinated water, the content of lithium is 0-52.0 g/L and the content of calcium and magnesium is less than and equal to 5 mg/L; and a nanofiltration membrane in the nanofilter is a monovalent ion selective nanofiltration membrane. Through the method for purification and impurity removal of the high-salt chlorinated system provided by the invention, the content of calcium and magnesium in impurity-removed drainage water is very low, the content of lithium is very high to reach to a saturation state, the lithium can be directly applied to a refining process of lithium as intermediate goods of lithium production.

Description

technical field [0001] The invention belongs to the technical field of lithium production, and in particular relates to a method for purifying and removing impurities of a high-salt chlorine-containing system. Background technique [0002] Lithium is the lightest metal in the world. Due to some special properties, lithium and its compounds have extensive and special uses, and are known as "energy metals" and "metals that push the world forward". It plays an extremely important role in the energy industry, aerospace industry, metal smelting and manufacturing industry, refrigeration, ceramics, glass and other industries. At present, the global demand for lithium products is very urgent, and the demand for lithium is increasing rapidly year by year. [0003] The largest resource of lithium in the world is lithium ore, mainly including spodumene, lepidolite, lithium petalite, spodumene and eucryptite. The second major resource of lithium is salt lake brine with high lithium co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/22C01D15/04C22B26/12B01D61/00
CPCB01D61/027C01D15/04C22B3/22C22B26/12Y02P10/20
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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