Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for removing potassium by using anhydrous sodium sulphate in lithium hydroxide production

A technology of lithium hydroxide and sodium sulfate, applied in the purification of alkali metal sulfite/sulfate, etc., can solve the problems of high cost, achieve the effect of reducing potassium content and simple process

Active Publication Date: 2021-06-18
YAHUA LITHIUM IND (YAAN) CO LTD
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, for the enrichment of potassium in the production of lithium hydroxide, most reports use membrane separation technology to deal with it. Ball et al. used the ion exchange membrane of Selemion Company Research on the separation of magnesium and lithium (US4,636295.1987); CN105903361A of Zhengzhou University has introduced a kind of lithium ion selective permeation membrane and preparation method thereof in the patent, and this ion membrane is good to Li+ and Na+, K+ separation selectivity, but its The high cost has not been put into industrial production, so it is necessary to find an efficient and economical potassium removal solution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of Lithium Hydroxide production utilizes the method for removing potassium from sodium sulfate, and its method is as follows:

[0019] Take 500ml of thermal analysis mother liquor and put it into a beaker with a volume of 1L, dissolve industrial sodium carbonate in distilled water to make saturated sodium carbonate solution, then add saturated sodium carbonate solution to the thermal analysis mother liquor at a rate of 20ml / min and stir , the stirring temperature is controlled at 80°C, and when no precipitation is observed by the naked eye, stop adding saturated sodium carbonate solution, filter the above solution to obtain filtrate A, add industrial sulfuric acid with a concentration of 50% to filtrate A to make its pH value 6.7, then add saturated sodium sulfate solution to the solution until the sodium sulfate in the solution is no longer dissolved, filter to obtain filtrate B, add saturated sodium sulfate solution and saturated potassium sulfate solution in th...

Embodiment 2

[0021] A kind of Lithium Hydroxide production utilizes the method for removing potassium from sodium sulfate, and its method is as follows:

[0022] Take 500ml of thermal analysis mother liquor and put it into a beaker with a volume of 1L, dissolve industrial sodium carbonate in distilled water to make saturated sodium carbonate solution, then add saturated sodium carbonate solution to the thermal analysis mother liquor at a rate of 10ml / min and stir , the stirring temperature is controlled at 80°C, and when no precipitation is observed by the naked eye, stop adding saturated sodium carbonate solution, filter the above solution to obtain filtrate A, add industrial sulfuric acid with a concentration of 50% to filtrate A to make its pH value 6.7, then add saturated sodium sulfate solution to the solution until the sodium sulfate in the solution is no longer dissolved, filter to obtain filtrate B, add saturated sodium sulfate solution and saturated potassium sulfate solution in th...

Embodiment 3

[0024] A kind of Lithium Hydroxide production utilizes the method for removing potassium from sodium sulfate, and its method is as follows:

[0025] Take 500ml of thermal analysis mother liquor and put it into a beaker with a volume of 1L, dissolve industrial sodium carbonate in distilled water to make saturated sodium carbonate solution, then add saturated sodium carbonate solution to the thermal analysis mother liquor at a rate of 30ml / min and stir , the stirring temperature is controlled at 80°C, and when no precipitation is observed by the naked eye, stop adding saturated sodium carbonate solution, filter the above solution to obtain filtrate A, add industrial sulfuric acid with a concentration of 50% to filtrate A to make its pH value 6.7, then add saturated sodium sulfate solution to the solution until the sodium sulfate in the solution is no longer dissolved, filter to obtain filtrate B, add saturated sodium sulfate solution and saturated potassium sulfate solution in th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for removing potassium by using anhydrous sodium sulphate in lithium hydroxide production, and relates to the technical field of lithium hydroxide production. The invention relates to a method for removing potassium by using anhydrous sodium sulphate in lithium hydroxide production, and the method comprises the following steps: carrying out lithium precipitation operation on a thermal precipitation mother solution, filtering to obtain a filtrate A, neutralizing the filtrate A, filtering to obtain a filtrate B, sequentially adding a sodium source and a potassium source into the filtrate B until potassium sulfate in the filtrate B is not dissolved any more, and thus obtaining a sodium and potassium saturated solution C. the potassium content in the anhydrous sodium sulphate is increased by adjusting the production method of the by-product anhydrous sodium sulphate generated in the lithium hydroxide production process, so the potassium content in the production system is reduced; compared with a traditional anhydrous sodium sulphate production method, the method is simpler and more convenient in process, and the potassium content in the system is reduced to a certain extent; meanwhile, the quality of the anhydrous sodium sulphate is not affected, and compared with other potassium removal methods, the method is economical and efficient.

Description

technical field [0001] The invention relates to the technical field of lithium hydroxide production, in particular to a method for removing potassium from sodium sulfate in the production of lithium hydroxide. Background technique [0002] With the increasingly prominent problems of energy crisis and environmental pollution, it is imperative to develop new energy sources for sustainable development and build a low-carbon society. As a new type of high-energy green battery, lithium batteries have attracted much attention. Lithium salts such as lithium carbonate and lithium hydroxide are used in The preparation of various lithium battery materials plays an indispensable role in lithium batteries. During the production of lithium salts, potassium and sodium will enter the solution with the leaching process, and due to subsequent carbonization or causticization, it will continue to be in the production system. The cumulative cycle will eventually have a great impact on the quali...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/16
CPCC01D5/16C01P2006/80
Inventor 赵江董兴旺高玉煙孟岩唐佳华杨振国
Owner YAHUA LITHIUM IND (YAAN) CO LTD