CN112978769A - Method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production - Google Patents
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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. A method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps: and (3) filtering the thermal precipitation mother liquor after lithium precipitation to obtain a filtrate A, neutralizing the filtrate A, filtering to obtain a filtrate B, and 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, thus obtaining a sodium and potassium saturated solution C. The method increases the potassium content in the anhydrous sodium sulphate by adjusting the production method of the byproduct anhydrous sodium sulphate generated in the production process of the lithium hydroxide, thereby reducing the potassium content in a production system.
Description
Technical Field
The invention relates to the technical field of lithium hydroxide production, in particular to a method for removing potassium by using anhydrous sodium sulphate in lithium hydroxide production.
Background
With the increasingly prominent problems of energy crisis, environmental pollution and the like, the sustainable development of new energy is developed, the establishment of a low-carbon society becomes a critical need, the lithium battery is a novel high-energy green battery which is paid much attention to, lithium salts such as lithium carbonate and lithium hydroxide are used for preparing various lithium battery materials and have an indispensable position in the lithium battery, during the production process of the lithium salt, potassium and sodium can enter a solution along with a leaching process, and continuous accumulation and circulation in a production system are caused due to subsequent carbonization or causticization, so that the final influence on the quality of the lithium salt product is extremely large.
At present, most reports of potassium enrichment in lithium hydroxide production are treated by using a membrane separation technology, and Ball and the like use an ion exchange membrane of Selemion company to research magnesium-lithium separation (US4,636295.1987); in the patent of Zhengzhou university, CN105903361A introduces a lithium ion selective permeation membrane and a preparation method thereof, the ionic membrane has good separation selectivity on Li + and Na + and K +, but the ionic membrane has higher cost and is not put into industrial production, so an efficient and economic potassium removal scheme is sought.
Disclosure of Invention
The invention aims to provide a method for removing potassium by using anhydrous sodium sulphate in lithium hydroxide production, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps: filtering the thermal precipitation mother liquor after lithium precipitation to obtain a filtrate A, then filtering the filtrate A after neutralization 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 to obtain a sodium and potassium saturated solution C, heating and evaporating the sodium and potassium saturated solution C, filtering to obtain a filter cake, and drying the filter cake to obtain the finished product anhydrous sodium sulphate.
Further, the lithium precipitation operation is to dissolve industrial sodium carbonate in distilled water to prepare a saturated sodium carbonate solution, slowly add the saturated sodium carbonate solution into the thermal precipitation mother liquor and stir, and stop adding the saturated sodium carbonate solution when no more precipitate is generated by visual observation.
Further, the adding speed of the saturated sodium carbonate solution is controlled to be 10-30ml/min, and the temperature during stirring is controlled to be 60-100 ℃.
Further, the neutralization operation is carried out by adding sulfuric acid to the filtrate A to bring the pH thereof to 6.5 to 7, and further adding a saturated sodium sulfate solution to the solution until sodium sulfate in the solution is no longer dissolved.
Further, the sulfuric acid is industrial sulfuric acid having a concentration of 50%.
Further, the sodium source and the potassium source are added in a ratio of 1: 10.
Further, the sodium source is any one of a saturated sodium sulfate solution and a saturated sodium bisulfate solution, and the potassium source is any one of a saturated potassium sulfate solution and a saturated potassium bisulfate solution.
Further, the heating evaporation operation is to put the sodium and potassium saturated solution C on a heating furnace for continuous heating, stop heating after the sodium and potassium saturated solution C is boiled, keep the existing temperature, and continuously heat until a large amount of solid is generated, and the volume ratio of the solid to the liquid is 1:2-2: 1.
Furthermore, the drying temperature of the filter cake is 80-120 ℃, and the drying time is 5-15 min.
Compared with the prior art, the invention has the beneficial effects that:
the invention increases the potassium content in the anhydrous sodium sulphate by adjusting the production method of the byproduct anhydrous sodium sulphate generated in the production process of the lithium hydroxide, thereby reducing the potassium content in the production system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps:
putting 500ml of thermal precipitation mother liquor into a beaker with the volume of 1L, dissolving industrial sodium carbonate in distilled water to prepare saturated sodium carbonate solution, adding the saturated sodium carbonate solution into the thermal precipitation mother liquor at the speed of 20ml/min, stirring, controlling the stirring temperature to be 80 ℃, stopping adding the saturated sodium carbonate solution when no precipitate is generated by visual observation, filtering the solution to obtain filtrate A, adding 50% industrial sulfuric acid into the filtrate A to ensure that the pH value is 6.7, adding the saturated sodium sulfate solution into the solution until the sodium sulfate in the solution is not dissolved, filtering to obtain filtrate B, sequentially adding the saturated sodium sulfate solution and the saturated potassium sulfate solution in the proportion of 1:10 into the filtrate B until the potassium sulfate in the filtrate B is not dissolved any more to obtain saturated sodium and potassium solution C, putting the saturated sodium and potassium solution C on a heating furnace for continuous heating, stopping heating after boiling, maintaining the existing temperature, continuously heating until a large amount of solid is generated and the volume ratio of solid to liquid is 1:1, filtering to obtain filter cake, drying the filter cake at 100 deg.C for 5min to obtain anhydrous sodium sulfate, and testing to obtain K in anhydrous sodium sulfate2The O content was 1.808%.
Example two:
a method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps:
placing 500ml of thermal precipitation mother liquor into a beaker with the volume of 1L, dissolving industrial sodium carbonate in distilled water to prepare saturated sodium carbonate solution, adding the saturated sodium carbonate solution into the thermal precipitation mother liquor at the speed of 10ml/min and stirring, controlling the stirring temperature to be 80 ℃, stopping adding the saturated sodium carbonate solution when no precipitate is generated by visual inspection, filtering the solution to obtain filtrate A, adding 50% industrial sulfuric acid into the filtrate A to ensure that the pH value is 6.7, and adding the saturated sodium sulfate solution into the solution until the solution is in the state of being dissolvedFiltering to obtain filtrate B, sequentially adding saturated sodium sulfate solution and saturated potassium sulfate solution at a ratio of 1:10 into the filtrate B until potassium sulfate in the filtrate B is not dissolved to obtain saturated sodium and potassium solution C, heating the saturated sodium and potassium solution C in a heating furnace continuously, stopping heating after the saturated sodium and potassium solution C is boiled, keeping the existing temperature and heating continuously until a large amount of solid is generated and the volume ratio of the solid to the liquid is 1:1, filtering to obtain a filter cake, drying the filter cake at 100 ℃ for 5min to obtain a finished product glauber salt, and testing to obtain K in the glauber salt2The O content was 1.807%.
Example three:
a method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps:
putting 500ml of thermal precipitation mother liquor into a beaker with the volume of 1L, dissolving industrial sodium carbonate in distilled water to prepare saturated sodium carbonate solution, adding the saturated sodium carbonate solution into the thermal precipitation mother liquor at the speed of 30ml/min, stirring, controlling the stirring temperature to be 80 ℃, stopping adding the saturated sodium carbonate solution when no precipitate is generated by visual observation, filtering the solution to obtain filtrate A, adding 50% industrial sulfuric acid into the filtrate A to ensure that the pH value is 6.7, adding the saturated sodium sulfate solution into the solution until the sodium sulfate in the solution is not dissolved, filtering to obtain filtrate B, sequentially adding the saturated sodium sulfate solution and the saturated potassium sulfate solution in the proportion of 1:10 into the filtrate B until the potassium sulfate in the filtrate B is not dissolved any more to obtain saturated sodium and potassium solution C, putting the saturated sodium and potassium solution C on a heating furnace for continuous heating, stopping heating after boiling, maintaining the existing temperature, continuously heating until a large amount of solid is generated and the volume ratio of solid to liquid is 1:1, filtering to obtain filter cake, drying the filter cake at 100 deg.C for 5min to obtain anhydrous sodium sulfate, and testing to obtain K in anhydrous sodium sulfate2The O content was 1.705%.
Example four:
a method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps:
placing 500ml of the thermal precipitation mother liquor into a beaker with the volume of 1L, and dissolving the industrial sodium carbonate into the beakerPreparing saturated sodium carbonate solution in distilled water, adding the saturated sodium carbonate solution into a thermal precipitation mother liquor at the speed of 20ml/min, stirring, controlling the stirring temperature to be 60 ℃, stopping adding the saturated sodium carbonate solution when no precipitation is generated by visual observation, filtering the solution to obtain a filtrate A, adding 50% industrial sulfuric acid into the filtrate A to ensure that the pH value is 6.7, adding the saturated sodium sulfate solution into the solution until the sodium sulfate in the solution is not dissolved, filtering to obtain a filtrate B, sequentially adding the saturated sodium sulfate solution and the saturated potassium sulfate solution with the ratio of 1:10 into the filtrate B until the potassium sulfate in the filtrate B is not dissolved, thus obtaining a saturated sodium and potassium solution C, putting the saturated sodium and potassium solution C on a heating furnace for continuously heating, stopping heating after the saturated sodium and potassium solution C is boiled, keeping the existing temperature and continuously heating until a large amount of solid is generated, and the volume ratio of the solid to the liquid is 1:1, filtering to obtain a filter cake, drying the filter cake at 100 ℃ for 5min to obtain a finished product of anhydrous sodium sulphate, and testing to obtain K in the anhydrous sodium sulphate2The O content was 1.605%.
Example five:
a method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps:
putting 500ml of thermal precipitation mother liquor into a beaker with the volume of 1L, dissolving industrial sodium carbonate in distilled water to prepare saturated sodium carbonate solution, adding the saturated sodium carbonate solution into the thermal precipitation mother liquor at the speed of 20ml/min, stirring, controlling the stirring temperature to be 100 ℃, stopping adding the saturated sodium carbonate solution when no precipitate is generated by visual observation, filtering the solution to obtain filtrate A, adding 50% industrial sulfuric acid into the filtrate A to ensure that the pH value is 6.7, adding the saturated sodium sulfate solution into the solution until the sodium sulfate in the solution is not dissolved, filtering to obtain filtrate B, sequentially adding the saturated sodium sulfate solution and the saturated potassium sulfate solution in the proportion of 1:10 into the filtrate B until the potassium sulfate in the filtrate B is not dissolved any more to obtain saturated sodium and potassium solution C, putting the saturated sodium and potassium solution C on a heating furnace for continuous heating, stopping heating after it is boiled, maintaining the existing temperature and continuously heating until a large amount of solid is generated and the volume ratio of the solid to the liquid is 1:1, filtering to obtain a filter cake, and collectingDrying the filter cake at 100 deg.C for 5min to obtain anhydrous sodium sulfate, and testing to obtain K in anhydrous sodium sulfate2The O content was 1.805%.
Example six:
a method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps:
putting 500ml of thermal precipitation mother liquor into a beaker with the volume of 1L, dissolving industrial sodium carbonate in distilled water to prepare saturated sodium carbonate solution, adding the saturated sodium carbonate solution into the thermal precipitation mother liquor at the speed of 20ml/min, stirring, controlling the stirring temperature to be 80 ℃, stopping adding the saturated sodium carbonate solution when no precipitate is generated by visual observation, filtering the solution to obtain filtrate A, adding 50% industrial sulfuric acid into the filtrate A to ensure that the pH value is 6.6, adding the saturated sodium sulfate solution into the solution until the sodium sulfate in the solution is not dissolved, filtering to obtain filtrate B, sequentially adding the saturated sodium sulfate solution and the saturated potassium sulfate solution in the proportion of 1:10 into the filtrate B until the potassium sulfate in the filtrate B is not dissolved any more to obtain saturated sodium and potassium solution C, putting the saturated sodium and potassium solution C on a heating furnace for continuous heating, stopping heating after boiling, maintaining the existing temperature, continuously heating until a large amount of solid is generated and the volume ratio of solid to liquid is 1:1, filtering to obtain filter cake, drying the filter cake at 100 deg.C for 5min to obtain anhydrous sodium sulfate, and testing to obtain K in anhydrous sodium sulfate2The O content was 1.558%.
Example seven:
a method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps:
placing 500ml of thermal precipitation mother liquor into a beaker with the volume of 1L, dissolving industrial sodium carbonate in distilled water to prepare saturated sodium carbonate solution, adding the saturated sodium carbonate solution into the thermal precipitation mother liquor at the speed of 20ml/min, stirring, controlling the stirring temperature to be 80 ℃, stopping adding the saturated sodium carbonate solution when no precipitate is generated by visual observation, filtering the solution to obtain filtrate A, adding 50% industrial sulfuric acid into the filtrate A to ensure that the pH value is 7.0, adding the saturated sodium sulfate solution into the solution until the sodium sulfate in the solution is not dissolved, and filtering to obtain the sodium sulfateAdding saturated sodium sulfate solution and saturated potassium sulfate solution at a ratio of 1:10 into the filtrate B in sequence until potassium sulfate in the filtrate B is not dissolved to obtain saturated sodium and potassium solution C, placing the saturated sodium and potassium solution C on a heating furnace to continuously heat, stopping heating after the saturated sodium and potassium solution C is boiled, keeping the existing temperature and continuously heating until a large amount of solid is generated and the volume ratio of the solid to the liquid is 1:1, filtering to obtain a filter cake, drying the filter cake at 100 ℃ for 5min to obtain a finished product glauber salt, and testing to obtain K in the glauber salt2The O content was 1.964%.
Example eight:
a method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps:
putting 500ml of thermal precipitation mother liquor into a beaker with the volume of 1L, dissolving industrial sodium carbonate in distilled water to prepare saturated sodium carbonate solution, adding the saturated sodium carbonate solution into the thermal precipitation mother liquor at the speed of 20ml/min and stirring, controlling the stirring temperature to be 80 ℃, stopping adding the saturated sodium carbonate solution when no precipitate is generated by visual observation, filtering the solution to obtain filtrate A, adding 50% industrial sulfuric acid into the filtrate A to ensure that the pH value is 6.7, adding the saturated sodium sulfate solution into the solution until the sodium sulfate in the solution is not dissolved, filtering to obtain filtrate B, sequentially adding the saturated sodium bisulfate solution and the saturated potassium bisulfate solution in the proportion of 1:10 into the filtrate B until the potassium sulfate in the filtrate B is not dissolved any more, obtaining saturated sodium and potassium solution C, putting the saturated sodium and potassium solution C on a heating furnace for continuous heating, stopping heating after boiling, maintaining the existing temperature, continuously heating until a large amount of solid is generated and the volume ratio of solid to liquid is 1:1, filtering to obtain filter cake, drying the filter cake at 100 deg.C for 5min to obtain anhydrous sodium sulfate, and testing to obtain K in anhydrous sodium sulfate2The O content was 1.704%.
Example nine:
a method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps:
placing 500ml of the thermal precipitation mother liquor into a beaker with the volume of 1L, and dissolving industrial sodium carbonate into distilled water to prepare saturated sodium carbonateAdding a saturated sodium carbonate solution into a thermal precipitation mother liquor at the speed of 20ml/min, stirring, controlling the stirring temperature to be 80 ℃, stopping adding the saturated sodium carbonate solution when no precipitation is generated by visual observation, filtering the solution to obtain a filtrate A, adding 50% industrial sulfuric acid into the filtrate A to ensure that the pH value is 6.7, adding a saturated sodium sulfate solution into the solution until the sodium sulfate in the solution is not dissolved, filtering to obtain a filtrate B, sequentially adding a saturated sodium sulfate solution and a saturated potassium sulfate solution into the filtrate B in a ratio of 1:10 until the potassium sulfate in the filtrate B is not dissolved, thus obtaining a saturated sodium and potassium solution C, continuously heating the saturated sodium and potassium solution C on a heating furnace, stopping heating after the saturated sodium and potassium solution C is boiled, keeping the existing temperature and continuously heating until a large amount of solid is generated, wherein the volume ratio of the solid to the liquid is 1:2, filtering to obtain filter cake, drying the filter cake at 100 deg.C for 5min to obtain anhydrous sodium sulfate, and testing to obtain K in anhydrous sodium sulfate2The O content was 1.804%.
Example ten:
a method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production comprises the following steps:
putting 500ml of thermal precipitation mother liquor into a beaker with the volume of 1L, dissolving industrial sodium carbonate in distilled water to prepare saturated sodium carbonate solution, adding the saturated sodium carbonate solution into the thermal precipitation mother liquor at the speed of 20ml/min, stirring, controlling the stirring temperature to be 80 ℃, stopping adding the saturated sodium carbonate solution when no precipitate is generated by visual observation, filtering the solution to obtain filtrate A, adding 50% industrial sulfuric acid into the filtrate A to ensure that the pH value is 6.7, adding the saturated sodium sulfate solution into the solution until the sodium sulfate in the solution is not dissolved, filtering to obtain filtrate B, sequentially adding the saturated sodium sulfate solution and the saturated potassium sulfate solution in the proportion of 1:10 into the filtrate B until the potassium sulfate in the filtrate B is not dissolved any more to obtain saturated sodium and potassium solution C, putting the saturated sodium and potassium solution C on a heating furnace for continuous heating, stopping heating after boiling, maintaining the existing temperature and continuously heating until a large amount of solid is generated and the volume ratio of the solid to the liquid is 2:1, filtering to obtain a filter cake, and drying the filter cake at 100 ℃ for 5min to obtain the final productThe anhydrous sodium sulfate is finished, and K in the anhydrous sodium sulfate is obtained by testing2The O content was 1.805%.
Comparative example one:
putting 500ml of thermal precipitation mother liquor into a beaker with the volume of 1L, heating the flask to 80 ℃ on a graphite electric plate, adding sodium sulfate into the flask until the temperature is saturated, filtering to obtain filtrate A, adding potassium sulfate into the filtrate A until the filtrate is saturated, filtering to obtain filtrate B, putting the filtrate B into the beaker, putting an evaporating dish at the opening of the beaker, heating until the boiling, and because a large amount of hydroxide radicals in the solution influence the precipitation of anhydrous sodium sulphate.
Comparative example two:
placing 500ml of thermal precipitation mother liquor into a beaker with the volume of 1L, adding 50% industrial sulfuric acid until the solution is weakly acidic, heating the solution to 80 ℃ on a graphite electrode plate, adding sodium sulfate until the solution is saturated, filtering to obtain filtrate A, adding potassium sulfate into the filtrate A until the solution is saturated, filtering to obtain filtrate B, placing the filtrate B into the beaker, placing an evaporating dish at the opening of the beaker, heating until the solution is boiling, continuously evaporating until a large amount of solid is generated in the solution, stopping heating, filtering and drying to obtain anhydrous sodium sulphate, and testing to obtain K in the anhydrous sodium sulphate2The O content was 8.330%.
K in anhydrous sodium sulfate produced in examples one to ten and comparative examples one and two2The O content and its quality are tabulated and the results are shown in table 1:
as can be seen from Table 1, K is the anhydrous sodium sulfate produced by the process of the present invention2The content of O is 1.5-2.0%, and K is contained in anhydrous sodium sulfate2When the content of O exceeds 2.0 percent, the subsequent use quality of the anhydrous sodium sulphate can be influenced, and the method can lead the anhydrous sodium sulphate to have K2The content range of O is controlled to be 1.5-2.0%, the potassium content in the system is reduced on the premise of not influencing the quality of anhydrous sodium sulphate, and the potassium removal method is more economical and efficient compared with other methods.
TABLE 1
| Item | K2O content (%) | Quality of anhydrous sodium sulphate |
| Example one | 1.808 | Qualified |
| Example two | 1.807 | Qualified |
| EXAMPLE III | 1.705 | Qualified |
| Example four | 1.605 | Qualified |
| EXAMPLE five | 1.805 | Qualified |
| EXAMPLE six | 1.558 | Qualified |
| EXAMPLE seven | 1.964 | Qualified |
| Example eight | 1.704 | Qualified |
| Example nine | 1.804 | Qualified |
| Example ten | 1.805 | Qualified |
| Comparative example 1 | / | / |
| Comparative example No. two | 8.330 | Fail to be qualified |
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method for removing potassium from anhydrous sodium sulfate in lithium hydroxide production is characterized by comprising the following steps: the method comprises the following steps: filtering the thermal precipitation mother liquor after lithium precipitation to obtain a filtrate A, then filtering the filtrate A after neutralization 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 to obtain a sodium and potassium saturated solution C, heating and evaporating the sodium and potassium saturated solution C, filtering to obtain a filter cake, and drying the filter cake to obtain the finished product anhydrous sodium sulphate.
2. The method for removing potassium sulfate from anhydrous sodium sulfate for lithium hydroxide production according to claim 1, wherein the method comprises the following steps: the lithium precipitation operation is to dissolve industrial sodium carbonate into distilled water to prepare saturated sodium carbonate solution, slowly add the saturated sodium carbonate solution into the thermal precipitation mother liquor and stir, and stop adding the saturated sodium carbonate solution when no precipitation is generated by visual observation.
3. The method for removing potassium sulfate from anhydrous sodium sulfate for lithium hydroxide production according to claim 2, wherein the method comprises the following steps: the adding speed of the saturated sodium carbonate solution is controlled to be 10-30ml/min, and the temperature during stirring is controlled to be 60-100 ℃.
4. The method for removing potassium sulfate from anhydrous sodium sulfate for lithium hydroxide production according to claim 1, wherein the method comprises the following steps: the neutralization operation is to add sulfuric acid into the filtrate A to make the pH value of the filtrate A be 6.5-7, and then add saturated sodium sulfate solution into the solution until the sodium sulfate in the solution is not dissolved any more.
5. The method for removing potassium sulfate from anhydrous sodium sulfate for lithium hydroxide production according to claim 4, wherein the method comprises the following steps: the sulfuric acid is industrial sulfuric acid with the concentration of 50%.
6. The method for removing potassium sulfate from anhydrous sodium sulfate for lithium hydroxide production according to claim 1, wherein the method comprises the following steps: the adding ratio of the sodium source to the potassium source is 1: 10.
7. The method for removing potassium sulfate from anhydrous sodium sulfate for lithium hydroxide production according to claim 6, wherein the method comprises the following steps: the sodium source is any one of a saturated sodium sulfate solution and a saturated sodium bisulfate solution, and the potassium source is any one of a saturated potassium sulfate solution and a saturated potassium bisulfate solution.
8. The method for removing potassium sulfate from anhydrous sodium sulfate for lithium hydroxide production according to claim 1, wherein the method comprises the following steps: and the heating evaporation operation comprises the steps of putting the sodium and potassium saturated solution C on a heating furnace for continuous heating, stopping heating after the sodium and potassium saturated solution C is boiled, keeping the existing temperature and continuously heating until a large amount of solid is generated, wherein the volume ratio of the solid to the liquid is 1:2-2: 1.
9. The method for removing potassium sulfate from anhydrous sodium sulfate for lithium hydroxide production according to claim 1, wherein the method comprises the following steps: the drying temperature of the filter cake is 80-120 ℃, and the drying time is 5-15 min.
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| CN115744939A (en) * | 2022-11-14 | 2023-03-07 | 江西赣锋锂业集团股份有限公司 | Method for removing potassium from lithium hydroxide production mother liquor |
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