CN112575339B - Method for preparing lithium hydroxide from spodumene and method for removing sodium and potassium - Google Patents
Method for preparing lithium hydroxide from spodumene and method for removing sodium and potassium Download PDFInfo
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Abstract
The invention relates to a method for preparing lithium hydroxide from spodumene and a method for removing sodium and potassium, belonging to the technical field of ore lithium extraction. The technical problem solved by the invention is to provide a method for preparing lithium hydroxide from spodumene. The method comprises the following steps: 1) roasting; 2) acidifying, leaching and filtering to obtain lithium sulfate mother liquor; 3) removing high-valence metal ions in the lithium sulfate mother liquor; 4) removing sodium and potassium by electrodialysis; 5) electrolyzing by using a bipolar membrane to obtain a lithium hydroxide solution and dilute sulfuric acid; 6) and concentrating and crystallizing the lithium hydroxide solution to obtain a lithium hydroxide product. The method can prepare battery-grade lithium hydroxide from spodumene, and is simple, environment-friendly and low in cost; and sodium and potassium are removed by common electrodialysis before bipolar membrane electrolysis, so that the purity of the obtained product is greatly improved compared with that of the product obtained by the traditional method, the product can reach the battery level by direct crystallization, and the trend and the requirement of green sustainable development are met.
Description
Technical Field
The invention relates to a method for preparing lithium hydroxide from spodumene and a method for removing sodium and potassium, belonging to the technical field of ore lithium extraction.
Background
With the vigorous development of new energy automobiles, the market demand of lithium resources is continuously increasing. At present, lithium resources are derived from spodumene, lepidolite and other ore resources and salt lake brine resources, and different extraction methods are provided according to different characteristics of the lithium resources. However, from the lithium extraction technology, the main technology at present is a wet process technology, namely, lithium and other elements enter a solution together, and then lithium is extracted from the solution. The solution system may be chloride system, sulfate system, etc. and the impurity ions mainly include calcium, magnesium, iron, aluminum and other high valence metal ions and potassium, sodium and other monovalent metal ions. Since potassium and sodium ions and lithium ions are monovalent and are elements of the same group, and the performance is similar, the removal is difficult.
At present, sodium and potassium removal methods are all that sodium removal refining agents and the like are added into lithium products, for example, the inventor of the present invention has studied CN101214978A in early days, and in solution of lithium hydroxide crude product, according to Na+The method relies on the refining agent, thereby increasing the cost of the refining agent and the complexity of the refining process. Therefore, there is a need for a new simple method for removing sodium potassium ions from a solution containing lithium ions, sodium ions and potassium ions (the present invention will be abbreviated as lithium sodium potassium solution).
In the downstream application field of lithium, along with the improvement of the endurance requirement of new energy automobiles and the reduction of the weight of the whole automobile, the market of the lithium battery anode material gradually inclines from lithium iron phosphate to a ternary composite material, particularly the development of a high-nickel ternary material promotes the market demand of lithium salt to be gradually transferred from lithium carbonate to lithium hydroxide, and therefore, the research and preparation of high-quality lithium hydroxide products have important significance.
The traditional process for preparing lithium hydroxide has several methods: a limestone roasting method: the production method takes lepidolite as raw material, the lepidolite is mixed with limestone according to a certain mass ratio, and the mixture is sent into a rotary kiln to be roasted at 850 ℃, and calcium oxide generated by decomposing calcium carbonate reacts with the lepidolite to generate LiOH; ② a sodium carbonate pressure leaching method: roasting the spodumene concentrate in a rotary furnace to convert the spodumene concentrate into beta-spodumene, cooling, ball-milling, uniformly mixing with a certain amount of sodium carbonate, and heating and pressurizing for leaching; ③ lithium sulfate freezing method: roasting, acidifying, pulping and leaching the lithium concentrate to obtain a primarily concentrated lithium sulfate solution, adding sodium hydroxide, cooling and freezing to 5-10 ℃, and precipitating sodium sulfate to obtain lithium hydroxide monohydrate; lithium carbonate causticizing method: prepared by a water causticization reaction between calcium hydroxide and lithium carbonate; electrolytic method: the electrolytic method uses brine or lithium sulfate and lithium carbonate as raw materials, and lithium hydroxide is obtained through ion migration under the action of an electric field.
The bipolar membrane electrodialysis is one of electrolysis methods, and is an electrodialysis method for introducing a bipolar membrane into an electrolytic cell, wherein the bipolar membrane is a novel ion exchange composite membrane, is usually formed by compounding a cation exchange layer, an interface hydrophilic layer and an anion exchange layer, and is a real reaction membrane. Under the action of a direct current electric field, the bipolar membrane can dissociate water to obtain hydrogen ions and hydroxyl ions on two sides of the membrane respectively. By utilizing the characteristic, the bipolar membrane electrodialysis system combining the bipolar membrane and other anion-cation exchange membranes can convert the salt in the aqueous solution into corresponding acid and alkali without introducing new components, thereby improving the capacity of lithium hydroxide. At present, there are a number of reports of bipolar membrane electrodialysis for preparing lithium hydroxide, such as patents CN109772169A, CN105849317B, CN105154908A, etc. However, there is no study in these documents on the removal of sodium ions from the pre-electrolyte entering the bipolar membrane system.
Chinese patent CN109680295A discloses a method for preparing lithium hydroxide from industrial-grade lithium carbonate solid, which comprises the steps of mixing the industrial-grade lithium carbonate solid with sulfuric acid for double decomposition reaction, then sequentially adjusting the pH value by lithium hydroxide, performing plate-frame filtration, multi-medium filtration, ultrafiltration and chelate resin adsorption, electrolyzing by a bipolar membrane, and then evaporating and crystallizing to obtain the lithium hydroxide. According to the method, industrial-grade lithium carbonate is used as a raw material, and after a series of complex impurity removal processes such as pH value adjustment, plate-frame filtration, multi-medium filtration, ultrafiltration and chelate resin, high-valence ions such as Ca, Mg and Fe in a solution can only be removed, but sodium ions cannot be removed.
Patent CN107298450A discloses a method for preparing lithium hydroxide and lithium carbonate by using a soluble lithium salt solution, which comprises using lithium concentrate from salt lake as raw material, removing sodium ions by heating ball milling and slurry washing, adding sulfuric acid for acid leaching, removing impurities by resin adsorption, and performing bipolar membrane electrodialysis to obtain a lithium hydroxide solution. However, the method adopts salt lake lithium concentrate, the main component of which is lithium carbonate, sodium in the ore can be removed by simple slurry washing, and in the ore lithium extraction, sodium in spodumene cannot be removed by water washing, and only can be leached by acid leaching after roasting. Therefore, the method is applied to the process of preparing lithium hydroxide from spodumene, and sodium ions in the spodumene cannot be removed.
Disclosure of Invention
In view of the above defects, the technical problem to be solved by the present invention is to provide a method for removing sodium and potassium ions from a lithium sodium potassium solution, which can be applied to the preparation of high-purity lithium hydroxide by using spodumene as a raw material.
The invention relates to a method for removing sodium and potassium from a lithium sodium potassium solution, which comprises the following steps: performing electrodialysis on the lithium sodium potassium solution, and migrating sodium potassium ions under the action of an electric field so as to remove sodium potassium and obtain a lithium-containing solution; in the lithium sodium potassium solution, the molar ratio of Li to Na to K is 200: 4-10: 0.5-5.
Preferably, the voltage of the electrodialysis is 50-60V.
Preferably, the molar ratio of Li, Na and K in the lithium sodium potassium solution is 200:6: 1.
The second technical problem solved by the invention is to provide a method for preparing lithium hydroxide from spodumene.
The method for preparing lithium hydroxide from spodumene comprises the following steps:
1) roasting spodumene;
2) adding sulfuric acid into the roasted spodumene for acidification, adding water for leaching, and filtering to obtain a lithium sulfate mother solution;
3) removing high-valence metal ions in the lithium sulfate mother liquor to obtain a pre-electrolyte;
4) performing electrodialysis on the pre-electrolyte to remove sodium and potassium to obtain a lithium sulfate solution;
5) performing bipolar membrane electrolysis on the lithium sulfate solution to obtain a lithium hydroxide solution and dilute sulfuric acid;
6) and concentrating and crystallizing the lithium hydroxide solution to obtain a lithium hydroxide product.
Preferably, in the step 1), the roasting temperature is 1050-1350 ℃.
Preferably, in the step 2), the molar ratio of spodumene to sulfuric acid is 1-3, the acidification temperature is 200-300 ℃, and the acidification time is 1-5 hours.
Preferably, in the step 2), water is added for leaching according to the solid-liquid weight ratio of 1 (1-5).
Preferably, in the step 3), removing high-valence metal ions in the lithium sulfate mother liquor by chemical impurity removal and resin impurity removal in sequence, wherein the chemical impurity removal is to heat the lithium sulfate mother liquor to 80-95 ℃, adjust the pH to 11-14, and add carbonate to remove the high-valence metal ions; and the resin impurity removal is to remove the residual high-valence metal ions by passing the solution after chemical impurity removal through chelating resin.
Preferably, in the step 4), the voltage of the electrodialysis is 50-60V.
Preferably, the dilute sulfuric acid obtained in step 5) is concentrated and then returned to step 3) for acidification.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention aims at the principle that monovalent lithium sodium potassium ions have different migration speeds in an electric field, sodium potassium firstly passes through the membrane, so that the purpose of removing sodium potassium is achieved, the method is simple and low in cost, and sodium potassium ions in the lithium sodium potassium solution can be well removed.
(2) The method for preparing lithium hydroxide from spodumene can prepare battery-grade lithium hydroxide from spodumene; the sulfuric acid in the system can be recycled, no waste salt and waste water are generated, the environmental protection problem is solved, and industrial clean production is realized; meanwhile, in the preparation process of the lithium hydroxide, caustic soda flakes and refrigeration are not needed to be added, so that the economic value is high, sodium and potassium are removed before electrodialytic hydrogen production of the lithium hydroxide, the purity of the obtained product is greatly improved compared with that of the traditional method, the crystallization frequency can be reduced, and the battery level can be reached by direct conventional crystallization.
Drawings
FIG. 1 is a process flow for the preparation of lithium hydroxide from spodumene in example 1 of the present invention.
Detailed Description
The method for removing sodium and potassium from the lithium sodium potassium solution comprises the steps of performing electrodialysis on the lithium sodium potassium solution, and transferring sodium and potassium ions under the action of an electric field, so that the purpose of removing sodium and potassium is achieved, and finally the lithium-containing solution with high purity is obtained; in the lithium sodium potassium solution, the molar ratio of Li to Na to K is 200: 4-10: 0.5-5.
Research shows that lithium, sodium and potassium can migrate together under the action of different electric fields in the solution, but the migration rates are different, and the migration rate K is greater than Na and greater than Li, so that sodium and potassium ions can preferentially migrate out by adopting an electrodialysis method, and a lithium-containing solution with high purity can be obtained. And when the molar ratio of Li to Na to K is 200: 4-10: 0.5-5, the separation rate of Li from Na and K is high, and the migration rate of Na and K can reach 70% and the migration rate of lithium is only within 10%.
And the migration rate of K, Na is increased faster relative to Li with the increase of voltage, therefore, the voltage of electrodialysis is preferably 50-60V.
Preferably, the molar ratio of Li to Na to K is 200:6: 1. At this ratio, the increase in migration rate of K, Na is more pronounced.
Although the migration of sodium and potassium is a priority, the lithium loss increases with the migration of lithium, and therefore, in order to balance the migration of sodium and potassium with the loss of lithium as much as possible, it is preferable that the electrodialysis is stopped when the migration of sodium and potassium is 70% or more and the loss of lithium is controlled to be 10% or less. The ion content in the solution can be detected by a common detection method.
Conventional electrodialysis devices are suitable for the present invention, and bipolar membrane electrodialysis is preferred for simplicity of operation. Specifically, the method of the invention comprises the following steps: and adding the lithium sodium potassium solution into an electrodialysis device, taking the lithium sodium potassium solution as a salt solution, and performing electrodialysis through a bipolar membrane and an ion exchange membrane. Through electrodialysis, sodium and potassium ions are preferentially combined with hydroxide radicals through a cation membrane to form alkali liquor, and the salt solution for removing most of the sodium and potassium ions is used for subsequent production.
Preferably, the electrodialysis uses 20 groups of membranes to form a membrane stack, wherein 1 group of membranes is bipolar membrane + cathode membrane + anode membrane.
The method for removing sodium and potassium from the lithium sodium potassium solution is simple and low in cost, and can well remove sodium and potassium ions from the lithium sodium potassium solution.
The second technical problem solved by the invention is to provide a method for preparing lithium hydroxide from spodumene.
The method for preparing lithium hydroxide from spodumene comprises the following steps:
1) roasting spodumene;
2) adding sulfuric acid into the roasted spodumene for acidification, adding water for leaching, and filtering to obtain a lithium sulfate mother solution;
3) removing high-valence metal ions in the lithium sulfate mother liquor to obtain a pre-electrolyte;
4) performing electrodialysis on the pre-electrolyte to remove sodium and potassium to obtain a lithium sulfate solution;
5) performing bipolar membrane electrolysis on the lithium sulfate solution to obtain a lithium hydroxide solution and dilute sulfuric acid;
6) and concentrating and crystallizing the lithium hydroxide solution to obtain a lithium hydroxide product.
The method can prepare battery-grade lithium hydroxide from spodumene; meanwhile, in the preparation process of the lithium hydroxide, caustic soda flakes are not required to be added and frozen, so that the economic value is higher, sodium and potassium are removed before electrodialytic hydrogen production of the lithium oxide, the purity of the obtained product is greatly improved compared with that of the product obtained by the traditional method, and the product can reach the battery level by direct crystallization.
Wherein, the step 1) is mainly a spodumene crystal transformation process, and spodumene concentrate (Li)2O·Al2O3·4Si2O) to convert alpha-spodumene to beta-spodumene for subsequent acid leaching. Preferably, the calcination temperature is controlled to 1050 to 1350 ℃, and the transformation temperature can be controlled to change from the alpha type to the beta type according to the taste of spodumene.
And step 2) is a step of obtaining lithium sulfate mother liquor by acidification and leaching.
Before the acidification in the step 2), the roasted beta-spodumene can be cooled to below 100 ℃ and then ground to 200 meshes, and the 200-mesh screen residue is ensured not to exceed 5%, so that the acidification leaching can be better carried out.
The acidification is carried out by adding sulfuric acid, preferably, the molar ratio of spodumene to sulfuric acid is 1-3, the acidification temperature is 200-300 ℃, and the acidification time is 1-5 h. The acidification may be performed in an acidification kiln.
After acidification, the obtained acid clinker is cooled and then leached by adding water, during leaching, the mixture can be stirred to ensure that soluble lithium salt in spodumene is leached as much as possible, and then alkali or carbonate is added to neutralize redundant acid. Preferably, water is added for leaching according to the solid-liquid weight ratio of 1 (1-5).
And performing solid-liquid separation on the leached leaching slurry to obtain lithium sulfate mother liquor, wherein the concentration of lithium sulfate in the lithium sulfate mother liquor is generally 5-20%. Solid-liquid separation methods commonly used in the art are suitable for use in the present invention, such as filtration, centrifugation, and the like.
And 3) removing impurities, wherein high-valence metal ions in the lithium sulfate mother liquor are mainly removed.
The lithium sulfate mother liquor obtained in step 2) contains lithium ions, as well as monovalent metal ions such as calcium, magnesium, iron, aluminum and the like and monovalent metal ions such as sodium, potassium and the like. In order to obtain high-purity lithium hydroxide, the lithium sulfate mother liquor needs to be subjected to impurity removal.
Preferably, in the step 3), chemical impurity removal and resin impurity removal are sequentially adopted to remove high-valence metal ions in the lithium sulfate mother liquor.
And the chemical impurity removal comprises the steps of heating the lithium sulfate mother liquor to 80-95 ℃, preferably to 90 ℃, adjusting the pH to 11-14, adding carbonate to remove high-valence metal ions, and removing most of the high-valence metal ions in the lithium sulfate mother liquor after chemical impurity removal. For further purification, resin impurity removal can be carried out, wherein the resin impurity removal is to remove residual high-valence ions by passing the solution subjected to chemical impurity removal through chelating resin, so that the content of the high-valence ions in the pre-electrolyte meets the water inlet requirement of a bipolar membrane system.
Step 4) is a process for removing monovalent sodium and potassium ions. And performing electrodialysis on the pre-electrolyte to remove sodium and potassium to obtain the lithium sulfate solution with higher purity.
As described previously, the inventors of the present invention found that the migration rates of lithium sodium potassium ions in an electric field are different, and that in a lithium sulfate solution, the migration rate K (40%) > Na (35%) > Li (25%) is achieved at a conventional voltage suitable for lithium sulfate electrolysis. Therefore, electrodialysis is used to remove sodium and potassium from the pre-electrolyte.
As the voltage increases, K+、Na+Relative to Li+Increase more rapidly, especially with Li in the existing lithium sulfate system+、Na+，K+The molar ratio is about 200:6:1, K+The migration rate of (a) will be more pronounced. Preferably, the voltage of the electrodialysis is 50-60V. Specifically, the voltage of the electrodialysis may be 50V, 51V, 52V, 53V, 54V, 55V, 56V, 57V, 58V, 59V, 60V, or the like.
Although the migration of sodium and potassium is a priority, the lithium will migrate out together with the lithium, and the longer the time the lithium is lost, the more suitable time for the migration needs to be found, and in general, the electrodialysis is stopped when the sodium and potassium content in the lithium sulfate solution meets the requirements. In order to balance the sodium potassium migration and the lithium loss as much as possible, it is preferable that the sodium potassium migration is 70% or more and the electrodialysis is stopped when the lithium loss is controlled to be 10% or less. The ion content in the solution can be detected by a common detection method.
And step 5) is a bipolar membrane electrodialysis process, wherein the lithium sulfate solution with high purity after sodium and potassium are removed enters a bipolar membrane system for bipolar membrane electrolysis to obtain a lithium hydroxide solution and dilute sulfuric acid. The commonly used bipolar membrane electrodialysis devices are all suitable for the invention.
The voltage in the step 5) is continuously 50-60V which is the voltage in the step 4), however, the film is damaged to a certain extent, and in order to prolong the service life of the film, the voltage drop in the step 5) is preferably 40-50V.
The obtained lithium hydroxide solution can be used for producing lithium hydroxide products, and dilute sulfuric acid can be returned to the step 3) after being concentrated, so that the sulfuric acid is used for replacing the step sulfuric acid for acidification, the sulfuric acid is recycled, the cost can be saved, and the lithium loss can be reduced.
And 6), concentrating and crystallizing the lithium hydroxide solution to obtain the battery-grade lithium hydroxide. The concentration crystallization in the present invention may be carried out by a conventional method. For example, concentration by dialysis or evaporation. Because dialysis can only improve the concentration to 15-20%, evaporation is needed after dialysis, and evaporation can be directly carried out, but the direct evaporation cost is higher than dialysis and evaporation combination, so that dialysis concentration and evaporation concentration can be carried out after dialysis concentration in order to reduce cost.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
Example 1
Lithium hydroxide was prepared from spodumene according to the process flow in fig. 1. In particular, spodumene concentrate (Li)2O·Al2O3·4Si2O) calcining at 1100 ℃, converting alpha-type spodumene into beta-type spodumene, cooling the converted and calcined material to below 100 ℃, grinding the calcined material to 200 meshes, uniformly mixing the finely ground calcined material and concentrated sulfuric acid according to the molar ratio of 1:1.2, and then putting the mixture into an acidification kiln for acidification at 240 ℃, wherein the acidification time is 2 hours. And after acidification is finished, adding leaching water according to the solid-liquid weight ratio of 1:3, and stirring to react to leach soluble lithium salt to obtain lithium sulfate mother liquor, wherein the content of each ion in the lithium sulfate mother liquor is shown in table 1, and the data unit in table 1 is g/L.
TABLE 1
| Li2O | Na | K | Ca | Mg | Al | Fe |
| 25.5 | 1.2 | 0.3 | 0.1 | 0.1 | 0.3 | 0.2 |
Heating the lithium sulfate mother liquor to 90 ℃, adjusting the pH value to 12, adding carbonate to remove most of divalent metal ions, removing the rest high-valence ions through D402 chelating resin to obtain a pre-electrolyte, and finally removing sodium and potassium ions from the pre-electrolyte through ion migration under a 55V electric field for 20min to obtain a lithium sulfate solution meeting the electrodialysis requirement, wherein the content of each ion in the solution is shown in table 2, and the data unit in table 2 is g/L.
TABLE 2
| Li2O | Na | K | Ca | Mg | Al | Fe |
| 23.8 | 0.23 | 0.041 | ND | ND | ND | ND |
And (3) allowing the lithium sulfate solution meeting the electrodialysis requirement to enter a bipolar membrane system for bipolar membrane electrolysis to obtain a lithium hydroxide solution and dilute sulfuric acid, concentrating the lithium hydroxide solution and the dilute sulfuric acid, returning the concentrated sulfuric acid to an acidification section for acidification, and performing evaporative crystallization on the electrolyte to obtain the battery-grade lithium hydroxide.
Example 2
The migration rates of the solutions were calculated by performing electrodialysis at different voltages and times using the pre-electrolyte of example 1 as a stock solution, and the migration rates corresponding to the electrodialysis conditions at different voltages and times are shown in table 3.
Wherein, the mobility is (ion concentration in the stock solution-ion concentration after dialysis)/ion concentration in the stock solution is 100%
TABLE 3
As can be seen from table 3, when the voltage is less than 10V, sodium and potassium in the raw liquid hardly migrate, while when the voltage is 20V or more, the sodium and potassium migration rate is significantly higher than that of lithium, and as the voltage increases, the sodium and potassium migration rate increases, but the lithium migration rate also increases accordingly, and therefore, in order to extract lithium in spodumene as much as possible and increase the sodium and potassium migration rate, the voltage is preferably 50 to 60V.
Claims (8)
1. The method for removing sodium and potassium from the lithium sodium potassium solution is characterized by comprising the following steps of performing electrodialysis on the lithium sodium potassium solution, and transferring sodium and potassium ions under the action of an electric field so as to remove sodium and potassium to obtain a lithium-containing solution; in the lithium sodium potassium solution, the molar ratio of Li to Na to K is 200: 4-10: 0.5-5, and the voltage of electrodialysis is 50-60V.
2. The method for removing sodium and potassium from a lithium sodium and potassium solution according to claim 1, wherein the method comprises the following steps: in the lithium sodium potassium solution, the molar ratio of Li to Na to K is 200:6: 1.
3. A method for preparing lithium hydroxide from spodumene is characterized by comprising the following steps:
1) roasting spodumene;
2) adding sulfuric acid into the roasted spodumene for acidification, adding water for leaching, and filtering to obtain a lithium sulfate mother solution;
3) removing high-valence metal ions in the lithium sulfate mother liquor to obtain a pre-electrolyte;
4) performing electrodialysis on the pre-electrolyte to remove sodium and potassium to obtain a lithium sulfate solution, wherein the molar ratio of Li to Na to K in the lithium sodium potassium solution is 200: 4-10: 0.5-5, and the voltage of the electrodialysis is 50-60V;
5) performing bipolar membrane electrolysis on the lithium sulfate solution to obtain a lithium hydroxide solution and dilute sulfuric acid;
6) and concentrating and crystallizing the lithium hydroxide solution to obtain a lithium hydroxide product.
4. The process for preparing lithium hydroxide from spodumene according to claim 3, wherein: in the step 1), the roasting temperature is 1050-1350 ℃.
5. The process for preparing lithium hydroxide from spodumene according to claim 3, wherein: in the step 2), the molar ratio of spodumene to sulfuric acid is 1-3, the acidification temperature is 200-300 ℃, and the acidification time is 1-5 h.
6. The process for preparing lithium hydroxide from spodumene according to claim 3, wherein: in the step 2), water is added for leaching according to the solid-liquid weight ratio of 1 (1-5).
7. The process for preparing lithium hydroxide from spodumene according to claim 3, wherein: in the step 3), removing high-valence metal ions in the lithium sulfate mother liquor by chemical impurity removal and resin impurity removal in sequence, wherein the chemical impurity removal is to heat the lithium sulfate mother liquor to 80-95 ℃, adjust the pH to 11-14, and add carbonate to remove the high-valence metal ions; and the resin impurity removal is to remove the residual high-valence metal ions by passing the solution after chemical impurity removal through chelating resin.
8. The process for preparing lithium hydroxide from spodumene according to claim 3, wherein: after concentrating the dilute sulfuric acid obtained in the step 5), returning to the step 3) for acidification.
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| CN115124053A (en) * | 2022-07-19 | 2022-09-30 | 浙江新锂想科技有限责任公司 | Method for extracting and preparing lithium product from lepidolite by adopting composite adsorption resin |
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