CN113387374B - Potassium removal process of ore lithium extraction production system - Google Patents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D15/00—Lithium compounds
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- C—CHEMISTRY; METALLURGY
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- C01D15/00—Lithium compounds
- C01D15/06—Sulfates; Sulfites
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- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D15/00—Lithium compounds
- C01D15/08—Carbonates; Bicarbonates
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- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/009—Compounds containing, besides iron, two or more other elements, with the exception of oxygen or hydrogen
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Abstract
The invention discloses a potassium removing process of an ore lithium extraction production system, which belongs to the field of hydrometallurgy, in particular to the field of lithium salt production, and aims to solve the problems of long potassium removing process flow and high potassium removing operation difficulty in the existing lepidolite, and comprises the following steps: neutralizing and evaporating to obtain sodium nitrate to obtain potassium-rich sodium precipitation mother liquor; adding ferric salt into the potassium-enriched sodium precipitation mother solution after pH adjustment to obtain potassium-containing mother solution; heating the potassium-containing mother liquor to 95 ℃, and stirring to react and crystallize for 1-3h to obtain a suspension; settling the suspension, performing solid-liquid separation, and regulating the pH of the supernatant to 5-7 by adopting calcium carbonate to remove iron. The process flow is short, the control is convenient, the subsequent impurity removal is simple, and the process flow is compatible with the sulfuric acid method lithium extraction process, and is simple and easy to implement.
Description
Technical Field
The invention discloses a potassium removal process of an ore lithium extraction production system, belongs to the technical field of hydrometallurgy, and particularly relates to the technical field of lithium salt production.
Background
Spodumene is always the main raw material for extracting lithium, and has simple composition, high lithium-containing grade and Li 2 O theory 8.03%, but due to sodium potassium substitution, li is generally 2 O content is 2.91-7.66% (Su Hui, etc., research on extraction and recovery of lithium from ore resources progresses chemical engineering report, 2019, 70 (1): 10-23.). K impurity outlets are fewer in the production process of lithium carbonate and lithium hydroxide, so that K is continuously enriched in the production mother liquor in the long-term production process, and the pollution of potassium products is easy to cause. Generally, K in a lithium hydroxide production line is enriched in primary evaporation mother liquor, and K in a lithium carbonate production line is enriched in sodium precipitation mother liquor.
At present, potassium in a production system is mainly removed through a sodium sulphate working section, and the method is simple and easy to implement, but has some problems. For example, although K in the production system can be partially separated out along with sodium sulfate crystallization in the process of evaporation, common K salts are all soluble compounds, so most K can be enriched in sodium precipitation mother liquor and remain in the production system, and the quality can be still affected. Meanwhile, the particle size of the formed potassium sulfate is smaller after evaporation, separation is difficult, and the production efficiency is affected. Although there are also some manufacturers attempting to selectively separate Li-K after precipitation of lithium from the mother liquor. However, lithium carbonate is a slightly soluble substance, and Li-K is difficult to separate; although lithium phosphate is an insoluble precipitate, subsequent recovery of lithium from lithium phosphate is also a problem. Patent (CN 102010991B) describes the production of lithium carbonate by potassium removal from lepidolite by means of the formation of potassium aluminum sulfate at low temperature. However, the process flow is long, and the formed aluminum potassium sulfate is a soluble substance, and the solubility of the aluminum potassium sulfate is obviously affected by temperature. Therefore, the method has higher operation difficulty in removing potassium and is not popularized in a large range temporarily.
Disclosure of Invention
The invention aims at: the potassium removing process of the ore lithium extraction production system is provided to solve the problems that the existing potassium removing process flow in lepidolite is long, the formed aluminum potassium sulfate has obvious solubility influenced by temperature, and the operation difficulty of removing potassium is high.
The technical scheme adopted by the invention is as follows:
a potassium removing process of an ore lithium extraction production system comprises the following steps:
step 1, regulating the pH value of a lithium precipitation potassium-containing mother solution of a lithium carbonate production line to 1-3 by using concentrated sulfuric acid to obtain a neutralization precursor;
step 2, primary evaporating the potassium-rich mother liquor by using a lithium hydroxide production line to adjust the pre-neutralization solution to 5-8 so as to obtain post-neutralization solution;
step 3, evaporating the neutralized liquid to obtain nitrate to generate potassium-rich sodium precipitation mother liquor;
step 4, adding ferric salt into the potassium-rich sodium precipitation mother liquor generated in the step 3 to obtain a potassium-containing mother liquor;
step 5, heating the potassium-containing mother liquor to 95 ℃, and stirring, reacting and crystallizing for 1-3h to obtain a suspension;
and 6, settling the suspension to perform solid-liquid separation, and regulating the pH of supernatant to 5-7 by adopting calcium carbonate to remove iron.
In the technical scheme, carbonate in the neutralization front liquid is removed firstly, then the neutralization front liquid is regulated to be neutral by using a lithium hydroxide production line to evaporate potassium-rich mother liquid once, the neutralization rear liquid is evaporated by an MVR system to obtain potassium-rich sodium-separating mother liquid with K content of 1.8-8.2g/L, the potassium-rich sodium-separating mother liquid comprises lithium sulfate, potassium sulfate and sodium sulfate, the pH of the potassium-rich sodium-separating mother liquid is regulated to 1.5-2.5 by using concentrated sulfuric acid, then ferric salt is added, the temperature is raised, stirring and crystallization are carried out, and the suspension is obtained, wherein the crystal comprises jarosite KFE 3 (SO 4 ) 2 (OH) 6 The crystallized solution comprises lithium sulfate, potassium sulfate and ferric sulfate, the suspension is settled for solid-liquid separation, the supernatant fluid is low-potassium mother liquor, calcium carbonate is adopted to adjust pH to 5-7 for iron removal, and the solid-liquid separation is carried out after iron removal, so that the obtained low-potassium lithium sulfate solution is returned to the lithium sulfate purification section. The pH value of the potassium-rich sodium precipitation mother liquor generated in the step 3 is adjusted to 1.5-2.5 by 98wt% concentrated sulfuric acid, then ferric salt is added to obtain potassium-containing mother liquor, the molar ratio of iron to potassium is 2.4-4.5, the potassium-containing mother liquor is heated, stirred, reacted and crystallized, and solid-liquid separation is carried out to obtain the crystal jarosite KFe 3 (SO 4 ) 2 (OH) 6 Namely, the potassium enriched in the mother liquor of the production system is converted into insoluble precipitate to be discharged out of the system, so that the pollution of the lithium salt product potassium of the product caused by the enrichment of the mother liquor of the production system is avoided. Compared with the existing process, the process flow is short, the control is convenient, the subsequent impurity removal is simple, and the process is compatible with the sulfuric acid method lithium extraction process, and is simple and easy to implement.
Preferably, the concentrated sulfuric acid in step 1 is 98wt%.
Preferably, the potassium-enriched sodium precipitation mother liquor in the step 3 contains 1.8-8.2g/L of potassium.
More preferably, the potassium-rich sodium precipitation mother liquor comprises lithium sulfate, potassium sulfate and sodium sulfate.
Preferably, in step 4, 98wt% concentrated sulfuric acid is used to adjust the pH of the potassium-rich sodium precipitation mother liquor generated in step 3 to 1.5-2.5, and then ferric salt is added.
Preferably, in step 4, the molar ratio of iron to potassium is 2.4-4.5.
Preferably, in step 4, the crystals comprise jarosite, and the solution after crystallization comprises lithium sulfate, potassium sulfate, and ferric sulfate.
Preferably, in the step 5, the stirring intensity is 180-220r/min.
Preferably, the supernatant in step 6 is the low potassium mother liquor.
Preferably, the low-potassium lithium sulfate solution obtained by solid-liquid separation after iron removal in the step 6 is returned to the lithium sulfate purification section.
A potassium removing process of an ore lithium extraction production system comprises the following steps:
step 1, regulating the pH value of a lithium precipitation potassium-containing mother solution of a lithium carbonate production line to 1-3 by using 98wt% concentrated sulfuric acid, so as to remove carbonate in a neutralization precursor solution;
the chemical reaction scheme involved in step 1 is as follows:
step 2, primary evaporating the potassium-rich mother liquor by using a lithium hydroxide production line to adjust the pre-neutralization solution to 5-8 so as to obtain post-neutralization solution;
step 3, evaporating the neutralized solution to obtain potassium-enriched sodium-precipitating mother liquor with potassium content of 1.8-8.2g/L, wherein the potassium-enriched sodium-precipitating mother liquor comprises lithium sulfate, potassium sulfate and sodium sulfate;
step 4, adjusting the pH value of the potassium-rich sodium precipitation mother liquor generated in the step 3 to 1.5-2.5 by using 98wt% concentrated sulfuric acid, and then adding ferric salt to obtain a potassium-containing mother liquor, wherein the molar ratio of the iron to the potassium is 2.4-4.5;
step 5, heating the potassium-containing mother liquor to 95 ℃, stirring, reacting and crystallizing for 1-3 hours, and stirring for 180-220r/min to obtain a suspension; the chemical reactions involved are as follows:
3Fe 2 (SO 4 ) 3 +K 2 SO 4 +12H 2 O＝2KFe 3 (SO 4 ) 2 (OH) 6 (s)+6H 2 SO 4
the crystal comprises jarosite KFE 3 (SO 4 ) 2 (OH) 6
The crystallized solution comprises lithium sulfate, potassium sulfate and ferric sulfate.
Step 6, settling the suspension to perform solid-liquid separation, and regulating the pH of supernatant, namely the low-potassium mother solution, to 5-7 by adopting calcium carbonate to remove iron;
the chemical reactions involved are as follows:
CaCO 3 +H + ＝＝Ca 2+ +CO 2 (g)+H 2 O
Fe 3+ +OH - ＝＝Fe(OH) 3 (s)
the liquid comprises lithium sulfate, sodium sulfate and calcium sulfate;
and 7, removing iron in the step 6, performing solid-liquid separation, and returning the obtained low-potassium lithium sulfate solution to a lithium sulfate purification section.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the potassium removing scheme of the production mother liquor is efficient, simple and compatible with the existing main process;
2. in the invention, the pH value of the potassium-enriched sodium-precipitating mother solution generated in the step 3 is adjusted to 1.5-2.5 by using 98wt% concentrated sulfuric acid, then ferric salt is added to obtain a potassium-containing mother solution, the molar ratio of iron to potassium is 2.4-4.5, the potassium-containing mother solution is heated, stirred, reacted and crystallized, and solid-liquid separation is carried out to obtain the crystalline jarosite KFe 3 (SO 4 ) 2 (OH) 6 Namely, the potassium enriched in the mother liquor of the production system is converted into insoluble precipitate and discharged out of the system, so that the pollution of the lithium salt product potassium of the product caused by the enrichment of the mother liquor of the production system is avoided;
3. in the invention, the crystal is jarosite KFe 3 (SO 4 ) 2 (OH) 6 Instead of aluminum potassium sulfate, the operation is simple;
4. compared with the existing process, the process flow is short, the control is convenient, the subsequent impurity removal is simple, and the process is compatible with the sulfuric acid method lithium extraction process;
5. in the invention, the potassium removal efficiency of the ore lithium extraction production system is high, and the method is simple and easy to implement.
Drawings
FIG. 1 is a flow chart of a potassium removal process of an ore lithium extraction production system of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, a potassium removal process of an ore lithium extraction production system comprises the following steps:
step 1, regulating the pH value of a lithium precipitation potassium-containing mother solution of a lithium carbonate production line to 3 by using 98wt% concentrated sulfuric acid, so as to remove carbonate in a neutralization precursor solution;
step 2, primary evaporating the potassium-rich mother liquor by using a lithium hydroxide production line to adjust the neutralization pre-liquid to 7 so as to obtain a neutralization post-liquid;
step 3, evaporating the neutralized solution to obtain potassium-enriched sodium-precipitating mother liquor with potassium content of 5g/L, wherein the potassium-enriched sodium-precipitating mother liquor comprises lithium sulfate, potassium sulfate and sodium sulfate;
step 4, adjusting the pH value of the potassium-rich sodium precipitation mother liquor generated in the step 3 to 2 by using 98wt% concentrated sulfuric acid, and then adding ferric sulfate to obtain a potassium-containing mother liquor, wherein the molar ratio of the iron to the potassium is 4.5;
step 5, heating the potassium-containing mother liquor to 95 ℃, stirring, reacting and crystallizing for 2 hours, and stirring for 180r/min to obtain a suspension;
the crystal comprises jarosite KFE 3 (SO 4 ) 2 (OH) 6
The crystallized solution comprises lithium sulfate, potassium sulfate and ferric sulfate.
Step 6, settling the suspension to perform solid-liquid separation, and regulating the pH value of supernatant, namely the low-potassium mother solution, to 6 by adopting calcium carbonate to remove iron;
the liquid comprises lithium sulfate, sodium sulfate and calcium sulfate;
and 7, removing iron in the step 6, performing solid-liquid separation, and returning the obtained low-potassium lithium sulfate solution to a lithium sulfate purification section.
Results:
the concentration of K before treatment is 5.0g/L; k concentration after treatment is 0.96g/L and Fe concentration is 0.011g/L
Iron slag solids: li (Li) 2 O:0.44％；Na 2 O:0.60％；K 2 O:6.95％；Fe 2 O 3 :42.86％。
Example 2
As shown in fig. 1, a potassium removal process of an ore lithium extraction production system comprises the following steps:
step 1, regulating the pH value of a lithium precipitation potassium-containing mother solution of a lithium carbonate production line to 2 by using 98wt% concentrated sulfuric acid, so as to remove carbonate in a neutralization precursor solution;
step 2, primary evaporation of the potassium-rich mother liquor by using a lithium hydroxide production line is carried out to adjust the neutralization pre-liquid to 5, and the neutralization post-liquid is obtained;
step 3, evaporating the neutralized solution to obtain a potassium-enriched sodium precipitation mother solution with the potassium content of 1.8g/L, wherein the potassium-enriched sodium precipitation mother solution comprises lithium sulfate, potassium sulfate and sodium sulfate;
step 4, adjusting the pH value of the potassium-rich sodium precipitation mother liquor generated in the step 3 to 1.5 by using 98wt% concentrated sulfuric acid, and then adding ferric sulfate to obtain a potassium-containing mother liquor, wherein the molar ratio of the iron to the potassium is 3.75;
step 5, heating the potassium-containing mother liquor to 95 ℃, stirring, reacting and crystallizing for 3 hours, and stirring for 220r/min to obtain a suspension;
the crystal comprises jarosite KFE 3 (SO 4 ) 2 (OH) 6
The crystallized solution comprises lithium sulfate, potassium sulfate and ferric sulfate.
Step 6, settling the suspension to perform solid-liquid separation, and regulating the pH value of supernatant, namely the low-potassium mother solution, to 6 by adopting calcium carbonate to remove iron;
the liquid comprises lithium sulfate, sodium sulfate and calcium sulfate;
and 7, removing iron in the step 6, performing solid-liquid separation, and returning the obtained low-potassium lithium sulfate solution to a lithium sulfate purification section.
Results:
the concentration of K before treatment is 1.8g/L; k concentration after treatment is 0.44g/L and Fe concentration is 0.0064g/L
Iron slag solids: li (Li) 2 O:0.20％；Na 2 O:0.63％；K 2 O:5.87％；Fe 2 O 3 :39.06％。
Example 3
As shown in fig. 1, a potassium removal process of an ore lithium extraction production system comprises the following steps:
step 1, regulating the pH value of a lithium precipitation potassium-containing mother solution of a lithium carbonate production line to 1 by using 98wt% concentrated sulfuric acid, so as to remove carbonate in a neutralization precursor solution;
step 2, primary evaporating the potassium-rich mother liquor by using a lithium hydroxide production line to adjust the neutralization pre-liquid to 6 so as to obtain a neutralization post-liquid;
step 3, evaporating the neutralized solution to obtain potassium-enriched sodium-precipitating mother liquor with potassium content of 8.2g/L, wherein the potassium-enriched sodium-precipitating mother liquor comprises lithium sulfate, potassium sulfate and sodium sulfate;
step 4, adjusting the pH value of the potassium-rich sodium precipitation mother liquor generated in the step 3 to 2.5 by using 98wt% concentrated sulfuric acid, and then adding ferric sulfate to obtain a potassium-containing mother liquor, wherein the molar ratio of the iron to the potassium is 3.75;
step 5, heating the potassium-containing mother liquor to 95 ℃, stirring, reacting and crystallizing for 3 hours, and stirring for 200r/min to obtain a suspension;
the crystal comprises jarosite KFE 3 (SO 4 ) 2 (OH) 6
The crystallized solution comprises lithium sulfate, potassium sulfate and ferric sulfate.
Step 6, settling the suspension to perform solid-liquid separation, and regulating the pH value of supernatant, namely the low-potassium mother solution, to 6 by adopting calcium carbonate to remove iron;
the liquid comprises lithium sulfate, sodium sulfate and calcium sulfate;
and 7, removing iron in the step 6, performing solid-liquid separation, and returning the obtained low-potassium lithium sulfate solution to a lithium sulfate purification section.
Results:
the concentration of K before treatment is 8.2g/L; after treatment, the concentration of K is 1.9g/L and the concentration of Fe is 0.0069g/L
Iron slag solids: li (Li) 2 O:0.45％；Na 2 O:0.71％；K 2 O:6.03％；Fe 2 O 3 :43.87％。
Example 4
As shown in fig. 1, a potassium removal process of an ore lithium extraction production system comprises the following steps:
step 1, regulating the pH value of a lithium precipitation potassium-containing mother solution of a lithium carbonate production line to 3 by using 98wt% concentrated sulfuric acid, so as to remove carbonate in a neutralization precursor solution;
step 2, primary evaporating the potassium-rich mother liquor by using a lithium hydroxide production line to adjust the neutralization pre-liquid to 7 so as to obtain a neutralization post-liquid;
step 3, evaporating the neutralized solution to obtain potassium-enriched sodium-precipitating mother liquor with potassium content of 5.0g/L, wherein the potassium-enriched sodium-precipitating mother liquor comprises lithium sulfate, potassium sulfate and sodium sulfate;
step 4, adjusting the pH value of the potassium-rich sodium precipitation mother liquor generated in the step 3 to 2 by using 98wt% concentrated sulfuric acid, and then adding ferric sulfate to obtain a potassium-containing mother liquor, wherein the molar ratio of the iron to the potassium is 2.4;
step 5, heating the potassium-containing mother liquor to 95 ℃, stirring, reacting and crystallizing for 2 hours, and stirring for 200r/min to obtain a suspension;
the crystal comprises jarosite KFE 3 (SO 4 ) 2 (OH) 6
The crystallized solution comprises lithium sulfate, potassium sulfate and ferric sulfate.
Step 6, settling the suspension to perform solid-liquid separation, and regulating the pH value of supernatant, namely the low-potassium mother solution, to 6 by adopting calcium carbonate to remove iron;
the liquid comprises lithium sulfate, sodium sulfate and calcium sulfate;
and 7, removing iron in the step 6, performing solid-liquid separation, and returning the obtained low-potassium lithium sulfate solution to a lithium sulfate purification section.
Results:
the concentration of K before treatment is 5.0g/L; after treatment, the concentration of K is 2.1g/L and the concentration of Fe is 0.011g/L
Iron slag solids: li (Li) 2 O:0.53％；Na 2 O:2.8％；K 2 O:4.84％；Fe 2 O 3 :39.12％。
Example 5
As shown in fig. 1, a potassium removal process of an ore lithium extraction production system comprises the following steps:
step 1, regulating the pH value of a lithium precipitation potassium-containing mother solution of a lithium carbonate production line to 3 by using 98wt% concentrated sulfuric acid, so as to remove carbonate in a neutralization precursor solution;
step 2, primary evaporating the potassium-rich mother liquor by using a lithium hydroxide production line to adjust the neutralization pre-liquid to 7 so as to obtain a neutralization post-liquid;
step 3, evaporating the neutralized solution to obtain potassium-enriched sodium-precipitating mother liquor with potassium content of 5.0g/L, wherein the potassium-enriched sodium-precipitating mother liquor comprises lithium sulfate, potassium sulfate and sodium sulfate;
step 4, adjusting the pH value of the potassium-rich sodium precipitation mother liquor generated in the step 3 to 2 by using 98wt% concentrated sulfuric acid, and then adding ferric sulfate to obtain a potassium-containing mother liquor, wherein the molar ratio of the iron to the potassium is 3.75;
step 5, heating the potassium-containing mother liquor to 95 ℃, stirring, reacting and crystallizing for 1h, and stirring for 200r/min to obtain a suspension;
the crystal comprises jarosite KFE 3 (SO 4 ) 2 (OH) 6
The crystallized solution comprises lithium sulfate, potassium sulfate and ferric sulfate.
Step 6, settling the suspension to perform solid-liquid separation, and regulating the pH value of supernatant, namely the low-potassium mother solution, to 6 by adopting calcium carbonate to remove iron;
the liquid comprises lithium sulfate, sodium sulfate and calcium sulfate;
and 7, removing iron in the step 6, performing solid-liquid separation, and returning the obtained low-potassium lithium sulfate solution to a lithium sulfate purification section.
Results:
the concentration of K before treatment is 5.0g/L; k concentration after treatment is 0.74g/L and Fe concentration is 0.013g/L
Iron slag solids: li (Li) 2 O:0.31％；Na 2 O:0.74％；K 2 O:6.23％；Fe 2 O 3 :39.99％。
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The potassium removing process of the ore lithium extraction production system is characterized by comprising the following steps of:
step 1, regulating the pH value of a lithium precipitation potassium-containing mother solution of a lithium carbonate production line to 1-3 by using concentrated sulfuric acid to obtain a neutralization precursor;
step 2, primary evaporating the potassium-rich mother liquor by using a lithium hydroxide production line to adjust the pre-neutralization solution to 5-8 so as to obtain post-neutralization solution;
step 3, evaporating the neutralized solution to obtain a potassium-rich sodium-precipitating mother solution, wherein the potassium-rich sodium-precipitating mother solution comprises lithium sulfate, potassium sulfate and sodium sulfate, and the potassium-rich sodium-precipitating mother solution contains 1.8-8.2g/L of potassium;
step 4, adding ferric salt into the potassium-rich sodium precipitation mother liquor generated in the step 3 to obtain a potassium-containing mother liquor; wherein the molar ratio of iron to potassium is 2.4-4.5;
step 5, heating the potassium-containing mother liquor to 95 ℃, and stirring, reacting and crystallizing for 1-3h to obtain a suspension; the crystal comprises jarosite, and the crystallized solution comprises lithium sulfate, potassium sulfate and ferric sulfate;
and 6, settling the suspension to perform solid-liquid separation, and regulating the pH of supernatant to 5-7 by adopting calcium carbonate to remove iron.
2. The process for removing potassium in an ore lithium extraction production system according to claim 1, wherein the concentrated sulfuric acid in step 1 is 98wt%.
3. The process for removing potassium in an ore lithium extraction production system according to claim 1, wherein in step 4, 98wt% concentrated sulfuric acid is used to adjust the pH of the potassium-rich sodium precipitation mother liquor produced in step 3 to 1.5-2.5, and then ferric salt is added.
4. The process for removing potassium in an ore lithium extraction production system according to claim 1, wherein in the step 5, the stirring intensity is 180-220r/min.
5. The process for removing potassium in an ore lithium extraction production system according to claim 1, wherein the supernatant in step 6 is a low-potassium mother liquor.
6. The potassium removing process of the ore lithium extraction production system according to claim 1, wherein solid-liquid separation is performed after iron removal in the step 6, and the obtained low-potassium lithium sulfate solution is returned to the lithium sulfate purification section.
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| CN102115101B (en) * | 2011-01-05 | 2013-09-04 | 屈俊鸿 | Novel method for producing lithium carbonate and lithium hydroxide |
| CN107739039A (en) * | 2017-10-16 | 2018-02-27 | 福州大学 | A kind of method that defluorinate lepidolite pipeline dissolution carries lithium |
| CN108002411B (en) * | 2017-12-12 | 2019-09-13 | 福州大学 | A kind of method that the dissolution of defluorinate lepidolite multistage pressure tank mentions lithium |
| CN108584993A (en) * | 2018-08-15 | 2018-09-28 | 广西锰华新能源科技发展有限公司 | A kind of method that sodium potassium ion is removed in lithium salts production process |
| CN109336138B (en) * | 2018-12-21 | 2020-11-10 | 中国科学院过程工程研究所 | Method for separating potassium and sodium in mixed sulfate containing potassium and sodium |
| CN110923452A (en) * | 2019-11-11 | 2020-03-27 | 中南大学 | Process for recovering potassium and sodium salts from lithium-precipitated liquid of lepidolite by using ethanol |
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| WO2020107074A1 (en) * | 2018-11-29 | 2020-06-04 | ICSIP Pty Ltd | Production of lithium chemicals and metallic lithium |
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