CN113999970B - Method for extracting lithium from lithium porcelain stone mineral by roasting through mixed sulfate process - Google Patents
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- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
- C22B3/08—Sulfuric acid, other sulfurated acids or salts thereof
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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
- C01D15/06—Sulfates; Sulfites
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- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/10—Obtaining alkali metals
- C22B26/12—Obtaining lithium
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- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
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Abstract
The invention provides a method for extracting lithium from lithium porcelain stone minerals by roasting with a mixed sulfate method, which comprises the working procedures of crushing the lithium porcelain stone, mixing with compound salt, roasting, grinding, acidizing and leaching, separating, washing and the like. The method of the invention achieves the purposes of reducing the production cost of lithium extraction and improving the recovery rate and leaching rate of lithium ores by controlling the ingredients, optimizing the process chain, controlling the nodes in the roasting process and the like, and the invention has short process flow and is beneficial to realizing industrial production.
Description
Technical Field
The invention belongs to the technical field of metal extraction, and particularly relates to a method for extracting lithium from lithium porcelain stone minerals by roasting through a mixed sulfate process.
Background
In recent years, development and utilization of lithium have been rapidly progressed with large-scale application of new energy. The development and the comprehensive utilization of resources of the efficient clean process for extracting lithium from the ore are the necessary trend of the development of the field. On the basis of analyzing the composition and structural characteristics of lithium ores, the lithium extraction technology such as an acid method, an alkali method and a salt method can be adopted, but the method in the prior art has the problems of high energy consumption, long process flow, large corrosion to equipment in the production process, easy environmental pollution and the like, and is often difficult to apply to industrial production. Lithium is extracted from lithium ores, mainly depends on minerals such as spodumene and lepidolite, but the methods consume a large amount of energy sources in actual production, generate higher production cost and lithium slag, cause great waste of lithium resources in the refining process, and cannot be fully and comprehensively utilized, so that the production cost is increased. It is therefore important to find an economical, simple, and efficient method for extracting lithium from lithium ores.
Disclosure of Invention
The invention aims to provide a technology for extracting lithium from low-grade lithium porcelain stone minerals, which comprises the working procedures of crushing the lithium porcelain stone, mixing the lithium porcelain stone with compound salt, roasting, grinding, acidizing and leaching, separating, washing and the like. The method of the invention achieves the purposes of reducing the production cost of lithium extraction and improving the recovery rate and leaching rate of lithium ores by controlling the ingredients, optimizing the process chain, controlling the nodes in the roasting process and the like, and the invention has short process flow and is beneficial to realizing industrial production.
The technical scheme provided by the invention is as follows:
the invention provides a method for extracting lithium from lithium porcelain stone minerals by mixed sulfate roasting, which comprises the following steps:
s1, crushing: coarse crushing, medium crushing and fine crushing are carried out on the lithium porcelain stone, sieving is carried out, the undersize is carried out after being ground by a ball mill, then sieving is carried out, a magnetic separator is used for removing weak magnetic iron minerals, and then fine grinding and powder treatment are carried out, thus obtaining broken lithium porcelain stone materials;
s2, mixing: placing the crushed lithium porcelain stone material and a compound salt into a mixer to be fully and uniformly mixed to obtain a roasting raw material, wherein the compound salt is a mixture of sodium sulfate, calcium sulfate and calcium carbonate, and the mass ratio of the crushed lithium porcelain stone material to the sodium sulfate, the calcium sulfate and the calcium carbonate is 1.28:2.9-3.1:3.5-3.7:0.5-0.7;
s3, roasting: the mixed roasting raw materials are subjected to rotary roasting in a roasting kiln, the temperature is controlled to be 880-900 ℃, the roasting time is 0.5-1.2 h, mechanical crushing ball milling is carried out after roasting, and grinding powder is processed to 160-200 meshes, so as to obtain roasting sand crushing fine powder;
s4, hot water acidification leaching: adding water into the calcined fine powder, fully stirring and mixing, adjusting the pH value to 5-6 by dilute sulfuric acid, performing leaching water washing treatment, wherein the temperature of water is 60-70 ℃ and the leaching time is 0.5-1 h, so as to obtain a lithium sulfate salt solid-liquid mixture;
s5, solid-liquid separation and water washing: carrying out solid-liquid separation on the lithium sulfate solid-liquid mixture through a filtering device to obtain filter residues and filtrate, carrying out countercurrent washing on the filter residues for 5 times by using water, and combining the washing liquid and the filtrate to obtain a lithium preparation solution;
s6, preparing lithium or lithium salt: evaporating and concentrating the lithium preparation solution to obtain refined lithium solution, adding sodium hydroxide and EDTA into the lithium preparation solution, performing adsorption and purification treatment by using activated carbon, neutralizing and concentrating to obtain concentrated solution, and preparing lithium sulfate product or precipitating lithium to prepare industrial grade lithium carbonate.
Further, in the step S2, the mass ratio of the broken lithium porcelain stone material, sodium sulfate, calcium sulfate and calcium carbonate is 1.28:3.0:3.6:0.6.
Further, in the step S4, the mass ratio of the calcined fine powder to the water is 1:4.
In the step S5, after the filter residue is subjected to countercurrent washing for 5 times, the concentration of lithium ions in the filter residue is less than or equal to 0.09wt%.
In the step S6, the concentration content of lithium ions in the concentrated solution is 11-13 g/L.
Further, in the step S6, ca in the concentrated solution 2+ 、Mg 2+ 、Fe 3+ 、Mn 2+ 、F-、Al 3+ The ion mass concentration is less than or equal to 0.07wt%.
The beneficial effects obtained by the invention are as follows:
the invention adopts the crushed lithium porcelain stone and the compound salt with specific proportion as roasting materials, and the lithium porcelain stone and the compound salt are subjected to working procedures such as roasting, grinding, acidification leaching, separation, washing and the like, and the production cost of lithium extraction can be reduced, the recovery rate and the leaching rate of lithium ore are improved through controlling the ingredients, the process chain optimization and the nodes in the roasting process, and the lithium ion concentration in the lithium slag is less than or equal to 0.09wt% and the leaching rate of lithium is as high as 99.5%. Meanwhile, the method has short process flow and is beneficial to realizing industrial production.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
The lithium porcelain stone used in the test example of the invention has the compositions shown in tables 1 and 2 after detection.
The lithium porcelain stone is mainly made of SiO 2 、Al 2 O 3 、Li 2 O、K 2 O、Na 2 O and other components, mainly produced in Jiangxi Yichun.
TABLE 1 lithiumstone petrochemistry multi-element analysis results (wt%)
| Element(s) | Li 2 O | SiO 2 | Al 2 O 3 | K 2 O | Na 2 O |
| Content of | 0.57 | 71.43 | 16.19 | 3.95 | 3.62 |
| Element(s) | CaO | MgO | Fe 2 O 3 | TiO 2 | P |
| Content of | 0.29 | 0.13 | 0.71 | 0.02 | 0.02 |
TABLE 2 analysis results of mineral composition of LiFerite (wt%)
As can be seen from tables 1 and 2, lithium is a valuable metal mainly recovered from ores; the ore mainly comprises manganese-rich tantalum-niobium iron ore, fine-grain stone, tantalum-containing cassiterite and lepidolite, and gangue minerals comprise feldspar, quartz, a small amount of yellow jade and the like.
Comparative example 1
The method for extracting lithium from the lithium porcelain stone raw material comprises the following steps:
s1, crushing: coarse crushing, medium crushing and fine crushing the lithium porcelain Dan Xian by a jaw crusher, sieving, grinding the undersize material by a ball mill, sieving by a high-frequency vibrating screen, removing weak magnetic iron minerals by a high-gradient magnetic separator with the magnetic field intensity of the magnetic pole surface of H=1500A/m, and grinding into fine powder to obtain crushed lithium porcelain stone;
s2, mixing: placing the broken lithium porcelain stone material, potassium sulfate and calcium carbonate into a mixer according to the mass ratio of 1.0:5:0.3, and fully and uniformly mixing to obtain a roasting raw material;
s3, roasting: the mixed roasting raw materials are subjected to rotary roasting in a roasting kiln, the temperature is controlled to be 900 ℃, the roasting time is 1.0h, mechanical crushing ball milling is carried out after roasting, and grinding powder is processed to 200 meshes, so that roasted fine powder is obtained;
s4, acidizing and leaching: adding water into the roasting fine powder, fully stirring and mixing, adjusting the pH value of the roasting fine powder and the water to 6.0 by using 30% dilute sulfuric acid according to the mass ratio of 1:3, performing leaching water washing treatment, wherein the temperature of the water is 60 ℃, and the leaching time is 0.8h, so that lithium in the roasting fine powder is fully released and enters the liquid to obtain a lithium sulfate salt solid-liquid mixture;
s5, solid-liquid separation and water washing: carrying out solid-liquid separation on the lithium sulfate solid-liquid mixture through a filtering device to obtain filter residues and filtrate, carrying out countercurrent washing on the filter residues for 5 times, combining the washing liquid and the filtrate to obtain a lithium preparation solution, wherein the filter residues can be used as raw materials of ceramics, the filtering device is a ceramic disc filter, and the content of lithium ions in the washed filter residues is detected to be 0.164wt%;
s6, preparing lithium or lithium salt: adding sodium hydroxide solution into the lithium preparation solution to adjust the pH value to 12.0, adding EDTA (ethylene diamine tetraacetic acid) with the theoretical amount of 1.4 times for concentration reaction for 30min, then carrying out adsorption, filtration and purification treatment by using powdered activated carbon, neutralizing and concentrating to obtain a concentrated solution, wherein the concentration content of lithium ions in the concentrated solution is 11.4g/L, and the obtained concentrated solution can be used for preparing lithium sulfate products or precipitating lithium to prepare industrial grade lithium carbonate. Control of Ca in the solution of this step 2+ 、Mg 2+ 、Fe 3+ 、Mn 2+ 、F-、Al 3+ And (3) filtering and separating the solid-liquid mixed solution when the ion mass concentration is less than or equal to 0.07%. The lithium leaching rate of the method is 82.4 percent through calculation.
Comparative example 2
The method for extracting lithium from the lithium porcelain stone raw material comprises the following steps:
s1, crushing: coarse crushing, medium crushing and fine crushing the lithium porcelain Dan Xianxian by a jaw crusher, sieving, grinding the undersize material by a ball mill, sieving by a high-frequency vibrating screen, removing weak magnetic iron minerals by a high-gradient magnetic separator with the magnetic field intensity of the magnetic pole surface of H=1500A/m, and grinding into fine powder to obtain crushed lithium porcelain stone;
s2, mixing: placing the broken lithium porcelain stone material, sodium sulfate and calcium sulfate in a mass ratio of 1.28:3.5:3.5 into a mixer, and fully and uniformly mixing to obtain a roasting raw material;
s3, roasting: the mixed roasting raw materials are subjected to rotary roasting in a roasting kiln, the temperature is controlled to be 900 ℃, the roasting time is 1.0h, mechanical crushing ball milling is carried out after roasting, and grinding powder is processed to 200 meshes, so that roasted fine powder is obtained;
s4, hot water acidification leaching: adding water into the roasting fine powder, fully stirring and mixing, wherein the mass ratio of the roasting fine powder to the water is 1:4, regulating the pH value to 6.0 by using 30% dilute sulfuric acid, performing leaching water washing treatment, wherein the temperature of the water is 70 ℃, and the leaching time is 0.8h, so that lithium in the roasting fine powder is fully released and enters into liquid, and a lithium sulfate salt solid-liquid mixture is obtained;
s5, solid-liquid separation and water washing: carrying out solid-liquid separation on the lithium sulfate solid-liquid mixture through a filtering device to obtain filter residues and filtrate, carrying out countercurrent washing on the filter residues for 5 times, combining the washing liquid and the filtrate to obtain a lithium preparation solution, wherein the filter residues can be used as raw materials of ceramics, the filtering device is a ceramic disc filter, and the content of lithium ions in the washed filter residues is detected to be 0.227wt%;
s6, preparing lithium or lithium salt: adding sodium hydroxide solution into the lithium preparation solution to adjust pH to 12.0, adding EDTA with a theoretical amount of 1.4 times for concentration reaction for 30min, adsorbing, filtering and purifying with powdered activated carbon, neutralizing, concentrating to obtain concentrated solution with lithium ion concentration of 11.3g/L, and controlling Ca in the solution 2+ 、Mg 2+ 、Fe 3+ 、Mn 2+ 、F-、Al 3+ The ion mass concentration is less than or equal to 0.07%, and the obtained concentrated solution can be used for preparing lithium sulfate products or preparing industrial grade lithium carbonate by precipitating lithium.The leaching rate of lithium is 80.2 percent.
Comparative example 3
The method for extracting lithium from the lithium porcelain stone raw material comprises the following steps:
s1, crushing: coarse crushing, medium crushing and fine crushing the lithium porcelain Dan Xianxian by a jaw crusher, sieving, grinding the undersize material by a ball mill, sieving by a high-frequency vibrating screen, removing weak magnetic iron minerals by a high-gradient magnetic separator with the magnetic field intensity of the magnetic pole surface of H=1500A/m, and grinding into fine powder to obtain crushed lithium porcelain stone;
s2, mixing: placing the broken lithium porcelain stone material, calcium sulfate and calcium carbonate in a mass ratio of 1.28:5.5:1.2 into a mixer to be fully and uniformly mixed to obtain a roasting raw material;
s3, roasting: the mixed roasting raw materials are subjected to rotary roasting in a roasting kiln, the temperature is controlled to be 900 ℃, the roasting time is 1.0h, mechanical crushing ball milling is carried out after roasting, and grinding powder is processed to 200 meshes, so that roasted fine powder is obtained;
s4, hot water acidification leaching: adding water into the roasting fine powder, fully stirring and mixing, wherein the mass ratio of the roasting fine powder to the water is 1:4, regulating the pH value to 6.0 by using 30% dilute sulfuric acid, performing leaching water washing treatment, wherein the temperature of the water is 70 ℃, and the leaching time is 0.8h, so that lithium in the roasting fine powder is fully released and enters into liquid, and a lithium sulfate salt solid-liquid mixture is obtained;
s5, solid-liquid separation and water washing: carrying out solid-liquid separation on the lithium sulfate solid-liquid mixture through a filtering device to obtain filter residues and filtrate, carrying out countercurrent washing on the filter residues for 5 times, combining the washing liquid and the filtrate to obtain a lithium preparation solution, wherein the filter residues can be used as raw materials of ceramics, the filtering device is a ceramic disc filter, and the content of lithium ions in the washed filter residues is detected to be 0.135wt%;
s6, preparing lithium or lithium salt: adding sodium hydroxide solution into the lithium preparation solution to adjust pH to 12.0, adding EDTA with a theoretical amount of 1.4 times for concentration reaction for 30min, adsorbing, filtering and purifying with powdered activated carbon, neutralizing, concentrating to obtain concentrated solution with lithium ion concentration of 11.4g/L, and controlling Ca in the solution 2+ 、Mg 2+ 、Fe 3+ 、Mn 2+ 、F-、Al 3+ The ion mass concentration is less than or equal to 0.07%, and the obtained concentrated solution can be used for preparing lithium sulfate products or preparing industrial grade lithium carbonate by precipitating lithium. The leaching rate of lithium is 83.2 percent.
Comparative example 4
The method for extracting lithium from the lithium porcelain stone raw material comprises the following steps:
s1, crushing: coarse crushing, medium crushing and fine crushing the lithium porcelain Dan Xianxian by a jaw crusher, sieving, grinding the undersize material by a ball mill, sieving by a high-frequency vibrating screen, removing weak magnetic iron minerals by a high-gradient magnetic separator with the magnetic field intensity of the magnetic pole surface of H=1500A/m, and grinding into fine powder to obtain crushed lithium porcelain stone;
s2, mixing: placing the broken lithium porcelain stone material, sodium sulfate, calcium sulfate and sulfuric acid in a mass ratio of 1.12:3.0:3.5:0.8 into a mixer, and fully and uniformly mixing to obtain a roasting raw material;
s3, roasting: the mixed roasting raw materials are subjected to rotary roasting in a roasting kiln, the temperature is controlled to 880 ℃, the roasting time is 1.2h, mechanical crushing ball milling is carried out after roasting, and grinding powder is processed to 160 meshes, so as to obtain roasted fine powder;
s4, leaching: adding water into the roasting fine powder, fully stirring and mixing, wherein the mass ratio of the roasting fine powder to the water is 1:4, carrying out leaching water washing treatment, wherein the temperature of the water is 40 ℃ and the leaching time is 1h, so that lithium in the roasting fine powder is fully released and enters the liquid, and obtaining a lithium sulfate salt solid-liquid mixture;
s5, solid-liquid separation and water washing: carrying out solid-liquid separation on the lithium sulfate solid-liquid mixture through a filtering device to obtain filter residues and filtrate, carrying out countercurrent washing on the filter residues for 5 times, combining the washing liquid and the filtrate to obtain a lithium preparation solution, wherein the filter residues can be used as raw materials of ceramics, the filtering device is a ceramic disc filter, and the content of lithium ions in the washed filter residues is detected to be 0.064wt%;
s6, preparing lithium or lithium salt: adding sodium hydroxide solution into the lithium preparation solution to adjust the pH to 12.5, adding EDTA with the theoretical amount of 1.4 times for concentration reaction for 30min, then carrying out adsorption filtration and purification treatment by using powdered activated carbon, and neutralizing,Concentrating to obtain concentrated solution, wherein the concentration content of lithium ions in the concentrated solution is 12.2g/L, and the obtained concentrated solution can be used for preparing lithium sulfate products or preparing industrial grade lithium carbonate by precipitating lithium. Control of Ca in the solution of this step 2+ 、Mg 2+ 、Fe 3+ 、Mn 2+ 、F-、Al 3+ And (3) filtering and separating the solid-liquid mixed solution when the ion mass concentration is less than or equal to 0.07%. The lithium leaching rate of the method is 89.4 percent through calculation.
Example 1
The method for extracting lithium from the lithium porcelain stone raw material comprises the following steps:
s1, crushing: coarse crushing, medium crushing and fine crushing the lithium porcelain Dan Xianxian by a jaw crusher, sieving, grinding the undersize material by a ball mill, sieving by a high-frequency vibrating screen, removing weak magnetic iron minerals by a high-gradient magnetic separator with the magnetic field intensity of the magnetic pole surface of H=1500A/m, and grinding into fine powder to obtain crushed lithium porcelain stone;
s2, mixing: placing the broken lithium porcelain stone material, sodium sulfate, calcium sulfate and calcium carbonate in a mass ratio of 1.28:3.0:3.6:0.6 in a mixer, and fully and uniformly mixing to obtain a roasting raw material;
s3, roasting: the mixed roasting raw materials are subjected to rotary roasting in a roasting kiln, the temperature is controlled to 880 ℃, the roasting time is 1.2h, mechanical crushing ball milling is carried out after roasting, and grinding powder is processed to 160 meshes, so as to obtain roasted fine powder;
s4, hot water acidification leaching: adding water into the roasting fine powder, fully stirring and mixing, adjusting the pH value of the roasting fine powder and the water to be 5.5 by using 30% dilute sulfuric acid according to the mass ratio of 1:4, performing leaching water washing treatment, wherein the temperature of the water is 65 ℃, and the leaching time is 1h, so that lithium in the roasting fine powder is fully released and enters the liquid to obtain a lithium sulfate salt solid-liquid mixture;
s5, solid-liquid separation and water washing: carrying out solid-liquid separation on the lithium sulfate solid-liquid mixture through a filtering device to obtain filter residues and filtrate, carrying out countercurrent washing on the filter residues for 5 times, combining the washing liquid and the filtrate to obtain a lithium preparation solution, wherein the filter residues can be used as raw materials of ceramics, the filtering device is a ceramic disc filter, and the content of lithium ions in the washed filter residues is detected to be 0.055wt%;
s6, preparing lithium or lithium salt: adding sodium hydroxide solution into the lithium preparation solution to adjust the pH value to 12.5, adding EDTA (ethylene diamine tetraacetic acid) with the theoretical amount of 1.4 times for concentration reaction for 30min, then carrying out adsorption, filtration and purification treatment by using powdered activated carbon, neutralizing and concentrating to obtain a concentrated solution, wherein the concentration content of lithium ions in the concentrated solution is 12.5g/L, and the obtained concentrated solution can be used for preparing lithium sulfate products or precipitating lithium to prepare industrial grade lithium carbonate. Control of Ca in the solution of this step 2+ 、Mg 2+ 、Fe 3+ 、Mn 2+ 、F-、Al 3+ And (3) filtering and separating the solid-liquid mixed solution when the ion mass concentration is less than or equal to 0.07%. The lithium leaching rate of the method is 99.7 percent through calculation.
The invention adopts the crushed lithium porcelain stone and the compound salt with specific proportion as roasting materials, and the lithium porcelain stone and the compound salt are subjected to working procedures such as roasting, grinding, acidification leaching, separation, washing and the like, and the production cost of lithium extraction can be reduced, the recovery rate and the leaching rate of lithium ore are improved through controlling the ingredients, the process chain optimization and the nodes in the roasting process, and the lithium ion concentration in the lithium slag is less than or equal to 0.09wt% and the leaching rate of lithium is as high as 99.5%. Meanwhile, the method has short process flow and is beneficial to realizing industrial production.
Claims (1)
1. A method for extracting lithium from lithium porcelain stone minerals by mixed sulfate roasting, which is characterized by comprising the following steps:
s1, crushing: coarse crushing, medium crushing and fine crushing are carried out on the lithium porcelain stone, sieving is carried out, the undersize is carried out after being ground by a ball mill, then sieving is carried out, a magnetic separator is used for removing weak magnetic iron minerals, and then fine grinding and powder treatment are carried out, thus obtaining broken lithium porcelain stone materials;
s2, mixing: placing the broken lithium porcelain stone material and the compound salt into a mixer to be fully and uniformly mixed to obtain a roasting raw material, wherein the compound salt is a mixture of sodium sulfate, calcium sulfate and calcium carbonate, and the mass ratio of the broken lithium porcelain stone material to the sodium sulfate, the calcium sulfate and the calcium carbonate is 1.28:3.0:3.6:0.6;
s3, roasting: the mixed roasting raw materials are subjected to rotary roasting in a roasting kiln, the temperature is controlled to be 880-900 ℃, the roasting time is 0.5-1.2 h, mechanical crushing ball milling is carried out after roasting, and grinding powder is processed to 160-200 meshes, so as to obtain roasting sand crushing fine powder;
s4, hot water acidification leaching: adding water into the calcined fine powder, fully stirring and mixing, adjusting the pH value to 5-6 by dilute sulfuric acid, performing leaching water washing treatment, wherein the temperature of water is 60-70 ℃ and the leaching time is 0.5-1 h, so as to obtain a lithium sulfate salt solid-liquid mixture;
s5, solid-liquid separation and water washing: carrying out solid-liquid separation on the lithium sulfate solid-liquid mixture through a filtering device to obtain filter residues and filtrate, carrying out countercurrent washing on the filter residues for 5 times by using water, and combining the washing liquid and the filtrate to obtain a lithium preparation solution;
s6, preparing lithium or lithium salt: evaporating and concentrating the lithium preparation solution to obtain refined lithium solution, adding sodium hydroxide and EDTA into the lithium preparation solution, performing adsorption and purification treatment by using activated carbon, neutralizing and concentrating to obtain concentrated solution, and preparing lithium sulfate product or precipitating lithium to prepare industrial grade lithium carbonate;
in the step S4, the mass ratio of the calcined fine powder to the water is 1:4;
in the step S5, after the filter residue is subjected to countercurrent washing for 5 times, the concentration of lithium ions in the filter residue is less than or equal to 0.09wt%;
in the step S6, the concentration content of lithium ions in the concentrated solution is 11-13 g/L;
in the step S6, ca in the concentrated solution 2+ 、Mg 2+ 、Fe 3+ 、Mn 2+ 、F - 、Al 3+ The ion mass concentration is less than or equal to 0.07wt%.
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| CN114774688A (en) * | 2022-06-20 | 2022-07-22 | 北京仿生界面科学未来技术研究院 | Method for extracting lithium |
| CN115725868A (en) * | 2022-11-23 | 2023-03-03 | 包头华美稀土高科有限公司 | Hot dipping tank, device and method for improving leaching rate of high-temperature roasting rare earth |
| CN115947352A (en) * | 2023-01-03 | 2023-04-11 | 河南鹏辉循环科技有限公司 | Method for extracting lithium from lepidolite by using fluidized bed |
| CN116409804B (en) * | 2023-02-23 | 2023-10-03 | 唐山鑫丰锂业有限公司 | Method for extracting lithium salt from low-grade lithium ore raw material |
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