Synthesis method and application of novel hydroxyl iron phosphate adsorbent

Abstract

The invention relates to a synthesis method and application of a novel hydroxyl iron phosphate adsorbent. The synthesis method comprises the following steps: heating, stirring and dissolving an iron source and a phosphorus source according to a certain proportion, and controlling the temperature to be 40-60 DEG C; adding nano activated carbon powder and a surfactant, and continuously stirring uniformly to obtain a mixed material; introducing air into the slurry, slowly introducing a precipitant, reacting for 3-5 hours to obtain slurry, and controlling the pH value at 4-6 at the end point of the reaction; introducing steam to raise the temperature of the slurry to 80-100 DEG C, and continuing aging reaction for 1-3 hours; and filtering and washing to obtain hydroxyl iron phosphate with an adsorption effect on lithium ions. The existence form of the iron hydroxyl phosphate adsorbent is Fe2PO4 (OH) 3, Fe3 (PO4) 2 (OH) 3, Fe4 (PO4) 3 (OH) 3 or Fe5 (PO4) 4 (OH) 3, the adsorption capacity of the Fe5 (PO4) 4 (OH) 3 is the best, the adsorption capacity of the Fe5 (PO4) 4 (OH) 3 to brine with the lithium content of 0.5 g / L can reach 29 mg / g or above at most, and the adsorption capacity of the Fe5 (PO4) 4 (OH) 3 to brine with the lithium content of 1.5 g / L can reach 56 mg / g or above at most.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical material preparation, and relates to a synthesis method and application of a novel iron hydroxyphosphate adsorbent. Background Art

[0002] At present, China has become one of the major manufacturing countries in the global lithium battery cathode material industry, and is also the largest producer and user of lithium iron phosphate and ternary cathode materials, and has become the world's largest exporter of lithium cobaltate and lithium manganate materials. At present, the main lithium salt raw materials for lithium ion cathode materials are lithium carbonate and lithium hydroxide. The extraction of lithium resources is mainly divided into two parts: one is the extraction of lithium from salt lakes and ores. Among them, the extraction of lithium from salt lakes mainly uses lithium ion adsorbents. Lithium ion adsorbents are divided into aluminum-based, manganese-based and titanium-based. Their advantages and disadvantages are as follows: the aluminum-based has a low adsorption capacity but only pure water is needed for desorption; the manganese-based has a high adsorption capacity but acid is used for desorption and there is dissolution loss, which affects the cycle life; the titanium-based has a long cycle life but high synthesis requirements and a complex adsorption and desorption process.

[0003] The novel lithium ion adsorbent iron hydroxyphosphate obtained by the present invention has low preparation cost and high adsorption capacity. Summary of the Invention

[0004] The purpose of the present invention is to provide a synthesis method and application of a novel iron hydroxyphosphate adsorbent. The present invention uses phosphorus and iron as the main elements, and through oxidative precipitation synthesis, iron hydroxyphosphate with an adsorption effect on lithium ions is obtained.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A synthesis method of a novel iron hydroxyphosphate adsorbent, the synthesis method of the novel iron hydroxyphosphate adsorbent includes the following steps:

[0007] (1) Weigh the iron source and phosphorus source according to a certain ratio, add 98% sulfuric acid or water, heat and stir to dissolve at 40 - 60 °C, and filter to obtain solution A;

[0008] (2) Add nano-activated carbon powder and surfactant to solution A, and stir for 25 - 35 min to form slurry B;

[0009] (3) Heat slurry B to 50 - 70 °C and introduce air, while dropping the precipitant, stir while dropping the precipitant, control the dropping time of the precipitant for 3 - 5 h, control the end point pH to 4 - 6, and obtain the mixed slurry C;

[0010] (4) Continue to introduce steam into the mixed slurry C to raise the temperature to 80 - 100 °C, keep warm and age for 1 - 3 h, vacuum filter, wash with clear water until the pH is neutral, and dry at 120 - 150 °C for 3 - 5 h to obtain the iron hydroxyphosphate adsorbent.

[0011] The total weight of the aforementioned iron source and phosphorus source is controlled at 287.5 - 875.7 g, and the mass ratio of the aforementioned iron source to the phosphorus source is 2 - 3:1.

[0012] The aforementioned iron source is one or more of ferrophosphorus slag, waste iron phosphate, ferrous sulfate, iron powder, iron red, magnetite, and iron phosphate.

[0013] The aforementioned phosphorus source is one or more of sodium dihydrogen phosphate, waste iron phosphate, ferrophosphorus slag, phosphoric acid, monoammonium phosphate, diammonium phosphate, sodium phosphate monobasic, sodium phosphate dibasic, and sodium phosphate tribasic.

[0014] The iron concentration of the aforementioned solution A is controlled at 1.5 - 2 mol / L.

[0015] The addition amount of the aforementioned nano-activated carbon powder is 7 - 13 g, and the addition amount of the aforementioned surfactant is 4 - 7 g.

[0016] The aforementioned surfactant is citric acid or oxalic acid.

[0017] The aforementioned slurry B is heated to 60°C and air is introduced. The air introduction rate is 250 - 500 mL / min, the oxygen content of the air is > 20%, and the aforementioned precipitant is 1 mol / L sodium hydroxide solution.

[0018] The existence form of the aforementioned iron hydroxyphosphate adsorbent is Fe2PO4(OH)3, Fe3(PO4)2(OH)3, Fe4(PO4)3(OH)3, or Fe5(PO4)4(OH)3. The preferred existence form of the aforementioned iron hydroxyphosphate adsorbent is Fe5(PO4)4(OH)3.

[0019] An application of the aforementioned novel iron hydroxyphosphate adsorbent in adsorbing lithium ions.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The novel iron hydroxyphosphate adsorbent of the present invention has a high adsorption capacity for lithium ions. The existence form of the iron hydroxyphosphate adsorbent is Fe2PO4(OH)3, Fe3(PO4)2(OH)3, Fe4(PO4)3(OH)3, or Fe5(PO4)4(OH)3. The adsorption ability of Fe5(PO4)4(OH)3 is the best. For brine with a lithium content of 0.5 g / L, the adsorption ability can reach up to more than 29 mg / g at most, and for brine with a lithium content of 1.5 g / L, the adsorption ability can reach up to more than 56 mg / g at most.

[0022] 2. Using ferrophosphorus slag or waste phosphoric acid iron as both iron source and phosphorus source simultaneously saves production costs and realizes resource recycling. For the new hydroxyapatite iron adsorbent synthesized using ferrophosphorus slag, for brine with a lithium content of 0.5 g / L, the adsorption capacity can reach 29.1 mg / g, and for brine with a lithium content of 1.5 g / L, the adsorption capacity can reach 57.8 mg / g; for the new hydroxyapatite iron adsorbent synthesized using ferrophosphorus slag, for brine with a lithium content of 0.5 g / L, the adsorption capacity can reach 35.5 mg / g, and for brine with a lithium content of 1.5 g / L, the adsorption capacity can reach 59.7 mg / g.

[0023] 3. The process technology of the present invention is simple, with low production costs and easy to scale up. The preparation flow chart is shown in Figure 1 . Brief Description of the Drawings

[0024] Figure 1 is the process flow chart;

[0025] Figure 2 is the XRD pattern of the adsorbent sample prepared in Example 2 of the invention. Detailed Description of the Invention

[0026] The present invention will be described in detail below in conjunction with the drawings and specific embodiments. The present invention will be further described below in conjunction with the embodiments. The embodiments are only further supplements and descriptions of the present invention, rather than limitations of the invention.

[0027] Example 1

[0028] Weigh 280 g of ferrophosphorus slag (iron content 20%, phosphorus content 12.5%), 280 g of ferrous sulfate (iron content 20%), add 98% sulfuric acid and heat with stirring to dissolve, filter to obtain a solution, control the iron concentration at 2 mol / L, and the temperature at 45 °C; continue to add 9 g of nano-activated carbon powder and 5 g of citric acid, stir for 30 min to form a slurry; heat the slurry to 60 °C, introduce air at a rate of 300 mL / min, and simultaneously drip 1 mol / L sodium hydroxide solution, control the end point pH to 4.5, and control the total dripping time to be more than 3 h; heat the obtained mixed slurry to 95 °C by introducing steam, keep it warm and aged for 2 h, filter under vacuum, wash with clear water until the pH is neutral, and dry at 120 - 150 °C for 4 h to obtain 280 g of hydroxyapatite iron adsorbent (Fe 2 PO 4 (OH) 3 ).

[0029] Prepare 1 L of brine with a lithium concentration of 0.5 g / L and 1 L of brine with a lithium concentration of 1.5 g / L, both with a pH of 11, and respectively add hydroxyapatite iron adsorbent (Fe 2 PO 4(OH1L lithium concentration of 1.5 g / L brine, pH is 11 for both. Respectively add 20 g and 45 g of hydroxyapatite adsorbent (Fe 2 PO 4 (OH) 3 ) and stir and adsorb at 70 °C for 1 h. After filtration, the lithium concentrations of the filtrates are measured to be 0.17 g / L and 0.15 g / L respectively. Calculate the adsorption capacities for the two lithium concentrations to be 16.5 mg / g and 30 mg / g respectively.

[0030] Example 2

[0031] Weigh 420 g of phosphorus iron slag (iron content 20%, phosphorus content 12.5%), 420 g of ferrous sulfate (iron content 20%), and 35.7 g of sodium dihydrogen phosphate (phosphorus content 25.2%). Add 98% sulfuric acid and heat with stirring to dissolve. After filtration, a solution is obtained. Control the iron concentration to be 1.5 mol / L and the temperature to be 45 °C; continue to add 13 g of nano-activated carbon powder and 7 g of citric acid, and stir for 35 min to form a slurry; heat the slurry to 60 °C, introduce air at a rate of 300 mL / min, and at the same time dropwise add 1 mol / L sodium hydroxide solution, control the end point pH to be 4.5, and control the total dropping time to be more than 3 h; continue to introduce steam into the obtained mixed slurry to raise the temperature to 95 °C, keep it warm and aged for 2 h, filter under vacuum, wash with clear water until the pH is neutral, and dry at 120 - 150 °C for 4 h to obtain 432 g of hydroxyapatite adsorbent (Fe 3 (PO 4 ) 2 (OH) 3 )

[0032] Prepare 1 L of brine with a lithium concentration of 0.5 g / L and 1 L of brine with a lithium concentration of 1.5 g / L, pH is 11 for both. Respectively add 15 g and 30 g of hydroxyapatite adsorbent (Fe 2 PO 4 (OH1L lithium concentration of 1.5 g / L brine, pH is 11 for both. Respectively add 15 g and 30 g of hydroxyapatite adsorbent (Fe 3 (PO 4 ) 2 (OH) 3 ) and stir and adsorb at 80 °C for 1 h. After filtration, the lithium concentrations of the filtrates are measured to be 0.12 g / L and 0.14 g / L respectively. Calculate the adsorption capacities for the two lithium concentrations to be 25.3 mg / g and 45.3 mg / g respectively.

[0033] Example 3

[0034] Weigh 280 g of ferrophosphorus slag (iron content 20%, phosphorus content 12.5%), 120 g of ferrous sulfate (iron content 20%), add 98% sulfuric acid, heat and stir to dissolve, filter to obtain a solution, control the iron concentration at 1.5 mol / L, and the temperature at 50 °C; continue to add 7 g of nano-activated carbon powder and 4 g of citric acid, stir for 30 min to form a slurry; heat the slurry to 60 °C, introduce air at a rate of 250 mL / min, and simultaneously drip 1 mol / L sodium hydroxide solution, control the end point pH to 5, and control the total dripping time to more than 3 h; continue to introduce steam into the obtained mixed slurry to heat it to 95 °C, keep it warm and aged for 2 h, vacuum filter, wash with clear water until the pH is neutral, and dry at 120 - 150 °C for 4 h to obtain iron hydroxyphosphate adsorbent (Fe 5 (PO 4 ) 4 (OH) 3 ) 181 g.

[0035] Prepare 1 L of brine with a lithium concentration of 0.5 g / L and 1 L of brine with a lithium concentration of 1.5 g / L, both with a pH of 11. Respectively add 11 g and 23 g of iron hydroxyphosphate adsorbent (Fe 2 PO 4 (OH) 1 L of brine with a lithium concentration of 1.5 g / L, both with a pH of 11. Respectively add 11 g and 23 g of iron hydroxyphosphate adsorbent (Fe 5 (PO 4 ) 4 (OH) 3 ) Stir and adsorb at 70 °C for 1 h, filter and test the lithium concentration in the filtrate to be 0.18 g / L and 0.17 g / L respectively, and calculate the adsorption capacities for the two lithium concentrations to be 29.1 mg / g and 57.8 mg / g respectively.

[0036] Example 4

[0037] Weigh 155 g of waste ferric phosphate (iron content 36.3%, phosphorus content 20.7%), 280 g of ferrous sulfate (iron content 20%), add 98% sulfuric acid, heat and stir to dissolve, filter to obtain a solution, control the iron concentration at 1.5 mol / L, and the temperature at 50 °C; continue to add 9 g of nano-activated carbon powder and 5 g of citric acid, stir for 25 min to form a slurry; heat the slurry to 60 °C, introduce air at a rate of 300 mL / min, and simultaneously drip 1 mol / L sodium hydroxide solution, control the end point pH to 4.5, and control the total dripping time to more than 3 h; continue to introduce steam into the obtained mixed slurry to heat it to 95 °C, keep it warm and aged for 2 h, vacuum filter, wash with clear water until the pH is neutral, and dry at 120 - 150 °C for 5 h to obtain iron hydroxyphosphate adsorbent (Fe 2 PO 4 (OH) 3 ) 282 g.

[0038] Prepare 1 L of brine with a lithium concentration of 0.5 g / L and 1 L of brine with a lithium concentration of 1.5 g / L, both with a pH of 11. Respectively add 20 g and 45 g of hydroxyapatite adsorbent (Fe 2 PO 4 (OH) 3 ) and stir and adsorb at 70 °C for 1 h. Filter and test the lithium concentration in the filtrate to be 0.14 g / L and 0.16 g / L respectively. Calculate the adsorption capacities for the two lithium concentrations to be 18 mg / g and 29.7 mg / g respectively.

[0039] Example 5

[0040] Weigh 231 g of waste iron phosphate (iron content 36.3%, phosphorus content 20.7%), 420 g of ferrous sulfate (iron content 20%), and 59.5 g of sodium dihydrogen phosphate (phosphorus content 25.2%). Add 98% sulfuric acid and heat with stirring to dissolve. Filter to obtain a solution, control the iron concentration to be 1.5 mol / L, and the temperature to be 45 °C; continue to add 13 g of nano-activated carbon powder and 7 g of citric acid, and stir for 35 min to form a slurry; heat the slurry to 60 °C, pass air at 300 mL / min, and at the same time dropwise add 1 mol / L sodium hydroxide solution, control the end point pH to be 4.5, and control the total dropping time to be more than 3 h; heat the obtained mixed slurry to 95 °C by passing steam, keep it warm and aged for 2 h, filter under vacuum, wash with clear water until the pH is neutral, and dry at 120 - 150 °C for 3 h to obtain 429 g of hydroxyapatite adsorbent (Fe 3 (PO 4 ) 2 (OH) 3 )

[0041] Prepare 1 L of brine with a lithium concentration of 0.5 g / L and 1 L of brine with a lithium concentration of 1.5 g / L, both with a pH of 11. Respectively add 15 g and 30 g of hydroxyapatite adsorbent (Fe 2 PO 4 (OH) 1 L of brine with a lithium concentration of 1.5 g / L, both with a pH of 11. Respectively add 15 g and 30 g of hydroxyapatite adsorbent (Fe 3 (PO 4 ) 2 (OH) 3 ) and stir and adsorb at 80 °C for 1 h. Filter and test the lithium concentration in the filtrate to be 0.18 g / L and 0.21 g / L respectively. Calculate the adsorption capacities for the two lithium concentrations to be 22 mg / g and 43 mg / g respectively.

[0042] Example 6

[0043] Weigh 155 g of waste iron phosphate (iron content 36.3%, phosphorus content 20.7%), 120 g of ferrous sulfate (iron content 20%), and 12.5 g of sodium dihydrogen phosphate (phosphorus content 25.2%). Add 98% sulfuric acid and heat with stirring to dissolve. Filter to obtain a solution, control the iron concentration at 1.5 mol / L, and the temperature at 50 °C. Then continue to add 7 g of nano-activated carbon powder and 4 g of citric acid, and stir for 30 min to form a slurry. Heat the slurry to 60 °C, introduce air at a rate of 250 mL / min, and simultaneously dropwise add 1 mol / L sodium hydroxide solution. Control the final pH to 5, and the total dropping time to more than 3 h. Heat the obtained mixed slurry to 95 °C by introducing steam, keep it warm and aged for 2 h, then filter under vacuum, wash with clear water until the pH is neutral, and dry at 120 - 150 °C for 4 h to obtain the iron hydroxyphosphate adsorbent (Fe 5 (PO 4 ) 4 (OH) 3 ) 181 g.

[0044] Prepare 1 L of brine with a lithium concentration of 0.5 g / L and 1 L of brine with a lithium concentration of 1.5 g / L, both with a pH of 11. Respectively add 11 g and 23 g of the iron hydroxyphosphate adsorbent (Fe 2 PO 4 (OH). Stir and adsorb at 70 °C for 1 h. After filtration, test the lithium concentration in the filtrate to be 0.11 g / L and 0.13 g / L respectively. Calculate the adsorption capacities for the two lithium concentrations to be 35.5 mg / g and 59.7 mg / g respectively. 5 (PO 4 ) 4 (OH) 3 ) 11 g and 23 g, stir and adsorb at 70 °C for 1 h, filter and test the lithium concentration in the filtrate to be 0.11 g / L and 0.13 g / L respectively, and calculate the adsorption capacities for the two lithium concentrations to be 35.5 mg / g and 59.7 mg / g respectively.

[0045] Example 7

[0046] Weigh 560 g of ferrous sulfate (iron content 20%) and 132 g of sodium dihydrogen phosphate (phosphorus content 25.2%), heat and stir to dissolve into a solution, control the iron concentration at 2 mol / L, and the temperature at 45 °C. Then continue to add 9 g of nano-activated carbon powder and 5 g of oxalic acid, and stir for 35 min to form a slurry. Heat the slurry to 60 °C, introduce air at a rate of 500 mL / min, and simultaneously dropwise add 1 mol / L sodium hydroxide solution. Control the final pH to 4.5, and the total dropping time to more than 4 h. Heat the obtained mixed slurry to 95 °C by introducing steam, keep it warm and aged for 2 h, then filter under vacuum, wash with clear water until the pH is neutral, and dry at 120 - 150 °C for 4 h to obtain the iron hydroxyphosphate adsorbent (Fe 2 PO 4 (OH) 3 ) 285 g.

[0047] Prepare 1 L of brine with a lithium concentration of 0.5 g / L and 1 L of brine with a lithium concentration of 1.5 g / L, both with a pH of 11. Respectively add the iron hydroxyphosphate adsorbent (Fe 2 PO 4 (OH). For 1 L of brine with a lithium concentration of 1.5 g / L and a pH of 10, respectively add 20 g and 45 g of the iron hydroxyphosphate adsorbent (Fe 2 PO 4 (OH) 3 ). Stir and adsorb at 70 °C for 1 h, filter and test the lithium concentration in the filtrate to be 0.15 g / L and 0.18 g / L respectively, and calculate the adsorption capacities for the two lithium concentrations to be 17.5 mg / g and 29.3 mg / g respectively.

[0048] Example 8

[0049] Weigh 560 g of ferrous sulfate (iron content 20%) and 211 g of sodium dihydrogen phosphate (phosphorus content 25.2%), heat and stir to dissolve into a solution, control the iron concentration at 1.5 mol / L and the temperature at 50 °C; continue to add 12 g of nano-activated carbon powder and 7 g of oxalic acid, and stir for 30 min to form a slurry; heat the slurry to 60 °C, introduce air at a rate of 500 mL / min, and at the same time drip 1 mol / L sodium hydroxide solution, control the end point pH to be 5, and control the total dripping time to be more than 3 h; continue to introduce steam to heat the obtained mixed slurry to 95 °C, keep it warm and age for 3 h, filter under vacuum, wash with clear water until the pH is neutral, and dry at 120 - 150 °C for 5 h to obtain 292 g of the iron hydroxyphosphate adsorbent (Fe 5 (PO 4 ) 4 (OH) 3 ).

[0050] Prepare 1 L of brine with a lithium concentration of 0.5 g / L and 1 L of brine with a lithium concentration of 1.5 g / L, both with a pH of 11. Respectively add the iron hydroxyphosphate adsorbent (Fe 2 PO 4 (OH). For 1 L of brine with a lithium concentration of 1.5 g / L and a pH of 11, respectively add 11 g and 23 g of the iron hydroxyphosphate adsorbent (Fe 5 (PO 4 ) 4 (OH) 3 ). Stir and adsorb at 70 °C for 1 h, filter and test the lithium concentration in the filtrate to be 0.16 g / L and 0.2 g / L respectively, and calculate the adsorption capacities for the two lithium concentrations to be 31 mg / g and 56.5 mg / g respectively.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for synthesizing a novel hydroxyferric phosphate adsorbent, characterized in that: The synthesis method of the novel hydroxyferric phosphate adsorbent comprises the following steps: (1) Weigh an iron source and a phosphorus source in a certain proportion, add 98% sulfuric acid or water, heat at 40-60° C., stir and dissolve, and filter to obtain solution A; (2) Add nano activated carbon powder and surfactant to solution A and stir for 25-35 minutes to form slurry B; (3) Slurry B is heated to 50-70° C. and air is introduced, while a precipitant is added dropwise. The precipitant is added dropwise while stirring. The time for adding the precipitant is controlled to be 3-5 hours, and the end point pH is controlled to be 4-6, to obtain a mixed slurry C; (4) Steam is continuously introduced into the mixed slurry C to raise the temperature to 80-100° C., and the mixture is kept for aging for 1-3 hours. The mixture is vacuum filtered, washed with clean water until the pH value is neutral, and dried at 120-150° C. for 3-5 hours to obtain a hydroxyferric phosphate adsorbent.

2. The method for synthesizing the novel hydroxyferric phosphate adsorbent according to claim 1, characterized in that: In step (1), the total weight of the iron source and the phosphorus source is controlled at 287.5-875.7 g, and the mass ratio of the iron source to the phosphorus source is 2-3:

1.

3. The method for synthesizing the novel ferric hydroxyphosphate adsorbent as claimed in claim 1 or 2, characterized in that: In step (1), the iron source is one or more of ferrophosphorus slag, waste ferric phosphate, ferrous sulfate, iron powder, red iron, ferroferric oxide, and ferric phosphate.

4. The method for synthesizing the novel ferric hydroxyphosphate adsorbent as claimed in claim 1 or 2, characterized in that: In step (1), the phosphorus source is one or more of sodium dihydrogen phosphate, waste iron phosphate, ferrophosphorus slag, phosphoric acid, monoammonium phosphate, diammonium phosphate, monosodium phosphate, disodium phosphate, and trisodium phosphate.

5. The method for synthesizing the novel hydroxyferric phosphate adsorbent according to claim 1, characterized in that: In step (1), the iron concentration of the solution A is controlled at 1.5-2 mol / L.

6. The method for synthesizing the novel hydroxyferric phosphate adsorbent according to claim 1, characterized in that: In step (2), the amount of the nano activated carbon powder added is 7-13 g, and the amount of the surfactant added is 4-7 g.

7. The method for synthesizing the novel ferric hydroxyphosphate adsorbent as claimed in claim 1 or 6, characterized in that: In step (2), the surfactant is citric acid or oxalic acid.

8. The method for synthesizing the novel hydroxyferric phosphate adsorbent according to claim 1, characterized in that: In step (3), the slurry B is heated to 60° C. and air is introduced into the slurry. The air introduction rate is 250-500 mL / min. The oxygen content of the air is greater than 20%. The precipitant is 1 mol / L sodium hydroxide solution.

9. The method for synthesizing the novel hydroxyferric phosphate adsorbent according to claim 1, characterized in that: In step (4), the hydroxyferric phosphate adsorbent exists in the form of Fe2PO4(OH)3, Fe3(PO4)2(OH)3, Fe4(PO4)3(OH)3 or Fe5(PO4)4(OH)3, and the hydroxyferric phosphate adsorbent preferably exists in the form of Fe5(PO4)4(OH)3.

10. Use of the novel hydroxyferric phosphate adsorbent according to claims 1-9 in adsorbing lithium ions.

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