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Method for preparing battery-grade anhydrous iron phosphate from industrial ammonium phosphate clear liquid or industrial ammonium phosphate mother liquid

An industrial ammonium phosphate and anhydrous phosphoric acid technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of difficult control of process links, difficult to realize industrialization, complex process, etc., and achieve large-scale industrialization. The effect of easy control of production and reaction conditions and simple reaction conditions

Active Publication Date: 2021-07-13
湖北云翔聚能新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of the above method is relatively complicated, and air is used as the oxidant, the process link is difficult to control, and the cost is high, so it is difficult to realize industrialization

Method used

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  • Method for preparing battery-grade anhydrous iron phosphate from industrial ammonium phosphate clear liquid or industrial ammonium phosphate mother liquid
  • Method for preparing battery-grade anhydrous iron phosphate from industrial ammonium phosphate clear liquid or industrial ammonium phosphate mother liquid
  • Method for preparing battery-grade anhydrous iron phosphate from industrial ammonium phosphate clear liquid or industrial ammonium phosphate mother liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] S1. Fluoride removal: Add 1% diatomaceous earth and 1% sodium carbonate solution to the industrial ammonium phosphate clear solution to react for 5 hours, and then filter to obtain a phosphorus-containing solution after fluoride removal.

[0083] S2. Refining: adjust the pH value of the phosphorus-containing solution prepared in step S1 through ammonia gas, adjust the pH value to 6.8, remove impurities such as calcium, magnesium, manganese, aluminum through precipitation reaction, and obtain a phosphorus-containing solution with low impurity ion content .

[0084] S3. Removing heavy metals: adding an appropriate amount of sodium sulfide to the phosphorus-containing solution with low impurity ion content prepared in step S2 to remove heavy metal impurities and obtain a refined phosphate solution.

[0085] S4. Synthesis of ferric phosphate dihydrate: the refined phosphate solution obtained in step S3 is diluted with pure water, and the pH is adjusted to obtain the require...

Embodiment 2

[0088] S1. Defluorination: add 2% diatomaceous earth and 2.5% sodium carbonate solution to the industrial ammonium phosphate mother liquor to react for 3 hours, and then filter to obtain a phosphorus-containing solution after defluorination.

[0089] S2. Refining: adjust the pH value of the phosphorus-containing solution prepared in step S1 through ammonia gas, adjust the pH value to 7.05, remove impurities such as calcium, magnesium, manganese, aluminum, etc. by precipitation reaction, and obtain a phosphorus-containing solution with low impurity ion content .

[0090] S3. Removing heavy metals: adding an appropriate amount of sodium sulfide to the phosphorus-containing solution with low impurity ion content prepared in step S2 to remove heavy metal impurities and obtain a refined phosphate solution.

[0091] S4. Synthesis of ferric phosphate dihydrate: the refined phosphate solution obtained in step S3 is diluted with pure water, and the pH is adjusted to obtain the required...

Embodiment 3

[0094] S1. Fluorine removal: add 1.5% diatomite and 2.2% sodium carbonate solution to the industrial ammonium phosphate clear liquid to react for 2 hours, and then filter to obtain a phosphorus-containing solution after fluoride removal.

[0095] S2. Refining: adjust the pH value of the phosphorus-containing solution prepared in step S1 through ammonia gas, adjust the pH value to 7.10, remove impurities such as calcium, magnesium, manganese, and aluminum by precipitation reaction, and obtain a phosphorus-containing solution with low impurity ion content .

[0096] S3. Removing heavy metals: adding an appropriate amount of sodium sulfide to the phosphorus-containing solution with low impurity ion content prepared in step S2 to remove heavy metal impurities and obtain a refined phosphate solution.

[0097] S4. Synthesis of ferric phosphate dihydrate: the refined phosphate solution obtained in step S3 is diluted with pure water, and the pH is adjusted to obtain the required phosp...

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Abstract

The invention discloses a method for preparing battery-grade anhydrous iron phosphate from industrial ammonium phosphate clear liquid or industrial ammonium phosphate mother liquor. The method comprises the following steps: S1, fluorine removal: adding diatomite and sodium carbonate into the industrial ammonium phosphate clear liquid or the industrial ammonium phosphate mother liquor to remove fluorine; S2, refining: adjusting the pH value of the phosphorus-containing solution in the step S1, and removing impurities such as calcium, magnesium, manganese, aluminum and the like; S3, heavy metal removal: adding a heavy metal precipitant into the phosphorus-containing solution with low impurity ion content in the step S2 to remove heavy metal impurities; S4, synthesis of iron phosphate dihydrate: fully reacting the refined phosphate solution obtained in the step S3 with ferrous sulfate under the action of an oxidizing agent to prepare the iron phosphate dihydrate; and S5, preparation of battery-grade anhydrous iron phosphate: calcining the iron phosphate dihydrate prepared in the step S4 to prepare the battery-grade anhydrous iron phosphate. The method provided by the invention is simple in technological process and low in overall cost, and has relatively high industrial application value and economic value.

Description

technical field [0001] The invention belongs to the technical field of new energy battery material preparation, and in particular relates to a method for preparing battery-grade anhydrous iron phosphate by using industrial ammonium phosphate clear liquid or industrial ammonium phosphate mother liquor. Background technique [0002] Lithium iron phosphate cathode material with orthorhombic olivine structure is currently a hot material in the field of new energy batteries. This material combines the respective advantages of lithium cobaltate, lithium nickelate, lithium manganate and their derivative positive electrode materials: no precious elements, cheap raw materials, extremely rich resources; stable structure, excellent safety performance, LiFePO 4 The O and P in it are firmly combined with strong covalent bonds, which makes it difficult for the material to be decomposed by oxygen evolution; the high temperature performance and thermal stability are significantly better tha...

Claims

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Application Information

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IPC IPC(8): C01B25/37
CPCC01B25/375C01P2006/12C01P2006/11C01P2004/61
Inventor 陈迎迎肖益帆李学勇白金浩陈志炎
Owner 湖北云翔聚能新能源科技有限公司
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