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Recycling method of phosphorus in phosphorus containing waste

A waste and phosphorus-enriched technology, applied in chemical instruments and methods, phosphate, phosphorus compounds, etc., can solve problems such as waste, and achieve high recovery rate, considerable economic value, and high purity

Pending Publication Date: 2019-05-28
柯芬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the value of phosphorus in lithium iron phosphate is higher than that of lithium, because there is currently no low-cost recycling technology and it is wasted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The method for recycling phosphorus in the phosphorus-containing waste comprises the following steps:

[0018] A. React phosphorus-containing waste with alkaline substances (or alkaline solutions) to generate insoluble solids and soluble phosphates;

[0019] B, the reaction product obtained in step A is subjected to solid-liquid separation (or directly solid-liquid separation) after water leaching to obtain phosphorus-rich solution and solid slag;

[0020] C. The phosphorus-rich solution obtained in step B is crystallized or precipitated to obtain phosphate crystals or phosphate precipitates.

[0021] Phosphorus-containing waste reacts with alkaline substances as follows:

[0022] FePO 4 +3OH - =Fe(OH) 3 +PO 4 3-

[0023] In this embodiment, specifically, the alkaline substance or alkaline solution is sodium hydroxide or sodium hydroxide solution, potassium hydroxide or potassium hydroxide solution, lithium hydroxide or lithium hydroxide solution, sodium carbonat...

Embodiment 2

[0033] Get the phosphorus-containing waste material 100g described in embodiment 1, this waste material is mixed with sodium hydroxide solution, according to P / OH - =1:3 molar ratio, the reaction temperature is 90°C, and the reaction time is 10 minutes. After the reaction, the phosphate is dissolved with water. After testing, 96% of the phosphate in the lithium-containing waste is transferred to the solution, while the iron does not Dissolution. Remove the calcium and magnesium ions in it by feeding an appropriate amount of carbon dioxide, then add phosphoric acid to adjust the pH to 7-8, remove aluminum impurities, add sodium hydroxide to adjust the pH to about 12, and obtain trisodium phosphate dodecahydrate through concentrated crystallization , the purity can reach food grade.

[0034] the element

Embodiment 3

[0036] Get the phosphorus-containing waste material described in Example 1, mix the waste material with sodium hydroxide solution, and mix the waste material according to P / OH - =1:4 molar ratio, the reaction temperature is 60°C, and the reaction time is 30 minutes. After the reaction, the phosphate is dissolved with water. After testing, 99% of the phosphate in the lithium-containing waste is transferred to the solution, while the iron does not Dissolution. Remove the calcium and magnesium ions by adding a little sodium carbonate, then add phosphoric acid to adjust the pH to 7-8, remove aluminum impurities, add sodium hydroxide to adjust the pH to about 12, and get trisodium phosphate dodecahydrate through concentrated crystallization , the purity can reach food grade.

[0037] the element

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Abstract

The invention belongs to the technical field of lithium battery recycling, and relates to a recycling method of phosphorus in phosphorus containing waste. The invention solves the technical problems of low treatment efficiency and the like of the phosphorus containing waste in the prior art. The invention discloses the recycling method of the phosphorus containing waste which comprises the following steps of step 1, enabling the phosphorus containing waste to react with alkaline substance (or an alkaline solution) to produce an indissolvable solid and soluble phosphate; step 2, performing solid-liquid separation (or directly performing solid-liquid separation) on the reaction products obtained in step 1 after performing water-leaching on the reaction products to obtain a phosphorus-rich solution and solid slag; step 3, performing crystallization or precipitation on the phosphorus-rich solution obtained in step 2 to obtain phosphate crystal or phosphate precipitation. The process of theinvention is simple, the recycling rate is high, the cost is low, the diversification and high purity of the products are realized, and thereby considerable economic value of the recycling of the phosphorus containing waste is achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium battery recovery, and relates to a method for recycling phosphorus in phosphorus-containing waste materials. Background technique [0002] Since its birth, lithium-ion batteries have been widely used in mobile electronic products such as mobile phones, notebooks, and tablets because of their high energy density and fast charging and discharging characteristics. Especially with the rise of new energy vehicles, the development of lithium-ion batteries has been greatly advanced. The lifespan of lithium-ion batteries is generally about 4 years. With the large-scale use of lithium-ion batteries in the digital field and the field of new energy vehicles, a large number of used lithium-ion batteries will definitely be scrapped. Scrapped lithium-ion batteries contain organic substances, fluorides and heavy metals that are harmful to the environment and human body. If they are not properly treated, they wi...

Claims

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Application Information

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IPC IPC(8): C01B25/26C01B25/30C01B25/32C01B25/37
Inventor 柯芬
Owner 柯芬
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