Method for recycling waste lithium vanadium phosphate

A lithium vanadium phosphate, waste technology, used in chemical instruments and methods, vanadium compounds, lithium carbonate;/acid carbonate, etc., can solve the problems of complex production process, large consumption, strict parameters, etc. To achieve broad application prospects, reduce environmental pollution, and achieve the effect of reuse

Active Publication Date: 2018-11-09
湖南金凯循环科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent can finally recover vanadium pentoxide. In order to improve the purity, the production process is very complicated, the parameters to be controlled are relatively strict, and the cost is high. However, the control of production cost in the field of waste recycling is very important, so the above scheme is difficult to implement in practice application
[0004] Sodium orthovanadate is light white transparent needle-like or hexagonal prismatic crystal, easy to weather in the air, white after dehydration, can be used for desulfurization and decarburiza

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for reclaiming waste and old lithium vanadium phosphate, comprising the following steps:

[0020] Step 1. Oxidize 1 kg of waste lithium vanadium phosphate in an air-filled furnace at 300° C. for 3 hours, place the oxidized powder in a container, and add 3 L of water to the container to obtain the first slurry;

[0021] Step 2: Add 1.5 kg of calcium chloride dihydrate to the first slurry obtained in step 1, and filter after stirring for 1 hour to obtain a solution containing 600 ml of a lithium compound, a filter residue containing vanadium and calcium phosphate, and pass the flame atomic absorption spectrum The content of lithium in the solution of lithium-containing compound was tested by the method, and the result was 8.3g / L, so the mass of lithium in the solution of lithium-containing compound can be calculated to be 4.98g;

[0022] Step 3, in the filter residue containing vanadium and calcium phosphate obtained in step 2, add water to make the second slurry...

Embodiment 2

[0025] A method for reclaiming waste and old lithium vanadium phosphate, comprising the following steps:

[0026] Step 1. Oxidize 1 kg of waste lithium vanadium phosphate in an air-filled furnace at 600° C. for 0.5 h, place the oxidized powder in a container, and add 3 L of water to the container to obtain the first slurry;

[0027] Step 2: Add 1.5 kg of calcium chloride dihydrate to the first slurry obtained in step 1, and filter after stirring for 1 hour to obtain a solution containing 600 ml of a lithium compound, a filter residue containing vanadium and calcium phosphate, and pass the flame atomic absorption spectrum The content of lithium in the solution of lithium-containing compound was tested by the method, and the result was 8.3g / L, so the mass of lithium in the solution of lithium-containing compound can be calculated to be 4.98g;

[0028] Step 3, in the filter residue containing vanadium and calcium phosphate obtained in step 2, add water according to the solid-to-l...

Embodiment 3

[0031] A method for reclaiming waste and old lithium vanadium phosphate, comprising the following steps:

[0032] Step 1. Oxidize 1 kg of waste lithium vanadium phosphate in an air-filled furnace at 400° C. for 1 hour, place the oxidized powder in a container, and add 3 L of water to the container to obtain the first slurry;

[0033] Step 2: Add 1.5 kg of calcium chloride dihydrate to the first slurry obtained in step 1, and filter after stirring for 1 hour to obtain a solution containing 600 ml of a lithium compound, a filter residue containing vanadium and calcium phosphate, and pass the flame atomic absorption spectrum The content of lithium in the solution of lithium-containing compound was tested by the method, and the result was 8.4g / L, so the mass of lithium in the solution of lithium-containing compound can be calculated to be 5.04g;

[0034] Step 3, adding water to the filter residue containing vanadium and calcium phosphate obtained in step 2 according to a solid-to-...

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PUM

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Abstract

The invention discloses a method for recycling waste lithium vanadium phosphate. The method comprises the following steps: step one, oxidizing waste lithium vanadium phosphate in a furnace filled withair at 300-600 DEG C for 0.5-3h, and then adding water according to the solid-to-liquid ratio of 1:10-1:3, thus obtaining first slurry; step two, adding calcium salt into the first slurry obtained inthe step one, and then filtering to obtain a solution containing a lithium compound, and filter residues containing vanadium and calcium phosphate; step three, adding water into the filter residues containing vanadium and calcium phosphate according to the solid-to-liquid ratio of 1:7-1:2; and step four, adding sodium carbonate or sodium hydroxide into the second slurry obtained in the step three, enabling the pH value of the solution to be increased to 12.6-14.0, then filtering to obtain sodium orthovanadate solution and calcium phosphate filter residues, and concentrating and crystallizingthe sodium orthovanadate solution to obtain sodium orthovanadate crystals. The recycling method is relatively simple, lithium vanadium phosphate powder in the positive electrode material of a lithiumvanadium phosphate battery can be recycled to obtain the solution containing the lithium compound and the sodium orthovanadate crystals with relatively high purity, and the environment pollution caused by waste lithium vanadium phosphate powder can be prevented.

Description

technical field [0001] The invention relates to the field of recycling waste batteries, in particular to a method for recycling waste lithium vanadium phosphate. Background technique [0002] In the fields of communications and digital products, lithium-ion batteries are being used more and more widely due to their excellent performance, and their output continues to increase. Compared with lithium iron phosphate, lithium vanadium phosphate has become a new hope for power lithium-ion battery cathode materials because of its advantages of high specific capacity, high specific energy, good high-current discharge, especially low-temperature discharge performance. Although lithium vanadium phosphate batteries do not contain mercury, cadmium, lead and other highly toxic heavy metal elements compared with traditional batteries, their positive and negative electrode materials and electrolytes will endanger the environment and human health, and should be recycled. [0003] The Chin...

Claims

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Application Information

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IPC IPC(8): C01D15/08C01G31/00
CPCC01D15/08C01G31/00C01P2006/80
Inventor 颜群轩颜群湘肖绍辉
Owner 湖南金凯循环科技有限公司
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