Method for recycling and preparing superfine nickel powder from nickel-hydrogen cell

A nickel-metal hydride battery and metal nickel powder technology, applied in the field of hydrometallurgy and powder metallurgy, can solve the problems of high energy consumption and high cost

Active Publication Date: 2009-03-11
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, nickel powder is mainly produced by evaporation-condensation method, carbonyl nickel pyrolysis method, spray-pyrolysis method, electrolysis method and other methods, which are usually made of metal nickel and nickel sulfate as raw materials, which have high cost and high energy consumption.

Method used

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  • Method for recycling and preparing superfine nickel powder from nickel-hydrogen cell
  • Method for recycling and preparing superfine nickel powder from nickel-hydrogen cell
  • Method for recycling and preparing superfine nickel powder from nickel-hydrogen cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Leaching stage: Prepare 3.2mol / L sulfuric acid solution, measure 150ml and pour it into a 500ml beaker, put the beaker into a constant temperature water bath, and adjust the temperature to 85°C; weigh 40g of powdery nickel metal hydride battery positive electrode waste, pour it into In the sulfuric acid solution, keep stirring with a magnetic stirrer, and after reacting for 60 minutes, filter to remove the filter residue, and make the filtrate to a constant volume of 250ml. The specific content of each element in the leachate is measured by diacetyl oxime spectrophotometry and flame atomic absorption spectrometer as follows:

[0036] element Ni co Na Mg CD Cu Fe Ca Zn mn Leaching solution (g / L) 77.1 6.02 1.00 2.08 3.86 1.04 0.83 0.40 0.87 0.19

[0037] The leaching rate of nickel is calculated to be about 75.1%.

Embodiment 2

[0039] Leaching stage: prepare 3.2mol / L sulfuric acid solution, measure 150ml and pour it into a 500ml beaker, measure 11.7ml hydrogen peroxide solution (containing H 2 o 2 30%) into the same beaker, put the beaker into a constant temperature water bath, and adjust the temperature to 85°C; weigh 40g of powdered Ni-MH battery positive electrode waste, pour it into the mixed solution, keep stirring with a magnetic stirrer, and react for 60 minutes , filtered to remove the filter residue, and the filtrate was constant volume 250ml. The specific content of each element in the leachate is measured by diacetyl oxime spectrophotometry and flame atomic absorption spectrometer as follows:

[0040] element Ni co Mg Na CD Cu Fe Ca Zn mn Leaching solution (g / L) 102.1 6.62 2.18 1.01 5.02 1.22 0.93 0.48 0.91 0.21

[0041] The leaching rate of nickel is calculated to be about 99.6%.

Embodiment 3

[0043] P204 impurity removal stage: adjust the pH value of the sulfuric acid leaching solution to about 3.0 with NaOH, and then use P204 to extract and remove impurities after oxidation. , the organic phase was first saponified with NaOH, the saponification rate was 75%, and the secondary countercurrent extraction was carried out, and the extraction equilibrium pH value was 3.5. After the extraction, the aqueous phase solution, the specific content of each element measured by dimethylglyoxime spectrophotometry, flame atomic absorption spectrometer and plasma emission spectrometry (ICP) is as follows:

[0044] element Ni co Na Mg CD Cu Fe Ca Zn mn After P204 decontamination

[0045] It can be seen from the above table that Cd, Cu, Fe, Ca, Zn, Mn, etc. basically all enter the organic phase, but some nickel and cobalt also enter the organic phase, and the loss of nickel is about 4.4%.

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Abstract

The invention discloses a method for directly reclaiming and preparing superfine nickel powder in positive material of nickel-hydrogen batteries. The method is characterized in that firstly, a professional disassembling machine is adopted to disassemble waste nickel-hydrogen batteries to obtain positive waste material which is crushed; secondly, lixiviating is performed by adopting a sulphuric acid and oxyful system; iron is removed and then impurities are extracted using P204 from lixivium to cause impurities such as calcium, copper, manganese, zincum and the like to transfer to an organic phase and cause nickel and cobalt to be left in a water phase; thirdly, solution containing nickel and cobalt is separated and extracted by using P507 so cause the cobalt to transfer to the organic phase the nickel to be left in the water phase; at last, faffinate containing nickel is deoxidized using hydrazine hydrate to obtain the superfine nickel powder. Through the application of the method, the coefficient of recovery of nickel in the positive waste material can reach more than 98.5 percent, and the purity of the obtained nickel reaches more than 99.7 percent; and the superfine nickel powder with the average grain diameter of 400 nm and face centered cubic crystal type sphericity is obtained by applying the method.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and powder metallurgy, and more specifically relates to a method for directly recovering and preparing superfine metal nickel powder from nickel-hydrogen battery positive electrode waste. Background technique [0002] my country is the world's largest battery producer. According to the statistics of China Power Supply Industry Association, China's output of rechargeable batteries in 2005 was 3.7 billion, of which the output of nickel-metal hydride batteries was about 1 billion. The service life of nickel-metal hydride batteries is about 2-3 years, and the first batch of nickel-hydrogen batteries put into the market have exceeded their service life and entered the phase-out period. According to battery industry statistics and forecasts, from 1998 to 2005, the national waste The total number of batteries is about 1.5 billion, reaching 470 million in 2005 alone, and will increase year by year...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54B22F9/00B22F9/16C22B23/00
CPCY02W30/84
Inventor 李长东黄国勇徐盛明
Owner GUANGDONG BRUNP RECYCLING TECH
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