Method and equipment for recovering cadmium and nickel from waste and old nickel-cadmium battery and preparing metal cadmium ingot and superfine nickel powder

A nickel-cadmium battery and metal cadmium technology, applied in the field of metal cadmium ingots and ultra-fine nickel powder, can solve the problems of high energy consumption, low added value of nickel-containing products, and high cadmium recovery rate

Inactive Publication Date: 2009-03-11
GUANGDONG BRUNP RECYCLING TECH +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fire treatment process is simple, the recovery rate of cadmium is high, and no waste water is pr

Method used

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  • Method and equipment for recovering cadmium and nickel from waste and old nickel-cadmium battery and preparing metal cadmium ingot and superfine nickel powder
  • Method and equipment for recovering cadmium and nickel from waste and old nickel-cadmium battery and preparing metal cadmium ingot and superfine nickel powder
  • Method and equipment for recovering cadmium and nickel from waste and old nickel-cadmium battery and preparing metal cadmium ingot and superfine nickel powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Use a professional dismantling machine to cut along the top of the AA nickel-cadmium battery without positive and negative active materials, so that the tabs are disconnected, and the tops of the positive and negative active materials are exposed. Take 179.2g of the battery and put it into a high-temperature furnace, keep nitrogen purging, and raise the temperature to 900°C for about 2 hours; keep the temperature of the low-temperature section at 150°C, and after the cadmium vapor is blown into this section by the nitrogen flow, it is rapidly cooled into liquid cadmium beads Into the curing mold, and finally condensed into cadmium block. Weigh after cooling: the weight of the cadmium block is 37.6g, and the weight of the nickel-iron slag is 89.5g. The cadmium content in the cadmium block detected by EDTA complexometric titration is 99.9%, and the cadmium content in the remaining ferronickel slag detected by atomic absorption spectrometer is 0.01%, and the calculated rec...

Embodiment 2

[0037] Get the ferronickel slag 50.0g among the embodiment 1 and put into the beaker, add the sulfuric acid 150ml and the 10ml hydrogen peroxide solution (H 2 o 2 content is 30%), put the beaker into a constant temperature water bath, adjust the temperature to 90°C, keep stirring with a magnetic stirrer, after 40min of reaction, filter to remove the filter residue, and set the filtrate to a constant volume of 500ml. EDTA complexometric titration, flame atomic absorption spectrometry and plasma emission spectrometry (ICP) are used to detect the metal element content in the leachate as follows:

[0038] element Fe Ni K co mn Zn Mg Cd Leaching solution (g / L) 46.3 39.4 5.92 2.21 0.76 0.45 0.24 0.02

[0039] After calculation, the leaching rate of nickel is 99.5%.

Embodiment 3

[0041] Get leaching solution 150ml in embodiment 2 and pour into beaker, add 15ml hydrogen peroxide solution (H 2 o 2 content is 30%), put the beaker in a constant temperature water bath, adjust the temperature to 90°C, keep the magnetic stirrer stirring, after reacting for 30min, add an appropriate amount of potassium hydroxide to adjust the pH value to 3.5, filter and remove the filter residue after standing, Dilute the filtrate to 250ml. Adopt EDTA complexometric titration, flame atomic absorption spectrometry and plasma emission spectrometry (ICP) to detect metal element content in the filtrate as follows:

[0042] element Ni K co mn Zn Mg Fe Cd Filtrate (g / L) 23.5 4.55 1.30 0.44 0.23 0.12 0.03 0.01

[0043] At this time, the iron removal rate was 99.86%, and the nickel loss rate was 0.32%.

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Abstract

The invention discloses a method and a device for recovering cadmium and nickel from waste nickel cadmium cells and preparing the cadmium and the nickel into metal cadmium ingots and superfine nickel powder. The method is mainly characterized in that: firstly, the waste nickel cadmium cells are simply disassembled; secondly, the waste nickel cadmium cells are placed into a sealed high-temperature furnace, are distilled, condensed and recovered to obtain the metal cadmium ingots; thirdly, residual materials are leached out by a sulfuric acid and hydrogen peroxide system; fourthly, after iron removal for a leaching solution, P507 is used for extracting and separating the nickel and cobalt; and fifthly, hydrazine hydrate is used for reducing nickel raffinate, and the superfine nickel powder is prepared. The method can make the cadmium recovery rate in the waste nickel cadmium cells be more than 99.5 percent, the purity of the metal cadmium ingots be more than 99.9 percent, the recovery rate of the nickel be more than 97.5 percent, and the purity of nickel powder be more than 99.8 percent.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal regeneration, and more specifically relates to a method and equipment for recovering cadmium and nickel from waste nickel-cadmium batteries and preparing them into metal cadmium ingots and superfine nickel powder. Background technique [0002] Nickel-cadmium batteries are widely used in mobile communications, household appliances, and locomotive starting due to their long cycle life, small self-discharge, large current discharge, wide operating temperature range, and reliable performance. Although the global nickel-cadmium batteries are gradually replaced by other high-performance secondary batteries, my country is a big country in the production and use of nickel-cadmium batteries. In the short term, there is still a large space for battery production and existence, and the output will still be maintained at a relatively high level. The service life of nickel-cadmium batteries is genera...

Claims

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Application Information

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IPC IPC(8): C22B17/02C22B23/00C22B3/26
CPCY02P10/20
Inventor 李长东黄国勇谭静进徐盛明
Owner GUANGDONG BRUNP RECYCLING TECH
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