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Method for recovering cadmium from waste nickel-cadmium battery

A waste battery, nickel-cadmium technology, applied in the field of waste battery recycling, can solve the problems of complex leaching equipment, long recycling process route, large equipment investment, etc., and achieves a simple and easy recycling method, less equipment investment, and high economic benefits. Effect

Active Publication Date: 2010-11-17
JIANGMEN CHANCSUN UMICORE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first patent is leaching under pressure, the leaching equipment is complex, and the equipment investment is large
The second patent is to recover cadmium by pyrometallurgy process. The entire recovery process route is very long and the investment in equipment is also large.

Method used

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  • Method for recovering cadmium from waste nickel-cadmium battery
  • Method for recovering cadmium from waste nickel-cadmium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Put 1000kg of powder into the dissolution kettle, add 5000L of water, 10000mol of sulfuric acid, 6000mol of oxidant sodium chlorate, heat up to 50°C, stir and soak for 3 hours, and take the leachate;

[0036] 2) Add waste nickel hydroxide, adjust the pH of the leaching solution to 3.5, remove iron, and separate solid and liquid;

[0037] 3) After the leachate after solid-liquid separation is passed into H 2 S gas to precipitate cadmium element.

[0038] After testing, the recovery rate of cadmium was 99.8%.

Embodiment 2

[0040] 1) Put 1000kg powder into the dissolution kettle, add 3000L water, 10000mol hydrochloric acid, 10000mol oxidant H 2 o 2 , heated up to 80°C, stirred and soaked for 1 hour, and took the leachate;

[0041] 2) adding sodium hydroxide solution, adjusting the pH of the leaching solution to 5, removing iron, and separating solid and liquid;

[0042] 3) Sodium sulfide is added to the leaching solution after solid-liquid separation to precipitate cadmium element.

[0043] After testing, the recovery rate of cadmium was 99.5%.

Embodiment 3

[0045] 1) Put 1000kg of powder into the dissolution kettle, add 4500L of water, 7500mol of sulfuric acid, and 8000mol of oxidant sodium persulfate, heat up to 60°C, stir and soak for 2 hours, and take the leachate;

[0046] 2) adding sodium carbonate, adjusting the pH of the leachate to 3, iron removal, solid-liquid separation;

[0047] 3) After the leachate after solid-liquid separation is passed into H 2 S gas to precipitate cadmium element.

[0048] After testing, the recovery rate of cadmium was 99.9%.

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Abstract

The invention discloses a method for method for recovering cadmium from a waste nickel-cadmium battery. The method comprises the following steps of: breaking the waste nickel-cadmium battery; performing magnetic separation and mesh screening; putting screened powder into a dissolving kettle; adding water, inorganic strong acid and an oxidizing agent into the dissolving kettle, and stirring the mixture; raising the temperature to be between 50 and 100 DEG C; soaking the mixture for 1 to 3 hours; taking leachate out of the dissolving kettle; adding an alkaline compound into the leachate; adjusting the pH value of the leachate to be between 3 and 5; removing irons; performing solid-liquid separation; passing H2S gas or adding a water-soluble sulphurizing salt into the leachate after the solid-liquid separation to deposit the cadmium element. The recovery method has the advantages of simplicity, easiness, lower energy consumption, high cadmium recovery rate, less equipment investment and high economic benefit, and is an environment-friendly and easily-operable process for recovering the cadmium from the waste nickel-cadmium battery. The recovered cadmium sulfide can be directly applied to the production of cadmium-added spherical nickel hydroxide.

Description

technical field [0001] The invention relates to a recycling method for waste batteries, in particular to a method for recycling cadmium from nickel-cadmium waste batteries. Background technique [0002] The positive electrode active material of nickel-cadmium battery is nickel hydroxide, and graphite or nickel powder is added to increase its conductivity. The negative electrode active material is spongy metal cadmium, and the electrolyte is potassium hydroxide or sodium hydroxide aqueous solution. The woven cloth is used as the isolation layer, and the shell is made of plastic or nickel-plated steel shell. Nickel-cadmium batteries contain a large amount of metal elements (Ni116-556g, Cd11-173g, K14-35g, etc. per kilogram of waste battery). [0003] The main harmful substance in waste nickel-cadmium batteries is cadmium, followed by nickel and cobalt. These harmful heavy metals mainly enter the environment through landfill or incineration together with municipal waste. High...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/06C22B17/00
CPCY02P10/20
Inventor 田吉平刘华力苏俊彦
Owner JIANGMEN CHANCSUN UMICORE IND
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