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Method for measuring cadmium content in waste nickel-cadmium battery

A technology of nickel-cadmium battery and determination method, which is applied in the preparation of test samples, measurement of color/spectral characteristics, material analysis through observation of the influence of chemical indicators, etc., can solve difficulties, interference of accurate determination of cadmium, has not been found and other problems to achieve high precision, accurate results, and small errors

Active Publication Date: 2012-07-18
GUANGDONG BRUNP RECYCLING TECH +1
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Problems solved by technology

Waste nickel-cadmium batteries are high-risk wastes, and there is no relevant report on the determination method of cadmium content. This obviously hinders the recycling of waste nickel-cadmium batteries, and is not conducive to the standardization and healthy development of waste nickel-cadmium battery recycling industry.
[0004] The determination of cadmium generally adopts atomic absorption spectrometry and EDTA indirect determination method. Method and report for the determination of cadmium in waste nickel-cadmium batteries, and waste nickel-cadmium batteries contain a large amount of nickel and a small amount of cobalt, as well as perforated metal iron sheets and iron metal shells as conductive substrates, the high impurity background in the battery is accurate for cadmium Determination brings great interference and difficulty

Method used

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  • Method for measuring cadmium content in waste nickel-cadmium battery
  • Method for measuring cadmium content in waste nickel-cadmium battery
  • Method for measuring cadmium content in waste nickel-cadmium battery

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Embodiment Construction

[0022] The present invention will be described in detail below by way of examples.

[0023] 1. Main reagents and instruments:

[0024] 1.1. Hydrochloric acid (ρ=1.19g / ml)

[0025] 1.2. Hydrochloric acid (50% concentration)

[0026] 1.3. Nitric acid (ρ=1.42g / ml)

[0027] 1.4. Aqua regia (hydrochloric acid: nitric acid = 3:1)

[0028] 1.5. Ammonia water (ρ=0.90g / ml)

[0029] 1.6. Ammonia water (50% concentration)

[0030] 1.7. Ammonium acetate solution (500g / L)

[0031] 1.8. Potassium fluoride solution (200g / L)

[0032] 1.9. Ethanol solution of dimethylglyoxime (10g / L): Weigh 10g of dimethylglyoxime into a 1000ml beaker, add 1000ml of ethanol (ρ=0.789g / L), and stir until the dimethylglyoxime is completely dissolved.

[0033] 1.10. Xylenol Orange (1g / L)

[0034] 1.11. Acetic acid-sodium acetate solution (PH=6): Weigh 10g of sodium acetate (CH 3 COONa·3H 2 O) Add 10ml of acetic acid (1mol / L) to a 100ml measuring cup, dilute to 100ml with water, and mix well.

[0035] 1....

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Abstract

The invention relates to a method for measuring the cadmium content in a waste nickel-cadmium battery, which comprises the steps of aqua regia solution sampling, iron and nickel removing, cadmium and cobalt amount measurement by a back titration method, cobalt content measurement by a conventional method, and the like, and finally the cadmium content is calculated by subtraction. The method has small error, accurate result and high precision, makes up the gap of measuring cadmium in the waste nickel-cadmium battery, and has an important meaning for healthily developing the waste nickel-cadmium battery recycling industry.

Description

technical field [0001] The invention relates to a method for measuring cadmium content in waste nickel-cadmium batteries. Background technique [0002] Waste nickel-cadmium batteries contain heavy metal cadmium, which is more harmful to the environment and human health than other batteries. As early as February 2003, the European Commission promulgated the "Directive on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment" (RoHs Directive), stipulating that the content of cadmium should not exceed 100ppm. Therefore, the recycling of waste nickel-cadmium batteries has been highly concerned by the state and all walks of life. [0003] At present, although the state has formulated some policies and management methods related to the recycling of used batteries, the relevant national standard documents and implementation methods have not been established. Waste nickel-cadmium batteries are high-hazardous wastes, and the determination...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N21/79G01N1/38G01N1/44
Inventor 谢明宏谭静进吴开洪罗茜
Owner GUANGDONG BRUNP RECYCLING TECH
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