Method for reclaiming metal cadmium from cadmium-containing waste material

A metal cadmium and waste technology, applied in the direction of improving process efficiency, can solve the problems of high energy consumption and complicated steps, and achieve the effects of low energy consumption, simple steps, and promoting evaporation and condensation.

Inactive Publication Date: 2008-06-04
浙江文国重工机械有限公司
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AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for recovering metal cadmium from cadmium-containing waste with low energy consumption and simple steps in order to overcome the disadvantages of high energy consumption and cumbersome steps of the existing method for recovering metal cadmium from cadmium-containing waste

Method used

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Examples

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Embodiment 1-10

[0024] Examples 1-10 are used to illustrate the method for recovering metal cadmium from cadmium-containing waste of the present invention.

[0025] Separate the positive and negative poles of waste nickel-cadmium batteries, place 20 kilograms of negative poles in a container with airtightness and a circulation system (the bottom and top of the container have interfaces, and the caliber of the bottom interface is smaller than that of the top interface). Contact with air under the conditions shown in Table 1. Then the whole negative electrode is crushed and passed through a nylon sieve with a mesh size of 1 cm to obtain a powder mixture containing cadmium oxide. 16 kg of this powder mixture is placed in a container with airtightness and a circulation system. Under the conditions shown in Table 2, the main airflow blows to the powder from top to bottom, and the auxiliary airflow blows from bottom to top. The powder is reduced and condensed, and metal cadmium solid particles that ...

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Abstract

The invention relates to a method for reclaiming cadmium metals from cadmiferous waste materials, comprising the following steps: organic substances and water in the cadmiferous waste materials are removed; cadmium oxides in the cadmiferous waste materials after removal of the organic substances and the water are reduced to elementary cadmiums in reducing atmosphere; the elementary cadmiums are then evaporated into cadmium vapor; the cadmium vapor is condensed into cadmium metals, wherein, the reducing atmosphere is formed by reducing gas which comprises main air flow and auxiliary air flow; the main air flow and the auxiliary air flow conversely blows towards the cadmiferous waste materials after removal of the organic substances and the water; linear velocity of the auxiliary air flow is higher than that of the main air flow. The method for reclaiming the cadmium metals from the cadmiferous waste materials provided by the invention has the advantages of low energy consumption and simple procedures.

Description

technical field [0001] The invention relates to a method for recovering metal cadmium, more particularly to a method for recovering metal cadmium from waste materials containing cadmium. Background technique [0002] Nickel-cadmium batteries have the advantages of large capacity, long life, simple manufacture and low cost, and the number of cycles can reach hundreds or even thousands of times. With the development of the national economy, nickel-cadmium batteries have been widely used in power supply systems for national defense, fire protection, aerospace, household appliances, office machines, communication equipment, and electric tools. [0003] A nickel-cadmium battery generally includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. The negative electrode includes a negative electrode conductive matrix and a negative electrode material coated on the negative electrode conductive matrix or filled in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B17/00C22B7/00C22B5/12C22B5/16
CPCY02P10/20
Inventor 陈潜
Owner 浙江文国重工机械有限公司
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