Method for recycling and refining nickel and cadmium in solid hazardous wastes

A hazardous waste and solid technology, applied in the direction of improving process efficiency, can solve the problems of long process flow, high equipment requirements and increased cost input of extraction method, and achieve the effect of broadening the scope of application, reducing the process flow and improving the metal grade.

Active Publication Date: 2014-11-12
CHINA WEST NORMAL UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The extraction method not only has a long process flow, but also incomplete separation of nickel and cadmium, and a large amount of metal loss; when the process of separating NiO and CdO by acid leaching is used in industry, the conditions are not easy to control; in the emulsion liquid membrane

Method used

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  • Method for recycling and refining nickel and cadmium in solid hazardous wastes
  • Method for recycling and refining nickel and cadmium in solid hazardous wastes
  • Method for recycling and refining nickel and cadmium in solid hazardous wastes

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Embodiment 1

[0043] figure 1 It is a process flow diagram of the present invention.

[0044] (1) Nickel carbonate, cadmium carbonate intermediate product wet sample analysis: Obtain nickel carbonate, cadmium carbonate intermediate product wet sample containing nickel, cadmium, calcium, magnesium, zinc, iron from the production line, dry the wet sample to constant weight (mass. m 1 ), the measured wet sample moisture of nickel carbonate and cadmium carbonate intermediate product is 64.47%wt. Stir and wash the dried and finely ground raw materials with 40°C distilled water (solid-to-liquid mass ratio 1:5) for 20 minutes, change the water and wash repeatedly 3 times to wash off most of the soluble salt sodium sulfate (Na 2 SO 4 ), the filter cake was dried to constant weight after filtration (mass m 2 ), the weight loss rate after stirring and washing the fine raw material after drying is 34.70% (weight loss rate=(m 1 —m 2 ) / m 1 *100%). The dried filter cake was ground into fine piece...

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Abstract

The invention discloses a method for recycling and refining nickel and cadmium in solid hazardous wastes. The method disclosed by the invention comprises the following steps: reducing semi-finished products by using a carbon-containing reducing agent, wherein the semi-finished products are nickel carbonate and cadmium carbonate which are generated during a treatment process of hazardous wastes containing heavy metals including nickel and cadmium and contain lots of nickel and cadmium and less magnesium, caecum and iron; then carrying out acid leaching; controlling the condition to ensure that cadmium oxide in the system is dissolved but the metallic nickel is not dissolved so as to realize separation of nickel and cadmium; melting the separated metallic nickel at the temperature of 1600 DEG C to form a nickel ingot product of which the grade is above 99%; putting a Cd<2+> solution obtained through dissolution into a workshop process and precipitating the solution by using sodium carbonate so as to obtain a CdCO3 product of which the purity is higher than 98%. The method disclosed by the invention can be used for greatly reducing energy consumption and environmental pollution and has the advantages of short process and easy control over conditions; substances contained in raw materials need not to be purified specially, a high-purity product can be obtained under the condition that the procedures are reduced; the reducing agent is selected conveniently according to local production conditions and is low in cost.

Description

technical field [0001] The invention relates to the technical field of heavy metal-containing hazardous waste treatment and metal recovery, in particular to a method for recovering and refining nickel and cadmium in solid hazardous waste. Background technique [0002] Nickel is a white ferromagnetic metal with the advantages of corrosion resistance, oxidation resistance, high mechanical strength and good ductility. It is widely used in metallurgy, chemical industry, petroleum, construction, machinery, transportation, spacecraft, instrumentation, light industry and other departments. It is an important raw material for manufacturing superalloys, special alloys and stainless steel. It is also used for casting coins and producing jewelry. and medical. Cadmium carbonate is widely used in production, and can be used as an intermediate for the manufacture of polyester, a flux for glass pigments, a catalyst for organic reactions, a plasticizer, a stabilizer for plastics, and a raw...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B17/00C22B23/00
CPCY02P10/20
Inventor 杨秀培王修海贾智慧林光勤
Owner CHINA WEST NORMAL UNIVERSITY
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