Recycling method for nickel in nickel-cadmium-zinc slag

A recovery method, nickel-cadmium technology, applied in the field of comprehensive recovery and treatment of nickel-cadmium-zinc waste slag, can solve the problems of unfavorable smelting reduction, low nickel recovery rate, low value, etc., achieve complete separation of nickel-cadmium-zinc, high nickel recovery rate, short process effect

Inactive Publication Date: 2016-02-17
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this new technology described by this patented inventor relates to an improved way to extract valuable metals from mixed metal materials such as those found around batteries or other sources that contain these elements during manufacturing processes. This results in better quality products while reducing waste compared to previous methods like pyrometallurgy which required multiple steps involving different chemicals.

Problems solved by technology

There have been previous attempts at recovering valuable metallic components such as cobalt (Co) through various processes involving different types of material like spent battery cells that contain these metals. However, current techniques involve complicated steps and can result in poor yield rates due to impurities remaining behind certain metals making them difficult to reuse back up properly without causing harmful effects on other parts of the system's environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Add 1000g of nickel-cadmium-zinc slag containing 63.7% nickel, 1.6% cadmium and 32.3% zinc to 1.24L of 8mol / L sodium hydroxide solution, and leaching at 20°C for 15h;

[0020] (2) The leaching residue is washed with 1mol / L sodium hydroxide solution until the leaching residue contains 0.01% zinc, and then washed with water until the washing water pH=9;

[0021] (3) Obtain 675.2g of leaching slag, the composition of which is Ni94.31%, Cd2.36%, Zn0.01%, O3.13%, smelting the leaching slag in an intermediate frequency furnace at 900°C for 5h, adding 63.4g of charcoal during smelting , the cadmium oxide and nickel oxide in the slag are reduced to simple cadmium and nickel, the volatilized cadmium is recovered in the dust collection equipment, and the recovered cadmium powder is Ni0.003%, Zn0.001%, Cd99.12%;

[0022] (4) After the reduction, the nickel was poured into nickel ingots to obtain 637.2g of nickel ingots, the composition of which was Ni98.99%, Cd0.0078%, Zn0.004...

Embodiment 2

[0024] (1) Add 100kg of nickel-cadmium-zinc slag containing 56.3% nickel, 3.72% cadmium, and 38.9% zinc to 144L of 10mol / L sodium hydroxide solution, and leaching at 40°C for 20h;

[0025] (2) The leaching residue is washed with 2mol / L sodium hydroxide solution until the leaching residue contains 0.07% zinc, and then washed with water until the washing water pH=7;

[0026] (3) Obtain 60.8kg of leaching slag, the composition of which is Ni89.47%, Cd6.05%, Zn0.03%, O3.87%, smelting the leaching slag in an intermediate frequency furnace at 800°C for 3 hours, adding 11.8kg of charcoal during smelting , the cadmium oxide and nickel oxide in the slag are reduced to simple cadmium and nickel, the volatilized cadmium is recovered in the dust collection equipment, and the recovered cadmium powder is Ni0.007%, Zn0.005%, Cd97.72%;

[0027] (4) After the reduction, the nickel was atomized into nickel powder, and 54.1kg of atomized nickel powder was obtained, the composition of which was N...

Embodiment 3

[0029] (1) Add 3000g of nickel-cadmium-zinc slag containing 26.3% nickel, 7.04% cadmium and 43.2% zinc to 4L of 9mol / L sodium hydroxide solution, and leaching at 30°C for 17h;

[0030] (2) The leaching residue is washed with 1.5mol / L sodium hydroxide solution until the leaching residue contains 0.04% zinc, and then washed with water until the washing water pH=8;

[0031] (3) 1371.8g of leaching slag was obtained, the composition of which was Ni56.79%, Cd15.19%, Zn0.035%, O27.14%. The leaching slag was smelted in an intermediate frequency furnace at 850°C for 4 hours, and 1489g of charcoal was added during smelting. The cadmium oxide and nickel oxide in the slag are reduced to simple cadmium and nickel, and the volatilized cadmium is recovered in the dust collection equipment. The recovered cadmium powder is composed of Ni0.017%, Zn0.002%, and Cd98.56%;

[0032] (4) After the reduction, the nickel was atomized into nickel powder, and 785.1g of atomized nickel powder was obtaine...

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PUM

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Abstract

The invention discloses a recycling method for nickel in nickel-cadmium-zinc slag, and relates to a comprehensive recycling method for nickel-cadmium-zinc waste residues generated in a waste nickel-cadmium battery recycling and metallurgical process. The recycling method is characterized in that a recycling process for the recycling method comprises the following steps: (1) adding the nickel-cadmium-zinc slag into a sodium hydroxide solution to carry out leaching; (2) washing the obtained leached residues; (3) drying the washed leached residues, then, carrying out reduction smelting for reducing cadmium oxide and nickel oxide in the slag into elementary-substance cadmium and elementary-substance nickel, and recycling volatilized cadmium in dust collecting equipment; and (4) after the reduction is ended, continuously smelting the rest of nickel, and pouring the rest of nickel into a nickel ingot or atomizing the rest of nickel into nickel powder. Compared with a conventional recycling process, the recycling method for nickel in the nickel-cadmium-zinc slag has the advantages of being short in process, complete in nickel-cadmium-zinc separation, high in a nickel recovery rate, and the like.

Description

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Claims

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Application Information

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Owner JINCHUAN GROUP LIMITED
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