Set technique for extracting cadmium from waste and old nickel-cadmium battery, and producing ferro-nickel alloy

A technology of nickel-cadmium battery and nickel-iron alloy, which is applied in the complete process of producing nickel-iron alloy and the field of extracting cadmium, which can solve the problems of poor operability, low purity of recovered metal, and low recovery rate, and achieve no secondary pollution and considerable economic benefits , the effect of good social benefits

Inactive Publication Date: 2008-07-16
NANJING UNIV
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AI Technical Summary

Problems solved by technology

The existing treatment process mainly has problems such as low purity of recovered metals, low recovery rate, and poor operability.

Method used

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  • Set technique for extracting cadmium from waste and old nickel-cadmium battery, and producing ferro-nickel alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Use a scissor crusher to crush waste nickel-cadmium batteries, and keep more than 80% of the outlet particle size at 5mm.

[0019] (2) Fill the crushed nickel-cadmium batteries into a low-temperature roasting kiln for roasting, operate intermittently, and the roasting time is 7-8 hours. The inlet temperature of the heating gas is 400°C, and the outlet temperature is 200°C. As the operation progresses, the outlet temperature will increase, but it will not affect the drying and carbonization effects.

[0020] h 2 o (l) →H 2 o (g)

[0021] Organic matter → C+H 2 o (g) + other substances

[0022] (3) Mix the calcined battery and carbon powder evenly according to the mass ratio of 100:1, carry out a vacuum distillation, keep the calcination temperature at 900-1000°C, the vacuum degree at 100Pa, and the distillation time at 7-8h. Cadmium vapor is condensed with water. The furnace uses coal as fuel, and the design temperature is 1200°C.

[0023...

Embodiment 2

[0033] Other conditions are constant, change the crushing mode in (1) of embodiment 1 into the licker-in roller crusher and change the vacuum degree of vacuum distillation into 80Pa, the final cadmium recovery rate is 99.5%, the cadmium precision is 99.9%, and the nickel recovery rate is 99.5%. 100%, iron and nickel account for 91% in nickel-iron alloy.

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Abstract

The invention discloses a complete set of technique which can extract cadmium and produce ferronickel alloy from waste nickel to cadmium cell. The invention crushes the waste nickel to cadmium cell and then put the waste nickel to cadmium cell into a low temperature roasting kiln to carry out preroast, and the roasted materials and the reducing agent are mixed to conduct vacuum distillation to collect the product of cooling section and after refining, excellent cadmium is produced; the materials that are not vaporized can produce ferronickel alloy after being refined. The invention realizes the separation and exaction of cadmium and ferronickel in the waste nickel to cadmium cell; wherein, the cadmium recycle ratio with the high efficiency cadmium recycle technology can reach 99.8 percent, and the cadmium purity is more than 99.9 percent. Metal cadmium is completely recycled, thus the waste is fully used and no secondary pollution is formed and considerable economic benefit and good social benefit are created.

Description

technical field [0001] The invention belongs to the field of resource recovery, and in particular relates to a complete process for extracting cadmium from waste nickel-cadmium batteries and producing nickel-iron alloy. Background technique [0002] Waste nickel-cadmium batteries contain a large amount of nickel and cadmium (116-556 grams of Ni and 11-173 grams of Cd per kilogram of waste battery). If these heavy metals leak, they will cause great harm to the human body and the environment, and even bring Some catastrophic crises, such as the "Itai-Itai" incident, a public nuisance incident that occurred in the Jinzugawa River Basin in Toyama Prefecture, Japan from 1955 to 1972, were caused by excessive cadmium. [0003] At present, many researchers have explored the recovery of nickel-cadmium batteries. The commonly used methods are fire method and wet method, and there is also a combined process of fire method and wet method. Among them, the wet method can be recycled due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B17/00C22B1/14C22B1/02C22B5/16C22C1/02C22B5/10
CPCY02P10/20
Inventor 郑正聂耳罗兴章彭晓成盛国大周培国冯景伟赵国华李坤权高顺枝张继彪李继红黄星发李军状李培培孟卓
Owner NANJING UNIV
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