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Method for comprehensively recycling zinc and cadmium from cadmium scum

The technology of scum and pulp is applied in the field of comprehensive recovery and utilization of zinc and cadmium from cadmium scum.

Pending Publication Date: 2022-07-08
BAIYIN NONFERROUS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the cadmium scum is stockpiled, it will not only cause resource loss and waste, but also cause certain pollution to the environment. Therefore, it is necessary to comprehensively recycle the cadmium scum

Method used

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  • Method for comprehensively recycling zinc and cadmium from cadmium scum

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment comprehensively recycles zinc and cadmium from cadmium scum. The main components in the cadmium scum are: Zn: 23.47%, Cd: 39.52% in weight percentage.

[0020] (1) Take 450 grams of cadmium scum, add water to the cadmium scum at a liquid-solid volume ratio of 5:1 and heat it to a water temperature of 70° C. Slowly add concentrated sulfuric acid at the same time. When the pH value of the solution is less than or equal to 4.5, stop adding concentrated sulfuric acid. Continue the reaction, when the pH value of the solution is higher than 5.0, add concentrated sulfuric acid until the pH value is 4.5, stop adding acid, repeat the above process of adding concentrated sulfuric acid, when the pH value of the pulp is stable between 4.5-5.0 for 30min, the end In the pickling operation of cadmium scum, the pH value of the pulp at the end point is 4.5, and the whole pickling process lasts for 1.0h; the purpose of this process is to make the soluble substances such as...

Embodiment 2

[0026] This embodiment comprehensively recycles zinc and cadmium from cadmium scum. The main components in the cadmium scum are: Zn: 29.92%, Cd: 34.82% in weight percentage.

[0027] (1) Take 320 grams of cadmium scum, add water to the cadmium scum at a liquid-solid volume ratio of 5:1, and heat it to a water temperature of 70° C. Slowly add concentrated sulfuric acid at the same time. When the pH value of the solution is less than or equal to 4.5, stop adding concentrated sulfuric acid. Continue the reaction, when the pH value of the solution is higher than 5.0, add concentrated sulfuric acid until the pH value is 4.5, stop adding acid, repeat the above process of adding concentrated sulfuric acid, when the pH value of the pulp is stable between 4.5-5.0 for 30min, the end In the pickling operation of cadmium scum, the pH value of the pulp at the end point is 4.5, and the whole pickling process lasts for 1.0h; the purpose of this process is to make the soluble substances such a...

Embodiment 3

[0033] This embodiment comprehensively recycles zinc and cadmium from cadmium scum. The main components in the cadmium scum are: Zn: 29.21%, Cd: 36.12% in weight percentage.

[0034] (1) Take 410 grams of cadmium scum, add water to the cadmium scum at a liquid-solid volume ratio of 5:1 and heat it to a water temperature of 70°C, and slowly add concentrated sulfuric acid, when the pH value of the solution is less than or equal to 4.5, stop adding concentrated sulfuric acid, Continue the reaction, when the pH value of the solution is higher than 5.0, add concentrated sulfuric acid until the pH value is 4.5, stop adding acid, repeat the above process of adding concentrated sulfuric acid, when the pH value of the pulp is stable between 4.5-5.0 for 30min, the end In the pickling operation of cadmium scum, the pH value of the pulp at the end point is 4.5, and the whole pickling process lasts for 1.0h; the purpose of this process is to make the soluble substances such as zinc, sodium ...

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Abstract

The invention discloses a method for comprehensively recycling zinc and cadmium from cadmium scum, which relates to the technical field of hydrometallurgy and comprises the following steps: pickling the cadmium scum, carrying out solid-liquid separation, leaching the cadmium scum, filtering and recycling. A high-temperature washing-physical screening-manganese dioxide oxidation-hot acid leaching method is adopted for treatment, cadmium scum generated by a cadmium production system is subjected to high-temperature washing to obtain washing dissolved ore pulp, then physical screening is performed to obtain liquid ore pulp and lumps, the liquid ore pulp is subjected to manganese dioxide oxidation and high-temperature leaching, and the lumps are obtained. According to the method, zinc and cadmium in liquid are leached to the maximum extent to enter the liquid and return to the corresponding wet process, it is guaranteed that valuable metal resources such as zinc and cadmium are recycled, waste cadmium scum is effectively utilized, good economic benefits are achieved, and environmental pollution caused by stacking and storing of the cadmium scum is reduced through recycling of the cadmium scum.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, and more particularly to a method for comprehensively recycling zinc and cadmium from cadmium scum. Background technique [0002] Cadmium scum is a kind of hazardous waste slag produced in the zinc hydrometallurgy purification process. Its main components are cadmium, zinc and sodium. Cadmium is mainly sandwiched in the cadmium scum in the form of cadmium particles, cadmium blocks and cadmium oxide. Sodium mainly exists in the form of sodium zincate, of which valuable metals such as zinc and cadmium account for more than 55%. If the cadmium scum is stored for disposal, it will not only cause the loss and waste of resources, but also cause certain pollution to the environment. Therefore, it is necessary to comprehensively recycle the cadmium scum. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is: in order to solve the above-mentioned technical problems, the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B17/00C22B1/00C22B3/00C22B19/30
CPCC22B7/007C22B17/04C22B19/30C22B1/005Y02P10/20
Inventor 冶玉花崔耀焦晓斌赵贵俊李彩莲段小维刘燕王泽仁谢宏涛
Owner BAIYIN NONFERROUS GROUP
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