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Recovery method of nickel element and zinc element

A recovery method and technology of nickel element, applied in the direction of improving process efficiency, can solve the problems of low recovery rate of nickel element and complicated treatment process, and achieve the effects of low production cost, simple equipment and improved recovery rate

Active Publication Date: 2019-09-06
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a recovery method for nickel and zinc to solve the problems of low recovery rate of nickel and complicated treatment process when the existing treatment method treats sludge with relatively high zinc content

Method used

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  • Recovery method of nickel element and zinc element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The electroplating sludge was subjected to sulfuric acid leaching reaction, the liquid-solid ratio was 6:1, the reaction temperature was 70°C, the treatment time was 4h, and the final acidity was 4.9g / L to obtain the leaching solution. Extraction agent P204 is used to extract the copper in the leachate obtained after filtration, and separate to obtain a raffinate. Milk of lime is added to the obtained raffinate to carry out neutralization reaction, so that chromium element is precipitated, and the terminal pH value of the reaction system is controlled to be 5 at the same time. Filter to obtain chromium removal solution and chromium-containing precipitate. Oxygen is passed into the above-mentioned chromium removal solution to oxidize and precipitate iron, and then liquid-solid separation is performed to obtain a nickel-zinc-rich solution.

[0046] Add milk of lime with a concentration of 20wt% to the above nickel-zinc rich solution to carry out precipitation reaction, a...

Embodiment 2

[0051] The electroplating sludge was subjected to sulfuric acid leaching reaction, the liquid-solid ratio was 5:1, the reaction temperature was 80°C, the treatment time was 5 hours, and the final acidity was 7.8g / L to obtain the leaching solution. Extraction agent P204 is used to extract the copper in the leachate obtained after filtration, and separate to obtain a raffinate. Milk of lime is added to the obtained raffinate to carry out neutralization reaction, so that chromium element is precipitated, and the terminal pH value of the reaction system is controlled to be 5 at the same time. Filter to obtain chromium removal solution and chromium-containing precipitate. Oxygen is passed into the above-mentioned chromium removal solution to oxidize and precipitate iron, and then liquid-solid separation is performed to obtain a nickel-zinc-rich solution.

[0052] Add milk of lime with a concentration of 25wt% to the above nickel-zinc rich solution for precipitation reaction, and a...

Embodiment 3

[0057] The difference from Example 1 is: during the precipitation reaction, the pH of the reaction system was adjusted to 10.

[0058] The analysis shows that the recovery rate of nickel is 90.26wt%, and the recovery rate of zinc is 85.30wt%.

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Abstract

The invention discloses a recycling method for a nickel element and a zinc element. The recycling method comprises the following steps: pretreatment is carried out on electroplating sludge to remove acopper element, a chromium element and an iron element in the electroplating sludge so as to obtain a zinc-nickel enrichment solution, wherein the electroplating sludge contains the copper element, the nickel element, the iron element, the chromium element and the zinc element; the zinc-nickel enrichment solution and a precipitant undergo the precipitation reaction to obtain a mixture containingnickel-containing precipitates and zinc-containing precipitates; and the mixture and an alkali liquor undergo the dissolution reaction to obtain a zinc-containing solution and a nickel-containing precipitate. According to the recycling method, on one hand, impurity elements in the electroplating sludge can be removed so that the generation of accessory substances in the recycling process can be reduced, the recycling rate of the zinc element and the nickel element can be improved, and relatively pure nickel products and zinc products can be obtained; and on the other hand, the recycling methodhas the advantages of being short in process, simple in device and low in production cost so that the treating process of the electroplating sludge can become harmless, the waste can be changed intowealth, and effective utilization of the waste can be carried out.

Description

technical field [0001] The invention relates to the field of electroplating wastewater treatment, in particular to a method for recovering nickel and zinc elements. Background technique [0002] Electroplating sludge is the discharge produced in the process of electroplating wastewater treatment, which contains a large amount of heavy metals such as nickel, iron, chromium, zinc and organic waste, and has been included in the national hazardous waste list. According to incomplete statistics, my country's electroplating enterprises produce about 10 million tons of electroplating sludge every year. From the perspective of environmental protection and resource utilization, such a large amount of electroplating sludge needs to be treated in a harmless and resourceful manner. [0003] At present, the treatment methods of electroplating sludge include solidification method, thermochemical method, smelting method, roasting leaching method, and valuable metal leaching method. The t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B19/20C22B19/30C22B23/00
CPCY02P10/20
Inventor 陆业大申美玲戴江洪李俊赵鹏飞吴筱李少龙殷书岩
Owner CHINA ENFI ENGINEERING CORPORATION