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Method for realizing nickel recovery in electroplating sludge

A technology for recycling electroplating sludge and nickel, applied in the field of environmental protection and resource utilization, can solve problems such as poor selectivity, low impurity selectivity, and low leaching rate.

Inactive Publication Date: 2012-04-04
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The main feature of the acid leaching method is that it has a better leaching effect on valuable metals such as copper, zinc, and nickel, but has a low selectivity to impurities, especially poor selectivity to impurities such as chromium and iron; while ammonia leaching The law has high selectivity to impurities such as chromium and iron, but low leaching rate to copper, zinc, nickel, etc.

Method used

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Embodiment Construction

[0007] The present invention is achieved in that a method for realizing nickel recovery in electroplating sludge comprises the steps in the following order:

[0008] ①Leach the heavy metals contained in the electroplating sludge with mixed acid, and the dosage of mixed acid is 50-100mL / 10g electroplating sludge;

[0009] ②NaOH adjusts the pH value of the leaching solution, and adds a chelating-extracting compound agent to realize the separation of nickel and other coexisting heavy metals and the enrichment of nickel;

[0010] ③ Add 10% sulfuric acid to the nickel-containing extract for back extraction, to recycle nickel and realize the reuse of the composite extractant.

[0011] Above-mentioned step 1. the mixed acid that adopts is made up of nitric acid and hydrochloric acid, and the control volume ratio is 3: 1;

[0012] The pH value described in the above step ② is controlled within the range of 4.0 to 7.0;

[0013] The chelation-extraction complex agent adopted in the ab...

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Abstract

The invention relates to a method for realizing nickel recovery in electroplating sludge, which comprises the following steps that: heavy metal contained in the electroplating sludge is leached by mixed acid; the pH value is regulated, compound extracting agents are added, and separation of nickel from other coexistence metal and the nickel enrichment are realized; and sulfuric acid is added into the nickel-containing extraction liquid for carrying out reverse extraction, the nickel resource recovery is carried out, and the reuse of the compound extracting agents is realized. In the method, a compound extraction system is adopted for recovering valued metal nickel in the electroplating sludge, the metal resource utilization rate is high, the product addition value is high, the method belongs to a clean production process, no new three-waste is generated, and in addition, the production cost is relatively low.

Description

Technical field: [0001] The invention belongs to the field of environmental protection and resource utilization. Background technique: [0002] Electroplating sludge is the discharge produced in the process of electroplating wastewater treatment, which contains a large amount of toxic heavy metals such as chromium, cadmium, nickel, zinc, etc., and its composition is very complex, which belongs to hazardous solid waste. At present, due to many problems in my country's electroplating industry, such as many factories, small scale, low level of equipment and low level of pollution control, most of the electroplating sludge is still simply landfilled or even piled up randomly, causing serious pollution to the environment. . Therefore, how to adopt effective technology to treat and dispose of electroplating sludge, and realize its stabilization, harmlessness and resource utilization have always been the focus of research at home and abroad. [0003] At present, the research on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/06C22B3/40C22B23/00
CPCY02P10/20
Inventor 严金龙全桂香丁成
Owner YANCHENG INST OF TECH
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