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Method for recovering nickel sulfate from nickel electroplating waste liquid

A technology for electroplating nickel and nickel sulfate, applied in nickel sulfate, chemical instruments and methods, metallurgical wastewater treatment, etc., can solve the problems of high treatment cost, increase the difficulty of recovery, inability to handle, etc., and achieve high economic value and wide application range. , the effect of reducing processing costs

Inactive Publication Date: 2020-05-19
湖南中冶艾迪环保资源开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is only suitable for nickel sulfate or nickel chloride solution, and for the electroplating waste solution containing a large amount of nickel sulfamate and various complex organic complexing agents, there are still a large number of nickel ions in the solution that cannot be extracted
Moreover, each electroplating enterprise produces hundreds of liters to several tons of electroplating waste liquid every month. For each electroplating enterprise, it is impossible to adopt this method
[0005] Therefore, so far, most electroplating enterprises have directly handed over the electroplating waste liquid to a third party for disposal, and the enterprise has paid a high processing fee accordingly, and the third party has mixed the electroplating waste liquid of each enterprise together, which increases the difficulty of recycling , can't even handle

Method used

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  • Method for recovering nickel sulfate from nickel electroplating waste liquid
  • Method for recovering nickel sulfate from nickel electroplating waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Get 500mL certain enterprise electroplating nickel waste solution (nickel exists in the complex form), configure 150mL medicament (containing 15gNaOH and 5g NaOH 2 S 2 o 4 ). At the same time, nickel electroplating waste liquid and chemicals were added, heated and stirred in a water bath, the temperature was maintained at 80°C, and the reaction time was 2 hours. 500 mL of waste water consumed 100 mL of chemicals, and the stirring and heating were stopped. Vacuum filtration is then carried out for separation to obtain crystalline nickel hydroxide.

Embodiment 2

[0036] Get 500mL certain enterprise electroplating nickel waste liquid (same as in embodiment 1), add 10% sodium hydroxide solution, and add reduced iron powder simultaneously. Heat and stir in a water bath, maintain the temperature at 80°C, and react for 2 hours. 500mL of wastewater consumes 100mL of sodium hydroxide solution and 5g of reduced iron powder, and stop stirring and heating. Carry out vacuum filtration again and separate, obtain the mixture of the nickel hydroxide of crystal and a large amount of ferric hydroxide, introduce a large amount of impurity. In addition, the amount of hydroxide obtained in this example was significantly less than that obtained in Example 1, and nickel ions remained too much.

Embodiment 3

[0038] Get 500mL certain enterprise electroplating nickel waste liquid (same as in embodiment 1), add 10% sodium hydroxide solution, and add sodium thiosulfate simultaneously. Heat and stir in a water bath, maintain the temperature at 80 °C, and react for 2 hours. 500 mL of waste water consumes 100 mL of sodium hydroxide solution and 5 g of sodium thiosulfate, and stops stirring and heating. Carry out vacuum filtration again and separate, obtain the nickel hydroxide of less crystal. The amount of nickel hydroxide obtained in this embodiment is obviously less than that obtained in embodiment 1, and nickel ions remain too much.

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Abstract

The invention discloses a method for recovering nickel sulfate from nickel electroplating waste liquid. The method comprises the following steps: (1) adding alkali liquor and sodium hydrosulfite intothe nickel electroplating waste liquid, carrying out heating and stirring, and carrying out solid-liquid separation after a reaction to obtain filter residues and a filtrate; (2) carrying out acid dissolution on the filter residues to obtain an acid-soluble solution, wherein a pH value of an acid dissolution end point is 5 or below; (3) adding an extraction agent into the acid-soluble solution toextract nickel so as to obtain a water phase and an oil phase enriched with nickel ions, and adding sulfuric acid into the oil phase enriched with the nickel ions for reverse extraction so as to obtain a nickel sulfate solution; and (4) carrying out evaporation concentration, cooling crystallization and solid-liquid separation on the nickel sulfate solution to obtain a liquid phase and a solid phase, and collecting the solid phase to obtain nickel sulfate. According to the method, on the premise that the treatment cost of the nickel electroplating waste liquid of an enterprise is greatly reduced, high-quality and high-value byproducts can be obtained, and an economic value is high.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a treatment method for electroplating nickel waste liquid. Background technique [0002] Electroplating is one of the industries with serious pollution. The three wastes produced have seriously polluted the living environment of human beings, especially the electroplating waste solution is the most harmful. Moreover, the electroplating waste liquid also contains a large amount of precious metals, and if it is not recycled, it will also cause a waste of resources. [0003] In the electroplating industry, after a certain period of use, the composition of the plating solution will change to a certain extent, which will affect the quality of the coating. At this time, this part of the plating solution cannot continue to be used. The storage is handed over to a third party for disposal. Even with purification, there is still a part of the electroplating solution that cannot be re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01G53/10C02F101/20C02F103/16
CPCC01G53/10C02F1/001C02F1/62C02F2101/20C02F2103/16
Inventor 岳士翔朱墨
Owner 湖南中冶艾迪环保资源开发有限公司
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