Method and equipment for preparing electroplating-grade nickel sulfate from nickel-containing wastewater produced in surface treatment process

A technology of surface treatment and nickel sulfate, applied in nickel sulfate, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of high safety treatment cost, complicated process, environmental hazards, etc., save manpower and material resources, improve Economic benefits, the effect of eliminating potential harm

Active Publication Date: 2014-12-24
MEIZHOU ENVIRONMENTAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively high cost of safe treatment, unscrupulous companies often secretly discard the heavy metal-containing sludge or directly discharge the heavy metal-containing wastewater, causing major environmental hazards
At present, there are also smelting enterprises that carry out pyrometallurgical smelting of sludge containing copper and nickel to obtain mixed metals containing copper and nickel, and then obtain relatively pure single metal compounds through other impurity removal and separation processes. This method is not only complicated , high energy consumption, and the risk of secondary pollution; nickel is an important metal resource on the earth, which is even scarcer in our country. It is widely used in steel, catalytic chemistry, surface treatment, etc. To import a large amount of nickel products from abroad

Method used

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  • Method and equipment for preparing electroplating-grade nickel sulfate from nickel-containing wastewater produced in surface treatment process
  • Method and equipment for preparing electroplating-grade nickel sulfate from nickel-containing wastewater produced in surface treatment process
  • Method and equipment for preparing electroplating-grade nickel sulfate from nickel-containing wastewater produced in surface treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of method that utilizes the nickel-containing waste water that surface treatment process produces to prepare electroplating grade nickel sulfate, this method comprises the following steps:

[0035] (1) The nickel-containing waste water produced in the surface treatment process is separately collected by a collection tank;

[0036] (2) Pump the nickel-containing wastewater into the sedimentation tank, pump the soluble lye or carbonate solution in the first liquid storage tank into the sedimentation tank for mixed reaction, and the pH value range of the solution after the reaction is 8.3-8.5 to obtain a nickel-containing water-insoluble solid compound, which is separated by pressure filtration with a filter press to obtain a nickel slime solid with a water content of 70-90%.

[0037] (3) The nickel mud solid containing moisture is broken into nickel mud by a beating tank with a stirrer; the particle size of the nickel mud is more than 70 mesh.

[0038] (4) Nickel ...

Embodiment 2

[0042] A kind of method that utilizes the nickel-containing waste water that surface treatment process produces to prepare electroplating grade nickel sulfate, this method comprises the following steps:

[0043] (1) The nickel-containing waste water produced in the surface treatment process is separately collected by a collection tank;

[0044] (2) Nickel-containing wastewater is pumped into the sedimentation tank, and the soluble carbonate in the first liquid storage tank is pumped into the sedimentation tank for mixed reaction. The pH value range of the solution after the reaction is 8.3-10, and nickel-containing The water-insoluble solid compound is separated by pressure filtration with a filter press to obtain nickel slime solid with a water content of 70-90%.

[0045] (3) The nickel mud solid containing moisture is broken into nickel mud by a beating tank with a stirrer; the particle size of the nickel mud is more than 70 mesh.

[0046] (4) Pump the nickel slurry into th...

Embodiment 3

[0050] A kind of method that utilizes the nickel-containing waste water that surface treatment process produces to prepare electroplating grade nickel sulfate, this method comprises the following steps:

[0051] (1) The nickel-containing waste water produced in the surface treatment process is separately collected by a collection tank;

[0052] (2) Pump nickel-containing wastewater into the sedimentation tank, pump the mixture of soluble alkali and soluble carbonate in the first liquid storage tank into the sedimentation tank for mixed reaction, and the pH value range of the solution after the reaction is 8.3- 10. A nickel-containing water-insoluble solid compound is obtained, which is separated by pressure filtration with a filter press to obtain a nickel slime solid with a water content of 70-90%.

[0053] (3) The nickel mud solid containing moisture is broken into nickel mud by a beating tank with a stirrer; the particle size of the nickel mud is more than 70 mesh.

[0054...

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Abstract

The invention discloses a method and equipment for preparing electroplating-grade nickel sulfate from nickel-containing wastewater produced in a surface treatment process, and belongs to the technical field of nickel-containing wastewater treatment process. The method is characterized by comprising the following steps: (1) collecting nickel-containing wastewater; (2) performing sedimentation and press filtration on nickel in the nickel-containing wastewater, and smashing nickel mud to obtain nickel slurry; (3) dissolving the nickel slurry into acid; (4) filtering a nickel sulfate solution; (5) removing impurities from the nickel sulfate solution for purification, and performing secondary filtration; (6) performing vacuum evaporative concentration, crystallization, filtration and centrifugal drying on the nickel sulfate solution to obtain nickel sulfate crystals. The invention aims to provide the method and the equipment which can reduce the waste of nickel resources, reduce potential hazard of nickel to the natural environment and realize recycling of the nickel resources and are used for preparing the electroplating-grade nickel sulfate from the nickel-containing wastewater produced in the surface treatment process. The method and the equipment are used for treating the nickel-containing wastewater.

Description

technical field [0001] The invention relates to a method for preparing electroplating nickel sulfate, and more specifically, relates to a method for preparing electroplating-grade nickel sulfate by utilizing nickel-containing waste water produced in a surface treatment process. The present invention also relates to a special device applied to the above method. Background technique [0002] In the surface treatment process, electroplating nickel and electroless nickel are two surface treatment processes that are often used. Electroplating nickel mainly includes electroforming nickel, sub-nickel, semi-bright nickel, bright nickel, and pearl nickel. The nickel in these electroplating forms is mainly nickel sulfate and a certain amount of nickel chloride. There are two main types of chemical nickel: alkaline chemical nickel and acidic chemical nickel. The main components are nickel sulfate, reducing agent, complexing agent, stabilizer and so on. The nickel content in electropl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/10C02F9/10
Inventor 陈文衡谢文发刘婷
Owner MEIZHOU ENVIRONMENTAL EQUIP
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