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Method for recovering copper and nickel nitrate by electrolysis of electroplating waste water

A technology for electroplating wastewater and electrolysis recovery is applied in the field of preparation technology of copper and nickel nitrate, which can solve the problems of cumbersome process and high extraction cost, and achieve the effects of simple and convenient process, low recovery cost, good economic benefits and social benefits

Inactive Publication Date: 2006-07-19
赵小毛
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is also a process for sulfuric acid extraction to form copper sulfate crystals and nickel sulfate crystals in China, but its raw materials must be the precipitated sodium hydroxide and nickel sludge after the electroplating wastewater has been treated, add sulfuric acid, use brass iron vanadium to remove iron, and filter , using the method of extraction and back extraction to separate copper sulfate and nickel crystals. The disadvantages of this method are: 1. The raw material is precipitated metal sludge, and the electroplating wastewater must be treated by chemical methods or electroplating wastewater to obtain raw materials; 2. Extraction High cost and cumbersome process

Method used

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  • Method for recovering copper and nickel nitrate by electrolysis of electroplating waste water
  • Method for recovering copper and nickel nitrate by electrolysis of electroplating waste water

Examples

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Embodiment 1

[0022] see figure 1 In this embodiment, sodium hydroxide is added to the electroplating wastewater containing at least one of sulfuric acid and hydrochloric acid, and through a chemical reaction, its pH value reaches 6-8, that is, the amount of sodium hydroxide added to achieve the pH requirement is At this time, all kinds of metals in the wastewater are precipitated, and the wastewater can be discharged if it reaches the standard; of course, it is best to have a pH value of 7, because at this time the pH is just neutral, that is, the acid-base content of the wastewater is just neutralized.

[0023] Then, mix the precipitated metal with the electroplating wastewater containing nitric acid, and all the metals are dissolved in the nitric acid wastewater. At this time, the pH value is controlled between 1-3, preferably between 2-2.5, and then directly electrolyzed. The current intensity is controlled between 150-200 amperes, so that the copper is completely precipitated during th...

Embodiment 2

[0028] see figure 2 , in this embodiment, the first two steps are the same as in Embodiment 1, and will not be repeated.

[0029] After the electrolytic copper is obtained by electrolysis, since the nitric acid liquid containing metal also contains iron, nickel hydroxide is added, and the pH value is 4-5, preferably 4-4.5, and then heated. The heating temperature is controlled between 95°C-98°C, preferably 97°C. After that, potassium permanganate needs to be added to make the iron in the solution precipitate together with chromium, manganese and other metals. It should be noted that the amount of potassium permanganate added is generally determined according to the weight of iron in the solution. If there is 0.1-0.2 kg of iron in the solution, 0.5 kg of potassium permanganate needs to be added. To increase or decrease the weight, the amount of potassium permanganate added needs to be increased or decreased in proportion.

[0030] Finally, the precipitated iron, chromium, ma...

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Abstract

The electrolysis recovery method for Cu and Ni(NO3)3 from electroplating sewage comprises: adding NaOH into the sewage with at least H2SO4 or HCl to adjust pH till technical request and deposit metal; mixing the sewage contained metal and HNO3; with proper pH value, electrolyzing and controlling current to separate Cu; adding Ni(OH)3 into the liquid without Cu; with proper pH value, heating to deposit; filtering the precipitate, and obtaining the Ni(NO3)3 solution; heating and condensing to obtain the Ni(NO3)3 crystal. This invention is simple and low cost.

Description

technical field [0001] The invention relates to a preparation process of copper and nickel nitrate, in particular to a method for recovering copper and nickel nitrate by electrolysis of electroplating wastewater. Background technique [0002] Electroplating wastewater contains heavy metals such as copper, nickel, and chromium, as well as different types of hydrochloric acid, sulfuric acid, and nitric acid. At present, there is also a process for sulfuric acid extraction to form copper sulfate crystals and nickel sulfate crystals in China, but its raw materials must be the precipitated sodium hydroxide and nickel sludge after the electroplating wastewater has been treated, add sulfuric acid, use brass iron vanadium to remove iron, and filter , using the method of extraction and back extraction to separate copper sulfate and nickel crystals. The disadvantages of this method are: 1. The raw material is precipitated metal sludge, and the electroplating wastewater must be treated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D21/18C25C1/12C01G53/00C02F1/461C02F1/62C02F103/16
CPCY02P10/20
Inventor 赵小毛
Owner 赵小毛
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