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Resource recycling method for electroplating sludge with high copper and nickel content

A recovery method and nickel electroplating technology, applied in the field of high-content copper and nickel electroplating sludge recycling, can solve the problems of incomplete separation, low product purity, single electroplating sludge quality requirements, etc., to avoid co-precipitation and ensure The effect of purity

Inactive Publication Date: 2021-08-13
厦门晖鸿环境资源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above method has a single quality requirement for resourceful electroplating sludge, which is only suitable for electroplating sludge with relatively fixed copper and nickel contents. When the copper and nickel contents in the electroplating sludge are high, the separation is not complete and the production Problems such as low product purity

Method used

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  • Resource recycling method for electroplating sludge with high copper and nickel content

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Experimental program
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Embodiment 1

[0038] A method for recycling high-content copper and nickel electroplating sludge, comprising the following preparation steps:

[0039] S1. Substitution of metal copper with iron powder: take 0.2L filtrate, and add 0.1kg iron powder to filtrate 1, control the pH at 0.1, react for 2 hours, obtain insoluble solid and filtrate 2 respectively after filtration, wash the insoluble solid with water, desalt , obtain product copper after drying, wherein, the fineness of iron powder is 1000 μ m;

[0040] S2, sulfide removal: add sodium sulfide to the filtrate 2 until the pH is 1, and react for 0.5h;

[0041] S3. Iron and chromium removal by hydroxide method: add sodium hydroxide, adjust the pH to 5.0, react for 1.5 hours, and filter insoluble impurities to obtain filtrate 3;

[0042] S4. Process for preparing nickel hydroxide by hydroxide compound method: add sodium hydroxide to the filtrate 3, adjust the pH to 9.0, react for 0.5h, filter to obtain insoluble solid and filtrate 4, and ...

Embodiment 2

[0044] A method for recycling high-content copper and nickel electroplating sludge, comprising the following preparation steps:

[0045] S1. Substitution of metal copper with iron powder: take 0.2L filtrate, add 0.11kg iron powder to filtrate 1, control the pH at 0.2, react for 2 hours, obtain insoluble solid and filtrate 2 respectively after filtration, wash the insoluble solid with water, remove salt, Obtain product copper after drying, wherein, the fineness of iron powder is 830 μ m;

[0046] S2, sulfide removal: add sodium sulfide to the filtrate 2 until the pH is 1.2, and react for 0.5h;

[0047] S3. Iron and chromium removal by hydroxide method: add sodium hydroxide, adjust the pH to 5.2, react for 1.5 hours, and filter insoluble impurities to obtain filtrate 3;

[0048] S4. Nickel hydroxide production process by hydroxide compound method: add sodium hydroxide to the filtrate 3, adjust the pH to 9.2, react for 0.5h, filter to obtain insoluble solid and filtrate 4, and d...

Embodiment 3

[0050] S1. Substitution of metal copper with iron powder: take 0.2L filtrate, add 0.12kg iron powder to filtrate 1, control the pH at 0.3, react for 2 hours, obtain insoluble solid and filtrate 2 respectively after filtering, wash the insoluble solid with water, desalt, Obtain product copper after drying, wherein, the fineness of iron powder is 660 μ m;

[0051] S2, sulfide removal: add potassium sulfide to the filtrate 2 until the pH is 1.3, and react for 0.5h;

[0052] S3. Iron and chromium removal by hydroxide method: add potassium hydroxide, adjust the pH to 5.4, react for 1.5 hours, and filter insoluble impurities to obtain filtrate 3;

[0053] S4. Nickel hydroxide production process by hydroxide compound method: add potassium hydroxide to the filtrate 3, adjust the pH to 9.4, react for 0.5h, filter to obtain insoluble solid and filtrate 4, and dry the insoluble solid to obtain nickel hydroxide.

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Abstract

The invention particularly discloses a resource recycling method for electroplating sludge with high copper and nickel content. The resource recycling method for electroplating sludge with high copper and nickel content comprises the following preparation steps: S1, acid dissolving and leaching; S2, replacing metal copper with iron powder: adding the iron powder into a filtrate 1, controlling pH to be 0-0.5, after reacting for 2 hours, filtering to respectively obtain an insoluble solid and a filtrate 2, and washing the insoluble solid with water, desalting and airing to obtain a copper product; S3, impurity removal of sulfide; S4, removing iron and chromium by an oxidation and hydroxide method: after oxidation, adding hydroxide, adjusting pH to 5.0-6.0, reacting for 1.5 hours, and filtering insoluble impurities to obtain a filtrate 3; and S5, a process of preparing nickel hydroxide by using a hydroxide compound, namely adding hydroxide into the filtrate 3, adjusting pH to 9.0-10.0, reacting for 0.5 hour, filtering to obtain an insoluble solid, and drying the insoluble solid to obtain the nickel hydroxide. According to the resource recycling method for the electroplating sludge with the high copper and nickel content, the product copper and the product nickel hydroxide can be recycled, and the yield and the purity of the product copper and the nickel hydroxide are improved.

Description

technical field [0001] The application belongs to the technical field of metallurgy and chemical industry, and more specifically, it relates to a resource recovery method of high-content copper and nickel electroplating sludge. Background technique [0002] At present, the "National Hazardous Waste List" (2021 Edition) will be implemented on January 1, 2021. The revision of the "List" has added more links to the use of exemptions on the premise that environmental risks are controllable at the national level. , making the comprehensive utilization of hazardous waste more flexible and precise, and further promoting the utilization of hazardous waste. Electroplating sludge contains a large amount of chromium, copper, nickel and other ions, and has a huge potential pollution risk to the soil and water environment. It is included in the "National Edition of Hazardous Waste List", waste category HW17. Because the metal ions contained in it have the value of resource utilization, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B23/00C01G53/04
CPCC22B7/007C22B15/0091C22B23/0461C01G53/04Y02P10/20
Inventor 曾斌龙
Owner 厦门晖鸿环境资源科技有限公司
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