A method for recycling electroplating sludge with high iron content and low copper and nickel content

A technology for electroplating sludge and iron content, which is applied in the direction of ferric sulfate and the improvement of process efficiency, and achieves the effects of mild process, simple process and wide application.

Active Publication Date: 2018-08-17
盛隆资源再生(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are relatively few reports on the separation and utilization of electroplating sludge that is mainly composed of iron and contains other metals.

Method used

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  • A method for recycling electroplating sludge with high iron content and low copper and nickel content
  • A method for recycling electroplating sludge with high iron content and low copper and nickel content
  • A method for recycling electroplating sludge with high iron content and low copper and nickel content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 400kg of electroplating sludge, slowly add sulfuric acid solution with a mass concentration of 20%, stir and dissolve for 1 hour, measure the end point pH of the leaching solution = 0.4, slowly add ammonia water to adjust the solution pH = 3, let it settle for 3 hours, press filter to obtain hydrogen Iron sludge and filtrate; iron hydroxide sludge is beaten and washed according to the solid-to-liquid ratio of 1:1.5, and washed for 2 hours each time. After the ferric hydroxide mud, 0.5 times of iron powder of the amount of iron in the solution is added thereto, stirred and filtered at room temperature to obtain ferrous sulfate solution, and the filtrate is concentrated, recrystallized, and centrifuged to finally obtain industrial-grade standard ferrous sulfate (purity 87.95 %); and the filtrate is added at normal temperature with 80% sulfuric acid to adjust the pH to 1, wherein iron powder is added twice, each addition is 1 to 1.5 times the amount of copper or nickel...

Embodiment 2

[0034] Take 600kg of electroplating sludge, slowly add sulfuric acid solution with a mass concentration of 20%, stir and dissolve for 2 hours, measure the end point pH of the leaching solution = 0.7, slowly add ammonia water to adjust the pH of the solution solution = 3.5, let it settle for 4 hours, press filter to obtain hydrogen oxide Iron sludge and filtrate; iron hydroxide sludge is beaten and washed at a solid-to-liquid ratio of 1:1.8, and washed for 2.5 hours each time. The beaten water after washing is reused until the electroplating sludge is dissolved, and the sulfuric acid solution with a mass concentration of 20% is used for dissolution Ferric hydroxide mud after washing, 0.8 times iron powder of the amount of iron in the solution is added therein, room temperature stirring and filtering obtain ferrous sulfate solution, filtrate concentration, recrystallization, centrifugation finally obtain and reach industrial grade standard ferrous sulfate (purity 91.25%); and the...

Embodiment 3

[0037] Take 800kg of electroplating sludge, slowly add sulfuric acid solution with a mass concentration of 20%, stir and dissolve for 3 hours, measure the end point pH of the leaching solution = 1, slowly add ammonia water to adjust the solution pH = 4, let it settle for 5 hours, press filter to obtain hydrogen Iron sludge and filtrate; iron hydroxide sludge is beaten and washed at a solid-to-liquid ratio of 1:2, and washed for 3 hours each time. After the ferric hydroxide mud, 1.0 times iron powder of the amount of iron in the solution is added thereto, stirred and filtered at room temperature to obtain ferrous sulfate solution, and the filtrate is concentrated, recrystallized, and centrifuged to finally obtain industrial-grade standard ferrous sulfate (purity 89.78 %); the filtrate is added at normal temperature with 80% sulfuric acid to adjust the pH to 2, wherein iron powder is added twice, each addition is 1 to 1.5 times of the amount of copper or nickel in the filtrate, f...

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Abstract

The invention discloses a recycling treatment method of electroplating sludge with high iron content and low copper-nickle content. The method comprises the following steps: (1) completely dissolving the electroplating sludge with a sulfuric acid solution, adding ammonia water to regulate pH to (3 to 4), stirring and filtering to obtain iron hydroxide sludge and a solution taking Cu<2+> and Ni<2+> as main components; (2) washing the iron hydroxide sludge with water and circulating water liquid to the step (1); (3) dissolving washed precipitants with the sulfuric acid solution, adding iron powder for carrying out reductive treatment, and filtering to obtain a ferrous sulfate solution, wherein the remaining iron powder can be recycled, and then carrying out distillation and concentration, re-crystallization and centrifugation on the solution to obtain a ferrous sulfate crystal; and (4) adding the iron powder into the copper-nickle solution in the step (1), and carrying out replacement and screening in sequence to obtain copper and nickel powder and a, and then mixing the solution taking Fe<2+> as a main component with the solution in the step (3) to obtain a mixed solution and carrying out concentration and crystallization on the mixed solution to prepare ferrous sulfate. The process disclosed by the invention is easy to control, and has the characteristics of ensuring recycling utilization rate of other low-content metals and scale production while iron resource utilization is realized at the same time.

Description

technical field [0001] The present application relates to the technical field of recovery and treatment of electroplating sludge, in particular to a method for recycling electroplating sludge with high content of iron and low content of copper and nickel. Background technique [0002] As the "final state" of electroplating wastewater after precipitation treatment, electroplating sludge contains heavy metals such as Cu, Ni, Zn, Cr, Fe, etc. The composition is very complex, and heavy metals are difficult to degrade. It has been included in the national hazardous waste list. These heavy metals in electroplating sludge are unstable, easy to accumulate, and easy to lose. If they are not properly treated, they will easily migrate under the influence of the external environment, causing secondary pollution, endangering the environment, and affecting human health. [0003] The main treatment methods of electroplating sludge include harmless disposal and resource utilization. From t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B23/00C01G49/14
CPCC01G49/14C01P2006/80C22B7/007C22B15/0071C22B15/0091C22B23/043C22B23/0469Y02P10/20
Inventor 方稳钊现花周欢欢胡单
Owner 盛隆资源再生(无锡)有限公司
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