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Method for separating copper, chromium and zinc in acid leaching solution

A separation method and solution technology, applied in the direction of improving process efficiency, etc., can solve the problems of unfavorable chromium harmless disposal, efficient recovery and resource utilization, unsatisfactory separation effect of large-scale application, and no large-scale industrial application, etc. Ideal separation effect, low cost and significant economic benefits

Inactive Publication Date: 2013-04-03
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] There are not many research results on the efficient separation of copper, chromium, and zinc under acidic conditions, and the separation effect of large-scale application is not satisfactory. There is a lack of economical and applicable technology to support industrial application, and there is no report on large-scale industrial application.
This is also one of the technical problems that have been plagued by the recycling of secondary resources such as copper, chromium and zinc electroplating sludge, which is not conducive to the harmless disposal of chromium and the efficient recovery and resource utilization of valuable components metal copper, chromium and zinc

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  • Method for separating copper, chromium and zinc in acid leaching solution

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Embodiment 1

[0026] After the electroplating sludge containing copper, chromium and zinc is leached by sulfuric acid, the content of Cu in the solution is 4.5g / L, the content of Cr is 5.0g / L, the content of Zn is 3.4g / L, and the pH value of the solution is 0.5. 20% (v / v) LIX984N was used as the extractant to extract copper, kerosene was used as the diluent, compared with O / A=1, the stirring time was 5 minutes at room temperature, and two-stage extraction was carried out. The organic phase uses sulfuric acid with a concentration of 10g / L as the detergent, compared with O / A=2, and the stirring time is 5min at room temperature for primary washing. After washing, the loaded organic phase uses sulfuric acid with a concentration of 180g / L as the stripping agent. Compared with O / A=1, the stirring time at room temperature is 5min, and the primary stripping is carried out. The stripping liquid obtains copper sulfate, and the separation of copper is first realized. extract. The copper content in th...

Embodiment 2

[0029] After the electroplating sludge containing copper, chromium and zinc is leached with sulfuric acid, the Cu content in the solution is 12g / L, the Cr content is 8.5g / L, the Zn content is 7g / L, and the pH value of the solution is 0.5. 30% (v / v) LIX984N was used as the extractant to extract copper, kerosene was used as the diluent, compared with O / A=1, the stirring time was 5 minutes at room temperature, and three-stage extraction was carried out. The organic phase uses sulfuric acid with a concentration of 10g / L as the detergent, compared with O / A=2, and the stirring time is 10min at room temperature for primary washing. After washing, the loaded organic phase uses sulfuric acid with a concentration of 200g / L as the stripping agent. Compared with O / A=1, the stirring time at room temperature is 5min, and a primary stripping is carried out. The stripping solution obtains copper sulfate, and the separation of copper is first realized. extract. The copper content in the raffi...

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Abstract

The invention provides a method for separating copper, chromium and zinc in an acid leaching liquid, and particularly relates to a method for separating copper, chromium and zinc in an acid leaching liquid containing electroplating sludge of copper, chromium and zinc components. The process sequentially comprises the following steps: (1) adding an extracting agent into an acid leaching liquid to extract copper, wherein the copper in an organic phase is separated and extracted through the back extraction of sulfuric acid; (2) deoiling the residual phase after extraction, regulating the pH value of the solution, and adding soluble phosphate to perform phosphoric acid chromium precipitation reaction; and (3) filtering, and separating to obtain a chromium phosphate / chromium hydroxide composite precipitate and a zinc-containing filtrate, thus realizing the selective separation of chromium and zinc. According to the method for separating copper, chromium and zinc in an acid leaching liquid, based on the characteristics that phosphates are different in solubility and chromium phosphate and chromium hydroxide can form a composite coprecipitate, optimization and control technologies such as extraction, chemical precipitation and the like are used to solve the problem on the separation and extraction of a high-content copper / chromium / zinc mixed solution in an acidic solution.

Description

technical field [0001] A method for separating copper, chromium and zinc in an acid leaching solution, which relates to the extraction and separation of acid leaching solutions containing copper, chromium and zinc in hydrometallurgical processes, especially in the acid leaching solution of electroplating sludge containing copper, chromium and zinc components Copper, chromium, zinc separation method. Background technique [0002] There have been many studies on the extraction and separation of copper and zinc, and there are many applications. Common separation methods include extraction separation (P204 extraction of zinc or M5640, LIX984, N902 extraction of copper), sulfide precipitation separation, and concentrated alkali separation. , and zinc powder purification method. [0003] At present, the metal separation methods in the acidic mixed solution containing copper, chromium and zinc include: step-by-step neutralization precipitation method; extraction and separation of ...

Claims

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Application Information

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IPC IPC(8): C22B3/26C22B3/44C22B15/00C22B34/32
CPCY02P10/20
Inventor 王成彦袁文辉徐志峰月日辉揭晓武杨卜
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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