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Method for high-efficiency separation of valuable metal ions in complex solution containing heavy metals

Inactive Publication Date: 2016-07-27
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional lime neutralization method or chemical precipitation method not only may lose a large amount of valuable metals in the waste residue, but also makes it difficult to realize the full reuse of wastewater

Method used

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  • Method for high-efficiency separation of valuable metal ions in complex solution containing heavy metals

Examples

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Effect test

Embodiment 1

[0022] Example 1 Efficient separation of heavy metal-containing solution

[0023] The heavy metal waste residue of a copper smelter in Zhejiang is leached with sulfuric acid. The leaching solution contains about 2g / L copper, 0.9g / L nickel, 16g / L zinc, 0.3g / L cadmium, 0.7g / L calcium and 8g magnesium. / L, the pH value is about 1.8. Adopt process of the present invention to process, flow process is as figure 1 As shown, unless otherwise specified, the comparison herein is the volume ratio of the organic phase to the aqueous phase, and the specific procedures are as follows:

[0024] (1) Add lime milk to the leaching solution to adjust the pH to about 5.4. The requirement of adding milk of lime to adjust the pH value in the method of the present invention is that the pH value of the solution should be as high as possible under the premise that the heavy metal ions in the solution do not undergo hydrolysis. Use grille and inclined plate sedimentation tanks for pretreatment to re...

Embodiment 2

[0032] Example 2 Efficient separation of heavy metal-containing solution

[0033] The leaching solution of purified slag from a zinc smelter in Zhejiang contains about 5g / L copper, about 0.3g / L nickel, about 0.8g / L cobalt, about 20g / L zinc, about 0.7g / L cadmium, and about 0.5g / L calcium. Magnesium is about 10g / L and the pH is about 1.0. Adopt process of the present invention to process, flow process is as figure 1 As shown, unless otherwise specified, the comparison herein is the volume ratio of the organic phase to the aqueous phase, and the specific procedures are as follows:

[0034] (1) Add lime milk to the leaching solution to adjust the pH to about 5.4. The requirement of adding milk of lime to adjust the pH value in the method of the present invention is that the pH value of the solution should be as high as possible under the premise that the heavy metal ions in the solution do not undergo hydrolysis. Use grille and inclined plate sedimentation tanks for pretreatmen...

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Abstract

The invention relates to a novel method for high-efficiency separation of valuable metal ions in a complex solution containing heavy metals. According to the method, a solution rich in heavy metal ions like copper, nickel, cobalt, zinc and cadmium ions and impurity metal ions like calcium and magnesium ions is subjected to cooperative extraction by a compound extraction agent composed of Versatic 10 and Mextral984H; an organic phase obtained after extraction is subjected to reverse extraction under different acidity conditions so as to separately obtain easily-separable reverse extract rich in zinc / cadmium, easily-separable reverse extract rich in nickel / cobalt and easily-separable reverse extract rich in copper, and raffinate only containing calcium / magnesium can be directly returned to the procedure of production of the solution containing heavy metals. The whole method realizes high-efficiency recovery of valuable metal ions in the solution and reuse of all the waste water, creates considerable economic income for enterprises and achieves the purpose of zero discharge.

Description

technical field [0001] The invention relates to a method for recovering valuable metals in wastewater containing multiple heavy metals, in particular to a new process for efficiently separating valuable metal ions copper, nickel / cobalt, zinc / cadmium and calcium / magnesium in complex heavy metal-containing solutions. Background technique [0002] Non-ferrous metal production process, smelting dust residue treatment or reuse process will produce a large amount of waste water or solution containing heavy metals. The traditional lime neutralization method or chemical precipitation method not only may lose a large amount of valuable metals in the waste residue, but also makes it difficult to realize the full reuse of wastewater. For example, in a production plant with an annual output of 100,000 tons of electrolytic zinc, the amount of electrolytic wastewater produced is about 30,000 to 50,000 t / a, which is generally limited by the zinc ion concentration, impurity concentration an...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
Inventor 黄松涛杨丽梅李岩徐政王巍邱胤轩纪仲光
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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