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Copper recovery method

A recovery method and technology of copper nitrate, applied in the direction of instrument, optics, process efficiency improvement, etc., can solve the problems of low copper purity, high total nitrogen in waste liquid and difficult recycling, etc.

Active Publication Date: 2021-07-20
深圳市祺鑫环保科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of this application is to provide a copper recovery method aimed at solving the technical problems that the purity of copper recovered from copper nitrate waste liquid is low, and the total nitrogen of the waste liquid is high and difficult to recycle.

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Embodiment 1

[0058] A method for copper recovery from copper nitrate waste liquid, comprising the steps of:

[0059] Provide copper nitrate waste liquid sample, sample acidity (H + Equilibrium concentration) 2.0mol / L, copper ion concentration 48g / L. Add 54g of oxalic acid to 1L of the above copper nitrate waste liquid, stir for 30min, aerate for 2h, let it settle naturally for 6-8h, filter and dry the solid to obtain 92g of dry copper oxalate solid; the main component of the filtrate is nitric acid, of which The acidity is 3.2mol / L, and after adding 65% nitric acid, it can be returned to the production line for continued use. The above-mentioned dry copper oxalate solid is dissolved with ammonia water with a mass fraction of 10%, and the cuproammonia solution is obtained after the solid is completely dissolved. Add Mextral 984H extractant to the above cuproammonia solution, where the volume ratio O / W=3:1, at this time, the copper ions are transferred from the water phase to the oil phase...

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Abstract

The invention relates to the technical field of waste liquid recovery, in particular to a copper recovery method. The copper recovery method specifically comprises the following steps of providing copper nitrate waste liquid; adding oxalic acid into the copper nitrate waste liquid for mixing treatment, and then performing solid-liquid separation to obtain cupric oxalate solid and regenerated liquid; dissolving the cupric oxalate solid with ammonia water to obtain a copper ammonia solution; adding an oil phase extraction liquid into the copper ammonia solution for extraction treatment to obtain a copper-containing oil phase and an extracted water phase; adding an aqueous phase reverse extraction solution into the copper-containing oil phase for reverse extraction treatment to obtain a copper sulfate solution and a reverse-extracted aqueous phase; and performing electrolytic treatment on the copper sulfate solution to obtain copper. According to the copper recovery method, regeneration recycling can be achieved in the whole technological process, new pollutants are not prone to being generated, high-total-nitrogen waste water is not prone to being generated, the waste water treatment cost is low, electrolytic copper with extremely high purity can be recovered from the copper nitrate waste liquid, and therefore the copper recovery method has good application prospects.

Description

technical field [0001] The application belongs to the technical field of waste liquid recovery, and in particular relates to a copper recovery method. Background technique [0002] Due to the oxidation of the copper nitrate solution itself and its strong corrosion ability to copper, the electrolysis efficiency is extremely low in the process of directly electrolyzing the copper nitrate solution to recover copper, and improper operation will leak highly toxic reddish-brown nitrogen oxide gas. Therefore, Generally, direct electrolysis is not used to recover copper in the market. [0003] At present, the methods for recovering copper from copper nitrate waste liquid mainly include replacement method and neutralization precipitation method. The copper recovered by these methods has low purity, so the use value is low. At the same time, new pollution sources will be further generated, and a lot of manpower and material resources will be required in the follow-up. Waste liquid tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12C22B7/00C22B15/00
CPCC25C1/12C22B15/0084C22B15/0089C22B7/006Y02P10/20
Inventor 李再强张伟奇黄文涛梁民
Owner 深圳市祺鑫环保科技有限公司
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