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A method for preparing high-purity copper by electrowinning of scrap copper

A technology of high-purity copper and waste miscellaneous copper, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of large consumption of ethylenediamine and failure to reduce power consumption, and achieve smooth surface, environmental friendliness, and deposition Uniform and dense effect

Active Publication Date: 2016-06-08
广东省工业技术研究院(广州有色金属研究院) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process uses a large amount of ethylenediamine, and the electrowinning process still adopts the process of first reducing divalent copper to monovalent copper, then reducing monovalent copper to metallic copper, and the power consumption has not been reduced.

Method used

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  • A method for preparing high-purity copper by electrowinning of scrap copper
  • A method for preparing high-purity copper by electrowinning of scrap copper
  • A method for preparing high-purity copper by electrowinning of scrap copper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of scrap miscellaneous copper, its chemical composition is as shown in table 1:

[0025] Table 1 The main chemical composition of scrap copper (%)

[0026] chemical composition Cu Zn Fe sn Bi Si Ag Pb As content 78.0 6.1 0.8 5.3 0.4 3.0 0.1 3.0 1.5

[0027]1) Dissolved copper: Weigh waste miscellaneous copper and place it in the reactor, add CuCl with a copper content of 80g / L 2 -NH 3 -NH 4 Cl solution, pH=10.0, dissolved at 30°C for 10 hours, filtered to obtain a filtrate with a copper content of 145g / L and a pH=9.4;

[0028] 2) Vacuum extraction: According to volume ratio = 30:20:48:2, add extractant kelex100, isooctyl alcohol, sulfonated kerosene and co-extractant P to the above filtrate 204 , ratio (O / W)=1:1, vacuum degree 0.02MPa, extraction time 60min, the extracted organic phase is re-extracted with hydrochloric acid to separate zinc, iron, nickel and other impurities, and then recycled, according to NH 3 -...

Embodiment 2

[0033] Scrap copper is identical with embodiment 1.

[0034] 1) Dissolving copper: Weigh waste miscellaneous copper and place it in the reactor, add CuCl with a copper content of 90g / L 2 -NH 3 -NH 4 Cl solution, pH=10.0, dissolved at 35°C for 10 hours, filtered to obtain a filtrate with a copper content of 165g / L and a pH=9.3;

[0035] 2) Vacuum extraction: According to volume ratio = 35:15:48.5:1.5, add extractant kelex100, isooctyl alcohol, sulfonated kerosene and co-extractant P to the above filtrate 204 , ratio (O / W)=1:2, vacuum degree 0.05MPa, extraction time 60min, the extracted organic phase is re-extracted with hydrochloric acid to separate impurities such as zinc, iron, nickel, and then recycled, according to NH 3 -NH 4 The volume ratio of Cl solution to raffinate is 5.6:1, with 350ml NH 3 / L and 35g / LNH 4 Cl NH 3 -NH 4 The Cl solution dilutes the raffinate so that the copper content is 25g / L and the pH is 9.80, and the raffinate enters the electrolytic cell a...

Embodiment 3

[0040] A kind of miscellaneous copper waste, its chemical composition is as shown in table 4.

[0041] Table 4 The main chemical composition (%) of scrap copper.

[0042] chemical composition Cu Zn Fe sn Bi Si Ag Pb As content 81.0 6.5 0.5 3.8 0.4 2.8 0.1 2.5 1.0

[0043] 1) Dissolved copper: Weigh waste miscellaneous copper and place it in the reactor, add CuCl with a copper content of 100g / L 2 -NH 3 -NH 4 Cl solution, pH=10.0, dissolved at 30°C for 10 hours, filtered to obtain a filtrate with a copper content of 172g / L and a pH=9.5;

[0044] 2) Vacuum extraction: According to volume ratio = 25:15:58:2, add extractant kelex100, isooctyl alcohol, sulfonated kerosene and co-extractant P to the above filtrate 204 , ratio (O / W)=1:1, vacuum degree 0.04MPa, extraction time 60min, the extracted organic phase is re-extracted with hydrochloric acid to separate impurities such as zinc, iron, nickel, and then recycled, according to NH 3 ...

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Abstract

The invention discloses an electro-deposition method for preparing high-purity copper from scrap copper. The method is characterized by comprising the following steps: putting the scrap copper in a copper-containing CuCl2-NH3-NH4Cl solution, and performing dissolution and filtration to obtain a filtrate; adding an extraction agent kelex100, isooctyl alcohol, sulfonated kerosene and a synergist P204; adjusting the copper content of a raffinate by using an NH3-NH4Cl solution; adding HEDP or ethylene diamine into the raffinate as an electrolyte; under the conditions that the current density is 220-250 A / m<2>, the cell voltage is 1.9-2.2 V and an anion exchange membrane is a diaphragm, performing electro-deposition for 24h to obtain electro-deposited copper on a cathode plate. The electro-deposition method for preparing the high-purity copper from the scrap copper is environmentally friendly, a weak alkaline system is adopted, and high-purity cathode copper which is uniformly and compactly deposited and is smooth in surface can be obtained. According to the method, the scrap copper can be efficiently dissolved, and green regeneration, energy saving and environmental protection can be realized. The high-purity copper of more than 4N can be prepared by using the method without limitation of copper content in raw materials of the scrap copper, and the method is applicable to regeneration of various types of scrap copper.

Description

technical field [0001] The invention relates to a method for preparing high-purity copper, in particular to a method for preparing high-purity copper by electrowinning waste miscellaneous copper. Background technique [0002] Waste miscellaneous copper includes waste automobile water tank copper strips, waste transformers, motors, old wires, cables, copper-containing machine parts, old copper roofs, pipes, etc., and can be divided into 1 according to the copper content. # Miscellaneous copper, purity 95%~99%, 2 # Miscellaneous copper, purity above 85% and except 1 # ,2 # Out of 3 # Waste miscellaneous copper, waste miscellaneous copper has different copper content due to its different sources, and also contains different types and contents of other metals, such as tin, lead, bismuth, silver, gold, etc. [0003] High-purity copper usually refers to metallic copper with a purity above 4N, while copper with a purity above 6N is called ultra-high-purity copper. High-purity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/40C22B7/00C25C1/12
CPCY02P10/20
Inventor 曹洪杨王继民周毅舟
Owner 广东省工业技术研究院(广州有色金属研究院)
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