Recovery of Copper from Motor Scrap Utilizing Ammonia Leaching Technique. Stuidies on the selective recovery of copper and iron from motor scrap. (2nd Report).

Nigo, Satoru; Majima, Hiroshi; Hirato, Tetsuji; Awakura, Yasuhiro; Iwai, Masao

doi:10.2473/shigentosozai.109.337

Cited by 13 publications

(7 citation statements)

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Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6] Majima et al reported the selective leaching of copper from motor scraps using cupric ammine solutions. 1,2) Zhou et al studied the removal of copper from ferrous scrap by an ammonia leaching method. 3,4) In these studies, Cu(I) ions were obtained under an air or oxygen atmosphere as the reaction product, and then metallic copper would be electrowon from a sulfuric acid solution obtained by solvent extractionstripping.…”

Section: Introductionmentioning

confidence: 99%

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Copper Leaching Behavior from Waste Printed Circuit Board in Ammoniacal Alkaline Solution

2006

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A novel energy-saving hydrometallurgical recovery process for copper from electronic scrap employing the Cu(I)-ammine complex has been presented on the basis of a thermodynamic consideration. In order to experimentally explore the feasibility of the leaching stage in this process, the copper leaching behavior from a printed circuit board (PCB) in ammoniacal alkaline solutions has been investigated under a nitrogen atmosphere. Copper in PCB was oxidized by Cu(II) to form Cu(I)-ammine complex ions. The leaching reaction can be expressed as:The Cu(II)-ammine complex significantly enhanced the leaching rate, while the Cu(I)-ammine complex slightly depressed it. Crushing of the PCB effectively enhanced the leaching rate, because the exposed metallic copper area is increased by the crushing. The effect of temperature on the leaching rate was insignificant. Consequently, the feasibility of the leaching stage in the proposed copper recovery process has been experimentally confirmed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Copper Leaching Behavior from Waste Printed Circuit Board in Ammoniacal Alkaline Solution

2006

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“…PT-5050 is one of the Acorga products having the advantages of strong extraction, good stripping, and high selectivity for copper (Kirk-Othmer 1995;Majima et al 1993). Recovery of copper from hydrochloric acid solution and its transfer into H 2 SO 4 solution were reported using extractant mixtures such as trioctylamine-LIX 54 (Nigo et al 1993) and Alamine336-LIX 54 (Ritcey et al 1982;Kordosky 1992;Barakat and Mahmoud 1999).…”

Section: Overview Of Recovered Copper Values 137mentioning

confidence: 99%

“…Copper was recovered from a variety of solid wastes and other lean grade ores by ammonia leaching, solvent extraction with LIX 84, and electrowinning of metal from the stripped solution (Majima et al 1993;Nigo et al 1993). Ritcey et al (1982) studied the solvent extraction separation of copper and zinc from chloride liquors using Acorga P5300 for copper and TBP for zinc.…”

Section: Overview Of Recovered Copper Values 137mentioning

confidence: 99%

An Overview of Process Options and Behavioral Aspects of the Copper Values Recovered From the Copper Bleed Stream of a Copper Smelter Developed at the National Metallurgical Laboratory

Agrawal

Bagchi

Kumari

et al. 2009

Mineral Processing and Extractive Metallurgy Review

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In the present research, an effort has been made to prepare copper salt=powder from the copper bleed stream generated during the electrowinning of pure copper from the copper anode in a copper smelter. Various approaches have been opted for the complete recovery of copper values such as: evaporation-crystallization, electrolytic process, and direct hydrogen reduction. Physical and chemical properties of copper powder=salt produced from the large-scale experiments from actual plant and model solutions have been evaluated for P=M applications and compared with the standard properties. Thus, mixed crystal suitable for recycling back to the system as a makeup salt containing nickel in a tolerable range could be recovered by evaporation and crystallization of the bleed stream up, to 50%. Copper powder recovery by the electrolysis process at a current density of 700 A=m 2 was about 95%. Scanning electron microscope examination showed that the powder was dendritic in nature. On annealing, the purity of the copper powder was found to be 99.95%. The annealed powder had apparent density of 3.04 g=cc, hydrogen loss 0.72%, and acid insoluble as 0.27%. On compaction of <104-mm sized powder, the green density was found to be 8.7 g=cc. Similarly, the recovery of the copper powder obtained from the model copper solution by the hydrogen reduction process was found to be >99% and the annealed powder had an apparent density of 3.50 g=cc, flow rate 35.6 g=min, hydrogen loss 0.195%, purity 99.8%, and green density of 8.57 g=cc while the powder from the actual plant solution was found to have an apparent density of 3.49 g=cc, flow rate 46.0 g=min, hydrogen loss 0.598%, purity 99.4%, and green density 8.57 g=cc for the powder <100 mm in size. Thus, the properties of copper powder produced by hydrogen reduction and electrolytic route were compared and were found to be suitable for the P=M applications.

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“…On the other hand, a hydrometallurgical process has certain advantages such that it could be economically operated even on a small scale and that the capital cost is lower than that for the conventional smelting process. So far, some efforts have been made to develop hydrometallurgical recycling processes; [1][2][3][4] these processes, however, have a problem in that power consumption during the copper electrowinning is relatively high. Thus, it is necessary to reduce the power consumption during the electrowinning to make the process economical and comparable to the low market price for copper.…”

Section: Introductionmentioning

confidence: 99%

Influence of Electrolyte on an Energy-Saving Copper Recycling Process Using Ammoniacal Alkaline Solutions

et al. 2006

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In order to make the energy-saving copper recycling process more economical by reducing the power consumption during copper electrowinning, the influence of the bath composition on the saturated concentration of cuprous ion, the electric conductivity, the cathodic current efficiency and the power consumption were studied in an ammonia-ammonium chloride-cuprous/cupric ion solution. The saturated cuprous ion concentration increased with the ammonia and ammonium chloride concentrations. The electric conductivity of the solution increased in proportion to the ammonium chloride concentration, because ammonium chloride acts as a supporting electrolyte. When the ammonia concentration increased from 3 to 10 kmolÁm À3 or when the cuprous ion concentration increased from 0.5 to 2 kmolÁm À3 , the cathodic current efficiency decreased by 5-10% at a current density higher than 500 AÁm À2 . This results from an increase in the cupric ion concentration formed by the unavoidable oxidation and the disproportionation of cuprous ions. The low current efficiency, however, had little influence on the power consumption compared to the influence of the electric conductivity that was the dominant factor determining the power consumption. Actually, when the concentration of ammonium chloride increased from 2 to 4 kmolÁm À3 , because of its function of increasing the electric conductivity of the solution, the power consumption was reduced by half. Based on this study, a suitable bath composition for the energy-saving copper recycling process was determined to be 3-10 kmolÁm À3 ammonia, 4-5 kmolÁm À3 ammonium chloride and 1-2 kmolÁm À3 cuprous ions.

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Recovery of Copper from Motor Scrap Utilizing Ammonia Leaching Technique. Stuidies on the selective recovery of copper and iron from motor scrap. (2nd Report).

Cited by 13 publications

References 0 publications

Copper Leaching Behavior from Waste Printed Circuit Board in Ammoniacal Alkaline Solution

Copper Leaching Behavior from Waste Printed Circuit Board in Ammoniacal Alkaline Solution

An Overview of Process Options and Behavioral Aspects of the Copper Values Recovered From the Copper Bleed Stream of a Copper Smelter Developed at the National Metallurgical Laboratory

Influence of Electrolyte on an Energy-Saving Copper Recycling Process Using Ammoniacal Alkaline Solutions

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