An Overview of Research on Au &amp; Ag Recovery in Copper Smelter

Shi, Yijun; Ye, Zhonglin

doi:10.1002/9781118663448.ch33

Cited by 6 publications

(5 citation statements)

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“…extremely efficiently recovered, with L Cu/s > 10 4 , in the copper phase. Previous industrial results (Mackey et al, 1975;Shi and Ye, 2013;Kucha and Cichowska, 2001) for gold and experimental studies for gold and platinum group metals (PGMs) executed without the drop-quench technique and direct phase analyses (Shuva et al, 2017;Nishijima and Yamaguchi, 2014;Yamaguchi, 2010) show typically lower distribution coefficient values compared to ours. Exceptions that fit with our Pd, Pt and Au results are the previous studies (Chen et al, 2016;Sukhomlinov and Taskinen, 2017;Avarmaa et al, 2019) employing the same experimental technique with the sensitive LA-ICP-MS analytics.…”

Section: Discussioncontrasting

confidence: 40%

Urban mining of precious metals via oxidizing copper smelting

Avarmaa

Klemettinen

O’Brien

2019

Minerals Engineering

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Recycling of precious metals from end-of-life electronics is a key factor for sustainable and efficient raw material usage. Simultaneously with the depletion of natural ore resources, the urban mines are storing increasing amounts of valuable and, more importantly, rare metals. To fulfill the targets of sustainability and move towards circular economy, the liberation of these valuables from wastes back to production and use needs to be improved. This study investigates the recoveries and behavior of gold, silver, palladium and platinum in copper smelting conditions at 1300 °C and pO2=10 −5 -10 −7 atm. The investigated system includes a copper alloy with three different type of slags in silica saturation: pure iron silicate, iron silicate with 10 wt% alumina and iron silicate with 10 wt% alumina and 5 wt% lime, providing information on the influence of alumina and lime on precious metal recovery possibilities. A highly advanced equilibration-quenching technique, followed by EPMA and sensitive LA-ICP-MS analyses, has been adopted to execute the experiments. Results show that gold, platinum and palladium are recovered very efficiently in copper, as their distribution coefficients between copper and slag, L Cu/s , were greater than 10 4 under every experimental condition studied and with all slag compositions. Silver distributed 30-60 times more in copper phase than was lost to slag. The addition of alumina into the slag somewhat decreased the distribution coefficient of silver, whereas gold and palladium distribution coefficients were increased. Lime addition improved the recovery of every precious metal (Pt unclear) into the copper phase. The concentrations of platinum in the slags were mainly below the detection limit of the used LA-ICP-MS, providing a minimum distribution coefficient of 10 6 .

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Section: Discussioncontrasting

confidence: 40%

Urban mining of precious metals via oxidizing copper smelting

Avarmaa

Klemettinen

O’Brien

2019

Minerals Engineering

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Section: Resultsmentioning

confidence: 99%

“…In the copper smelting process, for instance, precious metals and impure metals, such as Pb, Bi, Sn, and As, are closely connected to copper loss in slag because those metals have a high solubility in molten copper. 39 Precious metals are wellknown recovered byproducts in copper smelters. 40 Gold in a copper concentrate is absorbed in copper matte during flash smelting, and then the gold is collected as a residue after electro-refining of the copper anode.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Massive Recycling of Waste Mobile Phones: Pyrolysis, Physical Treatment, and Pyrometallurgical Processing of Insoluble Residue

Park

Han

Park

2019

ACS Sustainable Chem. Eng.

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Waste mobile phones (WMP) consisting of a heterogeneous mixture of metal, plastic, glass, and ceramic materials have either disposal or recycling problems. Pyrolysis can prevent the release of dioxin because organic materials are decomposed during the heating process. This paper reports a three-step massive treatment of WMP by pyrolysis, physical treatment, and pyrometallurgical processing. The release of dioxin was significantly limited during pyrolysis. Miscellaneous solid parts after pyrolysis (= 488 kg/ton-WMP) were physically separated into char (= 181 kg/t-WMP), iron scrap (= 75 kg/t-WMP), printed circuit boards (PCBs = 121 kg/t-WMP), and insoluble residue (= 111 kg/t-WMP). Here, the smelting of insoluble residue was carefully investigated to simulate the recovery of precious metals (gold and silver) and critical metals (nickel and tin) in a molten state. The recovery rate of valuable elements was influenced by the terminal velocity of metallic particles in the liquid slag in association with slag viscosity and silicate structures. The comprehensive metal recovery system can produce substantial amounts of copper (82.7 kg), gold (0.1 kg), silver (0.3 kg), nickel (1.5 kg), and tin (3.3 kg) from the processing of 1000 kg of WMP.

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“…Increasing viscosity and density decreases the rate in which the anode slime falls to the bottom of the cell [4,5] and lowers the diffusion coefficient of cupric ion (DCu2+) [6]. Decreasing the falling rate of anode slime increases movement of the slime to other directions than downward [4,5]. If the anode slime ends up on the cathode, the impurities could entrap into coating [4].…”

mentioning

confidence: 99%

“…Viscosity and density are highly important physicochemical properties of copper electrolyte since they affect the purity of cathode copper and energy consumption [1,2] affecting the mass and heat transfer conditions in the cell [3]. Increasing viscosity and density decreases the rate in which the anode slime falls to the bottom of the cell [4,5] and lowers the diffusion coefficient of cupric ion (DCu2+) [6]. Decreasing the falling rate of anode slime increases movement of the slime to other directions than downward [4,5].…”

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confidence: 99%

Viscosity and density models for copper electrorefining electrolytes

et al. 2016

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Abstract. Viscosity and density are highly important physicochemical properties of copper electrolyte since they affect the purity of cathode copper and energy consumption [1,2] affecting the mass and heat transfer conditions in the cell [3]. Increasing viscosity and density decreases the rate in which the anode slime falls to the bottom of the cell [4,5] and lowers the diffusion coefficient of cupric ion (DCu2+) [6]. Decreasing the falling rate of anode slime increases movement of the slime to other directions than downward [4,5]. If the anode slime ends up on the cathode, the impurities could entrap into coating [4]. Due to that the aim is to keep the viscosity and density sufficiently low [4]. According to the studies of Price and Davenport [3], Subbaiah and Das [2], Devochkin et al. [7] as well as Jarjoura et al. [8] increasing the concentration of copper, nickel and sulfuric acid increases both viscosity and density, while temperature decreases these properties. In addition, Price and Davenport [1] researched the effect of impurities arsenic and iron as well as Subbaiah and Das [2] the effect of iron, manganese and cobalt. All of these researchers found that those impurities increased both viscosity and density. The density and kinematic viscosity of copper electrorefining electrolytes have not been extensively researched under electrorefining conditions. The kinematic viscosity is also an important factor in the equation defining DCu2+ using a rotating disc electrode technique [6]. The errors in the viscosity values cause significant error to DCu2+. Thus, this work introduces mathematical models for the density and kinematic viscosity. The kinematic viscosity of the test electrolytes was measured with a Ubbelohde capillary viscometer from Schott-Geräte GmbH and the density with a glass tube oscillator DMA 40 Digital Density Meter from Anton Paar K. G. The temperature (50, 60, 70 °C) and electrolyte composition were used as variables. The composition variables investigated were copper (40, 50, 60 g/dm 3 ), nickel (0, 10, 20 g/dm 3 ) and sulfuric acid (130, 145, 160 g/dm 3 ) in all models, and additionally the effect of arsenic acid for the viscosity was studied (0, 15, 30 g/dm 3 ). The electrolytes used in these tests were prepared from CuSO4•5H2O (99-100 %), NiSO4•7H2O (99-100 %), H2SO4 (95-97 %) and arsenic acid (containing As 151700 mg/dm 3 , Bi 6.2 mg/dm 3 , Se 0.07 mg/dm 3 , Te 18.6 mg/dm 3 , Ag 0.2 mg/dm 3 , Cu 4794 mg/dm 3 , Ni 1688 mg/dm 3 , Pb 28.62 mg/dm 3 and Sb 3954 mg/dm 3 ). The results were normalized using known water values for viscosity as well as water and air values for the density. Based on these results the models for density (ρ, g/cm 3 ) and kinematic viscosity (ν, mm 2 /s) were designed, refined and analyzed using modeling and design tool MODDE, Equation 1 for density and 2 for kinematic viscosity: a Corresponding author: taina.kalliomaki@aalto.fi , 010 (2016)

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An Overview of Research on Au & Ag Recovery in Copper Smelter

Cited by 6 publications

References 0 publications

Urban mining of precious metals via oxidizing copper smelting

Urban mining of precious metals via oxidizing copper smelting

Massive Recycling of Waste Mobile Phones: Pyrolysis, Physical Treatment, and Pyrometallurgical Processing of Insoluble Residue

Viscosity and density models for copper electrorefining electrolytes

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