Process development for recovery of copper and precious metals from waste printed circuit boards with emphasize on palladium and gold leaching and precipitation.
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...[11] A....
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...2 billion annually worldwide) is considerable [11]....
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References
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"Process development for recovery of..." refers background in this paper
...Incineration of WEEE during pyrometallurgical processing of WEEE releases some hazardous gases that it causes severe environmental problems (Huang et al., 2009)....
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...Large volumes of waste electric and electronic equipment (WEEE) are generated worldwide annually and WEEE is the fastest growing waste stream in the modern world (Huang et al., 2009)....
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461 citations
"Process development for recovery of..." refers background in this paper
...Over the last century, cyanide leaching has been widely used to recover gold from gold minerals and also secondary sources because of its highly efficiency and relatively low cost (Syed, 2012)....
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...Thiosulfate is a good candidate for replacement of cyanide for gold extraction, since it generally causes fewer environmental impacts and thiosulfate leaching exhibits less interference from foreign cations (Syed, 2012)....
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243 citations
"Process development for recovery of..." refers background or methods or result in this paper
...This is agreement with the results previously found by Birloaga et al. (2013)....
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...The leaching of PCB using a mineral acid in the presence of a suitable oxidant is usually applied as the first step in recycling of metals from PCB after mechanical pretreatments, size reduction in particular (Yang et al., 2011; Birloaga et al., 2013)....
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...%) there is in PCB that its recovery is economically important and also the presence of copper has a negative effect on the subsequent leaching steps (Wang and Gaustad, 2012; Birloaga et al., 2013)....
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..., 2011; Birloaga et al., 2013). Although some base metals leach during this step, but the main objective of this step is leaching of copper, since a high amount of copper (i.e., around 20 wt.%) there is in PCB that its recovery is economically important and also the presence of copper has a negative effect on the subsequent leaching steps (Wang and Gaustad, 2012; Birloaga et al., 2013). Oh et al. (2003) proposed sulfuric...
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...After removing copper and some other base metals from PCB during the first leaching stage, the next step is usually leaching of gold and silver (Birloaga et al., 2013)....
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216 citations
"Process development for recovery of..." refers background or methods in this paper
...Furthermore, management of the highly acidic wastewaters is very difficult (Jing-ying et al., 2012)....
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...Aqua regia has the highest gold dissolution rate among different leaching agents, but it is applied usually in the laboratory scale because of aqua regia’s strongoxidation and high-corrosion to the equipment (Jing-ying et al., 2012)....
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...The main drawback of this method is production of a huge amount of cyanide contaminated wastewaters, which can lead to a serious damage to people and the environment, so this method is gradually replaced by the other methods (Jing-ying et al., 2012)....
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...Acidic thiourea is the best choice for leaching of gold and silver from PCB due to a rapid reaction with gold and low-price, as well as less environmental impact comparing with cyanide (Jing-ying et al., 2012)....
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...1 (Jing-ying et al., 2012):...
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