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     · Because of the high cost of platinum, palladium, and gold (> 25 k€/kg), an economic and environmental challenge is their recycling from printed circuit boards that represent around 2% weight of

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     · There are two current industry standards for removing gold from electronic scraps. The first is pyrometallurgy, which burns the gold off using high temperatures.

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     · Renping Cao of South China University of Technology in China adopted calcine-leaching technology to recover gold, palladium and silver from the waste PCBs which contained in the mobile phones. The result showed that the recovery rate of gold,

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     · Recycling components is good for the environment too. Recycling doesn’t just reduce waste, but also reduces the need to make even more new components. For example, a circuit board from your old phone could be used in another device, saving valuable resources that would have been wasted on making a new one.

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     · And with an estimated 24 mg of gold per mobile device, over 100,000 ounces of gold could be recovered from the 129 million disposed in 2009 according to US EPA statistics (only 8% of

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     · Mostly, the essential steps in hydrometallurgical treatment consist of leaching, purification, and recovery. Leaching treatments of waste printed circuit board can be sorted into four categories acid, ammonia, ammonium salt, and chloride other ways of leaching and some of these methods are industrially applied [24, 25].

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     · Developing a cost-effective and environmental friendly recycling system requires identifying and quantifying valuable materials and hazardous substances to understand the physical characteristics of this waste and enhance metal recovery to conserve natural resources and provide an environmentally sustainable solution to the management of waste product (Cui and Forssberg 2003 Zeng et al. 2017

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     · Recently, awareness has been raised concerning the need to decrease the total environmental footprint throughout the life cycle of a medicine, including the packaging materials. Aluminum, a highly energy-intensive metal, is widely used in blister packages together with polymers. However, these blister packages suffer from poor recyclability, with the clear majority of waste blister

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     · "The environmental effects of current practices can be devastating," said Foley. Foley used the city of Guiyu, China, considered the e-waste capital of the world, as an example.

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     · According to a study by Toxics Link, five tonnes of e-waste, which would come from 183 old models of discarded computers, can give Rs 178,308 as profit. The math is simple taking a conservative estimate, the total value of recoverable metals from 183 computers would be Rs 288,108. Logistics for collection of the waste would be about Rs 600.

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     · While dealing with the growing volume of E-wastes, recycling of printed circuit boards (PCBs) is known as one of the most difficult tasks considering their complex structure and the consequent complicated blend of materials [].PCBs are fundamental constituent materials in an extensive variety of electrical and electronic hardware (televisions, personal computers, mobile phones, and laptops).

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