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Delftibactin can remove gold from sludges containing seawater and calcium carbonate, and is also capable of retrieving gold from electronic waste. [9] [10] Biohydrometallurgy techniques using D. acidovorans improve recycling profitability and are sustainable alternatives to cyanide leaching. [11]
Gold extraction is the extraction of gold from dilute ores using a combination of chemical processes. Gold mining produces about 3600 tons annually, [1] and another 300 tons is produced from recycling. [2] Since the 20th century, gold has been principally extracted in a cyanide process by leaching the ore with cyanide solution.
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April 8, 2022 at 8:19 AM
Specifically, there are various reports that the city of Delhi contains several e-waste management sites that use concentrated hydrochloric and nitric acids to extract gold and copper. [39] Recycling of e-waste is a very lucrative business in India and dominated by informal actors.
Improper management of e-waste is resulting in a significant loss of scarce and valuable raw materials, such as gold, platinum, cobalt and rare earth elements. As much as 7% of the world's gold may currently be contained in e-waste, with 100 times more gold in a tonne of e-waste than in a tonne of gold ore. [100]
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