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The use of enzymes in improving the quality of a food product

Key words:

enzyme, lipase, food industry, sustainable development, quality.

Summary
Noble metals have been used in electric and electronic industries due to their excellent
electrical conductivity, low contact electrical resistance and corrosion resistance, even though
rare earths have started partially replacing precious metals in electronic industry. Therefore, a
large number of e-waste contains significant amount of precious metals, particularly gold,
silver, and palladium. It is of importance to recycle precious metals from e-waste. For
instance, the gold content in waste printed circuit boards is 35-50 times higher than gold ore.
Extraction of noble metals from waste electronic and electrical equipment (WEEE), including
leaching, purification and recovery, is the second stage after the recovery of base metals. The most common leaching reagents for precious metal leaching include cyanide, thiourea and
thiosulfate because of the stable metal complex formed.
This paper presents a review of various solutions using for noble metals leaching from
wastes or ores.

dr inż. Anna CIESZYŃSKA
Poznan University of Economics and Business
Faculty of Commodity Science
Department of Technology and Instrumental Analysis
al. Niepodległości 10, 61-875 Poznań, Poland
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Additional information