[Angew. Chem. Int. Ed.] Environmentally Benign, Rapid and Selective Extraction of Gold from Ores and Waste Electronic Materials
writer：Chunlin Yue, Huaming Sun, Wen-Jing Liu, Binbin Guan, Xudong Deng, Xu Zhang, Peng Yang*
keywords：Gold recovery, Coordination complex, Electronic waste, Non-cyanide gold leaching, Selective extraction
source：期刊
specific source：Angew. Chem. Int. Ed.
Issue time：2017年
The extraction of gold from ores and electronic waste is an important topic worldwide, as this precious metal has immense value in a variety of fields. However, serious environmental pollution and high energy consumption due to the use of toxic oxidation reagents and harsh reaction conditions is a well-known problem in the gold industry. Herein, we report a new chemical method based on the combined use of N-bromosuccinimide (NBS) and pyridine (Py), which has a greatly decreased environmental impact and reagent cost, as well as mild reaction requirements. This method can directly leach Au(0) from gold ore and electronic waste to form Au(III) in water. The process is achieved in a yield of approximately 90% at room temperature and a nearly neutral pH. The minimum dose of NBS/Py is as low as 10 mM, which exhibits low toxicity towards mammalian cells and animals as well as aquatic creatures. The high leaching selectivity of Au over other metals during gold leaching is demonstrated, showing that this method has great potential for practical industrial application towards the sustainable refining of gold from ores and electronic waste.
Chunlin Yue, Huaming Sun, Wen-Jing Liu, Binbin Guan, Xudong Deng, Xu Zhang, Peng Yang*. Environmentally Benign, Rapid and Selective Extraction of Gold from Ores and Waste Electronic Materials. Angew. Chem. Int. Ed. 2017, DOI: 10.1002/anie.201703412; Angew. Chem. 2017, DOI: 10.1002/ange.201703412
(just Accepted Article, Selected as Hot Paper)