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标题：Can I borrow your broken gold necklace for my chemistry lab?
本地全文：下载
作者：Omar Gómez-Belli ; Sara Angélica Cortes-Llamas ; Leticia Lozada-Rodríguez 等
期刊名称：Anales del Instituto de Investigaciones Estéticas
印刷版ISSN：0185-1276
电子版ISSN：1870-3062
出版年度：2019
卷号：30
期号：2
页码：70-77
DOI：10.22201/fq.18708404e.2019.2.67501
出版社：Instituto de Investigaciones Estéticas
摘要：A laboratory experiment on the recovery of gold from an obsolete piece of jewelry was developed. The gold leaching system consists of K 3 [Fe(CN) 6 ] (potassium ferricyanide), NaCl (sodium chloride), O 2 (oxygen) and NaOH (sodium hydroxide); K 3 [Fe(CN) 6 ] acts as a nontoxic source of cyanide, as well as an oxidizing agent (along with oxygen). Dicyanoaurate ([Au(CN) 2 ]-) obtained in this process is isolated and characterized by spectroscopic methods. Due to the relative simplicity of this operation and the low toxicity of the reagents required, it can be performed in any educational laboratory. This experiment gives students practice with leaching processes, which are of great importance in the mining industry.
关键词：Enseñanza Experimental; Química Inorgánica; Metalurgia