The Dissolution Mechanism of Gold in Ammoniacal Solutions

金在氨溶液中的溶解机理

• 批准号: 9303841
• 负责人: Kenneth Han
• 金额: $ 14.5万
• 依托单位: South Dakota School of Mines and Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-03-15 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9303841&HistoricalAwards=false
• 关键词: Dissolution; Mechanism; Gold; Ammoniacal; Solutions

9303841 Han This is an examination of an alternative approach to the extraction of precious metals from refractory ores; the approach is intended to pose a much lesser threat to environmental quality than the presently predominant cyanide leaching process. The dissolution mechanism of gold in ammoniacal solution at elevated temperature and pressure is studied. Unique features of the approach include use of relatively high temperature and pressure in an autoclave, use of oxygen to regenerate the copper or cobalt oxidant, and measurement of electrochemical potentials at high temperature in an autoclave modified for this purpose. The oxidation of sulfide in ammoniacal solution is also investigated. If fully successful, this effort should result in a process that would pose a much lesser environmental problem than current technology, and would also permit extraction of gold (and maybe silver) from ores presently considered refractory.

小行星9303841 这是一种从难熔矿石中提取贵金属的替代方法的研究;这种方法对环境质量的威胁比目前占主导地位的氰化物浸出工艺要小得多。 研究了金在高温高压氨性溶液中的溶解机理。 该方法的独特特征包括在高压釜中使用相对高的温度和压力，使用氧气来再生铜或钴氧化剂，以及在为此目的而修改的高压釜中测量高温下的电化学电势。 本文还研究了硫化物在氨性溶液中的氧化。 如果完全成功，这一努力将导致一个过程，将构成一个小得多的环境问题比目前的技术，也将允许提取黄金（也许银）从矿石目前被认为是难处理的。