Leaching of Chalcopyrite in Acidified Nitrate Using Seawater-Based Media

Minerals

卷:8

MaríaE. Taboada¹  PíaC. Hernández¹  TeófiloA. Graber¹  OsvaldoO. Herreros²  Yousef Ghorbani³ 

[1] Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Avda. Angamos 601, Antofagasta 1270300, Chile;

[2] Departamento de Ingeniería en Minas, Universidad de Antofagasta, Avda. Angamos 601, Antofagasta 1270300, Chile;

[3] School of Natural and Built Environment, Faculty of Science, Engineering and Computing, Kingston University, London KT1 2EE, UK;

关键词: nitrate;    chalcopyrite;    chloride;    leaching;    seawater;   

DOI  :  10.3390/min8060238

来源: DOAJ

【 摘 要 】

The leaching of copper from industrial copper ore with 4.8 wt % chalcopyrite by acidified nitrate with seawater based media was investigated. Water quality (pure water and seawater), temperature (25–70 °C), reagent concentration, and nitrate type (sodium and potassium) were studied variables. Leaching conditions were: 100 g ore/1 L solution; P80 of 62.5 µm; 400 rpm and leaching time, varying between 3 and 7 days. Nitrates in sulfuric acid are known to be good oxidants for sulfide ores. This study showed that up to 80 wt % copper could be extracted at 45 °C in 7 days. In the absence of nitrate, under the same leaching conditions, only a 28 wt % copper extraction was achievable. The extraction rate increased to 97.2 wt % when leach temperature was increased to 70 °C in nitrate-chloride-acid media. The presence of chloride ions also increased the copper extraction rate. The copper extraction achieved in seawater systems were higher than in water systems under the same leaching conditions (increased by an average of 18 wt %). This effect can be attributable to the contribution of chloride that increases proton (H+) activity.

【 授权许可】

Unknown