Harena Resources, listed in London, confirmed that metallurgical testing results have demonstrated the effectiveness of using low environmental impact heap leaching processes such as saltwater or standard ammonium sulfate solution to efficiently recover rare earth elements from its 75% owned Ampasindava project in Madagascar.
The company stated that under low acidic conditions, simple ion desorption was achieved using ammonium sulfate leach solution, resulting in high extraction rates.
Testing conducted by SGS Lakefield using an ammonium sulfate solution with a pH of 5 achieved recovery rates of 87% neodymium, 88% praseodymium, 71% dysprosium, 75% terbium, and 63% yttrium.
The optimal column heap leaching test conducted within 218 hours showed that using an ammonium sulfate solution with a pH of 4 could achieve recovery rates of 88% neodymium, 86% praseodymium, 73% dysprosium, 79% terbium, and 67% yttrium. It is worth noting that the recovery rate of the low-value cerium element is low, which is beneficial for producing high-grade magnet rare earth concentrate or rare earth carbonate.
The company stated that under low acidic conditions, simple ion desorption was achieved using ammonium sulfate leach solution, resulting in high extraction rates.
Testing conducted by SGS Lakefield using an ammonium sulfate solution with a pH of 5 achieved recovery rates of 87% neodymium, 88% praseodymium, 71% dysprosium, 75% terbium, and 63% yttrium.
The optimal column heap leaching test conducted within 218 hours showed that using an ammonium sulfate solution with a pH of 4 could achieve recovery rates of 88% neodymium, 86% praseodymium, 73% dysprosium, 79% terbium, and 67% yttrium. It is worth noting that the recovery rate of the low-value cerium element is low, which is beneficial for producing high-grade magnet rare earth concentrate or rare earth carbonate.
来源：上海有色金属网 分享
点击排行
今日有色
微信扫一扫关注
掌上有色
掌上有色下载
返回顶部
- 掌上有色下载
- 微信关注
