泰南提特缩物的生物溶解:微生物群落和溶液氧化还原潜力的影响
Shota Kondo1, Kaito Hayashi1, Idol Phann1
1Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka, Japan.
Frontiers in microbiology
|January 23, 2024
概括
这项研究表明,活性炭 (AC) 可以控制选择性铜 (Cu) 生物溶解的氧化还原潜力 (Eh),从矿中生物溶解,固定有毒 (As). 通过自然或AC实现的最佳Eh控制是有效回收Cu的关键.
科学领域:
- * 生物技术和环境科学
- * 水电金和矿物加工
背景情况:
- *泰南是日益重要的铜资源,但由于其折射性和有毒 (As) 溶解,其生物溶解带来了挑战.
- *选择性生物溶解铜 (Cu),同时固定As是Cu-As硫化物可持续加工的关键目标.
研究的目的:
- * 为了研究活性炭 (AC) 辅助生物溶解宁缩物的有效性.
- * 探索选择性 Cu 溶解和 As 固定化的溶液氧化还原电位 (Eh) 的控制.
- * 评估微生物群落组成对生物炼性能的影响.
主要方法:
- *使用带有和没有活性炭 (AC) 的混合微生物培养物进行瓶子和生物反应器生物化试验.
- * 监测溶液氧化还原潜力 (Eh) 和分析Cu和As溶解.
- *不同条件下的微生物群落主导地位的特征.
主要成果:
- *在初步测试中,AC添加有效抑制了高EH水平 (高达840mV),在0.01%AC时实现了70%的Cu溶解与As固定.
- *发现以650-700mV的Eh范围为目标是最适合最大限度地溶解Cu和固定As.
- *在生物反应器测试中,一个由Sb.主导的微生物群体 热硫氧化剂在自然情况下保持低Eh (~630 mV),导致~60%的Cu溶解和~15%的As溶解.
结论:
- * 氧化还原潜力 (Eh) 控制对于选择性地从矿中生物溶解铜至关重要,使得可以同时固定.
- * 可以通过人工添加活性炭或自然通过特定微生物联盟的统治来实现Eh控制,如Sb. 热硫氧化剂. 热硫氧化剂
- * 选择生物溶解策略时,应考虑在加工条件下发展的微生物群体,以实现最佳的铜回收和环境安全.
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