Sequential pretreatment of double refractory gold ore (DRGO) with a thermophilic iron oxidizing archeaon and fungal crude enzymes
Sequential pretreatment of double refractory gold ore (DRGO) with a thermophilic iron oxidizing archeaon and fungal crude enzymes
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DOI：
10.1016/j.mineng.2019.04.043
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发表时间：
2019-07
影响因子：
4.8
通讯作者：
Kojo T. Konadu;R. Huddy;S. Harrison;K. Osseo-Asare;K. Osseo-Asare;K. Sasaki
中科院分区：
文献类型：
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作者：
Kojo T. Konadu;R. Huddy;S. Harrison;K. Osseo-Asare;K. Osseo-Asare;K. Sasaki
用嗜热古生菌Acidianus brierleyi对双难处理金矿进行了硫化物氧化处理，然后利用白腐菌黄孢原毛平革菌的无细胞废液(CFSM)分解含碳物质。并对其进行了预处理。使金的回收率从25%提高到77%。此外，CFSM中的粗木质素降解酶将含碳物质转化为更容易降解的物质，通过碱洗将其去除，最终黄金回收率为92%。差热分析和扫描电子显微镜对矿物的定量评价证实了这些矿物学变化。结果表明，硫化物生物氧化后，金颗粒主要被释放出来，在CFSM处理过程中，粘土矿物、金颗粒和部分分解的碳质物质作为粘结剂聚集在一起，形成了大颗粒的碳质铝硅酸盐。
Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeonAcidianus brierleyiand then to decompose carbonaceous matters using the cell-free spent medium (CFSM) from white-rot fungusPhanerochaete chrysosporium. The pretreatment byA. brierleyisignificantly improved the gold recovery from 25% to 77%. Additionally, the crude lignin-degrading enzymes in the CFSM converted the carbonaceous matters into more easily degradable substances, which were removed by alkaline washing, leading to a final gold recovery of 92%. These mineralogical alterations were confirmed by differential thermogravimetric analysis and quantitative evaluation of minerals with scanning electron microscopy. Based on the results, gold grains were mostly liberated after bio-oxidation of sulfides, and in following CFSM treatment, large particles of carbonaceous aluminosilicate were formed from the aggregation of clay minerals, gold grains and with partially decomposed carbonaceous matters acting as binders.