摘要
The effect of Phanerochaete chrysosporium on degradation and preg-robbing capacity of activated carbon,which was used as a substitute of carbonaceous matter in carbonaceous gold ores,was studied.After 14 d treatment with Phanerochaete chrysosporium,the degradation rate of activated carbon reached 27.59%.The XRD and FTIR analyses indicate that Phanerochaete chrysosporium can distort the micro-crystalline structure of activated carbon,increase the number of oxygen-containing groups and aliphatics and make the aromatic structures be oxidized and exfoliated.The gold-adsorption tests show that Phanerochaete chrysosporium can reduce the preg-robbing capacity of activated carbon by 12.88%.This indicates that Phanerochaete chrysosporium is an available microorganism,and it can be employed to reduce the preg-robbing capacity of carbonaceous matter and improve the gold leaching rate.The combined effect of passivation,alkalization and oxidation of biological enzymes-free radicals of Phanerochaete chrysosporium on carbonaceous matter was also discussed.
研究黄孢原毛平革菌(Phanerochaete chrysosporium)对碳质金矿中碳质物的替代物——活性炭的降解转化及劫金能力的影响。经Phanerochaetechrysosporium作用14d后,活性炭的降解率高达27.59%。XRD和FTIR分析表明,Phanerochaete chrysosporium可使活性炭的微晶结构发生一定的畸变;含氧官能团和脂族结构的含量增多,一些芳烃结构氧化脱落。金吸附性试验表明,经Phanerochaete chrysosporium作用后,活性炭的吸金能力明显降低,可达12.88%。这说明Phanerochaete chrysosporium在降解转化活性炭类碳质物及降低其劫金能力方面是一种有效的微生物,可用于处理碳质金矿中碳质物,以降低其劫金性,提高金浸出率。探讨了Phanerochaete chrysosporium对碳质物的联合作用机理(钝化机理、碱作用机理和生物酶-自由基作用机理)。
基金
Projects (51174062,51104036) supported by the National Natural Science Foundation of China
Project (2012AA061502) supported by the National Hi-tech Research and Development Program of China
Project (2012BAE06B05) supported by the National Science and Technology Support Program of China during the 12th Five-Year Plan Period
Projects (N120602006,N110302002,N110602005) supported by Fundamental Research Funds for the Central Universities of China
