摘要
研究利用黑曲霉(Aspergillus niger)降低石英砂中杂质含量,提高其白度。采用不同培养基、培养状态以及培养时间来探讨黑曲霉对石英砂除杂效率的影响,用X荧光光谱仪(XRF)检测不同处理石英砂化学组成,扫描电子显微镜(SEM)观察石英砂微观形貌,原子吸收法测定培养基中阳离子浓度。结果表明,黑曲霉对石英砂除杂效果明显。试验最佳处理条件是:PDA液体培养基,28℃,120r/min震荡培养6d,铁杂质去除率可达62.7%,石英砂白度明显提高。就黑曲霉对石英砂除杂机理进行了综合分析,强调黑曲霉-矿物聚集体及其酸性微环境有助于石英砂中杂质的浸出。
This paper studied the leaching process by Apergillus niger for reducing the impurities contents in quartz sand and for improving the whiteness of quartz.The effects of A.niger on the impurity removal efficiency were studied by using different culture media,culture state and leaching time.XRF was used to determine the composition of quartz sands,SEM was used to observe mineral micro-morphology,and atomic absorption method was used to detect ion concentration in culture media.The results showed that the optimum leaching condition,under which iron removal rate reached 62.7 % and quartz sand whiteness improved obviously after the fungal treatment,was as follows：PDA liquid medium,28℃,120 r/min,and a leaching time of 6 days.The fungal-mineral aggregation and acidic micro-environment are responsible for improving the impurity removal from quartz by A.niger.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2014年第6期784-789,共6页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金项目(41173091)
青海银达矿业有限公司企业课题
关键词
黑曲霉
石英砂
除杂
生物淋滤
纯化
Aspergillus niger
quartz sand
impurity removal
bioleaching
purification
