SUN Ru-qiu1,2, LIAN Bin3
1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, of Chinese Academy of Sciences, Guiyang 550002, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Jiangsu Engineering and Technology Research Center for Microbiology, College of Life Science, Nanjing Normal University, Nanjing 210023, China
Abstract: 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.
Keywords: Aspergillus niger quartz sand impurity removal bioleaching purification
*Corresponding Author, E-Mail: bin2368@vip.163.com
Bulletin of Mineralogy, Petrology and Geochemistry Vol. 33, No.6, 2014, page 784-789
