Surface Modification Effects of Microorganism from Lignite on Fine Coal

Abstract:

One of the important directions of the research on coal washing is developing the non-toxic reagents with strong force and high selectivity. Compared with model strains, yeast designated Y21 as surface modifier for fine coal was isolated from lignite by traditional microorganism separation. Colony morphology, physiological and biochemical characteristics and some molecular sequence fragments show that the strain Y21 was Rhodotorula mucilaginosa. Through zeta-potential measurements and contact angle changes of coal samples caused by strain Y21, it was shown that strain Y21 can be selectively adhered onto the fine coal surface through the electrostatic interactions and the hydrophobic interactions. These observations lead to the conclusion that the adhesion of the yeast onto the coal surface could change zeta potential and the contact angle of coal particles. For both coal samples, the contact angle was sharply increased respectively in the pH range 3-4 and 2-4 as a result of Y21 strain adsorption. This indicates that as a result Y21 strain adsorption the coal surfaces have become more hydrophobic. These results indicated that the modified flotation and flocculation rate of fine coal particles were improved using the strain Y21 through changing the surface characteristics of coal.

• Periodical: Advanced Materials Research (Volume 868)
• Pages: 423-428
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.868.423
• Online since: December 2013
• Authors: Yu Chen, Li Yan Wang, Shu Quan Zhu
• Keywords: Bioflocculation, Bioflotation, CoAl, Microorganism, Surface Modification

References

[1] Tao Youjun, Liu Qian, Daniel TAO, et al. Enhancing efficiency of fine coal flotation by picobubbles[J]. Journal of China University of Mining & Technology, 2009, 38(6): 820-823.

[2] ZHU Shu-quan, JIANG Lin-hua, ZHOU Li-zhuang. Synthesis and application of flocculants for treatment of ultra-fine coal slurry [J]. Journal of China University of Mining & Technology, 2009, 38(4): 534-539.

[3] Kong Xiaohong, Kang Wenze. Study on effect of reagent mixtures in flotation of coal fines [J]. Guangzhou Chemical Industry, 2011, 39(6): 50-52.

[4] LIAO Yinfei, AN Manyan, XIA Wencheng. Research on kerosene emulsifier as collector in fine coal flotation [J]. Clean Coal Technology, 2010, 16(2): 17-19.

[5] ZHAO Kui-xia, ZHU Shu-quan, ZHAO Hua-zhang, et al. Media polymers species characteristics of polyaluminum silicate chloride [J]. Journal of China University of Mining & Technology, 2006, 35(1): 109-113.

[6] Zheng Yan, Ye Zhilong, Fang Xuliang, et al. Production and characteristics of a bioflocculant produced by Bacillus sp. F19 [J]. Bioresource Technology, 2008, 99: 7686-7691.

DOI: 10.1016/j.biortech.2008.01.068

[7] Ross W. Smith, Mauno Miettinen. Microorganisms in flotation and flocculation: Future technology or laboratory curiosity [J]. Minerals Engineering, 2006, 19: 548-553.

DOI: 10.1016/j.mineng.2005.09.007

[8] Wang Lan, Tang Jing, Zhao Xuan. Methods of researching flocculating mechanism of microbial flocculants[J]. Chinese Journal of Environmental Engineering, 2011, 5(3): 481-488.

[9] S.P. Vijayalakshmi, A.M. Rsichur. The utility of Bacillus subtilis as a bioflocculant for fine coal[J]. Colloids and Surfaces B: Biointerfaces, 2003, 29: 265-275.

DOI: 10.1016/s0927-7765(03)00005-5

[10] E. Amini, T.R. Hosseini, M. Oliazadeh, and M. Kolahdoozan. Application of Acidithiobacillus Ferrooxidans in coal flotation[J]. International Journal of Coal Preparation and Utilization, 2009, 29: 279-288.

DOI: 10.1080/19392690903558314

[11] A.M. Raichur, M. Misra, K. Bukka, R.W. Smith. Flocculation and flotation of coal by adhesion of hydrophobic Mycobacterium phlei[J]. Colloids and Surfaces B: Biointerfaces, 1996, 8: 13-24.

DOI: 10.1016/s0927-7765(96)01312-4

[12] Zhang Dongchen, Zhang Mingxu, Chen Qingru, et al. Study on Mycobacterium phlei selective flocculate coal to get rid of pyretic sulphur [J]. Journal of China Coal Society, 2004, 29(5): 585-589.

[13] Schneider, I.A.H., Misra. M., Smith, R.W. Bioflocculation of hematite suspensions with products from yeast cell rupture [J]. Development in Chemical Engineering and Mineral Processing 4, 1994: 248-252.

DOI: 10.1002/apj.5500020407

[14] Zhang Jizhong. Microbial taxonomy [M]. Shanghai: Fudan University Press, (1990).

[15] Barnett, J.A. Yeasts: Characteristics and Identification [M]. Qingdao: Qingdao Ocean University Press, (1991).