Surface Modification Effects Of Microorganisms On Coal And The Application Flotation

For the purpose of this paper, surface modification of microbial adhesion on coal surface and coal bio-flotation effects were researched. Bacteria Xanthomonas hortorum which was newly separated from fat coal, lignite-source Yeast Rhodotorula mucilaginosa and a in-depth studied actinomyce in bio-mineral processing Mycobacterium phlei were chosen as research objects. First, the adhesion of three different kinds of microorganisms on raw coal surface were through researched; respective studies of bio-adhesion of typical coal gangue minerals and flotation tailing were performed, the changes of ξ potential and contact angel of minerals after microbial treatment proved that microbes had different surface modification abilities to minerals, their adhesion on coal surface were selective and stronger than others, the adhesion enlarged ξ potential and contact angel of coal suface and was able to improve the selectivity in flotation process. Infrared spectrum analysis, scanning electron microscope test and adsorption isotherm equation simulation as well as DLVO theory were used to analyze the mechanism. Based on their remarkable surface modification abilities, microorganisms were used as bio-reagents in coal flotation; the effects of different coal types and particle size distributions were compared. According to their high efficiency, good selectivity, remarkable effects for fine particle and nontoxic properties, further research and application of microbial flotation reagents are feasible.