Effect of lignite microorganism on surface modification of fine coal

Research and development non-toxic reagent with strong force and better selectivity is one of the current important research directions of fine coal preparation.By traditional microorganism separation method,a yeast designate Y21 was isolated from lignite and compared with model strains and studied its effect on surface modification of fine coal.Colony morphology,physiological and biochemical characteristics and some molecular sequence fragments show that the strain Y21 is rhodotorula mucilaginosa.The change of zeta potential and contact angle before and after treating by strain Y21 shows that the Y21 can be effectively adhered onto the fine coal surface through electrostatic and hydrophobic interactions,so that changed the surface electric level and wetting characteristics of fine coal.When the pH range is 3.0-4.0 for coal sample A and 2.0-4.0 for sample B,the contact angles were sharply increased and the more hydrophobic on fine coal surface by effect of Y21 strain,which changed the surface characteristics of fine coal,thus realized the selective flotation.