褐煤微生物对细粒煤的表面改性作用

研究开发作用力强、选择性好和无毒的药剂是当前细粒煤洗选研究的重要方向之一。研究采用传统微生物分离法,与模式菌株相对比,从褐煤中筛选到一株酵母菌株Y21,并研究了其对细粒煤的表面改性作用。菌落形态、生理生化特征和分子序列片段分析表明,菌株Y21为胶红酵母;菌株Y21处理前后煤样表面Zeta电位和接触角的变化表明,菌体Y21与细粒煤之间通过静电作用和疏水相互作用可有效吸附于细粒煤表面,从而改变了细粒煤的表面电位和润湿特性;当煤样A的pH值在3.0～4.0之间、煤样B的pH值在2.0～4.0之间时,两煤样接触角显著增大,菌株Y21的作用使得煤表面更加疏水,并在改变细粒煤表面特性的同时,实现了对其选择性浮选。

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.