Glass microspheres-enhanced bioleaching of low grade lepidolite using Aspergillus niger
Using Aspergillus niger as the leaching strain,different diameters and concentrations of glass microspheres were added to leach low-grade lithium mica,and the mechanism by which glass microspheres enhancing fungal leaching was studied. The highest leaching rate T1-40 was compared with the lowest leaching rate T5-60. The results show that small glass microspheres can increase the biomass of Aspergillus niger,promote organic acid secretion,and cause mechanical damage to the ore,thereby enhancing lithium leaching. The lithium leaching rate of the bacterial control group after 30 d is 2.53％,while the lithium leaching rate after adding glass microspheres reaches 3.19％,which increases the leaching rate by 26％. The mass fraction of oxalic acid,citric acid,and gluconic acid in T1-40 increases by 62％,11％,and 25％,respectively,while the citric acid content in T5-60 decreases by 34％. The glass microspheres physically impact the surface of the ore,resulting in mechanical damage. Glass microspheres enhance the damage of Aspergillus niger to mineral structures. Metal ion bonds break under the action of organic acids. This study helps to understand the interaction between macroscopic particles and Aspergillus niger,as well as the influence of glass microspheres on the leaching of low-grade lithium ore.
万方数据
维普
