Abstract
ABSTRACTThe amphoteric characteristics of some metal oxides complemented by their chemical microstructures form the basis for their use for environmental engineering applications, e.g., alumina as catalyst and abrasive agents. This paper describes the microstructural properties and grinding behavior of γ-Al2O3 and coal particles in a batch impact mill. By grinding γ-Al2O3 and Hunan coal separately in an impact mill, a grinding process model of two dimensionless groups and is developed using Buckingham Pi theorem to obtain the desired particle morphologies. The properties established in this grinding model as key determinants of the grinding behavior are particle hardness, particle density and milling speed. The milling results confirm that γ-Al2O3 of the HBW 5/100 hardness 247 show higher resistance to grinding than coal of HBW hardness 28, because the final ground particle diameters d0.9 after 30 min milling were 136.6 and 33.4 µm for γ-Al2O3 and coal, respectively. This grinding model is pioneering as the particle hardness contained in the dimensionless group embodies an intrinsic material property which controls grinding and is confirmed to be in agreement with the fragmentation pattern.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
