Objective of this work was to develop a novel method for characterizing real 3D shapes of particles smaller than 20μm by X-ray microtomography(X-RMT).Multidimensional separation of heterogenous solids through agglome...Objective of this work was to develop a novel method for characterizing real 3D shapes of particles smaller than 20μm by X-ray microtomography(X-RMT).Multidimensional separation of heterogenous solids through agglomeration in suspension will improve recycling processes as the particle shape and the agglomerate size are used for shape-selective separation.In the present paper we discuss the fundamentals of X-ray tomography and the experimental setup for selective spherical agglomeration in suspension.A specific preparation method of the particulate sample for X-RMT followed by 3D image processing,are essential for the shape analysis expressed as sphericity.We also discuss the limitation of this method due to the so-called Partial Volume Effect and particle clusters in the order of magnitude of X-RMT resolution.As proof of concept,we used a mixture of graphite platelets and spheronized graphite particles for a shape selective-agglomeration in suspension.The remaining fines were analyzed and showed more platelets than in the mixture.This indicates that spheronized particles are preferably bound in the agglomerates.These findings show that,based on the discussed sample preparation and a 3D image analysis in connection with X-RMT,particle shapes of micronized particles can be discriminated.展开更多
This paper deals with the preparatiou of ultra-clean coals by selective oil agglomeration. It has been found that the deashing method used has high deashing rate and high combustible recovery but low oil consumption. ...This paper deals with the preparatiou of ultra-clean coals by selective oil agglomeration. It has been found that the deashing method used has high deashing rate and high combustible recovery but low oil consumption. So it will be widely used in the future. The ash content of coal 1# and 2# is reduced to less than 1%. It has been summarized that the main factors affecting deashing are coal rank, oil consumption, pulp density as well as particle size.展开更多
基金financially supported by the German Research Foundation(DFG),Priority Program 2045(SPP2045).
文摘Objective of this work was to develop a novel method for characterizing real 3D shapes of particles smaller than 20μm by X-ray microtomography(X-RMT).Multidimensional separation of heterogenous solids through agglomeration in suspension will improve recycling processes as the particle shape and the agglomerate size are used for shape-selective separation.In the present paper we discuss the fundamentals of X-ray tomography and the experimental setup for selective spherical agglomeration in suspension.A specific preparation method of the particulate sample for X-RMT followed by 3D image processing,are essential for the shape analysis expressed as sphericity.We also discuss the limitation of this method due to the so-called Partial Volume Effect and particle clusters in the order of magnitude of X-RMT resolution.As proof of concept,we used a mixture of graphite platelets and spheronized graphite particles for a shape selective-agglomeration in suspension.The remaining fines were analyzed and showed more platelets than in the mixture.This indicates that spheronized particles are preferably bound in the agglomerates.These findings show that,based on the discussed sample preparation and a 3D image analysis in connection with X-RMT,particle shapes of micronized particles can be discriminated.
文摘This paper deals with the preparatiou of ultra-clean coals by selective oil agglomeration. It has been found that the deashing method used has high deashing rate and high combustible recovery but low oil consumption. So it will be widely used in the future. The ash content of coal 1# and 2# is reduced to less than 1%. It has been summarized that the main factors affecting deashing are coal rank, oil consumption, pulp density as well as particle size.
