|
|
Genesis of new ultra-fine particles of milling stock in the course of the mill exposure.
Kejík, Pavel ; Pekař, Miloslav (referee) ; Svěrák, Tomáš (advisor)
This work deals with the study of limestone and corundum dry milling using attritor-type stirred mill in a batch mode. There were stearin and polyethylene glycol used as surfactants and spherical shaped steel grinding elements used for the experimental part of the work. The main idea was to examine behavior of the selected grinding stock type within a long-term grinding forces exposure in selected conditions of ultrafine dry milling leading up to the submicron area. Characterization of samples was performed by laser granulometry, X-ray powder diffraction analysis, flame atomic absorption spectroscopy, objective color determination and electrokinetic potential measurement. Experimetaly measured data implies that in all cases there was a re-agglomeration of the grinding stock particles occurring, although in different stages of the disintegration process and in mutually various degree. The analysis results denote that a larger erosion of the crystal structures with the associated increase of the amorphous phase in the submicron particle size took place in the grinding stock.
|
|
|
Milling activators use in the very fine powder material practice.
Borguľová, Eva ; Kejík, Pavel (referee) ; Svěrák, Tomáš (advisor)
This work deals with the study of clinker dry milling using ball mill with the sferical shaped steel grinding elements in it. Grinding aids are surface active substances, wich separate particles of milled substance and prevent their reaglomeration and can active the proces of the grinding.There will be used PEG, TEA and HEAas a surfactans. Characterization of samples will be performed by granulometry.
|
|
|
Genesis of new ultra-fine particles of milling stock in the course of the mill exposure.
Kejík, Pavel ; Pekař, Miloslav (referee) ; Svěrák, Tomáš (advisor)
This work deals with the study of limestone and corundum dry milling using attritor-type stirred mill in a batch mode. There were stearin and polyethylene glycol used as surfactants and spherical shaped steel grinding elements used for the experimental part of the work. The main idea was to examine behavior of the selected grinding stock type within a long-term grinding forces exposure in selected conditions of ultrafine dry milling leading up to the submicron area. Characterization of samples was performed by laser granulometry, X-ray powder diffraction analysis, flame atomic absorption spectroscopy, objective color determination and electrokinetic potential measurement. Experimetaly measured data implies that in all cases there was a re-agglomeration of the grinding stock particles occurring, although in different stages of the disintegration process and in mutually various degree. The analysis results denote that a larger erosion of the crystal structures with the associated increase of the amorphous phase in the submicron particle size took place in the grinding stock.
|
|
|
Milling activators use in the very fine powder material practice.
Borguľová, Eva ; Kejík, Pavel (referee) ; Svěrák, Tomáš (advisor)
This work deals with the study of clinker dry milling using ball mill with the sferical shaped steel grinding elements in it. Grinding aids are surface active substances, wich separate particles of milled substance and prevent their reaglomeration and can active the proces of the grinding.There will be used PEG, TEA and HEAas a surfactans. Characterization of samples will be performed by granulometry.
|
guest ::
