Maxim, Robert E (2006) Designing granules for abrasive cleaning (using high-shear granulation). PhD thesis, University of Sheffield.
Abstract
This work investigates the granulation of fine calcium carbonate powder to form microgranules
(less than lOOf.lll1). The influence offormulation and operating conditions on
granule properties was investigated. This work analyses experimental data using a
database approach to relate granulation conditions to granule properties, to fmd propertyto-property
relationships and to investigate the influence on the abrasion of Perspex. It
was found that the granulation was undertaken in an unstable regime dictated by the need
to produce small granules. As a result, it was not possible to achieve reproducibility in
making the granules. For the range of granules produced it was difficult to determine
variation in abrasiveness within the experimental errors, a detailed error analysis was
carried out. A theoretical relationship between strength and porosity is developed and the
factors influencing abrasive wear are investigated.
Two theoretical models are presented: 1) Impact Failure model and 2) Granule
Consolidation model. The impact failure model relates dynamic impact strength to static
strength, which enables the prediction of a failure distribution curve (how many particles
will fail per hundred impacts as a function of velocity). This is done using a "critical
normal impact velocity" determined from the properties of the granule, properties of the
impact surface and experimentally measured granule static strength. The granule
consolidation model allows the qualitative prediction of the rate and extent of
consolidation from granulation conditions. It models the compaction of a granule by
descnbing the packing of its primary particles within an imaginary internal granule.
Sphere packing is discussed with implications for determining the maximum packing of a
primary particle size distribution.
Metadata
Awarding institution: | University of Sheffield |
---|---|
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Chemical and Biological Engineering (Sheffield) |
Identification Number/EthosID: | uk.bl.ethos.434524 |
Depositing User: | EThOS Import Sheffield |
Date Deposited: | 01 Nov 2016 15:57 |
Last Modified: | 01 Nov 2016 15:57 |
Open Archives Initiative ID (OAI ID): | oai:etheses.whiterose.ac.uk:14898 |
Downloads
434524_Vol1.pdf
Filename: 434524_Vol1.pdf
Description: 434524_Vol1.pdf
434524_Vol2.pdf
Filename: 434524_Vol2.pdf
Description: 434524_Vol2.pdf
434524_disc/Acknowledgements.doc
Filename: 434524_disc/Acknowledgements.doc
Description: 434524_disc/Acknowledgements.doc
434524_disc/Appendices List.doc
Filename: 434524_disc/Appendices List.doc
Description: 434524_disc/Appendices List.doc
434524_disc/Appendix A - Full derivation of static strength to impact st.doc
Filename: 434524_disc/Appendix A - Full derivation of static strength to impact st.doc
Description: 434524_disc/Appendix A - Full derivation of static strength to impact st.doc
434524_disc/Appendix B - Crushing test graphs EDIT.xls
Filename: 434524_disc/Appendix B - Crushing test graphs EDIT.xls
Description: 434524_disc/Appendix B - Crushing test graphs EDIT.xls
434524_disc/Appendix C - Derivation of analysis of Binder content and pa.doc
Filename: 434524_disc/Appendix C - Derivation of analysis of Binder content and pa.doc
Description: 434524_disc/Appendix C - Derivation of analysis of Binder content and pa.doc
434524_disc/Appendix D - Abrasion Testing Report.doc
Filename: 434524_disc/Appendix D - Abrasion Testing Report.doc
Description: 434524_disc/Appendix D - Abrasion Testing Report.doc
434524_disc/Appendix E - Original drawings for abrasion rig.doc
Filename: 434524_disc/Appendix E - Original drawings for abrasion rig.doc
Description: 434524_disc/Appendix E - Original drawings for abrasion rig.doc
434524_disc/Appendix F - Binder content verification method.doc
Filename: 434524_disc/Appendix F - Binder content verification method.doc
Description: 434524_disc/Appendix F - Binder content verification method.doc
434524_disc/Appendix G - Database (results).mdb
Filename: 434524_disc/Appendix G - Database (results).mdb
Description: 434524_disc/Appendix G - Database (results).mdb
434524_disc/Appendix H - Plots from queries from results EDIT.ppt
Filename: 434524_disc/Appendix H - Plots from queries from results EDIT.ppt
Description: 434524_disc/Appendix H - Plots from queries from results EDIT.ppt
434524_disc/Appendix I - mercury porosimetry graphs.pdf
Filename: 434524_disc/Appendix I - mercury porosimetry graphs.pdf
Description: 434524_disc/Appendix I - mercury porosimetry graphs.pdf
434524_disc/Appendix J - Experiment table form database.xls
Filename: 434524_disc/Appendix J - Experiment table form database.xls
Description: 434524_disc/Appendix J - Experiment table form database.xls
434524_disc/Final thesis - abstract.doc
Filename: 434524_disc/Final thesis - abstract.doc
Description: 434524_disc/Final thesis - abstract.doc
434524_disc/PhD Research corrections.doc
Filename: 434524_disc/PhD Research corrections.doc
Description: 434524_disc/PhD Research corrections.doc
Export
Statistics
You do not need to contact us to get a copy of this thesis. Please use the 'Download' link(s) above to get a copy.
You can contact us about this thesis. If you need to make a general enquiry, please see the Contact us page.