Designing granules for abrasive cleaning (using high-shear granulation).

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

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434524_disc/Acknowledgements.doc

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434524_disc/Appendices List.doc

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434524_disc/Appendix A - Full derivation of static strength to impact st.doc

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434524_disc/Appendix B - Crushing test graphs EDIT.xls

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434524_disc/Appendix C - Derivation of analysis of Binder content and pa.doc

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434524_disc/Appendix D - Abrasion Testing Report.doc

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434524_disc/Appendix E - Original drawings for abrasion rig.doc

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434524_disc/Appendix F - Binder content verification method.doc

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434524_disc/Appendix G - Database (results).mdb

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434524_disc/Appendix H - Plots from queries from results EDIT.ppt

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434524_disc/Appendix I - mercury porosimetry graphs.pdf

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434524_disc/Appendix J - Experiment table form database.xls

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434524_disc/Final thesis - abstract.doc

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434524_disc/PhD Research corrections.doc

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CORE (COnnecting REpositories)

Designing granules for abrasive cleaning (using high-shear granulation).

Abstract

Metadata

Downloads

434524_Vol1.pdf

434524_Vol2.pdf

434524_disc/Acknowledgements.doc

434524_disc/Appendices List.doc

434524_disc/Appendix A - Full derivation of static strength to impact st.doc

434524_disc/Appendix B - Crushing test graphs EDIT.xls

434524_disc/Appendix C - Derivation of analysis of Binder content and pa.doc

434524_disc/Appendix D - Abrasion Testing Report.doc

434524_disc/Appendix E - Original drawings for abrasion rig.doc

434524_disc/Appendix F - Binder content verification method.doc

434524_disc/Appendix G - Database (results).mdb

434524_disc/Appendix H - Plots from queries from results EDIT.ppt

434524_disc/Appendix I - mercury porosimetry graphs.pdf

434524_disc/Appendix J - Experiment table form database.xls

434524_disc/Final thesis - abstract.doc

434524_disc/PhD Research corrections.doc

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