Change search
ReferencesLink to record
Permanent link

Direct link
Development of a geometallurgical testing framework for ore grinding and liberation properties
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering. (Minerals and Metallurgical Engineering)
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Efficient measurement methods for comminution properties are an important prerequisite for testing the variability of an ore deposit within the geometallurgical context. This involves the investigation of effects of mineralogy and mineral texture on the breakage of mineral particles. Breakage properties of mineral particles are crucial for the liberations of minerals and the energy required for that.

For process optimization and control purposes, comminution indices are often used to map the variation of processing properties of an entire ore body (e.g. Bond work index). Within the geometallurgical approach this information is then taken up when modelling the process with varying feed properties.

The main focus of this thesis work has been to develop a comprehensive geometallurgical testing framework, the Geometallurgical Comminution Test (GCT), which allows the time and cost efficient measurement of grinding indices and their linkage to mineralogical parameters (e.g. modal mineralogy or mineral texture, mineral liberation).

In this context a small-scale grindability test has been developed that allows estimating the Bond work index from single pass grinding tests using small amounts of sample material. Verification of the evaluation method and validation was done with different mineral systems.

For selected samples the mineral liberation distribution was investigated using automated mineralogy. By transferring the energy-size reduction relation to energy – liberation relation new term liberability has been established.

As part of the experimental investigations, mineralogical parameters and mineral texture information were used for predicting breakage and liberation properties. Patterns for describing the breakage phenomena were established for a set of iron oxide ore samples. The determined breakage patterns indicated that the specific rate of mineral breakage slows down when reaching the grain size of mineral particles, thus allowing maximizing mineral liberation significantly without wasting mechanical energy.

Place, publisher, year, edition, pages
Luleå University of Technology: Luleå University of Technology, 2016.
Keyword [en]
Grindability test, mineral texture, breakage properties, mineral liberation, process modeling, geometallurgy
National Category
Other Engineering and Technologies
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-59904ISBN: 978-91-7583-737-6ISBN: 978-91-7583-738-3 (pdf)OAI: oai:DiVA.org:ltu-59904DiVA: diva2:1039474
Public defence
2016-12-15, D770, LTU, Luleå, 10:00 (English)
Opponent
Supervisors
Projects
CAMM
Available from: 2016-10-27 Created: 2016-10-24 Last updated: 2016-11-28Bibliographically approved

Open Access in DiVA

fulltext(3912 kB)16 downloads
File information
File name FULLTEXT01.pdfFile size 3912 kBChecksum SHA-512
4f426f803718f6160dbee64b7e4631b3ef55cd9201d04c8f11de7454ff6b6d2341bd76e5ca9d7b1ef3741bd4891c96a23708dce47d231eaaf16a1d66a1bf924d
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Mwanga, Abdul-Rahaman
By organisation
Department of Civil, Environmental and Natural Resources Engineering
Other Engineering and Technologies

Search outside of DiVA

GoogleGoogle Scholar
Total: 16 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 201 hits
ReferencesLink to record
Permanent link

Direct link