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On-line sensors for measuring the total ball and charge level in tumbling mills
Includes bibliographical references.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2015
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| _version_ | 1867614315980259328 |
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| access_status_str | Open Access |
| author | Donkor, Sarpong Bismark |
| author2 | Mainza, Aubrey |
| author_browse | Donkor, Sarpong Bismark Mainza, Aubrey |
| author_facet | Mainza, Aubrey Donkor, Sarpong Bismark |
| author_sort | Donkor, Sarpong Bismark |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/13225 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:50:06.103Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Department of Chemical Engineering |
| publisherStr | Department of Chemical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/13225 On-line sensors for measuring the total ball and charge level in tumbling mills Donkor, Sarpong Bismark Mainza, Aubrey Chemical Engineering Includes bibliographical references. Tumbling mills are still the mostly used milling device in the mineral processing industry for both coarse and fine grinding applications. A number of factors affect the performance of tumbling mill. One of these factors is volumetric filling which is the volume of charge in the mill expressed as a fraction of the total volume available. The volumetric filling controls the mill throughput, power draw and product size. The common method of measuring volumetric filling is by taking in situ measurements when the mill is stationary. This method is disruptive to production due to the mill downtime involved. The use of on-line sensors for measuring the volumetric filling using acoustic, inductive proximity and conductive sensors are the new technologies attempting to monitor volumetric filling in situ. The methods are non-intrusive and low cost approach for direct monitoring of dynamic volumetric filling conditions in the tumbling mill. The dynamic volumetric filling was assumed to be directly related to static mill filling conditions. In this study, the volumetric filling was calculated from the toe and shoulder angles estimated by the CSIRO monitor (acoustic) and the Magotteaux Sensomag (inductive proximity and conductive) sensors. The CSIRO acoustic sensor was installed on a run-of-mine (RoM) ball mill at Angloplatinum UG2 Concentrator at Rustenburg, South Africa. The toe and shoulder angles were obtained from the surface vibration caused by the impact of the charge on the mill shell. The industrial scale experiments were performed at varied mill feed rate at constant ball load of 28%. In the pilot scale experiments, the Magotteaux ball mill at Frank Concentrator was equipped with a Sensomag sensor for measuring the toe and shoulder angles of the slurry and ball load based on the principle of conductance and induction, respectively. The mill was configured to operate as a RoM ball mill. The experiments were conducted at varying mill speeds (75%-85% critical speed), feed rate (1200-2800kg/hr) and ball loads (15-26%). The static mill filling was determined from physical measurements after crash stopping the mill. 2015-07-01T08:56:33Z 2015-07-01T08:56:33Z 2014 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/13225 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Donkor, Sarpong Bismark On-line sensors for measuring the total ball and charge level in tumbling mills |
| thesis_degree_str | Master's |
| title | On-line sensors for measuring the total ball and charge level in tumbling mills |
| title_full | On-line sensors for measuring the total ball and charge level in tumbling mills |
| title_fullStr | On-line sensors for measuring the total ball and charge level in tumbling mills |
| title_full_unstemmed | On-line sensors for measuring the total ball and charge level in tumbling mills |
| title_short | On-line sensors for measuring the total ball and charge level in tumbling mills |
| title_sort | on line sensors for measuring the total ball and charge level in tumbling mills |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/13225 |
| work_keys_str_mv | AT donkorsarpongbismark onlinesensorsformeasuringthetotalballandchargelevelintumblingmills |