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Influence of pebble mill operating conditions on measurements with an in-mill sensor
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.ORCID iD: 0000-0002-8032-9388
LKAB.
2011 (English)In: Minerals & metallurgical processing, ISSN 0747-9182, Vol. 28, no 4, p. 193-197Article in journal (Refereed) Published
Abstract [en]

Autogenous grinding is a process of reducing the particle size distribution of an extracted ore by using the ore itself as the grinding media. It is a process that is difficult to control and there is a lack of knowledge of the events occurring inside the mill. To find out more about how the mill behaves under different processing conditions, a full factorial test was performed with iron ore in a pilot-scale pebble mill at the LKAB R&D facility in Malmberget. To complement this work, a strain gauge detector was embedded in one of the mill’s rubber lifters, the Metso Minerals continuous charge measurement (CCM) system, and was used to get more information about the charge dynamics. The data from the experiments has been analyzed. For production purposes, an increase in the number of particles smaller than 45 μm can be regarded as a probable increase in the production rate. The analysis shows that there will be an increase in fines at 65% of critical speed, especially when the mill is 45% full. This setting will also increase the power consumption, but improves the grindability of the ore even more. The deflection of the lifters is smaller for lower critical speeds. A higher degree of filling also gives a smaller toe angle and a higher shoulder angle as expected.

Place, publisher, year, edition, pages
2011. Vol. 28, no 4, p. 193-197
Keywords [en]
Comminution, Autogenous grinding, Pebble mill, Process optimization, Chemical engineering - Metallurgical process and manufacturing engineering
Keywords [sv]
Kemiteknik - Metallurgisk process- och produktionsteknik
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-13969Local ID: d49b7294-4f40-4d38-a290-4c5c6906bb35OAI: oai:DiVA.org:ltu-13969DiVA, id: diva2:986922
Note

Validerad; 2011; 20111028 (palle)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-09-12Bibliographically approved

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http://www.smenet.org/minerals-and-metallurgical-processing-journal/201111/issue.cfm

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Alatalo, JohannaPålsson, Bertil

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