Interpreting low energy attrition behaviour in a pilot mill using numerical modelling

Weerasekara, Nirmal, Yahyaei, Mohsen and Powell, Malcolm (2014). Interpreting low energy attrition behaviour in a pilot mill using numerical modelling. In: Juan Yianatos, XXVIl International Mineral Processing Congress - IMPC 2014: Conference Proceedings. XXVII International Mineral Processing Congress - IMPC 2014, Santiago Chile, (117-124). 20-24 October 2014.

Attached Files (Some files may be inaccessible until you login with your UQ eSpace credentials)
Name Description MIMEType Size Downloads
Author Weerasekara, Nirmal
Yahyaei, Mohsen
Powell, Malcolm
Title of paper Interpreting low energy attrition behaviour in a pilot mill using numerical modelling
Conference name XXVII International Mineral Processing Congress - IMPC 2014
Conference location Santiago Chile
Conference dates 20-24 October 2014
Proceedings title XXVIl International Mineral Processing Congress - IMPC 2014: Conference Proceedings
Journal name IMPC 2014 - 27th International Mineral Processing Congress
Place of Publication Santiago, Chile
Publisher Gecamin Digital Publications
Publication Year 2014
Sub-type Fully published paper
Editor Juan Yianatos
Start page 117
End page 124
Total pages 8
Collection year 2015
Language eng
Abstract/Summary The conditions under which rocks become superficially damaged during the grinding process are not well understood. The main purpose of the work presented here is to understand how superficial breakage occurs under incremental low-energy impacts. To enable this study a series of abrasion tests with multisize pilot mills have been performed. Outcomes of numerical simulation corresponding to each test were examined to investigate the experimental results. Abrasion tests have been conducted using three grinding mill sizes (i.e. 1.8, 1.2, and 0.8 m). Two types of ore were used to investigate different hardness strengths. To ensure abrasion was the dominant mechanism, in all tests the mill speed was reduced to 40% of critical speed. The relationship between the Fractional mass loss rate and particle size was investigated by randomly collecting seven tracer particles from sizes -73+63, -53+45, and -37.5+31.5 mm. It was evident from the results that the Fractional mass loss rate of angular particles declines as the particle size increases whereas the Fractional mass loss rate decreases from fine to coarse in rounded particles. Results of Discrete Element Method (DEM) simulations indicate that fine particles experience higher levels of collision energy per particle and this value reduces as the particle size increases and mill size reduces. This explains the higher Fractional mass loss rate of smaller particles as well as the increase in the Fractional mass loss rate as the mill size increases. Linked DEM and experimental data indicates that under these test conditions surface damage attrition is the dominant mechanism. This work suggests that DEM simulation can be implemented to predict the abrasion wear of particles in mills.
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
Versions
Version Filter Type
Citation counts: Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Tue, 18 Nov 2014, 01:52:56 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre