In this study, several tests were examined to analyze the sortability of magnesium oxide (MgO) by the use of triboelectrostatic belt separation. The objective of the study is to find a dry sorting technique to separate MgO from accompanying components such as CaO and SiO2. The aim of this first series of experiments was to develop knowledge about the triboelectrostatic charging behaviour of magnesium oxide. All sorting tests were carried out by the use of a triboelectrostatic belt separator in lab scale in an air-conditioned room. Sortierung von kaustisch gebranntemMagnesit (Magnesiumoxid) mittels triboelektrostatischer Bandscheidung Zusammenfassung: Im Rahmen dieser Studie wurden mehrere Versuchsreihen durchgeführt, um die Sortierbarkeit von ofenfallendem Magnesiumoxid (MgO) unter Verwendung der triboelektrostatischen Bandscheidung zu analysieren. Ziel der Studie ist es, ein trockenes Sortierverfahren zu finden, um die Begleitkomponenten wie CaO und SiO2 des MgO-Produktes möglichst vollständig abzutrennen. Ziel dieser ersten Versuchsreihe war es, Erkenntnisse über das triboelektrostatische Aufladeverhalten der enthaltenen Mineralphasen zu gewinnen. Alle Sortierversuche wurden mit einem triboelektrostatischen Bandabscheider im Labormaßstab in einem klimatisierten Raum durchgeführt. Dipl.-Ing. S. Gehringer ( ) Chair of Mineral Processing, Department Mineral Resources Engineering,

In the course of this study, systematic test series were examined to analyse and optimise the sortability of raw magnesite by using triboelectrostatic belt separation. The objective of the study was to find a dry sorting process for the separation of raw magnesite from accompanying components such as other carbonates and silicates. The aim of this test series was to develop knowledge about the optimal operating parameters for the triboelectrostatic separation of raw magnesite. All sorting tests were carried out with a triboelectrostatic belt separator type "ST X2" in an air-conditioned room at the Chair of Mineral Processing,

In the course of this study, the applicability of electrostatic separation and flotation for processing a mineral sample rich in talc was examined. The aim was a comparison of those two separation processes and the concentrates obtained. Furthermore the separation behaviour of the silicates and carbonates was a goal of the examination. The electrostatic separation test work was conducted with a triboelectric belt separator. The feed, an artificially prepared mineral sample, was composed of four components: talc, quartz, dolomite, and magnesite. The lab scale test work was done exclusively at the Chair of Mineral Processing, Montanuniversitaet Leoben, Austria.

In the course of this study, several test series were carried out to investigate the triboelectrostatic charging behaviour of various oxides. At the beginning, the influence of the degree of aging and the influence of the sample storage on the charging efficiency of the oxide samples was analysed. For this purpose, two oxide samples were stored under different environmental conditions and then sorted using triboelectrostatic belt separation. Results of a previous series of tests showed that an increased feed temperature has a negative effect on the charging behaviour of calcium and magnesium oxide. Therefore, the effects of a reduced feed temperature were also examined. For these experiments, samples were stored at 8 °C under exclusion of air. In addition, a series of tests was carried out with a gradual increase of the voltage on the triboelectrostatic belt separator in order to determine possible differences in the charging efficiency of calcium oxide and magnesium oxide and to subsequently use them for the separation.