Quantitative characterization of rocks to predict the influence of the rock on relevant product properties and system parameters | Part 1: Application of quantitative microstructural analysis

Properties and system parameters

Quantitative characterization of rocks to predict the influence of the rock on relevant product properties and system parameters Part 1: Application of quantitative microstructural analysis

Quelle/Source: TUBAF IAM

1 Paretodiagramm zur Auswirkung verschiedener Einflussgrößen auf die Produktpartikelform in einer Zerkleinerungsmaschine (Beispiel: Rotorschleudermühle; verschiedene Gesteine) • Pareto diagram showing the effect of various influencing parameters on the product particle shape in a comminution machine (example: rotor centrifugal mill; various rocks)

Quelle/Source: TUBAF IAM

2 Verfahrensablauf zur Gesteinsuntersuchung • Process flow for rock analysis

Quelle/Source: TUBAF IAM

3 Vereinfachtes Schema einer Gewinnungs- und Aufbereitungskette • Simplified schematic showing an extraction and processing chain

Quelle/Source: TUBAF IAM

4 Charakterisierung von Gesteinen • Characterization of rocks

Quelle/Source: TUBAF IAM

5 Vereinfachter Berechnungsablauf zur Ermittlung der Gesteinsparameter • Simplified calculation flow for determination of rock parameters

Quelle/Source: TUBAF IAM

6 Dünnschliffauswertungsmethoden • Thin section evaluation methods

Quelle/Source: TUBAF IAM

7 Verfahrensablauf zur Dünnschliffherstellung • Process flow for preparation of thin sections

Quelle/Source: TUBAF IAM

8 Phasen der Gesteine • Phases of the rocks

Quelle/Source: TUBAF IAM

9 Mineralzusammensetzung (z. B. Granit aus Meißen) • Mineral composition (e.g. granite from Meissen)

Quelle/Source: TUBAF IAM

10 Korngröße der Minerale (Bsp.: Granite) • Particle size of the minerals (e.g. granites)

Quelle/Source: TUBAF IAM

11 Verschiedene Teilchenformen bei Variation der Hauptachsen: Granit (Obercrinitz) – kugelig, Basalt (Deutschland) – nadelig, Gneis (Leubsdorf) – plattig • Different particle shapes on variation of the main axes: granite (Obercrinitz) – spherical, basalt (Germany) – needle-like, gneiss (Leubsdorf) – platy

Quelle/Source: TUBAF IAM

12 Rauhigkeitsgrad der Minerale (Sandstein aus Althüttendorf, Quarzit aus Oberschöna) • Degree of roughness of the minerals (sandstone from Althüttendorf, quartzite from Oberschöna)

Quelle/Source: TUBAF IAM

13 Schematische Darstellung des Superpositionsprinzips für ein orientiertes Gefüge • Schematic showing the superposition principle for an oriented microstructure

Quelle/Source: TUBAF IAM

14 Kennwerte einer räumlichen Anordnung eines Granits aus Meißen • Characteristic values of a spatial arrangement of a granite from Meissen

Quelle/Source: TUBAF IAM

15 Verteilung der Mikrokörper: Granodiorit (Oberottendorf) – dispergierte Phase, Granit (Baden-Baden) – agglomerierte Phase • Distribution of the microbodies: granodiorite (Oberottendorf) – dispersed phase, granite (Baden-Baden) – agglomerated phase

Quelle/Source: TUBAF IAM

16 Raumerfüllung (Basalt aus einer maritimen Lagerstätte) • Density ratio (basalt from a maritime deposit)

Quelle/Source: TUBAF IAM

Tagebau der Porphyr-Kupfer Lagerstätte von Los Pelambres, Chile • Open pit of the Los Pelambres porphyry copper deposits, Chile

Summary: In many technical applications, especially in mining and mineral processing, the properties of the rocks play a big role. In many cases, the current mineralogical-petrographic rock characterization permits only a verbal description of the microstructure. In mineral processing, however, this method is not sufficient for certain applications. Here a quantitative characterization of the rocks is necessary. Quantitative rock characteristics allow assessment of the rock in terms of crushability and product particle shape on the one hand as well as wear and necessary energy consumption on the other hand. They provide an important basis for the selection and operation of machines and equipment in the natural rock industry and processing of raw materials.

1 Introduction

By means of extensive empirical comminution tests with around 20 different types of rocks in different comminution machines, the importance of different factors influencing the product properties was analysed. It could be established that the rock properties have a paramount influence on product properties like, for example, the particle shape. Fig. 1 shows for the example of a tested rotor centrifugal crusher that the influence of the petrographic rock properties on the product particle shape amounts to around 65 %. The possibilities for influencing the particle shape with...

Dr.-Ing. Oleg Popov, TU Bergakademie Freiberg, Institut für Aufbereitungsmaschinen
Prof. Dr.-Ing. Holger Lieberwirth, Institutsdirektor, TU Bergakademie Freiberg, Institut für Aufbereitungsmaschinen
Dr.-Ing. Thomas Folgner, Beratungsingenieur, Haver Engineering GmbH

Properties and system parameters

1 Introduction

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