Characterization

Comparative studies of methods for quantitative microstructural analysis in mineral processing

Quelle/Source: TU BAF IAM

Bergbaurevier von Rio Tinto, Huelva/Spanien • Mining district of Rio Tinto, Huelva/Spain

Quelle/Source: TU BAF IAM

1 Charakterisierung von Gesteinen • Characterization of rocks

Quelle/Source: TU BAF IAM

2 Auflösungsvermögen der Bildanalyseverfahren • Resolution of image analysis methods

Quelle/Source: TU BAF IAM

3 Bilder von Lichtmikroskopie (links), REM (Mitte [19]) und Computertomographie (rechts) • Images of light microscopy (left), SEM (centre [19]) and computer tomography (right)

Quelle/Source: TU BAF IAM

4 Flussdiagramm zur Erzeugung von segmentierten, klassifizierten Bildern für die Bildanalyse [17] • Flow chart for making segmented classified images for image analysis [17]

Quelle/Source: TU BAF IAM

5 Punkt-, Linien- und Flächenanalyse (von links nach rechts) • Point, line and area analysis (left to right)

Quelle/Source: TU BAF IAM

6 Datenblatt Gesteinscharakteristika [35] • Datasheet on rock characteristics [35]

Quelle/Source: TU BAF IAM

7 Polarisationsmikroskopische Aufnahme von Olivin (links) und Glimmer (rechts) • Polarization microscope image of olivine (left) and mica (right)

Quelle/Source: TU BAF IAM

8 Verfahrensablauf zur Dünnschliffherstellung • Process flow for thin section preparation

Quelle/Source: TU BAF IAM

9 Datenblatt Gesteinscharakteristika • Datasheet on rock characteristics

Quelle/Source: TU BAF IAM

10 Signalarten der Elektronen [29] • Electron signal types [29]

Quelle/Source: TU BAF IAM

11 BSE-Bild (links – a) [17] und Topographiebild von SE (rechts – b) [42] • BSE image (left – a) [17] and topography image of SE (right – b) [42]

Quelle/Source: TU BAF IAM

12 EDX-Bild (links – a) [12] und Kathodolumineszenzbild (rechts – b) [39] • EDX image (left – a) [12] and cathodoluminescence image (right – b) [39]

Quelle/Source: TU BAF IAM

13 Kikuchi-Linien (links – a) [10] und EBSD-Bild (rechts – b) [10] • Kikuchi lines (left – a) [10] and EBSD image (right – b) [10]

Quelle/Source: TU BAF IAM

14 Lichtmikroskopie (HF links – a) und BSE-Bild (rechts – b) [12] • Light microscopy (HF left – a) and BSE image (right – b) [12]

Quelle/Source: TU BAF IAM

15 Scannen von Bohrkernen [26] • Core scanning [26]

Quelle/Source: TU BAF IAM

16 Modellbetrachtung Gesteinsaufbereitung • Model showing rock processing

Quelle/Source: TU BAF IAM

17 Zusammenhang von äquivalentem Verschleißindex und spezifischer Verschleißrate • Correlation of equivalent wear index and specific wear rate

Quelle/Source: TU BAF IAM

18 Ergebnisse für die selektive Zerkleinerung von verschiedenen Blei-Zink-Erzen, Bewertung mit Maximum für den Erztrennungsgrad • Results for the selective comminution of different lead zinc ores, evaluation with maximum for ore separation degree

Quelle/Source: TU BAF IAM

Summary: In different fields, quantitative microstructural analysis (QMA) has become established as a method for characterizing materials and raw materials. Many studies show that the microstructure of the raw materials significantly influences the product properties (e.g. product shape, particle size distribution), comminution energy and wear. For this reason, it is necessary not only to use qualitative data, but increasingly to collect and utilize quantitative data for optimization of mineral processing. This article provides an overview of selected processes and methods of QMA in geology, petrography, mineralogy and processing of mineral resources.

1‌‌‌‌‌‌‌ Introduction

For the quantitative microstructural analysis of mineral resources, various analytical methods are available, For the quantification of microstructures, different values are required that characterize their modes, structure and texture. These methods differ with regard to preparation of samples for analysis as well as their resolution and range of application. With combinations of different methods, the range of application for the analysis systems is widened as not every analytical method allows the capture of all quantitative microstructural parameters.

The...