Geometallurgical Approach to the Element-to-Mineral Conversion for the Nabbaren Nepheline Syenite Deposit

Camilo Mena Silva,Steinar Ellefmo,Bjørn Sørensen,Kurt Aasly

doi:10.3390/min8080325

Abstract

Nabbaren nepheline syenite, a silica-deficient intrusive rock with low Fe content, was the industrial mineral deposit study case in this study. The quality of industrial mineral products are generally based on their bulk chemistry, which are directly related to their modal mineralogy and mineral chemistry; however, these are costly and time-consuming to determine. A geometallurgical-based methodology, known as element-to-mineral conversion (EMC), was applied to estimate its modal mineralogy based on its given bulk and mineral chemistry. EMC is a convenient and cost-effective technique, which can be used to quickly estimate modal mineralogy. Two EMC methodologies were applied: one least square based, LS-XRD, and one regression based, R-XRD. Additionally, average and specific mineral chemistries were used during estimations. The R-XRD method, a method not yet used for EMC purposes, gave better modal mineralogy estimations than LS-XRD. Considering the restrictions in the method, R-XRD shows potential for improvement and implementation at operational scale, making it a valuable geometallurgical tool for increasing resource performance, easing decision-taking processes, and reducing risks. The use of different mineral chemistries did not influence the modal mineralogy estimation, unlike the method used for it.

Highlights

The industrial minerals sector has grown and diversified in the mining industry at both regional and global scales [1,2,3,4]
Method, a method not yet used for element-to-mineral conversion (EMC) purposes, gave better modal mineralogy estimations than LS-X-ray diffraction (XRD)
The values for the −833/+74 μm fraction is the bulk chemistry calculated from the weighted average of the intermediate fractions from concentrate and tailings

Summary

Introduction

The industrial minerals sector has grown and diversified in the mining industry at both regional and global scales [1,2,3,4]. In contrast to metallic ores, industrial minerals, as a mineral or a group of minerals, are mined not for their metallic content but for their physical and chemical properties [1,5]. Due to their intrinsic characteristics, most industrial minerals are used in their raw form which allows wide product variability strictly tied to consumer specifications [1]. The raw materials were obtained from the Nabbaren deposit, a nepheline syenite. The raw materials were obtained from the Nabbaren deposit, a nepheline syenite deposit located on the Stjernøy. The raw material is concentrated and usually sold to ceramics, paint, and glass industries.

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Discussion

Conclusion