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Tantalum is mainly used as a high-quality capacitor, and because it is a good thermal conductor, it can be used as an element in various heat exchangers and heaters. It can also be used in medical equipment because of its corrosion resistance.
Niobium has a higher melting point and is mostly used in the aviation field. Due to its corrosion resistance, it is mostly used to improve the strength and corrosion resistance of alloy materials. Tantalum niobium carbide can be used as superhard cutting tools.
With the depletion and increasing shortage of tantalum ore, tantalum in tin slag has gradually become the main source of tantalum in the world. Coltan is a dark black metallic ore from which the elements niobium and tantalum are extracted. The mineral dominated by niobium in coltan is columbite, and the mineral dominated by tantalum is tantalite.
The beneficiation process of tantalum-niobium ore is determined by the characteristics of its rare metal ores, the content of valuable components in the raw ore, and the mineral composition. Currently commonly used mineral separation processes include gravity separation, magnetic separation, electric separation, flotation, chemical treatment, etc. Since the content of tantalum and niobium in the ore is extremely low, rough separation is generally required before mineral processing.
Cleaning: This step will use a drum scrubber or drum screen. If the raw ore contains more clay or heavy clay, a drum washer must be used. If the raw ore contains no sticky clay, only alluvial deposits, or only sand, we can use a trommel screen.
Grading particle size: This step will use a vibrating screen or a high-frequency vibrating screen.
Gravity concentration: This step will use a jig, shaker, and spiral chute.
Magnetic separation: This step uses a three-disk magnetic separator or a wet drum magnetic separator.
Drying: A dryer will be used for this step. If it is a small mining project, there is no need to use a dryer, just dry it naturally in the sun.
If the raw ore is of hard rock type, a crushing stage and a grinding stage need to be added. After the rocks are broken and ground to fine sizes, they are then gravity-selected and magnetic-separated.
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