Three Major Mineral Processes for Tantalum-Niobium Ore

Tantalum and niobium are key rare metal resources with complex ore compositions. Based on their mineral physical properties, they are mainly processed using four processes: gravity separation, magnetic separation, flotation, and combined beneficiation. Different processes are suitable for different ore conditions.

The density of valuable tantalum and niobium minerals is mostly greater than 4.5 g/cm³, while the density of gangue minerals such as feldspar, quartz, and mica is only 2-3 g/cm³, showing a significant density difference. According to gravity separation standards, tantalum-niobium ore is easily separated by gravity. Gravity separation is often used for roughing and pre-enrichment operations, efficiently removing most gangue and achieving good pre-enrichment indicators.

This process relies on the difference in mineral magnetic properties for separation. Tantalum-niobium ore is a weakly magnetic mineral, often associated with magnetite (strongly magnetic), ilmenite, rutile, cassiterite, quartz, and mica. In production, a low magnetic field is first used to remove strongly magnetic impurities such as magnetite, followed by strong magnetic separation to separate tantalum-niobium ore from non-magnetic gangue minerals, thus recovering the tantalum and niobium minerals.

The overall application of flotation for tantalum and niobium ores is limited, with pyrochlore-type niobium ores representing a mature industrial application scenario. Reverse flotation can utilize fatty acid reagents such as oleic acid and sodium oleate. Flotation is suitable for processing fine-grained tantalum and niobium materials that are difficult to recover by gravity separation, and can separate tantalum, niobium, tungsten, and cassiterite with similar properties, but its application is somewhat limited.