African Tantalum-Niobium Ore Beneficiation Project

African tantalum-niobium ore beneficiation projects need to consider local ore characteristics, infrastructure conditions, and environmental requirements, employing efficient, low-consumption, and environmentally friendly beneficiation processes to achieve high-level resource development and maximize economic value.

For the characteristics of common African tantalum-niobium placer deposits, a comprehensive process of "ore washing and desliming—gravity separation enrichment—magnetic separation purification—tailings environmental treatment" is recommended, balancing efficiency and sustainability.

1. Pretreatment: Ore washing and screening

• ‌Objective: To remove clay and sludge to prevent clogging of subsequent equipment.
• Equipment: Cylindrical washing machine + vibrating screen;
• Process parameters: Feed particle size ≤50mm, water pressure ≥0.3MPa, throughput 50–100t/h;
• Effect: Improves slurry dispersibility and enhances subsequent sorting efficiency.

2. Re-selection and enrichment (core step)

Taking advantage of the high density of tantalum and niobium minerals (6.3–8.0 g/cm³), preliminary enrichment is achieved through gravity separation.

• Roughening Equipment: Jigs (such as sawtooth wave jigs) process coarse-grained ore (0.1–5 mm), achieving a recovery rate of over 70%.
• Cleaning Equipment: Spiral sluice + shaking table, used for fine-grained ore separation, which can increase the concentrate grade to approximately 60%.
• Advantages: Low cost, low energy consumption, no chemical reagent pollution, and suitable for areas in Africa with power shortages.

3. Magnetic separation purification

Tantalum and niobium minerals are weakly magnetic, and impurities such as iron minerals and garnets can be removed by high-gradient magnetic separators.

• Equipment: Dry high-intensity magnetic separator (field strength 12000–16000 Gs);
• Function: To further improve the purity of the concentrate and meet the requirements of high-end electronic materials for impurity content.

4. Tailings and Environmental Management

• ‌Tailings Treatment: Tailings are centrally stored in tailings ponds, with anti-seepage layers and a water recycling system to achieve water resource recycling.
• Environmental Requirements: Heavy metal leakage must be avoided, and green mine standards must be met, especially in ecologically sensitive areas where strict supervision is required.