Application of Horizontal Spiral Decanter Centrifuge in Mica Separation

1. Applicable Process Sections

• Fine mud removal and classification of mica ore pulp
• Concentration and dewatering of mica concentrate
• Deep dewatering of mica tailings and recycling of reused water

2. Core Adaptation Advantages

High Precision Classification of Fine Particles

Continuous Automatic Operation with Large Capacity

Complete Protection of Mica Flaky Structure

Wear and Corrosion Resistance Adapted to Pulp Characteristics

3. Specific Application in Each Process

3.1 Fine Mud Removal and Classification of Mica Ore Pulp

• Heavy phase / Coarse particles: Mica flakes and coarse sand are pushed by the spiral and discharged from the cone end as rough concentrate.
• Light phase / Fine mud: Fine quartz and feldspar particles (< 0.005 mm) are discharged through liquid overflow, realizing efficient separation of mica from gangue minerals.

3.2 Concentration and Dewatering of Mica Concentrate

• Solid phase: Moisture content of mica concentrate is reduced to 15%–20% in loose dry state, convenient for packaging, transportation, storage and deep grinding processing.
• Liquid phase: Clarified reused water is directly recycled to grinding and scrubbing procedures, saving over 30% water consumption and reducing wastewater discharge.

3.3 Mica Tailings Dewatering and Water Reuse

• The decanter dewaters tailings to moisture content ≤ 25%, meeting the standards for dry stacking, underground backfilling and harmless stockpiling, and avoiding tailings reservoir dam failure risks.
• Separated clean water is recycled to production processes to realize zero discharge of tailings and meet environmental protection requirements.

4. Key Selection Points for Working Conditions

• Material: Wetted parts adopt 316L stainless steel; spiral blades and bowl inner wall are sprayed with tungsten carbide wear-resistant layer (thickness ≥ 0.5 mm).
• Separation Factor: Medium to high separation factor (1500–2500g), adapting to the low density and fine particle characteristics of mica flakes.
• Length-Diameter Ratio: Large L/D ratio (4:1–5:1) to extend material residence time and improve classification accuracy and dewatering effect.
• Control System: Dual-motor variable frequency drive and PLC automatic control; rotating speed (2000–3500 rpm) and differential speed (5–20 rpm) are adjustable to adapt to fluctuations of pulp concentration and particle size.
• Structural Sealing: Fully enclosed anti-leakage design equipped with wear-resistant mechanical seal to eliminate pulp leakage and improve on-site working environment.

5. Advantages Compared with Traditional Equipment

• vs Spiral Classifier: Faster classification, thorough fine mud removal, larger capacity and smaller footprint.
• vs Plate and Frame Filter Press: Continuous automatic operation, no filter cloth consumption, high dewatering efficiency and low labor cost.
• vs Hydrocyclone: Wide classification particle range (0.005–0.1 mm), high concentrate grade and stable operation.

6. Application Precautions

• Remove large impurities (> 2 mm) before feeding to prevent machine jamming and excessive wear.
• Adjust rotating speed and differential speed precisely according to mica flake size and pulp concentration to avoid over-grinding or incomplete classification.
• Regularly inspect the wear condition of tungsten carbide coating and perform timely repair and re-spraying.
• Add a small amount of flocculant such as PAM during tailings dewatering to improve dewatering efficiency and solid dryness.