Overview
The tank mixer-settler is a specialized extraction equipment widely used in hydrometallurgy, chemical synthesis, and solvent recovery processes. It integrates both mixing and phase separation functions within a single unit, offering a compact solution for continuous liquid-liquid extraction. The design typically consists of a mixing chamber with mechanical agitators followed by a settling zone where the two immiscible phases separate by gravity. This equipment is favored for its operational simplicity, scalability, and high extraction efficiency compared to alternative extraction methods.
Structure and Working Principle
Structurally, the tank mixer-settler comprises three key sections: the mixing compartment with impellers or turbines, the transition zone for flow stabilization, and the settling chamber with inclined plates or coalescers. The mixing intensity and residence time are carefully balanced to achieve optimal mass transfer without causing stable emulsions. During operation, the two liquid phases (usually an aqueous and organic phase) are fed into the mixer where solutes transfer between phases. The mixture then flows into the settler where the phases separate based on density differences, with weirs controlling the interface level. The design ensures minimal cross-contamination between stages in multi-unit setups.
Key Features
Modern tank mixer-settlers offer several advanced features including variable-speed agitators for process optimization, sight glasses for phase interface monitoring, and CIP (clean-in-place) systems for pharmaceutical applications. The equipment often includes anti-vortex baffles and coalescing aids to enhance phase separation. Materials of construction are selected based on chemical compatibility – stainless steel for most inorganic systems, while PP or PTFE-lined units handle highly corrosive media. Modular designs allow for easy capacity expansion, and some models feature integrated heating/cooling jackets for temperature-sensitive processes.
Application Areas
Primary applications include metal extraction (copper, rare earths, uranium), pharmaceutical intermediate purification, and specialty chemical manufacturing. In hydrometallurgy, they extract metals from leach solutions using selective organic extractants. The pharmaceutical industry utilizes them for antibiotic recovery and chiral compound separations. Emerging applications include lithium extraction from brines and recycling of electronic waste. Their ability to handle viscous or particle-containing streams makes them preferable over column extractors in many scenarios.
Maintenance and Precautions
Routine maintenance includes inspecting mechanical seals on agitator shafts, checking for erosion in mixing elements, and verifying settler plate alignment. Bearings typically require lubrication every 3-6 months depending on operating hours. Critical precautions include avoiding operation outside design flow rates (which may cause carryover), monitoring for third-phase formation, and ensuring proper ventilation when handling volatile solvents. For toxic systems, double mechanical seals with barrier fluid are recommended. Regular calibration of interface level controls prevents operational upsets.
B2B Procurement Guide
When procuring tank mixer-settlers, specify required throughput (typically 1-100 m³/hr), phase properties (density difference, viscosity), and corrosion requirements. Lead times range from 8-20 weeks for custom designs. Key suppliers include major process equipment manufacturers with extraction expertise. Consider total cost of ownership – while PP units have lower upfront costs, stainless steel often offers better longevity. Request FAT (factory acceptance testing) for custom units, and verify compliance with industry standards like ASME BPE for pharmaceutical applications.
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