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MVR Evaporation Crystallization System for Lithium Extraction and Impurity Removal from Aluminum Electrolyte
Product Overview
This MVR (Mechanical Vapor Recompression) evaporation crystallization system is custom-designed for lithium extraction from aluminum electrolyte. It integrates impurity pretreatment, forced circulation evaporation, cooling crystallization, and mother liquor drying. Capacity ranges from 3 t/h to 6 t/h water evaporation, modularly configurable.
Industry Pain Points
Aluminum electrolyte leachate is a typical hazardous waste and an underestimated "urban lithium mine." It contains high fluoride, high salt, and high lithium: Li₂CO₃ 6–8 g/L, NaF/KF 200 g/L, Al³⁺ 20 g/L, plus Ni/Co/Mn. Traditional multi-effect evaporation suffers from high steam consumption, severe lithium entrainment loss, and fluoride corrosion. When LiF in electrolyte exceeds 7%, aluminum smelting energy consumption rises by 150–200 kWh/t Al, shortening cell life. Lithium recovery has become a necessity for cost reduction and environmental compliance.
Core Technology
Pretreatment: CO₂ dealumination adjusts pH to 8.0–8.5, converting Al³⁺ to Al(OH)₃ for ceramic membrane filtration (Al ≤3–5 mg/L). Chelating resin removes heavy metals to ≤0.05–0.1 mg/L.
MVR Forced Circulation Evaporation Crystallization: Two-stage preheating, single-effect forced circulation, centrifugal compressor, and Oslo DTB crystallizer. 100% secondary vapor reuse; only 0.4–0.5 t steam needed for startup. Evaporation temperature 75–78°C under vacuum. Power consumption ≤45 kWh/t water (3t/h) or ≤42 kWh/t (6t/h). Tube flow velocity ≥3.5 m/s suppresses fluoride scaling.
Freeze-Melt Salt Separation: Concentrate (Li₂CO₃ ≥60–80 g/L, NaF ≥190–220 g/L) enters freezer at 0 to -5°C; NaF·KF mixed salt precipitates and returns to front-end. Mother liquor heated to 95°C for Li₂CO₃ crystallization. Purity 98.5–99.2%, single-pass recovery 88–90%.
Zero Liquid Discharge: Mother liquor dried by scraper film dryer (dry solids ≤3%). Mixed salt sent for hazardous waste disposal. No mother liquor discharge.
Competitive Advantages
Energy Saving: 60–80% lower than triple-effect evaporation. Power consumption 40–55 kWh/t water; operating cost 22–50 RMB/t vs. 90–150 RMB/t for triple-effect. Annual steam savings of 2–4 million RMB for a 100 t/d system.
High Recovery & Purity: Li₂CO₃ purity ≥98.5% (3t/h) or ≥99.2% (6t/h). Total lithium recovery ≥85% with mother liquor recycling.
Heavy-Duty Anti-Corrosion: TA10 titanium alloy (Ti-0.3Mo-0.8Ni) heat exchange tubes, titanium compressor impeller, 316L+PTFE lining, Hastelloy C-276 dryer. Withstands 20–30% HF at 80–85°C.
Zero Discharge & Resource Recycling: Condensate TDS
Typical Project Data
3 t/h System: Feed Li₂CO₃ 5–7 g/L, NaF/KF 180 g/L, Al³⁺ 15 g/L. Concentrate Li₂CO₃ ≥60 g/L, concentration ratio ≥10. Compressor 160 kW. Condensate F⁻ ≤10 mg/L, reuse ≥95%.
6 t/h System: Feed Li₂CO₃ 6–8 g/L, NaF/KF 200 g/L, Al³⁺ 20 g/L. Concentrate Li₂CO₃ ≥80 g/L, ratio ≥12. Compressor 315 kW (isentropic efficiency 86%). Battery-grade Li₂CO₃ purity ≥99.2%, recovery ≥90%.
Applications
Lithium recovery from aluminum electrolyte waste
Cathode carbon block / cell lining recycling
Concentration and crystallization of aluminum electrolyte leachate
Selective lithium enrichment from high-salt wastewater
Service Scope
Full-cycle service: feed analysis, evaporation crystallization experiments, process package (PFD, mass balance, equipment selection, DCS logic), core equipment manufacturing, on-site installation and commissioning, operator training, performance testing, and remote O&M support.
Contact Us
Provide your feed parameters (Li₂CO₃, NaF/KF, capacity, target product specs) for a preliminary process scheme and equipment selection within 2 working days.
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