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The mother liquor drying system is a crucial end-of-pipe equipment in modern industry for achieving "zero discharge" and resource recovery of high-salt, high-COD, and highly toxic mother liquor. It is widely used in industries such as chemical, pharmaceutical, pesticide, dye, lithium battery, and metallurgy. The system's core concept is "reduction—harmlessness—resource recovery."
Through a complete chain integration of "pretreatment—concentration—drying—tail gas treatment—salt recovery," it transforms mother liquor with a water content of over 90% into dry crystals or granules with a water content of <5% in one step. Simultaneously, it recovers condensate and by-product salt, completely solving the problems of large footprint, strong odor, and secondary pollution associated with traditional evaporation ponds.
| Feature | Advantage Details |
|---|---|
| Small Footprint | The integrated evaporation and drying frame layout allows for a mother liquor production capacity of 10,000 tons per unit area of <500 m², saving 90% compared to traditional drying yards. |
| Low Energy Consumption | Multi-stage heat recovery reduces system steam consumption to <0.12 t·t-¹ water and overall electricity consumption to <45 kWh·t-¹ water, achieving 55% energy savings. |
| High Automation | PLC + touchscreen + cloud monitoring enables one-button start/stop, remote diagnostics, and unattended operation. |
| Corrosion Protection | Surfaces in contact with moisture are made of 2205, 2507, 904L, or titanium; the drying section is lined with silicon carbide, ensuring a lifespan of >10 years. |
| Safety & Environmental | Operates under closed, slightly negative pressure. Inertial protection with oxygen content <3%. Meets GB 50058 dust explosion-proof requirements. |
1. High-Salt Mother Liquor: Processes 300 tons daily using triple-effect forced circulation + MVR, producing 28 tons of NaCl/day. COD <30 mg/L.
2. Pharmaceutical Antibiotic Mother Liquor: Advanced oxidation and disc drying recover sodium acetate with 2% water content. VOCs <20 mg/m³.
3. Lithium-ion Battery Cathode Material: Solidifies heavy metals in crystal lattice, meeting HJ 1091 standards. Salt can be sold as glass flux.
Uses a pump's powerful circulation action to force wastewater through heating tubes at high velocity, ideal for high-viscosity, scaling-prone wastewater.
Utilizes mechanical vapor recompression technology to compress secondary steam, significantly improving thermal energy efficiency.
Utilizes multiple-effect technology where secondary steam from the first effect acts as a heat source for the next, reducing steam consumption.
The mother liquor drying system couples "evaporation + drying" to provide a complete solution with a small footprint, low energy consumption, and high automation. It converts difficult-to-degrade liquor into dry granules and reclaimed water, achieving zero wastewater discharge and resource utilization. It is a standard technology for green industrial upgrading.
