How MVR Evaporation Crystallization Handles Lithium Battery Wastewater?

The rapid growth of the electric vehicle market has driven strong demand for lithium battery cathode materials such as ternary materials and lithium iron phosphate, as well as lithium salts including lithium carbonate and lithium hydroxide. As production scales up, the industry faces a less visible but equally critical challenge: high-salt wastewater treatment and material recovery from the manufacturing process.

Myande Group has developed a mechanical vapor recompression (MVR) evaporation crystallization system to address this. The system compresses secondary vapor generated during evaporation, raising its temperature and enthalpy, and then recycles it as a heat source for the heating chamber. This closed-loop design reduces reliance on external live steam and shifts the primary energy input to electricity. Compared with conventional evaporation processes, energy consumption drops significantly.

High-salt Wastewater Solutions for Lithium Production

Lithium battery material production, including ternary precursors, lithium carbonate, and lithium hydroxide, generates wastewater with complex compositions. These streams typically have high salinity, high hardness, heavy metals, and specific organics such as NMP. Traditional multi-effect evaporators struggle with this type of wastewater. The secondary vapor temperature at the final effect is high, heat transfer temperature differences are large, and scaling inside the heat exchanger tubes is common. These issues not only reduce efficiency but can also cause lithium salts to precipitate along with impurities, lowering the purity of recovered materials.

Myande's MVR system addresses these problems directly. It uses a forced circulation evaporator combined with crystallizer types such as FC, OSLO, or DTB, selected based on the specific application. The system handles continuous evaporation and crystallization in sequence. Circulation flow rates are controlled to reduce scaling on heat exchanger tubes. For wastewater containing heavy metals, the system can be paired with chemical precipitation or other pretreatment steps to ensure effective removal.

In nickel sulfate and cobalt sulfate production, for example, the MVR system evaporates water from the solution to concentrate nickel and cobalt ions. Discharge density is controlled, and the concentrated solution is sent to a cooling crystallizer. The entire process runs under DCS or PLC automation, providing stable operation and low energy consumption.

Resource Recovery and Energy Savings 

The value of this system goes beyond evaporation. It also recovers valuable materials and reduces energy use.

On the recovery side, Myande combines dry pretreatment and wet processing methods to lower product cost and improve efficiency. Compared with older technologies, the system achieves higher recovery rates for lithium, cobalt, and nickel. On the energy side, MVR compresses vapor to higher pressures, improving thermal efficiency and maintaining continuous energy recycling.

Because the system uses electricity instead of live steam for indirect heating, it reduces overall energy consumption and carbon emissions. These savings translate directly to lower operating costs and improved competitiveness for producers.

Technical Capability and Industry Track Record

Myande Group focuses on providing safe, reliable, and energy-efficient mechanical systems and engineering solutions for evaporation and crystallization. The company has been active in the new energy battery raw material sector for several years. Its products and services cover ore-based lithium extraction, brine-based lithium extraction, power battery recycling, and lithium iron phosphate production. Applications include nickel, cobalt, manganese, and lithium raw material processing, as well as high-salt wastewater treatment for ternary precursors and lithium iron phosphate.

With in-house engineering, precision manufacturing, quality control, and installation capabilities, Myande has delivered multiple large-scale evaporation projects. The scope includes process package development, technical design, evaporator equipment supply, installation and commissioning, system integration, and operator training.

Moving Toward Sustainable Lithium Production

Myande's MVR evaporation crystallization systems are already operating in several lithium material production and battery recycling facilities. These systems continuously recover metal salts and water from process streams. As the industry faces new challenges around tighter emission standards and higher material purity requirements, Myande continues to develop its technology to address these demands and support greener, more sustainable production.