Application of evaporation crystallization process in lithium extraction from lithium battery wastewater

With the explosive development of the new energy industry, lithium battery production, recycling and cascade utilization have generated massive volumes of complex lithium battery wastewater every year. This kind of wastewater contains high-concentration lithium salts, fluorides, heavy metals and soluble miscellaneous salts, which cannot be effectively recycled by traditional filtration and chemical precipitation technologies. The mature and industrial-verified evaporation crystallization process has become the most reliable technical route for precise lithium extraction and wastewater resource utilization, helping global new energy enterprises turn waste lithium-containing wastewater into recyclable lithium resources and achieve green and low-carbon production.

Traditional lithium battery wastewater treatment only focuses on pollutant discharge compliance, ignoring the high economic value of lithium elements in wastewater, resulting in serious resource waste and high subsequent solid waste disposal costs. The optimized evaporation crystallization process adopted by CONQINPHI’s Evaporation Crystallization System can accurately separate lithium salts from miscellaneous salts and impurities through low-temperature phase change concentration and directional crystallization, realizing high-purity lithium extraction while completing closed-loop wastewater treatment. This dual-value model of environmental protection and resource recovery has become the mainstream development trend of the new energy environmental protection industry.

Composition Characteristics & Treatment Difficulties of Lithium Battery Wastewater

To implement efficient lithium extraction and stable wastewater treatment via the evaporation crystallization process, it is essential to clarify the unique composition and technical difficulties of lithium battery wastewater. Different from ordinary industrial wastewater, lithium battery wastewater has complex pollutant components and high resource recovery value, putting forward higher requirements for professional treatment equipment and processes.

1. Main Pollutant & Resource Components

Lithium battery wastewater mainly comes from battery cell cleaning, electrolyte recovery, pole piece regeneration, waste battery dismantling and production workshop flushing links. It is rich in lithium-containing substances such as lithium carbonate, lithium hydroxide and lithium chloride, accompanied by fluorides, phosphates, copper, nickel, cobalt and other heavy metal ions. In addition, it contains a large number of soluble miscellaneous salts including sodium sulfate, potassium chloride and ammonium salts, with high TDS value and unstable water quality, which is a typical high-salt, high-value industrial wastewater.

2. Technical Bottlenecks of Traditional Treatment Methods

Conventional chemical precipitation and membrane separation processes can only remove heavy metals and partial suspended impurities, but cannot separate and recover dissolved lithium ions effectively. Membrane equipment is prone to scaling and blockage caused by high-salt crystallization, with short service life and high operating costs. Most importantly, traditional processes cannot realize graded separation of lithium salts and miscellaneous salts, resulting in low lithium extraction rate and inability to obtain high-purity lithium products. Only the precise and controllable evaporation crystallization process can solve the above industry pain points fundamentally.

Working Principle of Evaporation Crystallization Process for Lithium Extraction

CONQINPHI’s customizedEvaporation Crystallization System is specially optimized for the physical and chemical characteristics of lithium battery wastewater. Adopting MVR mechanical vapor recompression low-temperature evaporation technology and directional crystallization control logic, the whole evaporation crystallization process realizes graded concentration, salt separation and high-efficiency lithium extraction, ensuring both resource recovery efficiency and wastewater zero discharge effect.

Step 1: Precision Pretreatment to Purify Raw Wastewater

Raw lithium battery wastewater first enters the professional pretreatment unit to remove interference impurities that affect lithium extraction and crystallization effect. Through pH adjustment, defluorination, heavy metal capture and multi-stage filtration, the system removes suspended solids, free heavy metal ions and fluoride impurities in the wastewater, effectively avoiding equipment scaling, corrosion and lithium salt crystallization interference. The purified lithium-containing brine provides stable feed water conditions for the subsequent evaporation crystallization process.

Step 2: Low-Temperature MVR Evaporation Concentration

The pretreated lithium-containing brine is transported to the core MVR evaporation unit of the Evaporation Crystallization System. Under low-temperature vacuum negative pressure environment, the system recycles secondary steam latent heat through mechanical compression, realizing continuous concentration of brine without relying on external steam supply. With the gradual evaporation of water, the concentration of lithium salts in the brine continues to increase, while most low-value miscellaneous salts are concentrated and precipitated in advance, realizing preliminary separation of miscellaneous salts and lithium salts and greatly improving the purity of subsequent lithium extraction.

Step 3: Directional Crystallization & High-Purity Lithium Resource Recovery

By precisely controlling evaporation temperature, vacuum degree and material liquid circulation rate, the evaporation crystallization process realizes directional supersaturated crystallization of lithium salts. High-purity lithium salt crystals are separated through professional solid-liquid separation equipment, which can be directly reused in lithium battery production after simple purification. The residual mother liquid flows back to the evaporation system for cyclic treatment, and the condensed clean water can be fully reused for workshop production and equipment cooling. The whole closed-loop process realizes efficient lithium extraction and complete zero discharge of lithium battery wastewater.

Core Advantages of CONQINPHI Evaporation Crystallization System for Lithium Battery Wastewater

Compared with traditional treatment and lithium extraction technologies, CONQINPHI’s professional Evaporation Crystallization System has prominent advantages in resource recovery rate, energy saving, operational stability and economic benefits, and is widely recognized in the global new energy environmental protection industry.

1. High Lithium Extraction Rate & High Purity Resource Recovery

Relying on the precise controllableevaporation crystallization process, the system breaks through the bottleneck of low recovery rate of traditional technologies. It can efficiently capture dissolved lithium ions in complex lithium battery wastewater, with the lithium extraction rate exceeding 98%. The recovered lithium salt products have high purity and stable quality, which can be directly applied to lithium battery material production, bringing considerable economic benefits for enterprises.

2. Ultra-Low Energy Consumption & Low Operating Cost

Equipped with advanced MVR energy-saving technology, the Evaporation Crystallization System recycles more than 90% of steam latent heat, reducing energy consumption by 60%–70% compared with traditional multi-effect evaporation equipment. The whole process only consumes electric energy, no external steam boiler is required. Matched with fully automatic PLC intelligent control system, it realizes unattended operation, effectively reducing manual operation and maintenance costs, with outstanding long-term economic advantages.

3. Anti-Corrosion & Anti-Scaling Customized Design

Aiming at the corrosive and easy-scaling characteristics of fluorine-containing and high-salt lithium battery wastewater, the equipment adopts high-quality 316L stainless steel, duplex steel and customized anti-corrosion materials. It is equipped with automatic online cleaning and intelligent anti-scaling system, which effectively resists medium corrosion and prevents pipeline and heat exchanger scaling, ensuring long-term stable operation of the evaporation crystallization process and avoiding shutdown maintenance losses.

4. Modular Design & Wide Application Range

The system adopts integrated skid-mounted modular structure, featuring compact layout, convenient transportation and fast on-site installation. CONQINPHI supports personalized customization according to customers’ wastewater volume, lithium content, salt composition and site conditions. It is widely applicable for lithium extraction and wastewater treatment in lithium battery production, waste battery recycling, new energy material processing and other projects, with strong flexibility and scalability.

Practical Industry Application Cases

CONQINPHI has rich engineering experience in new energy wastewater resource recovery, and has delivered many successful evaporation crystallization and lithium extraction projects for global lithium battery enterprises.

A large new energy battery recycling enterprise in Southeast Asia has long faced the problems of low lithium resource utilization rate and high wastewater treatment cost in lithium battery wastewater disposal. After adopting CONQINPHI’s customized Evaporation Crystallization System, the project realizes efficient separation of lithium salts and miscellaneous salts through optimized evaporation crystallization process. The stable lithium extraction operation greatly improves resource utilization efficiency, and the reused clean water realizes zero wastewater discharge. The project has created significant economic and environmental double benefits for the enterprise and has been running stably for a long time.

Get Your Custom Lithium Extraction & Wastewater Treatment Solution

Are you troubled by low lithium resource recovery rate and high treatment cost of lithium battery wastewater? Do you need an efficient and energy-saving evaporation crystallization solution to realize high-value lithium extraction and zero discharge?

Contact CONQINPHI’s professional engineering team now! We provide free technical consultation, wastewater sample analysis and customized scheme design. Submit your project parameters through our official website to get a detailed quotation and process flowchart within 24 hours. Help your enterprise maximize lithium resource value and achieve sustainable green development.