【Product Overview】

A high-efficiency resource recovery unit specifically designed for treating mixed alkali-salt solutions.

【Core strengths】

This system employs a novel two-compartment bipolar membrane (BP-BPM + CEM) configuration for single-step purification of alkaline solutions – such as sodium hydroxide, lithium hydroxide, and potassium hydroxide – contaminated with anionic impurities like sulfate and chloride ions from industries including chemicals, lithium battery manufacturing, and metallurgy. Based on the synergistic principle of water dissociation in the bipolar membrane and selective permeation through the cation exchange membrane, the technology enables deep purification of alkali and simultaneous resource recovery of impurities, eliminating the need for traditional multi-step evaporation-crystallization processes. By precisely controlling ion migration pathways, it fundamentally prevents issues such as equipment scaling caused by impurity accumulation or failure to meet product purity standards. The system simultaneously achieves high-purity alkali regeneration, supporting enterprises in realizing efficient raw material recycling and cleaner production.

【Key Performance & Outcome Data】

【Core strengths】

• Single-Step High-Efficiency Integration
  Utilizes a bipolar membrane (BPM) + cation exchange membrane (CEM) configuration. The feed solution is processed in a single pass: impurity anions like sulfate (SO₄²⁻) and chloride (Cl⁻) are retained in the feed compartment, while cations (Na⁺, Li⁺, K⁺) migrate to the product compartment. There, they combine with OH⁻ ions generated from water dissociation in the BPM under the electric field, forming high-purity alkali solution. The entire process requires no intermediate steps, reducing the process flow by over 70% and cutting the equipment footprint by 50% compared to conventional methods.
• Clog-Free Stable Operation
  Leveraging the exclusive selectivity of the CEM for cations, metal ions follow a defined migration path. This completely eliminates common pain points in traditional purification processes, such as "filter residue clogging equipment" and "significant alkali loss." The system enables long-term, continuous operation without shutdown.

• Fully Closed-Loop Resource Utilization
  The purified alkali solution meets industrial-grade or even electronic-grade standards and can be directly reused in the client's core production processes. No additional purification chemicals are needed, increasing overall raw material utilization by over 90% and achieving the circular economy goal of "turning impurities into resources."
• Low Energy Consumption & Enhanced Economics
  Energy consumption is reduced by over 60% compared to traditional evaporation-crystallization purification. Through precise control of unit voltage, current density, and membrane surface flow rate, the system ensures efficient impurity removal while minimizing power usage. Furthermore, the absence of filter residues and waste liquid discharge significantly reduces environmental treatment costs.