Diffusion dialysis membranes are separation materials driven by a concentration difference. Through selective permeation of acid anions or hydroxide ions, useful components in waste acid and waste alkali migrate to the recovery side, while metal ions and impurities are retained, enabling resource recovery of waste acid and alkali.
Structure and Types
- Diffusion dialysis anion-exchange membrane: has acid permeability and salt rejection capability, and is used for separation of waste acid from salts and acids.
- Diffusion dialysis cation-exchange membrane: has alkali permeability and salt rejection capability, and is used for separation of waste alkali from salts.
- The driving process relies on a concentration gradient, requires no external current, and is a low-energy separation method.
Product Features
- Driven only by a concentration difference, it consumes no electrical energy and has low operating energy consumption.
- Operates at ambient temperature and pressure, with no phase change, a simple process, and low secondary pollution.
- Membrane materials resist acid and alkali corrosion and are suitable for strong acid, strong alkali, and mixed acid systems.
- The recovered liquid can be directly reused in production processes, providing dual value in resource recovery and emission reduction.
Application Industries
- Waste acid recovery from pickling in metallurgical industries such as steel, copper, and aluminum processing.
- Recovery of waste acid and waste alkali from electroplating, passivation, and polishing processes.
- Waste acid and alkali treatment in the titanium dioxide, phosphate fertilizer, and fine chemical industries.
- Resource recovery from acid and alkali waste liquids in new energy production such as lithium batteries and photovoltaics.
Specifications and Models
| Parameter | Unit | Typical value |
|---|---|---|
| Membrane Type | — | Diffusion Dialysis Anion-Exchange Membrane / Cation-Exchange Membrane |
| Acid Permeation Coefficient | — | Actual operating conditions apply (typical values vary by system) |
| Salt rejection | % | 85–95 (typical) |
| Acid recovery rate | % | 80–90 (typical) |
| Operating temperature | ℃ | 5–45 (typical) |
| Applicable acid concentration | — | Actual operating conditions apply (typical values vary by system) |
The data in the table are common ranges for similar equipment and are for selection reference only; specific specifications, models, materials, connections, and control methods must be confirmed during the selection stage based on water quality, treatment scale, and site conditions.