The diffusion dialyzer is a series of structural units composed of a certain number of membranes; each unit has an anion homogeneous membrane separated into a dialysis chamber and a diffusion chamber. When the waste acid liquid and the receiving liquid (tap water) are used, the concentration of the acid and its salts on the waste acid liquid side is much higher than that on the waterside. According to the principle of diffusion dialysis, due to the existence of concentration gradient, the waste acid and its salts diffuse in a direction However, the membrane has selective permeability to anions, so under the action of the concentration difference, the anions on the waste acid side are attracted and smoothly pass through the membrane pores and enter the waterside. At the same time, according to the requirements of electric neutrality, cations will also be entrained. Because the hydration radius of H+ is relatively small, the charge is small; while the hydration radius of metal salts is large and the charge is more, so H+ will preferentially pass through the membrane so that the acid in the waste liquid will be separated.
Application fields: steel, chemical foil, storage battery, copper hydrometallurgy, aluminum profile, polysilicon, electroplating, titanium processing, wood saccharification, rare earth and other non-ferrous metal smelting and other industrial fields. The acid recovery rate of this device can reach over 80%, and the metal ion removal rate is over 90%.
Ion Exchange Membrane for Diffusion Dialyzer
Diffusion dialysis AEM for acid separation
| Diffusion dialysis AEM for acid separation | ||
| Type | SYDDA1 | SYDDA2 |
| Standard | High Flux | |
| Thickness (mm) | 0.30~0.32 | 0.20~0.30 |
| Water content (%) | 40~70 | 20~50 |
| Diffusion Coefficient (10-7m/s) | ≥5 | ≥5 |
| Separation factor H+/Fe2+ | ≥15 | ≥15 |
Diffusion dialysis CEM for alkall separation
| Diffusion dialysis CEM for alkall separation | ||
| Type | SYDDC1 | SYDDC2 |
| Standard | High Flux | |
| Thickness (mm) | 0.25~0.28 | 0.15~0.25 |
| Water content (%) | 50~70 | 40~80 |
| Diffusion Coefficient (10-7m/s) | ≥15 | ≥2 |
| Separation factor OH-/AlO2+ | ≥10 | ≥15 |
Characteristics of Diffusion Dialyzer
Diffusion dialysis is different from electrodialysis in that it does not require an external DC electric field, but only relies on the concentration difference of the solution on both sides of the membrane as the driving force. Ion-exchange membrane diffusion dialysis utilizes the selective permeability of ion-exchange membranes to separate substances. Since diffusion dialysis does not require an external electric field, the diffusion dialysis device eliminates the need for an electrode chamber, making the device simpler. The advantage of diffusion dialysis is that no external energy is required.Applications of Diffusion Dialysis:
Diffusion dialysis has the advantages of simple equipment, low investment and basically no power consumption. It can be used for:
1. Recover sulfuric acid or hydrochloric acid from metal processing waste liquid in metallurgical industry;
2. Recover sulfuric acid from concentrated sulfuric acid method wood saccharification liquid;
3. Recovering sodium hydroxide from the treatment liquid of broken wood pulp in viscose fiber industry;
4. Recover acid, alkali, etc. from the regeneration waste liquid of the ion exchange resin device. The most widely used in industry is the recovery and treatment of iron and steel pickling waste liquid. Iron and steel pickling waste generally contains about 10% sulfuric acid and 12% to 22% ferrous sulfate.
For example, sulfuric acid is recovered from pickling steel waste liquid by diffusion dialysis. The original waste acid solution contains 60-80g/L of sulfuric acid and 150-200g/L of ferrous sulfate. After treatment by diffusion dialysis, the acid recovery rate reaches 70%, the recovered acid solution contains sulfuric acid 42～56g/L, ferrous sulfate less than 15g/L.
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