For various kinds of impurities, we can take on different methods of removal techniques. Right here are a number of typical methods and principles of sodium silicate remedy.
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Precipitation approach
The rainfall method is an approach that makes use of pollutants ions to react with particular chemical reagents to generate difficult rainfall so as to remove it from the sodium silicate option. For example, for metal ions such as iron ions and light weight aluminum ions, alkaline reagents such as salt hydroxide or potassium hydroxide can be contributed to create it. The reaction equation is as adheres to:
Fe ⁻ + 3oh f → Fe (OH) ↓
Al ⁻ + 3oh a → Al (oh) ↓
For calcium and magnesium ions, carbonate reagents such as salt carbonate or potassium carbonate can be added to develop carbonate rainfall. The response equation is as complies with:
CA ₃ ² ⁻ + Carbon monoxide c → CACO ₃ ↓
Mg ₃ ² ⁻ + Carbon monoxide m → mgco ₃ ↓
The rainfall approach is basic and the price is low, however you need to focus on the quantity and response conditions of the debris to guarantee that the impurities ions can be completely precipitated.
Ion exchange technique
The ion exchange method is to precisely adsorb and exchange the ions in the option with an ion exchange material to eliminate the approach of impurities ions. Ion exchange resin is a polymer product with an ion exchange feature. It can trade reactions with the ion in the option, take in contaminations ions to the resin, and keep the useful ions in sodium ions in sodium silicate option in the remedy.
The ion exchanges are excellent and can remove a selection of pollutants ions, but the price of ion exchange material is greater, and regeneration is required regularly.
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Membrane separation
The membrane layer splitting up approach uses the semi-diaphragm to selectively pass through the various elements in the service so as to achieve the method of splitting up and elimination. Depending upon the diameter dimension and splitting up concept of the membrane layer, the membrane layer separation method can be split into several types, such as microfiltration, ultrafiltration, purification and reverse osmosis.
For impurities such as insoluble solid granules and macromolecular organic matter in salt silicate service, micro fillets or ultrafiltration membranes can be made use of for removing; contaminations ions of some little molecules can be removed with the purification or turn around osmosis membrane. The membrane separation technique has the benefits of easy operation, high splitting up effectiveness, and low energy consumption.
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