For different kinds of pollutants, we can embrace different approaches of elimination techniques. Here are several common methods and concepts of sodium silicate service.
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Rainfall approach
The precipitation approach is an approach that makes use of impurities ions to respond with specific chemical reagents to produce tough rainfall so regarding eliminate it from the salt silicate service. For instance, for metal ions such as iron ions and aluminum ions, alkaline reagents such as sodium hydroxide or potassium hydroxide can be contributed to create it. The response equation is as adheres to:
Fe ⁻ + 3oh f → Fe (OH) ↓
Al ⁻ + 3oh a → Al (oh) ↓
For calcium and magnesium ions, carbonate reagents such as sodium carbonate or potassium carbonate can be contributed to develop carbonate precipitation. The reaction formula is as complies with:
CA ₃ ² ⁻ + Carbon monoxide c → CACO ₃ ↓
Mg ₃ ² ⁻ + Carbon monoxide m → mgco ₃ ↓
The precipitation approach is straightforward and the cost is reduced, yet you require to take notice of the amount and response problems of the debris to make sure that the impurities ions can be entirely precipitated.
Ion exchange method
The ion exchange technique is to precisely adsorb and exchange the ions in the service with an ion exchange material to get rid of the technique of impurities ions. Ion exchange material is a polymer material with an ion exchange function. It can trade responses with the ion in the service, take in pollutants ions to the resin, and retain the valuable ions in salt ions in salt silicate option in the service.
The ion exchanges are good and can get rid of a variety of contaminations ions, yet the cost of ion exchange resin is higher, and regeneration is needed regularly.
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Membrane layer separation
The membrane layer separation technique makes use of the semi-diaphragm to selectively pass through the different components in the remedy so regarding accomplish the technique of separation and elimination. Relying on the diameter dimension and splitting up principle of the membrane, the membrane splitting up technique can be divided right into a number of types, such as microfiltration, ultrafiltration, filtration and reverse osmosis.
For pollutants such as insoluble strong granules and macromolecular raw material in salt silicate remedy, mini fillets or ultrafiltration membranes can be used for removing; impurities ions of some little particles can be gotten rid of with the filtration or reverse osmosis membrane layer. The membrane splitting up method has the advantages of simple operation, high separation efficiency, and low power intake.
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