For different sorts of pollutants, we can take on various methods of removal approaches. Right here are numerous typical methods and concepts of sodium silicate remedy.
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Rainfall approach
The precipitation method is a technique that utilizes pollutants ions to react with certain chemical reagents to produce hard precipitation so regarding eliminate it from the sodium silicate service. For example, for steel ions such as iron ions and light weight aluminum ions, alkaline reagents such as sodium hydroxide or potassium hydroxide can be included in develop it. The reaction formula is as follows:
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 form carbonate precipitation. The response equation is as adheres to:
CA ₃ ² ⁻ + Carbon monoxide c → CACO ₃ ↓
Mg ₃ ² ⁻ + Carbon monoxide m → mgco ₃ ↓
The precipitation method is basic and the cost is reduced, yet you require to focus on the amount and response conditions of the debris to make sure that the impurities ions can be completely precipitated.
Ion exchange approach
The ion exchange method is to selectively adsorb and exchange the ions in the remedy with an ion exchange material to get rid of the approach of pollutants ions. Ion exchange resin is a polymer material with an ion exchange feature. It can exchange responses with the ion in the option, absorb impurities ions to the material, and retain the beneficial ions in salt ions in sodium silicate remedy in the service.
The ion exchanges are good and can get rid of a selection of contaminations ions, however the cost of ion exchange material is greater, and regrowth is required on a regular basis.
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Membrane layer separation
The membrane separation method makes use of the semi-diaphragm to selectively pass through the various components in the option so regarding achieve the method of splitting up and elimination. Depending on the diameter dimension and splitting up concept of the membrane layer, the membrane layer separation approach can be divided right into several kinds, such as microfiltration, ultrafiltration, filtering and turn around osmosis.
For impurities such as insoluble strong granules and macromolecular organic matter in sodium silicate solution, mini fillets or ultrafiltration membrane layers can be utilized for removing; pollutants ions of some little molecules can be removed with the filtration or turn around osmosis membrane. The membrane separation technique has the advantages of straightforward procedure, high separation efficiency, and low power intake.
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