For different kinds of contaminations, we can embrace different techniques of elimination methods. Right here are several common methods and concepts of sodium silicate service.
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Rainfall technique
The precipitation method is a method that makes use of impurities ions to react with certain chemical reagents to produce difficult rainfall so as to eliminate it from the sodium silicate option. As an example, for steel ions such as iron ions and aluminum ions, alkaline reagents such as salt hydroxide or potassium hydroxide can be contributed to create it. The response formula is as follows:
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 create carbonate rainfall. The reaction formula is as adheres to:
CA ₃ ² ⁻ + Co c → CACO ₃ ↓
Mg ₃ ² ⁻ + Co m → mgco ₃ ↓
The precipitation technique is straightforward and the price is low, but you require to take note of the quantity and response conditions of the sediment to ensure that the pollutants ions can be entirely precipitated.
Ion exchange approach
The ion exchange approach is to uniquely adsorb and exchange the ions in the solution with an ion exchange material to get rid of the approach of pollutants ions. Ion exchange material is a polymer material with an ion exchange function. It can exchange responses with the ion in the option, soak up pollutants ions to the resin, and maintain the useful ions in sodium ions in sodium silicate option in the solution.
The ion exchanges are excellent and can remove a variety of contaminations ions, but the rate of ion exchange resin is greater, and regeneration is required frequently.
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Membrane layer separation
The membrane layer splitting up method makes use of the semi-diaphragm to precisely go through the different components in the solution so regarding attain the approach of splitting up and elimination. Relying on the diameter dimension and separation principle of the membrane layer, the membrane splitting up technique can be divided into several types, such as microfiltration, ultrafiltration, filtration and reverse osmosis.
For impurities such as insoluble strong granules and macromolecular raw material in sodium silicate remedy, mini fillets or ultrafiltration membrane layers can be used for eliminating; contaminations ions of some tiny particles can be removed with the filtering or turn around osmosis membrane layer. The membrane separation approach has the advantages of easy procedure, high splitting up efficiency, and reduced energy intake.
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