For different kinds of pollutants, we can take on different approaches of removal approaches. Here are several common approaches and principles of sodium silicate solution.
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Precipitation approach
The precipitation approach is a method that makes use of impurities ions to react with specific chemical reagents to generate challenging precipitation so as to eliminate it from the salt silicate remedy. For instance, for metal ions such as iron ions and aluminum ions, alkaline reagents such as salt hydroxide or potassium hydroxide can be added to create it. The response equation 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 included in develop carbonate precipitation. The reaction equation is as complies with:
CA ₃ ² ⁻ + Carbon monoxide c → CACO ₃ ↓
Mg ₃ ² ⁻ + Co m → mgco ₃ ↓
The rainfall method is straightforward and the price is low, but you need to take notice of the amount and reaction problems of the debris to make certain that the pollutants ions can be totally precipitated.
Ion exchange technique
The ion exchange method is to uniquely adsorb and trade the ions in the service with an ion exchange material to eliminate the technique of impurities ions. Ion exchange material is a polymer product with an ion exchange feature. It can trade reactions with the ion in the solution, take in impurities ions to the material, and preserve the beneficial ions in sodium ions in sodium silicate remedy in the service.
The ion exchanges are good and can eliminate a selection of contaminations ions, however the rate of ion exchange resin is greater, and regrowth is needed routinely.
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Membrane splitting up
The membrane splitting up method makes use of the semi-diaphragm to precisely travel through the various components in the service so as to attain the method of separation and removal. Relying on the diameter size and separation principle of the membrane layer, the membrane layer splitting up technique can be divided right into numerous kinds, such as microfiltration, ultrafiltration, filtering and reverse osmosis.
For impurities such as insoluble strong granules and macromolecular raw material in salt silicate option, micro fillets or ultrafiltration membrane layers can be used for eliminating; pollutants ions of some tiny particles can be removed with the purification or reverse osmosis membrane layer. The membrane separation technique has the benefits of basic procedure, high splitting up effectiveness, and low energy intake.
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