For various sorts of impurities, we can embrace different techniques of elimination methods. Right here are several common approaches and principles of salt silicate service.
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Rainfall approach
The precipitation approach is a method that makes use of pollutants ions to respond with specific chemical reagents to create tough precipitation so as to eliminate it from the salt silicate solution. 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 form 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 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 easy and the expense is low, but you require to take note of the quantity and reaction conditions of the debris to make sure that the impurities ions can be completely precipitated.
Ion exchange technique
The ion exchange approach is to precisely adsorb and trade the ions in the solution with an ion exchange resin to remove the technique of contaminations ions. Ion exchange resin is a polymer product with an ion exchange function. It can trade responses with the ion in the option, take in contaminations ions to the resin, and retain the beneficial ions in salt ions in salt silicate option in the remedy.
The ion exchanges are excellent and can get rid of a selection of impurities ions, but the cost of ion exchange resin is higher, and regeneration is needed consistently.
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Membrane layer splitting up
The membrane splitting up method makes use of the semi-diaphragm to uniquely travel through the different elements in the solution so as to accomplish the approach of splitting up and elimination. Relying on the diameter size and splitting up principle of the membrane, the membrane layer splitting up technique can be divided right into several types, such as microfiltration, ultrafiltration, filtering and turn around osmosis.
For impurities such as insoluble strong granules and macromolecular raw material in sodium silicate remedy, mini fillets or ultrafiltration membrane layers 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 method has the benefits of straightforward operation, high separation effectiveness, and low power usage.
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