For various sorts of impurities, we can embrace different approaches of removal approaches. Below are several typical techniques and principles of salt silicate service.
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Rainfall technique
The precipitation method is an approach that makes use of impurities ions to react with specific chemical reagents to create difficult rainfall so regarding eliminate it from the salt silicate option. For example, for metal ions such as iron ions and light weight aluminum ions, alkaline reagents such as sodium hydroxide or potassium hydroxide can be contributed to create it. The reaction 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 added to develop carbonate precipitation. The response equation is as adheres to:
CA ₃ ² ⁻ + Co c → CACO ₃ ↓
Mg ₃ ² ⁻ + Co m → mgco ₃ ↓
The rainfall approach is straightforward and the expense is reduced, however you require to take notice of the amount and reaction conditions of the debris to guarantee that the impurities ions can be completely precipitated.
Ion exchange technique
The ion exchange method is to selectively adsorb and trade 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 feature. It can exchange responses with the ion in the solution, absorb pollutants ions to the material, and preserve the beneficial ions in salt ions in salt silicate remedy in the option.
The ion exchanges are good and can get rid of a range of contaminations ions, but the cost of ion exchange material is greater, and regeneration is required on a regular basis.
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Membrane layer separation
The membrane layer separation method uses the semi-diaphragm to uniquely pass through the various parts in the service so as to attain the technique of separation and elimination. Relying on the diameter size and splitting up concept of the membrane, the membrane splitting up technique can be separated right into a number of kinds, such as microfiltration, ultrafiltration, purification and reverse osmosis.
For pollutants such as insoluble strong granules and macromolecular organic matter in salt silicate service, mini fillets or ultrafiltration membrane layers can be made use of for eliminating; contaminations ions of some little particles can be eliminated with the purification or reverse osmosis membrane. The membrane layer splitting up technique has the benefits of straightforward operation, high separation performance, and reduced power intake.
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