For various sorts of impurities, we can adopt different approaches of elimination techniques. Below are numerous usual techniques and principles of salt silicate remedy.
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Precipitation approach
The rainfall approach is a technique that makes use of pollutants ions to react with certain chemical reagents to create challenging rainfall so regarding eliminate it from the sodium silicate remedy. As an example, for steel ions such as iron ions and aluminum ions, alkaline reagents such as salt hydroxide or potassium hydroxide can be included in develop it. The response equation is as adheres to:
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 develop carbonate rainfall. The response formula is as follows:
CA ₃ ² ⁻ + Co c → CACO ₃ ↓
Mg ₃ ² ⁻ + Co m → mgco ₃ ↓
The rainfall method is straightforward and the price is reduced, but you need to pay attention to the quantity and reaction problems of the debris to ensure that the impurities ions can be entirely precipitated.
Ion exchange technique
The ion exchange technique is to uniquely adsorb and exchange the ions in the option with an ion exchange material to eliminate the approach of impurities ions. Ion exchange resin is a polymer product with an ion exchange function. It can trade reactions with the ion in the solution, soak up impurities ions to the material, and keep the valuable ions in salt ions in sodium silicate remedy in the service.
The ion exchanges are good and can get rid of a variety of contaminations ions, yet the rate of ion exchange material is greater, and regrowth is needed on a regular basis.
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Membrane separation
The membrane separation method makes use of the semi-diaphragm to selectively travel through the various elements in the solution so as to achieve the technique of separation and removal. Depending upon the diameter size and separation principle of the membrane, the membrane splitting up approach can be split into numerous types, such as microfiltration, ultrafiltration, purification and reverse osmosis.
For contaminations such as insoluble solid granules and macromolecular raw material in salt silicate solution, mini fillets or ultrafiltration membrane layers can be utilized for getting rid of; contaminations ions of some small molecules can be eliminated with the filtration or reverse osmosis membrane. The membrane layer separation method has the advantages of easy procedure, high splitting up performance, and reduced energy usage.
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