For different types of impurities, we can adopt various approaches of elimination approaches. Below are numerous usual methods and principles of sodium silicate service.
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Precipitation method
The precipitation technique is a method that makes use of pollutants ions to react with certain chemical reagents to create tough rainfall so as to eliminate it from the salt silicate option. For instance, for steel ions such as iron ions and aluminum ions, alkaline reagents such as sodium hydroxide or potassium hydroxide can be contributed to develop 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 formula is as follows:
CA ₃ ² ⁻ + Carbon monoxide c → CACO ₃ ↓
Mg ₃ ² ⁻ + Carbon monoxide m → mgco ₃ ↓
The precipitation method is simple and the price is low, yet you require to pay attention to the quantity and response conditions of the sediment to make sure that the pollutants ions can be totally precipitated.
Ion exchange approach
The ion exchange technique is to selectively adsorb and trade the ions in the remedy with an ion exchange resin to eliminate the technique of impurities ions. Ion exchange material is a polymer product with an ion exchange feature. It can trade responses with the ion in the remedy, soak up contaminations ions to the material, and retain the useful ions in salt ions in salt silicate remedy in the solution.
The ion exchanges are excellent and can get rid of a variety of impurities ions, but the cost of ion exchange material is higher, and regrowth is required frequently.
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Membrane splitting up
The membrane splitting up technique uses the semi-diaphragm to precisely travel through the various components in the service so as to attain the approach of separation and removal. Depending upon the diameter size and splitting up concept of the membrane layer, the membrane layer separation method can be separated right into several types, such as microfiltration, ultrafiltration, filtration and turn around osmosis.
For contaminations such as insoluble solid granules and macromolecular organic matter in sodium silicate remedy, mini fillets or ultrafiltration membranes can be made use of for eliminating; impurities ions of some small particles can be removed with the filtering or turn around osmosis membrane. The membrane layer separation approach has the advantages of simple operation, high splitting up performance, and low power intake.
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