For various kinds of contaminations, we can adopt various methods of removal techniques. Below are numerous common approaches and principles of sodium silicate option.
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Rainfall approach
The rainfall method is a method that makes use of pollutants ions to respond with certain chemical reagents to generate hard rainfall so as to eliminate it from the sodium silicate remedy. 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 included in develop it. The reaction formula is as adheres to:
Fe ⁻ + 3oh f → Fe (OH) ↓
Al ⁻ + 3oh a → Al (oh) ↓
For calcium and magnesium ions, carbonate reagents such as salt carbonate or potassium carbonate can be contributed to form carbonate precipitation. The reaction equation is as adheres to:
CA ₃ ² ⁻ + Co c → CACO ₃ ↓
Mg ₃ ² ⁻ + Co m → mgco ₃ ↓
The precipitation technique is basic and the expense is reduced, however you require to take notice of the quantity and reaction problems of the debris to make certain that the contaminations ions can be totally precipitated.
Ion exchange technique
The ion exchange technique is to selectively adsorb and exchange the ions in the service with an ion exchange material to get rid of the method of contaminations ions. Ion exchange material is a polymer material with an ion exchange function. It can exchange reactions with the ion in the solution, absorb pollutants ions to the material, and preserve the beneficial ions in sodium ions in salt silicate option in the remedy.
The ion exchanges are excellent and can remove a variety of contaminations ions, yet the cost of ion exchange material is greater, and regrowth is called for frequently.
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Membrane separation
The membrane layer separation technique utilizes the semi-diaphragm to selectively pass through the various parts in the option so regarding attain the method of splitting up and removal. Depending upon the diameter dimension and separation concept of the membrane layer, the membrane separation technique can be split right into several types, such as microfiltration, ultrafiltration, purification and reverse osmosis.
For pollutants such as insoluble solid granules and macromolecular organic matter in sodium silicate remedy, mini fillets or ultrafiltration membranes can be used for getting rid of; pollutants ions of some tiny particles can be gotten rid of with the filtering or reverse osmosis membrane layer. The membrane layer separation technique has the advantages of straightforward operation, high separation performance, and low power consumption.
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