For various kinds of contaminations, we can adopt different techniques of elimination methods. Below are numerous typical techniques and principles of sodium silicate remedy.
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Rainfall technique
The precipitation approach is a technique that uses contaminations ions to react with certain chemical reagents to create hard rainfall so regarding eliminate it from the salt 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 form it. The response formula is as follows:
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 develop carbonate precipitation. The response formula is as follows:
CA ₃ ² ⁻ + Co c → CACO ₃ ↓
Mg ₃ ² ⁻ + Co m → mgco ₃ ↓
The rainfall technique is straightforward and the cost is reduced, yet you require to take notice of the amount and reaction conditions of the sediment to make certain that the impurities ions can be totally precipitated.
Ion exchange technique
The ion exchange approach is to selectively adsorb and trade the ions in the solution with an ion exchange resin to eliminate the technique of pollutants ions. Ion exchange material is a polymer product with an ion exchange feature. It can trade reactions with the ion in the solution, take in contaminations ions to the material, and keep the valuable ions in salt ions in salt silicate option in the solution.
The ion exchanges are good and can get rid of a range of contaminations ions, yet the cost of ion exchange resin is greater, and regrowth is required consistently.
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Membrane separation
The membrane layer splitting up approach makes use of the semi-diaphragm to selectively travel through the different components in the service so as to achieve the technique of splitting up and elimination. Depending upon the diameter size and separation principle of the membrane layer, the membrane layer splitting up method can be divided right into several kinds, such as microfiltration, ultrafiltration, filtering and turn around osmosis.
For impurities such as insoluble solid granules and macromolecular raw material in salt silicate solution, mini fillets or ultrafiltration membranes can be made use of for getting rid of; pollutants ions of some small particles can be gotten rid of with the filtration or reverse osmosis membrane. The membrane separation method has the advantages of simple operation, high splitting up effectiveness, and reduced power usage.
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