For various types of pollutants, we can adopt different approaches of elimination methods. Below are a number of usual techniques and principles of sodium silicate option.
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Rainfall technique
The rainfall technique is a method that uses contaminations ions to respond with specific chemical reagents to create challenging rainfall so as to eliminate it from the salt silicate solution. For instance, for steel ions such as iron ions and light weight aluminum ions, alkaline reagents such as salt hydroxide or potassium hydroxide can be contributed to develop it. The reaction 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 added to create carbonate precipitation. The reaction formula is as follows:
CA ₃ ² ⁻ + Co c → CACO ₃ ↓
Mg ₃ ² ⁻ + Co m → mgco ₃ ↓
The rainfall approach is straightforward and the cost is low, however you need to take notice of the amount and reaction conditions of the sediment to ensure that the pollutants ions can be totally precipitated.
Ion exchange technique
The ion exchange technique is to precisely adsorb and exchange the ions in the solution with an ion exchange resin to get rid of the technique of contaminations ions. Ion exchange material is a polymer material with an ion exchange feature. It can exchange responses with the ion in the remedy, take in impurities ions to the resin, and preserve the beneficial ions in salt ions in sodium silicate option in the remedy.
The ion exchanges are excellent and can get rid of a range of pollutants ions, however the cost of ion exchange resin is greater, and regrowth is required on a regular basis.
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Membrane layer separation
The membrane separation approach makes use of the semi-diaphragm to uniquely pass through the various components in the remedy so as to achieve the method of separation and elimination. Depending upon the diameter dimension and splitting up principle of the membrane layer, the membrane splitting up method can be separated right into numerous kinds, such as microfiltration, ultrafiltration, filtration and turn around osmosis.
For pollutants such as insoluble strong granules and macromolecular organic matter in sodium silicate remedy, mini fillets or ultrafiltration membrane layers can be made use of for getting rid of; impurities ions of some tiny particles can be eliminated with the purification or turn around osmosis membrane layer. The membrane separation approach has the advantages of simple procedure, high separation efficiency, and reduced power usage.
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