For various kinds of pollutants, we can embrace different methods of removal techniques. Right here are numerous usual techniques and principles of salt silicate remedy.
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Rainfall approach
The rainfall technique is an approach that uses impurities ions to react with certain chemical reagents to generate hard precipitation so regarding remove it from the salt 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 contributed to form 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 contributed to create carbonate rainfall. The response formula is as adheres to:
CA ₃ ² ⁻ + Carbon monoxide c → CACO ₃ ↓
Mg ₃ ² ⁻ + Co m → mgco ₃ ↓
The precipitation technique is simple and the price is low, but you require to take note of the amount and response problems of the sediment to ensure that the impurities ions can be totally precipitated.
Ion exchange technique
The ion exchange technique is to uniquely adsorb and exchange the ions in the service with an ion exchange material to remove the method of pollutants ions. Ion exchange resin is a polymer product with an ion exchange function. It can exchange reactions with the ion in the option, take in pollutants ions to the material, and keep the useful ions in salt ions in salt silicate option in the service.
The ion exchanges are good and can eliminate a selection of pollutants ions, but the cost of ion exchange resin is greater, and regrowth is needed frequently.
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Membrane layer separation
The membrane layer splitting up method uses the semi-diaphragm to selectively travel through the different components in the remedy so regarding achieve the method of separation and removal. Relying on the diameter size and separation concept of the membrane, the membrane splitting up approach can be divided into a number of types, such as microfiltration, ultrafiltration, filtering and reverse osmosis.
For pollutants such as insoluble solid granules and macromolecular raw material in salt silicate solution, mini fillets or ultrafiltration membranes can be utilized for getting rid of; pollutants ions of some little molecules can be gotten rid of with the purification or turn around osmosis membrane layer. The membrane layer splitting up method has the benefits of simple operation, high splitting up efficiency, and low energy consumption.
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