For different sorts of impurities, we can take on various techniques of elimination approaches. Right here are a number of typical techniques and principles of salt silicate service.
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Precipitation method
The rainfall technique is an approach that makes use of pollutants ions to respond with particular chemical reagents to produce difficult rainfall so as to remove it from the sodium silicate option. For example, for steel ions such as iron ions and aluminum ions, alkaline reagents such as sodium hydroxide or potassium hydroxide can be added to form 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 sodium carbonate or potassium carbonate can be added to develop 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 rainfall method is straightforward and the cost is reduced, however you need to take notice of the amount and response problems of the debris to ensure that the impurities ions can be completely precipitated.
Ion exchange technique
The ion exchange approach is to selectively adsorb and trade the ions in the option with an ion exchange material to remove the technique of contaminations ions. Ion exchange material is a polymer product with an ion exchange feature. It can exchange responses with the ion in the option, absorb contaminations ions to the resin, and retain the useful ions in sodium ions in salt silicate option in the option.
The ion exchanges are good and can get rid of a selection of pollutants ions, however the cost of ion exchange resin is higher, and regeneration is called for on a regular basis.
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Membrane layer splitting up
The membrane layer splitting up technique uses the semi-diaphragm to precisely pass through the various elements in the remedy so regarding attain the method of splitting up and removal. Relying on the diameter size and splitting up concept of the membrane, the membrane splitting up method can be divided right into numerous kinds, such as microfiltration, ultrafiltration, filtration and reverse osmosis.
For pollutants such as insoluble solid granules and macromolecular raw material in sodium silicate service, mini fillets or ultrafiltration membrane layers can be utilized for getting rid of; contaminations ions of some little particles can be gotten rid of with the filtering or turn around osmosis membrane layer. The membrane layer separation approach has the advantages of basic procedure, high splitting up effectiveness, and reduced energy intake.
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