For various types of impurities, we can embrace different approaches of elimination techniques. Below are several typical methods and concepts of salt silicate service.
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Precipitation approach
The precipitation technique is an approach that uses contaminations ions to react with certain chemical reagents to generate challenging rainfall so regarding remove it from the salt silicate solution. For example, for metal ions such as iron ions and aluminum ions, alkaline reagents such as sodium hydroxide or potassium hydroxide can be contributed to form it. The response formula is as complies with:
Fe ⻠+ 3oh f → Fe (OH) ↓
Al ⻠+ 3oh a → Al (oh) ↓
For calcium and magnesium ions, carbonate reagents such as sodium carbonate or potassium carbonate can be included in form carbonate rainfall. The reaction formula is as adheres to:
CA ₃ ² ⻠+ Co c → CACO ₃ ↓
Mg ₃ ² ⻠+ Co m → mgco ₃ ↓
The rainfall approach is easy and the price is reduced, however you require to take note of the quantity and reaction conditions of the sediment to make sure that the impurities ions can be totally precipitated.
Ion exchange technique
The ion exchange method is to selectively adsorb and exchange the ions in the remedy with an ion exchange material to eliminate the approach of impurities ions. Ion exchange resin is a polymer material with an ion exchange function. It can exchange reactions with the ion in the option, absorb impurities ions to the resin, and keep the valuable ions in sodium ions in salt silicate service in the option.
The ion exchanges are great and can remove a range of pollutants ions, but the rate of ion exchange material is higher, and regrowth is needed consistently.
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Membrane separation
The membrane splitting up technique uses the semi-diaphragm to precisely go through the various components in the remedy so regarding accomplish the technique of separation and elimination. Relying on the diameter size and separation concept of the membrane, the membrane separation technique can be split into a number of kinds, such as microfiltration, ultrafiltration, filtration and turn around osmosis.
For impurities such as insoluble solid granules and macromolecular raw material in salt silicate service, micro fillets or ultrafiltration membranes can be used for removing; contaminations ions of some tiny particles can be gotten rid of with the filtering or reverse osmosis membrane. The membrane splitting up approach has the advantages of simple procedure, high separation effectiveness, and low power usage.
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