For various kinds of impurities, we can take on various techniques of elimination methods. Here are several common approaches and principles of salt silicate option.
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Rainfall approach
The rainfall method is a technique that utilizes contaminations ions to respond with certain chemical reagents to generate difficult precipitation so as to remove it from the salt silicate option. For example, for steel ions such as iron ions and aluminum ions, alkaline reagents such as salt hydroxide or potassium hydroxide can be added 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 sodium carbonate or potassium carbonate can be contributed to form carbonate rainfall. The response equation is as adheres to:
CA ₃ ² ⁻ + Carbon monoxide c → CACO ₃ ↓
Mg ₃ ² ⁻ + Carbon monoxide m → mgco ₃ ↓
The rainfall method is simple and the price is reduced, but you need to take notice of the amount and response problems of the debris to ensure that the contaminations 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 resin to eliminate the technique of impurities ions. Ion exchange material is a polymer product with an ion exchange function. It can trade responses with the ion in the remedy, absorb impurities ions to the resin, and keep the beneficial ions in sodium ions in sodium silicate solution in the option.
The ion exchanges are excellent and can remove a selection of impurities ions, yet the rate of ion exchange material is higher, and regrowth is called for on a regular basis.
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Membrane splitting up
The membrane layer separation technique makes use of the semi-diaphragm to precisely go through the different parts in the option so regarding accomplish the method of separation and elimination. Depending on the diameter dimension and splitting up concept of the membrane layer, the membrane splitting up method can be divided into a number of types, such as microfiltration, ultrafiltration, filtration and turn around osmosis.
For contaminations such as insoluble solid granules and macromolecular organic matter in sodium silicate option, mini fillets or ultrafiltration membrane layers can be used for getting rid of; impurities ions of some little molecules can be eliminated with the filtration or reverse osmosis membrane. The membrane separation approach has the advantages of simple procedure, high splitting up effectiveness, and reduced power consumption.
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