For different types of impurities, we can embrace various techniques of elimination methods. Below are numerous usual methods and principles of sodium silicate remedy.
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Precipitation method
The rainfall approach is a method that uses contaminations ions to react with particular chemical reagents to generate challenging rainfall so as to eliminate it from the salt silicate remedy. For example, for steel ions such as iron ions and light weight aluminum ions, alkaline reagents such as salt hydroxide or potassium hydroxide can be added to develop it. The reaction equation 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 contributed to create carbonate rainfall. The reaction equation is as follows:
CA ₃ ² ⁻ + Co c → CACO ₃ ↓
Mg ₃ ² ⁻ + Co m → mgco ₃ ↓
The precipitation approach is easy and the expense is low, but you need to take note of the amount and reaction conditions of the debris to make certain that the contaminations ions can be totally precipitated.
Ion exchange approach
The ion exchange approach is to precisely adsorb and exchange the ions in the solution with an ion exchange material to remove the approach of contaminations ions. Ion exchange material is a polymer material with an ion exchange function. It can exchange responses with the ion in the service, absorb contaminations ions to the resin, and preserve the beneficial ions in salt ions in salt silicate remedy in the remedy.
The ion exchanges are great and can get rid of a range of contaminations ions, yet the price of ion exchange material is higher, and regeneration is called for routinely.
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Membrane layer separation
The membrane layer separation method utilizes the semi-diaphragm to precisely travel through the various parts in the solution so regarding attain the method of separation and elimination. Relying on the diameter dimension and separation concept of the membrane layer, the membrane splitting up method can be separated into several types, such as microfiltration, ultrafiltration, filtration and reverse osmosis.
For pollutants such as insoluble strong granules and macromolecular organic matter in salt silicate service, micro fillets or ultrafiltration membranes can be utilized for eliminating; impurities ions of some small molecules can be gotten rid of with the purification or reverse osmosis membrane. The membrane splitting up technique has the benefits of straightforward operation, high splitting up efficiency, and reduced power intake.
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