For various kinds of pollutants, we can take on different approaches of elimination methods. Here are numerous usual techniques and principles of sodium silicate service.
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Rainfall approach
The rainfall approach is a method that makes use of impurities ions to respond with specific chemical reagents to create hard precipitation so as to remove it from the salt silicate remedy. For example, for steel ions such as iron ions and aluminum ions, alkaline reagents such as sodium hydroxide or potassium hydroxide can be included in form it. The reaction formula is as complies with:
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 precipitation. The reaction formula is as adheres to:
CA ₃ ² ⁻ + Carbon monoxide c → CACO ₃ ↓
Mg ₃ ² ⁻ + Carbon monoxide m → mgco ₃ ↓
The precipitation method is basic and the price is low, but you need to pay attention to the quantity and reaction conditions of the debris to make certain that the pollutants ions can be entirely precipitated.
Ion exchange method
The ion exchange method is to precisely adsorb and exchange the ions in the option with an ion exchange resin to get rid of the method of impurities ions. Ion exchange material is a polymer material with an ion exchange feature. It can trade reactions with the ion in the solution, absorb contaminations ions to the material, and preserve the valuable ions in sodium ions in salt silicate service in the service.
The ion exchanges are good and can remove a variety of impurities ions, yet the price of ion exchange material is higher, and regeneration is needed routinely.
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Membrane splitting up
The membrane layer splitting up technique utilizes the semi-diaphragm to uniquely pass through the different elements in the remedy so as to achieve the approach of separation and removal. Depending upon the diameter dimension and splitting up principle of the membrane layer, the membrane splitting up approach can be split right into a number of kinds, such as microfiltration, ultrafiltration, purification and reverse osmosis.
For impurities such as insoluble strong granules and macromolecular raw material in sodium silicate option, micro fillets or ultrafiltration membranes can be utilized for eliminating; contaminations ions of some little molecules can be eliminated with the filtering or turn around osmosis membrane. The membrane layer separation method has the advantages of straightforward operation, high separation efficiency, and reduced power consumption.
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