For various sorts of impurities, we can take on various approaches of removal techniques. Here are a number of usual techniques and concepts of sodium silicate option.
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Precipitation approach
The rainfall approach is an approach that utilizes pollutants ions to react with particular chemical reagents to create hard precipitation so as to remove it from the salt silicate option. As an example, for steel ions such as iron ions and light weight aluminum ions, alkaline reagents such as sodium hydroxide or potassium hydroxide can be contributed to develop it. The reaction equation 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 included in form carbonate rainfall. The reaction equation is as adheres to:
CA ₃ ² ⁻ + Co c → CACO ₃ ↓
Mg ₃ ² ⁻ + Co m → mgco ₃ ↓
The precipitation technique is straightforward and the expense is low, yet you need to focus on the amount and response problems of the sediment to ensure that the contaminations ions can be totally precipitated.
Ion exchange technique
The ion exchange method is to selectively adsorb and exchange the ions in the solution with an ion exchange material to eliminate the approach of impurities ions. Ion exchange material is a polymer product with an ion exchange feature. It can trade responses with the ion in the remedy, soak up impurities ions to the material, and retain the helpful ions in salt ions in sodium silicate option in the service.
The ion exchanges are excellent and can eliminate a variety of pollutants ions, but the price of ion exchange resin is higher, and regeneration is called for frequently.
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Membrane splitting up
The membrane separation method utilizes the semi-diaphragm to uniquely pass through the different components in the remedy so as to attain the approach of separation and elimination. Relying on the diameter size and separation principle of the membrane layer, the membrane splitting up method can be separated right into numerous kinds, such as microfiltration, ultrafiltration, filtration and turn around osmosis.
For pollutants such as insoluble strong granules and macromolecular raw material in salt silicate remedy, mini fillets or ultrafiltration membrane layers can be used for eliminating; contaminations ions of some small molecules can be removed with the filtration or reverse osmosis membrane. The membrane separation technique has the benefits of straightforward operation, high splitting up performance, and reduced power usage.
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