For various kinds of contaminations, we can take on different techniques of removal approaches. Here are numerous usual techniques and principles of sodium silicate solution.
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Precipitation technique
The rainfall technique is an approach that utilizes impurities ions to react with certain chemical reagents to create difficult rainfall so regarding remove it from the sodium silicate service. For instance, for steel ions such as iron ions and aluminum ions, alkaline reagents such as salt hydroxide or potassium hydroxide can be contributed to develop it. The response equation 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 added to form carbonate precipitation. The reaction equation is as follows:
CA ₃ ² ⁻ + Carbon monoxide c → CACO ₃ ↓
Mg ₃ ² ⁻ + Co m → mgco ₃ ↓
The precipitation technique is straightforward and the expense is low, yet you require to focus on the quantity and response problems of the sediment to make certain that the impurities ions can be totally precipitated.
Ion exchange method
The ion exchange technique is to selectively adsorb and exchange the ions in the option with an ion exchange material to remove the approach of impurities ions. Ion exchange material is a polymer material with an ion exchange feature. It can exchange responses with the ion in the remedy, absorb contaminations ions to the material, and keep the helpful ions in salt ions in salt silicate option in the solution.
The ion exchanges are good and can eliminate a range of contaminations ions, however the price of ion exchange resin is greater, and regeneration is required routinely.
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Membrane layer splitting up
The membrane splitting up method utilizes the semi-diaphragm to precisely go through the different parts in the option so as to attain the approach of splitting up and removal. Relying on the diameter dimension and separation principle of the membrane, the membrane separation approach can be separated right into numerous types, such as microfiltration, ultrafiltration, filtering and turn around osmosis.
For impurities such as insoluble solid granules and macromolecular raw material in sodium silicate remedy, mini fillets or ultrafiltration membrane layers can be made use of for eliminating; impurities ions of some tiny molecules can be eliminated with the purification or turn around osmosis membrane layer. The membrane separation technique has the advantages of simple operation, high separation performance, and low energy consumption.
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