For various kinds of impurities, we can embrace different methods of elimination methods. Right here are a number of typical techniques and principles of sodium silicate solution.
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Precipitation approach
The rainfall approach is an approach that makes use of impurities ions to respond with specific chemical reagents to produce hard rainfall so as to remove it from the sodium silicate solution. 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 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 contributed to develop carbonate precipitation. The response equation is as adheres to:
CA ₃ ² ⁻ + Carbon monoxide c → CACO ₃ ↓
Mg ₃ ² ⁻ + Carbon monoxide m → mgco ₃ ↓
The precipitation technique is simple and the price is reduced, however you need to take note of the quantity and reaction problems of the debris to make sure that the contaminations ions can be totally precipitated.
Ion exchange technique
The ion exchange technique is to precisely 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 product with an ion exchange function. It can exchange reactions with the ion in the option, take in pollutants ions to the material, and retain the valuable ions in salt ions in sodium silicate service in the option.
The ion exchanges are great and can remove a range of impurities ions, however the rate of ion exchange material is greater, and regrowth is needed frequently.
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Membrane splitting up
The membrane splitting up method uses the semi-diaphragm to precisely pass through the various components in the solution so as to accomplish the approach of splitting up and removal. Depending on the diameter size and separation principle of the membrane, the membrane splitting up approach can be divided into several kinds, such as microfiltration, ultrafiltration, filtering and turn around osmosis.
For pollutants such as insoluble solid granules and macromolecular raw material in salt silicate service, micro fillets or ultrafiltration membranes can be utilized for removing; contaminations ions of some tiny particles can be eliminated with the filtering or reverse osmosis membrane. The membrane layer separation method has the advantages of easy operation, high separation effectiveness, and reduced energy consumption.
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