How to remove impurities from sodium chloride
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I would like to ask everyone: How can sodium carbonate and sodium bicarbonate be removed from sodium chloride? What is the appropriate pH level to maintain during this process? Additionally, are there any other control measures, such as temperature and pressure, that should be taken?
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2#Is this also called a method? ! The next question is how to remove calcium chloride, sodium carbonate, and sodium bicarbonate from sodium chloride.
Can’t neutralize it with hydrochloric acid? ? ?
He’s an amateur; why bother arguing with him? Just look at his many replies to see.
This post was last edited by qugd on 2021-12-11 at 10:24. In the case of purifying sodium chloride, adding an excess amount of hydrochloric acid can be used to keep the pH at or below 4.5. This essentially ensures that there are no bicarbonate ions present in the solution. Slight heating thereafter can then drive out any dissolved carbon dioxide. When it comes to the purification of concentrated brine from ion-exchange membrane caustic soda, this depends on the requirements of the manufacturing process. Generally, an appropriate amount of hydrochloric acid is added to adjust the pH value to within the range required by the subsequent process. During brine purification, it is necessary to ensure a sufficient amount of alkali present in order to effectively remove calcium and magnesium ions. If it is refined brine from the soda ash process, there is no need to remove these carbonates. The reply from the 2nd floor indicates a lack of understanding of the properties of carbonates and the basic principles of saltwater treatment processes; in other words, it shows that the person is an outsider to this field.
By adding a low concentration of hydrochloric acid and passing the exhaust gas through a sodium hydroxide solution, no precipitate was formed, indicating that all of the sodium bicarbonate had been converted to sodium chloride