Can anyone help me with how to separate NaF and NaCl?
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consult: We encounter NaF: 30%, NaCl in production: Mixing at a 70% ratio, we want to separate the two salts. A small amount of NaCl is allowed in NaF, but NaF is not allowed in NaCl. Please help provide methods and ideas, or methods that can detect the content of NaCl and NaF. Thanks!
Dissolved in water and separated by difference in solubility
The poster's problem is a process issue and cannot be solved by relying on simple solubility data. This is a phase equilibrium of three components, and temperature has an effect on the equilibrium. Separation using general physical methods may not meet the poster's purity requirements. It may be necessary to assist with chemical separation or with the help of some chemical separation means.
I think physical methods are also feasible, using the saturated precipitation method. The first step is to determine the molar ratio of nacl to naf so that you can proceed to the next step. (First you have to reach saturation) Then add hydrochloric acid (industrial grade). According to the ratio of the first step, the molar amount of hydrochloric acid added and the molar amount of nacl must be equal, so as to ensure that equal amounts of nacl are precipitated. After filtering, add hydrofluoric acid to it to precipitate naF in equal amounts. The question is whether your two solutions of 30% and 70% are saturated. If it's not saturated it's very complicated.
At present, we are also taking advantage of this to do our work.
You're right, but the general idea is this. There is a problem in the middle analysis process! !
Hello, we determine the number of components in waste salt treatment, and it also depends on the depth of our main reaction. There is no good way to simply measure the chemical composition of components. I have only done it using ion chromatography, which is feasible. However, the unit does not have equipment that is too expensive and cannot meet the needs of normalized processing. As for the introduction of hydrochloric acid and hydrofluoric acid, it is not realistic for us. Thank you for your valuable advice! !