Mixed salt crystallization problem
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Gentlemen, I am currently dealing with a batch of wastewater that contains calcium, magnesium, sodium, sulfate ions, and chloride ions. I want to remove the calcium and magnesium ions as much as possible at the initial stage, with the goal of obtaining sodium chloride crystals and sodium sulfate crystals in the end. Is there anyone among you who is familiar with this type of processing process or can recommend some materials for my reference? Thank you so much :)
Calcium and magnesium can be removed by adding sodium carbonate or sodium hydroxide to form a precipitate. The rest undergoes evaporation crystallization.
Calcium and magnesium can be removed in this way, but what remains cannot be crystallized so easily; if the proportions are not correct, what results is a mixture of salts.
To obtain crystals or even reuse them, crystallization and separation are the only options. I am from a manufacturing company; if you’re looking for a complete solution, please send the relevant parameters to my email address, and we will provide you with a comprehensive technical plan for crystalization and salt separation: 3225774384@qq.com
Sodium sulfate is denitrified using membrane technology, while the remaining brine is treated through evaporation and crystallization
Has Haiyou handled such cases before? There’s concern that the membrane may not be able to withstand sodium chloride; moreover, sodium sulfate won’t remove it completely either
The lifespan of denitration membranes is around one year, and their cost as well as maintenance expenses are high; the person in question should calculate the costs first before making an investment. For processes like this, it is possible to visit a nearby chlor-alkali company for learning purposes*.
Removing calcium and magnesium ions is relatively easy. However, for the separation of sodium chloride and sodium sulfate, the person in question needs to determine the appropriate separation method based on the composition of this brine, as well as the three-component phase diagram of sodium chloride, sodium sulfate, and water. Please consult the experts at the Salt Lake Research Institute; the separation of different components in brine is a specialized field known as brine chemistry or salt chemical engineering. This requires a solid background in knowledge of inorganic salt separation as well as skills in interpreting phase diagrams. Don’t expect to solve a company’s problems without spending any money.
Well, I found some information on salt chemical industry; it’s indeed quite specialized, and it definitely requires spending money to deal with it
It is best for the crystal to be a single salt; mixed salts are difficult to handle. We have long-term experience working with salts
I know engineers from large domestic design institutes specialized in salt and nitrate separation; I can provide their contact information. I’m not sure what the scale of the project is for the person asking this question. They are the China Light Industry Design Institute. The second option, as mentioned above, involves using nanofiltration to achieve separation, and we have proven cases of this approach abroad.