Discussion on a brine purification process without a pre-treater
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I need help. Dear experts on this forum, which filter can achieve the same processing accuracy as one equipped with a preprocessor, without having a preprocessor of its own? Especially those that are already in use in relevant chlor-alkali enterprises – how should magnesium ions, which lack pretreatment devices, be handled? It would be best to be able to provide relevant data, thank you :)
There are some companies that do not use a preprocessor for the brine; it seems that in the past the calcium and magnesium content in such brine was not very stable, but I’m not sure what the situation is now.
Since it’s called a preprocessor-less version, magnesium doesn’t require any additional processing. Our factory has been using it for 2 years, and the results are good. But each type of raw salt is different, and there are various differences on-site as well; even with the same processing method, the results can vary significantly. Please consider a process that suits your operating conditions.
A membrane filtration process with higher filtering precision and strong anti-pollution capabilities can be chosen
Currently, the salt used in this industry is refined vacuum salt, and the brine is also refined brine; therefore, during the refining process, calcium, magnesium, and sulfate ions are removed. As a result, unprefreated processes such as DRM, as well as ceramic membranes, can be used, allowing for the simultaneous removal of calcium and magnesium during the salt purification process. The most fundamental reason is that less sea salt is used nowadays, so magnesium no longer requires pretreatment to meet the treatment requirements.
In processes without a pretreater, sodium hydroxide and sodium carbonate must be added all at once, which inevitably results in a certain amount of sodium carbonate being wasted. Moreover, the flexibility in operation is much lower, and the quality requirements for the raw salts are much stricter. There are many domestic examples of its use; the advantages are: the one-time investment cost is definitely much lower, and it is simple to operate. It is still best to make a comprehensive assessment based on the quality of local raw salt; if sea salt is used, it should be pre-treated, such as by washing it to remove calcium and magnesium ions from it.