Sodium chloride standards for the chlor-alkali industry
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Hello everyone: Our company has a recycling project underway recently, focusing on sodium chloride by-products that can be used in the chlor-alkali industry. I’m not sure if there are any requirements for sodium chloride in the chlor-alkali industry, such as regarding heavy metals. Or are there any industry standards or other unified standards? I’m begging for help; thanks to all the experts!
The GB/T5462-2015 standard for industrial salts can be referred to. Additionally, there used to be an HG standard for industrial sodium chloride, which is quite old now; it can be found by searching online.
One can refer to the standards for industrial salts. The requirements for salts in the chlor-alkali industry include purity, organic substances, calcium and magnesium ions, carbonate ions, sulfate ions, and many other factors; these requirements do not exactly follow national standards. It is better to consult the manufacturers directly. As for the sodium chloride produced as a by-product of recycling projects, I think it will be difficult to meet the required standards
It is also possible to negotiate relevant quality parameters with downstream users who are willing to accept the by-product salt, and establish one’s own corporate standards; the key is to get those downstream users to accept the by-product salt so that it can be sold. Of course, the enterprise standards you establish also need to be registered with the local quality supervision agency; otherwise, in the absence of product standards as a basis, your by-product salt will be treated as waste, and proper procedures must be followed before it can be transferred.
Okay, thank you. Chlor-alkali companies have stricter requirements for sodium chloride than those specified in the national standards for industrial salt, but are these specific requirements set by each company individually? There’s just no unified standard, right?
Is the requirement for salt in the chlor-alkali industry determined by each company based on its own purification processes and other factors? There is no unified standard
Chlor-alkali companies are well aware of the quality parameters of raw salt that work best for their caustic soda production units; they also know whether it is acceptable to use raw salt with slightly lower values on certain secondary parameters, and any compromise in this regard will be reflected in the price. However, it is often difficult for by-product salt to meet the various quality standards of conventional industrial salt; each case must be considered individually. If chlor-alkali companies are willing to accept it to some extent, they will control the proportion used based on the quality of the by-product salt and the actual production conditions.