How to convert mirabilite into Glauber’s salt
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Conversion of mirabilite to Glauber’s salt: seek production processes or equipment
This post was last edited by qugd on 2023-12-15 at 12:46. No special processing is required; if it is recovered from other waters containing sodium sulfate, the crystallization temperature can be kept above 33 degrees (in fact, it’s easier to maintain a higher temperature), and the resulting crystals will be anhydrous sodium sulfate (glauber’s salt). Or, anhydrous sodium sulfate (sodium sulfate decahydrate or Glauber’s salt) can be heated to remove water, thereby yielding Glauber’s salt. However, the energy required to completely dehydrate mirabilite is very high.
We currently have mirabilite obtained through cryogenic denitration production, and now we need to consider producing Glauber’s salt; we would appreciate your advice
Are there any impurities? Calcium sulfate also has standards. With an increased output, it is necessary to dissolve and remove impurities, followed by high-temperature crystallization at 118°C, separation, and drying ； Given the low yield, it is recommended to store the product and allow it to air-dry naturally to remove the crystalline water before selling it ；
It is said that just this water loss drying project requires an investment of tens of millions. Glauber’s salt isn’t expensive either; it doesn’t seem worth it.
Our mirabilite has high quality, with sodium sulfate decahydrate content of over 99.5%. The key issue is how to remove the moisture; although the output is not large, dealing with this problem on a long-term basis can be quite troublesome.
I suggest you look into Shanxi Nanfeng Group; they are currently the largest producer of calcium sulfate in the world, and their technology is likely to be the most advanced.
Yes, well, mainly it’s just going to Lady Water – there’s no one else there
Glauber’s salt is anhydrous sodium sulfate, while ordinary mirabilite is sodium sulfate decahydrate. To convert mirabilite into Glauber’s salt, it is necessary to remove all ten crystal waters, and this is a process that requires a significant amount of energy. It is necessary to overcome the binding energy between water, sulfuric acid, and sodium in the solid form of mirabilite, and at the same time transform the water into gaseous water molecules that can be removed from the drying system. The heat of vaporization for those ten molecules of water is not negligible; therefore, the energy consumption involved in converting mirabilite into Glauber’s salt is quite high.
The process for converting mirabilite into Glauber’s salt is now highly mature. It involves using MVR evaporation: first, the mirabilite is heated and dissolved, with steam plus some condensed water being used as the heat source. After heating and dissolution, the mixture is sent to the MVR evaporator where the water is removed. Glauber’s salt is then separated by centrifugation and dried, resulting in a product of very high purity that meets the standards for first-class quality.