2019730 · Preparing α-hemihydrate gypsum (α-HH) from phosphogypsum (PG) in electrolyte solution and atmospheric pressure has been developed as an energy-efficient and profitable method to dispose PG ...
view more20221015 · Abstract Direct production of high-strength α-calcium sulfate hemihydrate (α-HH) with no additives was accomplished by the reaction of aluminum sulfate and waste CaCl 2 discarded from Solvay soda plant. For scaling-up this new process, the crystallization kinetics of α-HH was experimentally investigated under varying conditions including …
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view more202259 · Flue-gas desulphurization (FGD) gypsum is a highly prevalent industrial by-product worldwide, which can be an excellent alternative to natural gypsum due to its high content of CaSO4·2H2O. The preparation of α-calcium sulfate hemihydrate is a high-value pathway for the efficient use of FGD gypsum. Here, a dynamic method, or an improved …
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view more202242 · An exception is that the attack and digestion reactors operate under hemihydrate conditions while succeeding reactors operate under conditions favouring the rehydration of hemihydrate to gypsum, which is encouraged by seed dihydrate crystals recycled in slurry from the filter feed.
view more2021121 · Semantic Scholar extracted view of "Preparation of hemihydrate gypsum with controllable morphology in Glycerol-NaCl-Water solutions with maleic acid" by Gaoxiang Chen et al.
view more2023325 · Preparation of a-hemihydrate gypsum crystal is an approach for utilization of phosphogypsum (PG), but the soluble phosphorus impurities in PG have a crucial influence on the performance of a-hemihydrate gypsum.
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