Method for producing wet-process phosphoric acid and by-producing alpha-hemihydrate gypsum and high-purity and high-whiteness alpha-hemihydrate gypsum
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United States of America Patent
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Jun 30, 2020
Grant Date -
Sep 27, 2018
app pub date -
Aug 26, 2016
filing date -
Sep 18, 2015
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Abstract
Provided is a method for producing wet-process phosphoric acid and at the same time obtaining alpha-hemihydrate gypsum as well as high-purity and high-whiteness alpha-hemihydrate gypsum, including: mixing phosphoric acid and phosphate rock powder and performing extraction reaction; adding sulfuric acid solution to continue the reaction so that 30% to 50% of calcium ions are generated into dihydrate gypsum; transferring the dihydrate gypsum to a crystal transformation tank; adding a crystal transformation agent and controlling the crystal transformation conditions to obtain 30% to 50% of normal hemihydrate gypsum; after separation, introducing phosphoric acid extraction solution containing other 30% to 50% of calcium ions in a form of calcium dihydrogen phosphate into decalcification reaction tank; adding sulfuric acid solution diluted by washing liquid and performing decalcification reaction; controlling the crystal transformation conditions and performing crystal transformation reaction to convert the solid into high-purity and high-whiteness alpha-hemihydrate gypsum.
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