Manufacturing method of gypsum by using biosulfur
and oxidation
(22) 14.10.2022
(43) 22.05.2024
(57) A method for manufacturing gypsum containing a high content of one or more of hemihydrate gypsum, dihydrate gypsum, and anhydrous gypsum using an oxidation reaction with biosulfur is disclosed herein. The manufacturing method according to the present invention is environmentally friendly by minimizing the use of sulfuric acid and produces high-quality gypsum containing more than 70% by weight of hemihydrate gypsum, dihydrate gypsum, and/or anhydrous gypsum. In addition, the manufacturing method according to the present invention utilizes biosulfur generated as a by-product of biogas to solve environmental problems and at the same time has the effect of recycling waste resources. The gypsum produced by the manufacturing method of the present invention has a high content of anhydrous gypsum, hemihydrate gypsum, and/or dihydrate gypsum, and does not contain environmental pollutants such as heavy metal ions due to the use of biosulfur. Therefore it can be used as gypsum for gypsum board, aid for grinding blast furnace slag, admixture for cement, gypsum for slag cement, etc.
(71) EcoBio Holdings Co., Ltd. Seoul 06609 (KR)
