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1.发明授权
公开(公告)号：EP3351506B1
公开(公告)日：2020-09-30
申请号：EP16845634.1
申请日：2016-08-26
发明人： HU, Zhaoping , CHEN, Hongkun , YAO, Hualong , LIU, Yongxiu , LI, Chengzhi , ZHANG, Xixing
IPC分类号： C01F11/46 , C01B25/22 , C01B25/229
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2.发明公开
公开(公告)号：EP3351506A1
公开(公告)日：2018-07-25
申请号：EP16845634.1
申请日：2016-08-26
发明人： HU, Zhaoping , CHEN, Hongkun , YAO, Hualong , LIU, Yongxiu , LI, Chengzhi , ZHANG, Xixing
CPC分类号： C01B25/2295 , C01B25/2204 , C01F11/46 , C01F11/466
摘要： Provided is a method for producing phosphoric acid and at the same time obtaining alpha-hemihydrate gypsum, comprising: adding a phosphate rock powder and a part of dilute sulfuric acid into an extraction tank, carrying out an extraction reaction on same, separating a clear liquid from the obtained mixed slurry, sending the clear liquid, as a finished product phosphoric acid, into an acid storeroom, and transferring a separated solid, together with the rest mixed slurry, into a crystal transformation tank; and adding sulfuric acid and a crystal transformation agent into the crystal transformation tank, carrying out a crystal transformation reaction for 1.5-7.5 h at 60°C-130°C, and solid-liquid separating the obtained mixed acid slurry, wherein the solid can be dried into a gypsum powder, or may be not subjected to a drying step and made into gypsum products such as gypsum boards, gypsum building blocks and gypsum members by directly adding water.
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公开(公告)号：EP3351507A1
公开(公告)日：2018-07-25
申请号：EP16845633.3
申请日：2016-08-26
发明人： HU, Zhaoping , YAO, Hualong , CHEN, Hongkun , PANG, Shihua , LIU, Yongxiu , LI, Chengzhi
IPC分类号： C01B25/231 , C01F11/46
CPC分类号： C01B25/231 , C01F11/46
摘要： Provided is a method for producing wet-process phosphoric acid and by-producing alpha-hemihydrate gypsum and high-purity and high-whiteness alpha-hemihydrate gypsum. The method comprises: adding phosphoric acid and a phosphate rock powder into an extraction tank and conducting an extraction reaction on same, then adding sulfuric acid to continue the reaction so as to make 30%-50% of calcium ions form dihydrate gypsum, the dihydrate gypsum part being sent to a crystal transformation tank, a crystal transformation agent being added, and crystal transformation conditions being controlled so as to obtain 30%-50% of an ordinary alpha-hemihydrate gypsum; and make the other 50%-70% of calcium ions be present in the form of calcium dihydrogen phosphate in a phosphoric acid extractive solution, separating same and then introducing the phosphoric acid extractive solution into a decalcification reaction tank, adding a sulfuric acid solution diluted by a washing solution, and then firstly performing decalcification, and then controlling the crystal transformation conditions and subjecting a solid to a crystal transformation reaction, so as to generate a high-purity and high-whiteness alpha-hemihydrate gypsum. The method not only reduces the content of phosphorus in the by-product alpha-hemihydrate gypsum, but also realizes the industrial production of phosphoric acid and by-products ordinary alpha-hemihydrate gypsum and high-purity and high-whiteness alpha-hemihydrate gypsum by a wet-process.
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