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    PROCEDE DE PRODUCTION D'ACIDE PHOSPHORIQUE DU TYPE DIHYDRATE/HEMIHYDRATE
    3.
    发明公开
    PROCEDE DE PRODUCTION D'ACIDE PHOSPHORIQUE DU TYPE DIHYDRATE/HEMIHYDRATE 有权
    DIHYDRATE型半水用于生产PHOSPHORIC

    公开(公告)号：EP2714589A1

    公开(公告)日：2014-04-09

    申请号：EP11723949.1

    申请日：2011-06-01

    申请人： Prayon Technologies

    发明人： HOXHA, Antoine ,  FATI, Dorina

    IPC分类号： C01B25/231

    CPC分类号： C01B25/222 ,  C01B25/228 ,  C01B25/231

    摘要： The invention relates to a process for producing phosphoric acid, including etching, in an aqueous medium, phosphate rock using sulfuric acid, resulting in the formation of a first dihydrate slurry, in suspension in an aqueous phase, having a free P
    2 O
    5 content of between 38 and 50% and a free SO
    3 content lower than 0.5%, converting said first slurry by means of heating, resulting in the recrystallization of the solubilized calcium sulfate so as to obtain a second hemihydrate slurry, and separating the second slurry into industrial phosphoric acid and a hemihydrate cake, characterized in that said process includes, during the etching, adding a fluorine source into the first slurry with a content of 1 to 5 wt % of F relative to the P
    2 O
    5 contained in the phosphate rock.

    METHOD FOR PRODUCING WET-PROCESS PHOSPHORIC ACID AND BY-PRODUCING ALPHA-HEMIHYDRATE GYPSUM AND HIGH-PURITY AND HIGH-WHITENESS ALPHA-HEMIHYDRATE GYPSUM
    4.
    发明公开
    METHOD FOR PRODUCING WET-PROCESS PHOSPHORIC ACID AND BY-PRODUCING ALPHA-HEMIHYDRATE GYPSUM AND HIGH-PURITY AND HIGH-WHITENESS ALPHA-HEMIHYDRATE GYPSUM 审中-公开

    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

    申请人： Kingenta Norsterra Chemical Co., Ltd.

    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.

    PROCEDE DE PRODUCTION D'ACIDE PHOSPHORIQUE
    6.
    发明公开
    PROCEDE DE PRODUCTION D'ACIDE PHOSPHORIQUE 有权
    用于生产PHOSPHORIC

    公开(公告)号：EP2507168A1

    公开(公告)日：2012-10-10

    申请号：EP10787103.0

    申请日：2010-12-02

    申请人： Prayon Technologies

    发明人： HOXHA, Antoine ,  FATI, Dorina

    IPC分类号： C01B25/231

    CPC分类号： C01B25/231 ,  C01B25/228

    摘要： The invention relates to a method for producing phosphoric acid, including: attacking phosphate rock by means of sulfuric acid between 70º and 90º C with formation of a first calcium sulfate dihydrate crystal slurry, the aqueous acid phase of said slurry having free P
    2 O
    5 content between 38 and 50 wt% and free SO
    3 content that is less than 0.5 wt% and greater than 0.05 wt%; converting said first slurry by means of heating at a temperature greater than 90º C, thus giving rise to a second slurry formed of calcium sulfate hemihydrate crystals; and, within the second slurry, separating a produced phosphoric acid, having a free SO
    3 content that is less than 2%, and a calcium sulfate hemihydrate filter cake.