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    PRODUCTION OF PHOSPHATE COMPOUNDS FROM MATERIALS CONTAINING PHOSPHORUS AND AT LEAST ONE OF IRON AND ALUMINIUM
    5.
    发明公开
    PRODUCTION OF PHOSPHATE COMPOUNDS FROM MATERIALS CONTAINING PHOSPHORUS AND AT LEAST ONE OF IRON AND ALUMINIUM 审中-公开
    磷酸盐化合物的产量从含磷材料和铁中的至少一个铝

    公开(公告)号：EP2991935A1

    公开(公告)日：2016-03-09

    申请号：EP14791380.0

    申请日：2014-05-02

    申请人： Easymining Sweden AB

    发明人： COHEN, Yariv ,  ENFÄLT, Patrik

    IPC分类号： C02F11/00 ,  C01B25/22 ,  C01B25/238 ,  C01B25/46 ,  C05B11/12 ,  C05B11/16 ,  C05F7/00

    摘要： A method for concentration of phosphate compounds comprises dissolving (205) of sludge ash in hydrochloric acid. Insoluble residues are separated (210), thereby forming a first leach solution. A mole ratio of phosphorus to a sum of ferric iron and aluminum in the first leach solution is controlled (215) to be larger than 1. A base is added (220) to the first leach solution in an amount causing precipitation of phosphate compounds. The precipitated phosphate compounds are removed (225) from the first leach solution. Sulphuric acid is added (240) to the first leach solution, causing precipitation of sulphate compounds. The precipitated sulphate compounds are separated (245) from the first leach solution. At least a part of the leach solution is recycled (248) as the hydrochloric acid used for the dissolving of sludge ash. Further methods for processing the precipitated phosphate compounds are presented as well as arrangements for performing the methods.

    摘要翻译： 一种用于磷酸盐化合物的浓度的方法包括泥灰的溶解（205）中的盐酸。 不溶残渣分离（210），由此形成第一浸出溶液。 与三价铁和铝的总和在第一浸出溶液磷的摩尔比被控制（215）为大于1，一种碱加入（220）到在量曹景伟磷酸盐化合物的沉淀第一浸出溶液大。 除去沉淀的磷酸盐化合物（225）从第一浸提溶液。 加入硫酸（240）到所述第一沥滤溶液，引起硫酸盐化合物的沉淀。 将沉淀的硫酸化合物中分离（245）从第一浸提溶液。 至少所述浸提溶液的一部分被再循环（248）作为用于泥灰的溶解的盐酸。 用于处理所述沉淀的磷酸盐化合物的另外的方法被呈现以及用于执行所述方法的布置。

    Purification of phosphoric acid rich streams
    6.
    发明公开
    Purification of phosphoric acid rich streams 有权
    清洗磷丰富的流

    公开(公告)号：EP1970349A3

    公开(公告)日：2009-09-02

    申请号：EP08152753.3

    申请日：2008-03-14

    申请人： NIRO Process Technology B.V.

    发明人： Scholz, Reinhard Uwe ,  Ruemekorf, Ray Sircy

    IPC分类号： C01B25/234 ,  C01B25/238

    CPC分类号： C01B25/234 ,  C01B25/238

    摘要： The invention relates to a method for the purification or recovery of orthophosphoric acid rich streams by suspension-based melt crystallization. The orthophosphoric acid is crystallized as the hemi-hydrate form and subsequent separation of such crystals in a wash-column produce a high purity acid/water solution that has been depleted of most of the metals and impurities other than water, thereby separating an orthophosphoric acid rich feed liquor into an ultra-pure orthophosphoric acid hemi-hydrate and a mother liquor containing almost all impurities originally present in the feed. The orthophosphoric acid rich feed liquor typically contains no more than 15wt% water and 1wt% other impurities. Individual metal ion composition in the purified orthophosphoric acid product is in the range of 100 to1000 ppb (parts per billion = 1/1000 ppm) of each metal ion. The metal ion composition of the resulting purified product is thus typically below the detection limit of typical analysis equipment.

    Process for purifying phosphoric acid
    9.
    发明公开
    Process for purifying phosphoric acid 失效
    用于净化磷酸的方法

    公开(公告)号：EP0298948A3

    公开(公告)日：1989-02-22

    申请号：EP88890169.1

    申请日：1988-06-29

    申请人： FMC Corporation

    发明人： Dore, Jeffrey C. ,  Brochu, David P. ,  Hall, Richard E.

    IPC分类号： C01B25/238 ,  C01B25/46

    CPC分类号： C01B25/465 ,  C01B25/461

    摘要： The invention is a process to purify a solution of phosphoric acid by removing transition metal impurities such as iron, chromium and vanadium. In the process a solution of phosphoric acid in an organic solvent which is substantially immiscible with water is contacted with an aqueous solution of a salt of an alkali metal of phosphoric acid. The phosphoric acid recovered following the contacting contains a substantially lesser content of transition metal impurities.