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    Process for preparing a metal hydroxide
    1.
    发明公开
    Process for preparing a metal hydroxide 审中-公开
    Verfahren zur Herstellung von Metallhydroxyd

    公开(公告)号：EP1785396A1

    公开(公告)日：2007-05-16

    申请号：EP05077552.7

    申请日：2005-11-09

    申请人： Nederlandse Organisatie voor Toegepast-Natuurwetenschappelijk Onderzoek TNO

    发明人： Brouwer, Jan Peter

    IPC分类号： C01F11/12 ,  C01F5/14 ,  C01B33/187

    CPC分类号： C01B33/187 ,  C01B13/36 ,  C01B33/142 ,  C01F5/14 ,  C01F11/12

    摘要： The invention provides a process for preparing a metal hydroxide comprising the steps of:
    (a) providing particles of a metal silicate;
    (b) mixing the particles with a mineral acid solution to obtain a slurry which comprises precipitated silica;
    (c) separating the precipitated silica from the slurry to obtain a remaining solution;
    (d) increasing the pH of the remaining solution to such an extent that a metal hydroxide is formed; and
    (e) separating the metal hydroxide so obtained from the remaining solution.

    摘要翻译： 本发明提供一种制备金属氢氧化物的方法，包括以下步骤：（a）提供金属硅酸盐的颗粒; （b）将所述颗粒与无机酸溶液混合以获得包含沉淀二氧化硅的浆料; （c）从沉淀物中分离沉淀的二氧化硅以获得剩余的溶液; （d）将剩余溶液的pH提高至形成金属氢氧化物的程度; 和（e）从剩余的溶液中分离得到的金属氢氧化物。

    SILICA SOL
    9.
    发明授权
    SILICA SOL 有权

    公开(公告)号：EP3036192B1

    公开(公告)日：2018-10-03

    申请号：EP14752874.9

    申请日：2014-08-20

    申请人： Akzo Nobel Chemicals International B.V.

    发明人： SANNE, Erik ,  HANSSON, Freddie

    IPC分类号： C01B33/141 ,  C01B33/145 ,  D21H17/37 ,  D21H17/68 ,  D21H21/10

    CPC分类号： C01B33/143 ,  C01B33/14 ,  C01B33/141 ,  C01B33/142 ,  C01B33/145 ,  D21H17/375 ,  D21H17/68 ,  D21H19/40 ,  D21H21/10

    摘要： The present invention relates to a silica sol having a pH above about 10, molar ratio of SiO2:M2O, in which M is alkali metal, of from about 6:1 to about 16:1, concentration of soluble silica above about 3000 mg SiO2/l, and S-value of from about 18 to about 40%. The invention further relates to a process for producing a silica sol which comprises acidifying an aqueous alkali metal silicate solution to a pH of from 1 to 4 to form an acid sol, alkalizing the acid sol by addition of aqueous alkali metal silicate solution to obtain an intermediate sol and interrupt the addition of aqueous alkali metal silicate solution when the intermediate sol has reached a pH of from about 5 to about 8, stirring the intermediate sol for a time period of from about 10 to about 6000 seconds without addition of aqueous alkali metal silicate solution, alkalizing the intermediate sol by addition of aqueous alkali metal silicate solution to obtain a silica sol having a pH above about 10 and molar ratio of SiO2:M2O, in which M is alkali metal, of from about 6:1 to about 16:1, and optionally adding an aluminum compound to the acid sol, intermediate sol or silica sol. The invention further relates to a silica sol obtainable by the process of the invention. The invention further relates to the use of the silica sol as a flocculating agent, in water purification and in producing paper and board. The invention further relates to a process for producing paper and board which comprises: (i) providing an aqueous suspension comprising cellulosic fibers; (ii) adding to the suspension one or more drainage and retention aids comprising the silica sol; and (iii) dewatering the obtained suspension to provide a sheet or web of paper or board.