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    • 92. 发明申请
    • PROCESS FOR THE PREPARATION OF A SULFATE- AND HYDROXIDE-BASED FERRIC COMPOUND
    • 制备基于硫酸和氢氧化物的菲律化合物的方法
    • WO1995018069A1
    • 1995-07-06
    • PCT/FI1994000588
    • 1994-12-29
    • KEMIRA OYJÄFVERSTRÖM, StefanTUOMARLA, JuhaniKENAKKALA, Timo
    • KEMIRA OY
    • C01G49/14
    • C01G49/009C01G49/10C01G49/14C01P2006/80
    • The invention relates to a process for the preparation of a pure and solid, sulfate- and hydroxide-based ferric compound such as ferric hydroxysulfate or sodium jarosite, the process comprising the following procedures: a) a sulfate- and/or chloride-based ferric salt is prepared, b) an acidic aqueous solution is prepared which comprises either sulfate ions and ferric ions or sulfate, chloride and ferric ions, c) the acidic aqueous solution is maintained for 2-12 h at a temperature of 60-220 DEG C for the production of a solid, sulfate- and hydroxide-based ferric compound, such as ferric hydroxysulfate or sodium jarosite, by hydrolysis, and d) the pure and solid sulfate- and hydroxide-based ferric compound, such as ferric hydroxysulfate or sodium jarosite, is separated from the acidic aqueous solution. The processes for the preparation of ferric hydroxysulfate and sodium jarosite differ substantially only in that in the preparation of sodium jarosite an acid aqueous solution is prepared which, in addition to the either sulfate and ferric ions or sulfate, chloride and ferric ions, also contains a water-soluble sodium compound, in which case sodium jarosite is formed instead of ferric hydroxysulfate in the hydrolysis of point c) of the process.
    • 本发明涉及一种制备纯的和固体的基于硫酸盐和氢氧化物的三价铁化合物如羟基硫酸铁或钠黄钾铁矾的方法,该方法包括以下步骤:a)基于硫酸盐和/或氯化物的三价铁 制备盐,b)制备酸性水溶液,其包含硫酸根离子和三价铁离子或硫酸盐,氯化物和铁离子,c)酸性水溶液在60-220℃的温度下保持2-12小时 用于通过水解制备固体,基于硫酸盐和氢氧化物的三价铁化合物,例如氢氧化铁硫酸盐或钠黄钾铁矾,以及d)纯的和固体硫酸盐和氢氧化物的三价铁化合物,例如硫酸铁和氢氧化钠黄钾铁矾 与酸性水溶液分离。 用于制备羟基硫酸铁和钠黄钾铁矾的方法不同之处在于制备钠黄钾铁矾时,制备酸性水溶液,除了硫酸盐和铁离子或硫酸盐,氯化物和铁离子之外,还含有 水溶性钠化合物,在这种情况下,在步骤c)的水解中形成钠黄钾铁矾而不是硫酸铁。
    • 96. 发明申请
    • PROCESS FOR PRODUCING PAPER
    • 生产纸的方法
    • WO1993014263A1
    • 1993-07-22
    • PCT/FI1993000019
    • 1993-01-20
    • KEMIRA OYPETANDER, Lars, HaraldDUVNÄS, Tore, Anders, Johan
    • KEMIRA OY
    • D21H21/10
    • D21H21/10D21H17/375D21H17/455D21H17/55D21H17/56D21H17/66D21H23/14
    • The invention relates to a process for the production of paper by adding to an aqueous fiber suspension, which possibly contains a filler, auxiliary agents for improving retention and/or dewatering, the auxiliary agents being a cationic long-chain polyacrylamide and an aluminum salt, and by dewatering the obtained fiber suspension during the sheet-forming stage. According to the invention, the said aqueous fiber suspension, possibly containing a filler, to which the cationic long-chain polyacrylamide has first been added, is subjected to shearing forces, whereafter there is added to it, directly before sheet forming, a polymeric aluminum salt or an aluminum salt, in which case a base or an acid is added, when necessary, to the said fiber suspension so that the pH be within the range 7-9 before the sheet forming, in which case aluminum hydroxy particles having anionic surface charges will be formed in situ.
    • 本发明涉及通过添加可能含有填料的水性纤维悬浮液,用于改善保留和/或脱水的辅助剂,作为阳离子长链聚丙烯酰胺和铝盐的助剂来生产纸的方法, 并且在片材成型阶段中使所得到的纤维悬浮液脱水。 根据本发明,可以含有首先加入阳离子长链聚丙烯酰胺的填料的所述水性纤维悬浮液经受剪切力,然后直接在片材成型之前加入聚合物铝 盐或铝盐,在这种情况下,必要时加入碱或酸加入到所述纤维悬浮液中,使得pH在片材形成之前在7-9范围内,在这种情况下,具有阴离子表面的铝羟基颗粒 收费将在原地形成。