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    Process for continuous production of aqueous basic aluminum salt solutions
    1.
    发明授权
    Process for continuous production of aqueous basic aluminum salt solutions 失效
    连续生产碱性铝盐水溶液的方法

    公开(公告)号：US3957947A

    公开(公告)日：1976-05-18

    申请号：US445605

    申请日：1974-02-25

    申请人： Koichi Yamada ,  Masao Yoshihara ,  Hisakatsu Kato

    发明人： Koichi Yamada ,  Masao Yoshihara ,  Hisakatsu Kato

    IPC分类号： C01F7/56 ,  C01F7/66 ,  C01F7/00

    CPC分类号： C01F7/66 ,  C01F7/56

    摘要： An aqueous basic aluminum salt high in basicity can be continuously produced with a high conversion by passing a slurry of aluminum hydroxide, alumina-containing mineral or a mixture thereof and hydrochloric or nitric acid through a tubular reactor and then reacting the initial stage reaction product with the unreacted alumina in a holding treatment portion provided subsequent to the tubular reactor.

    摘要翻译： 通过使氢氧化铝，含氧化铝的矿物或其混合物的浆料和盐酸或硝酸通过管式反应器，可以通过高转化率连续生产碱性高碱性碱性铝盐，然后使初级反应产物与 在管状反应器之后设置的保持处理部分中的未反应的氧化铝。

    Process for extracting alumina from alumna-containing ores
    2.
    发明授权
    Process for extracting alumina from alumna-containing ores 失效
    从含有矿石的矿石中提取氧化铝的方法

    公开(公告)号：US3997650A

    公开(公告)日：1976-12-14

    申请号：US611155

    申请日：1975-09-08

    申请人： Koichi Yamada ,  Masao Yoshihara ,  Takahiro Ishida

    发明人： Koichi Yamada ,  Masao Yoshihara ,  Takahiro Ishida

    IPC分类号： C01F7/06 ,  C22B21/00

    CPC分类号： C22B21/0007 ,  C01F7/062

    摘要： In a process for extracting alumina from alumina-containing ores by individually preheating a slurry of alumina-containing ores in alkali solution, and an alkali solution, and feeding the preheated slurry and the preheated alkali solution to a digester maintained at a temperature of about 200.degree. to about 300.degree. C, thereby extracting alumina from the alumina-containing ore. The alumina extraction is carried out without any formation of scales on the inside surface of the preheater with a considerably prolonged operating duration by preparing a slurry having a molar ratio of Na.sub.2 O/Al.sub.2 O.sub.3 of not more than 1 from the alumina-containing ores and an alkali solution, subjecting the slurry to preliminary desilication treatment, if necessary, then adding an alkali material to the slurry while preheating the slurry before the slurry reaches a temperature of forming scales originating from deposition of boehmite-type alumina from the slurry, thereby obtaining the slurry having an adjusted molar ratio of Na.sub.2 O/Al.sub.2 O.sub.3 of more than 1, further preheating the slurry having the adjusted molar ratio to a temperature higher than that of forming scales originating from deposition of boehmite-type alumina from the slurry before the adjustment of the molar ratio, and then extracting the alumina from the alumina-containing ores in the slurry admixed with a separately preheated alkali solution in the digester.

    摘要翻译： 在通过在碱溶液中单独预热含氧化铝矿石浆料和碱溶液从含氧化铝的矿石中提取氧化铝的方法中，将预热的浆料和预热的碱溶液供给到保持在约200℃的温度的蒸煮器 DEG至约300℃，从而从含氧化铝的矿石中提取氧化铝。 通过从含氧化铝的矿石和碱制备具有不大于1的Na 2 O / Al 2 O 3的摩尔比的浆料，在预热器的内表面上没有任何形式的氧化铝提取具有相当长的操作持续时间 溶液，如果需要，对浆料进行初步的脱硅处理，然后在浆料达到形成水垢温度的同时在浆料中预先加入碱性物质，然后从浆液中沉积出勃姆石型氧化铝，从而得到浆料 具有大于1的Na 2 O / Al 2 O 3的调节摩尔比，进一步将具有调节摩尔比的浆料预先比在调节摩尔比之前从浆料中形成勃姆石型氧化铝沉积的成分的温度高 ，然后从与单独预热的烷烃混合的浆料中的含氧化铝的矿石中提取氧化铝 ali解决方案在消化池。