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    Process for the reduction of the sodium hydroxide losses of the Bayer-type alumina production
    3.
    发明授权
    Process for the reduction of the sodium hydroxide losses of the Bayer-type alumina production 失效
    降低拜耳型氧化铝生产的氢氧化钠损失的方法

    公开(公告)号：US4486393A

    公开(公告)日：1984-12-04

    申请号：US469140

    申请日：1983-02-23

    申请人： Gyorgy Baksa ,  Jozsef Boros ,  Gyula Horvath ,  Balazs Ihasz ,  Zoltan Pais ,  Matyas Rainiss ,  Ferenc Sitkei ,  Karoly Solymar ,  Bela Toth ,  Ferenc Vallo ,  Istvan Voros ,  Maria Orban nee Kelemen ,  Jozsef Zoldi

    发明人： Gyorgy Baksa ,  Jozsef Boros ,  Gyula Horvath ,  Balazs Ihasz ,  Zoltan Pais ,  Matyas Rainiss ,  Ferenc Sitkei ,  Karoly Solymar ,  Bela Toth ,  Ferenc Vallo ,  Istvan Voros ,  Maria Orban nee Kelemen ,  Jozsef Zoldi

    IPC分类号： C01F7/06

    CPC分类号： C01F7/066

    摘要： The invention relates to a process for the reduction of sodium hydroxide losses of the Bayer-cycle by modified causticization of red mud which comprisessubjecting an optionally previously concentrated red mud slurry led off from the red mud washing line by ramification and containing a liquid phase which has a concentration of 5-40 g. caustic Na.sub.2 0/1. caustification by adjusting the lime content expressed as CaO through addition of lime or lime milk to 1-3.2 moles per mole Al.sub.2 O.sub.3, preferably to 2-2.5 moles per mole Al.sub.2 O.sub.3, related to the total Al.sub.2 O.sub.3 content of the slurry;stirring the slurry for 0.3-5 hours at a temperature of 70.degree.-110.degree. C., preferably at 80.degree.-100.degree. C.;adding to the slurry 3-4 moles, preferably 3.2-3.4 moles, of soda related to 1 mole of the originally dissolved Al.sub.2 O.sub.3, and continuing the stirring for 1-4 hours at 80.degree.-100.degree. C., preferably at a temperature of 90.degree.-95.degree. C.;if necessary causticizing the excess of soda by adding lime or lime milk by methods known per se;if desired concentrating the slurry thus obtained and re-introducing the liquid phase thereof to the red mud washing unit which corresponds to the sodium hydroxide content thereof;and re-entering the slurry to the red mud washing line.The advantages of the process of the present invention are as follows: the sodium hydroxide losses of different origin of Bayer-type alumina production are recovered by a single operation step, the process is simple, requires no expensive equipment and is economical.

    摘要翻译： 本发明涉及通过红泥的改性苛化来降低拜耳 - 循环的氢氧化钠损失的方法，该方法包括将由红泥浆清洗线引出的任选预先浓缩的红泥浆经分散和含有液相 浓度为5-40g。 苛性钠Na20 / 1。 通过将石灰或石灰乳添加为1-3.2摩尔/摩尔Al 2 O 3，优选为2-2.5摩尔/摩尔Al 2 O 3，通过调整CaO表示的石灰含量与浆料的总Al 2 O 3含量相关; 在70-110℃，优选在80℃-100℃下搅拌该浆料0.3-5小时。 向浆料中加入3-4摩尔，优选3.2-3.4摩尔与1摩尔原始溶解的Al 2 O 3有关的苏打，并在80℃-100℃下，优选在 90°-95℃。 如果需要，通过本身已知的方法加入石灰或石灰乳来苛化苏打水; 如果需要浓缩由此获得的浆料并将其液相再引入对应于其氢氧化钠含量的红泥洗涤单元; 并将浆料重新进入红泥清洗线。 本发明方法的优点如下：通过单一操作步骤回收拜耳式氧化铝生产不同来源的氢氧化钠损失，工艺简单，不需要昂贵的设备，而且经济。