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1. 发明授权

US4511542A Bayer process production of alumina hydrate 失效
标题翻译：拜耳工艺生产的水合氧化铝
公开(公告)号：US4511542A
公开(公告)日：1985-04-16
申请号：US613701
申请日：1984-05-24
申请人： Joseph L. Anjier , Morris L. Roberson , William E. Atchison
发明人： Joseph L. Anjier , Morris L. Roberson , William E. Atchison
IPC分类号： C01F7/47 , C01F7/14
CPC分类号： C01F7/144 , C01P2004/61
摘要： An improved precipitation system is provided for the Bayer process production of alumina hydrate. In order to produce coarse and strong alumina hydrate at high yield, supersaturated Bayer process sodium aluminate liquor is seeded with a relatively small seed charge in a first precipitator at a relatively low temperature and the produced slurry is transferred to a second precipitator where without additional seeding, the solids content of the slurry is allowed to increase to about 250-700 g/l by accumulating solids in the line until the desired solids content is reached. After a suitable residence time, a coarse, strong product hydrate can be recovered in yields of or exceeding 80 g/l based on the alumina (Al.sub.2 O.sub.3) content of the supersaturated sodium aluminate liquor subjected to precipitation. The process not only produces the desired product at high yield but also, due to the use of a single, small seed charge, the precipitation system requires fewer precipitators and classifiers for a given residence time. Additionally, it allows significant energy savings by eliminating the need for cooling during the precipitation cycle due to the lower than conventional temperatures which can be utilized in the first precipitator.
摘要翻译：提供了一种改进的沉淀系统，用于拜耳工艺生产水合氧化铝。为了以高产率生产粗和强的氧化铝水合物，过饱和的拜耳法铝酸钠液体在相对较低的温度下在第一除尘器中以相对小的种子电荷接种，并且将所产生的浆料转移到第二除尘器，其中没有另外的接种，通过在管线中积聚固体使浆料的固体含量增加到约250-700g / l，直到达到所需的固体含量。在合适的停留时间后，基于经过沉淀的过饱和铝酸钠溶液的氧化铝（Al 2 O 3）含量，可以以80g / l的产率回收粗大的强产品水合物。该方法不仅以高产率产生所需产物，而且由于使用单一的小种子电荷，沉淀系统在给定的停留时间内需要更少的除尘器和分级器。另外，由于低于可在第一除尘器中使用的常规温度，因此通过消除在降水循环期间的冷却需要，可以显着节省能源。

2. 发明授权

US4663133A Removal of high molecular weight organic compounds from Bayer process caustic liquor 失效
标题翻译：从拜耳工艺苛性液体中除去高分子量有机化合物
公开(公告)号：US4663133A
公开(公告)日：1987-05-05
申请号：US773265
申请日：1985-09-06
申请人： John T. Malito , Morris L. Roberson
发明人： John T. Malito , Morris L. Roberson
IPC分类号： C01F7/47 , C01F7/06
CPC分类号： C01F7/476
摘要： High molecular weight organic compounds, such as humic acid derivatives, are removed from Bayer process caustic liquors by oxidation of these compounds. The process involves addition of oxygen to the caustic liquor in quantities in the range established by the solubility of the oxygen in the liquor under the oxidation conditions.
摘要翻译：通过这些化合物的氧化，从拜耳法苛性液体中除去高分子量的有机化合物如腐殖酸衍生物。该方法包括在碱性溶液中以氧化条件下氧气在液体中的溶解度确定的量加入氧气。

3. 发明授权

US4036931A Bayer process production of alumina 失效
标题翻译：拜耳工艺生产氧化铝
公开(公告)号：US4036931A
公开(公告)日：1977-07-19
申请号：US699828
申请日：1976-06-25
申请人： Morris L. Roberson , John W. Beck , Jack S. Maples , Anthony Savariste , Donald J. Donaldson , David L. Stein , Allan C. Kelly
发明人： Morris L. Roberson , John W. Beck , Jack S. Maples , Anthony Savariste , Donald J. Donaldson , David L. Stein , Allan C. Kelly
IPC分类号： C01F7/08 , C01F7/00 , C01F7/14 , C01F7/47 , C01F7/06
CPC分类号： C01F7/004 , C01F7/47 , C01F7/473 , Y10S210/919
摘要： A process is provided which allows control of the impurity level of Bayer process streams with simultaneous generation of an environmentally acceptable effluent and recovery of valuable dissolved aluminum and sodium values. The process involves carbonation of a blow-down stream at 40.degree.-100.degree. C to produce sodium dawsonite [NaAl(OH).sub.2 CO.sub.2 ] and an effluent essentially free of dissolved alumina and significantly depleted in dissolved sodium. The sodium dawsonite can be used as such or returned to the Bayer process after thermal decomposition to sodium aluminate. The effluent can be directly discharged into natural receiving bodies without further treatment.
摘要翻译：提供了一种方法，其允许通过同时产生环境可接受的流出物和回收有价值的溶解的铝和钠值来控制拜耳工艺流的杂质水平。该方法包括在40°-100℃下将吹入气体碳酸化以产生钠钙铝钠（NaAl（OH）2 CO 2），基本上不含溶解的氧化铝的流出物，并且溶解的钠明显耗尽。片钠铝酸钠可以原样使用，或在热分解成铝酸钠后返回到拜耳法。流出物可以直接排放到自然接收体中，无需进一步处理。

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