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1. 发明申请

WO1993022238A1 PROCESS FOR THE EXTRACTION OF ALUMINA 审中-公开
标题翻译：提取氧化铝的方法
公开(公告)号：WO1993022238A1
公开(公告)日：1993-11-11
申请号：PCT/EP1993000999
申请日：1993-04-26
申请人： ALCAN INTERNATIONAL LIMITED , ALUMINA ESPANOLA S.A. , ALVARADO-CENDAN, Jose Manuel , VERGHESE, Kachappillil, Ittoop
发明人： ALCAN INTERNATIONAL LIMITED , ALUMINA ESPANOLA S.A.
IPC分类号： C01F07/06
CPC分类号： C01F7/062
摘要： This invention relates to a process for the extraction of alumina from alumina-containing solid material, particularly the alumina-containing ores known as bauxite. The process comprises: a) providing the material in the form of a slurry (101) in an alkaline solution having a concentration of free caustic therein sufficient at the temperature reached in step (c) to dissolve alumina values, b) classifying (6) the slurry into a fine particle fraction and a coarse particle fraction, c) heating the fine particle fraction (105) to a temperature sufficient to dissolve at least some of the alumina values therein with consequential reduction in the free caustic concentration in the liquid phase of the fine fraction slurry, and d) combining the coarse particle fraction (109) from step (b) with the free caustic-depleted slurry liquid from step (c) at a temperature higher than that reached in the step (c) so as to dissolve at least some of the alumina values in the coarse particle fraction.
摘要翻译：本发明涉及从含氧化铝的固体材料，特别是称为铝土矿的含氧化铝矿石中提取氧化铝的方法。该方法包括：a）以在步骤（c）中达到的温度足够的碱性溶液在碱性溶液中提供浆料（101）形式的材料以溶解氧化铝值，b）分级（6）将浆料分散成细颗粒部分和粗颗粒部分，c）将细颗粒部分（105）加热到足以溶解至少一些氧化铝值的温度，从而降低液相中的游离碱浓度所述细级浆料，和d）在步骤（c）中将步骤（b）的粗颗粒组分（109）与步骤（c）中的游离苛性碱贫化浆液以高于步骤（c）中达到的温度混合，溶解粗颗粒部分中的至少一些氧化铝值。

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