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1. 发明申请

WO2005035445A3 METHOD FOR REDUCING FOULING OF HEAT EXCHANGERS IN A BAYER CIRCUIT 审中-公开
标题翻译：减少热交换器在贝叶斯电路中发生故障的方法
公开(公告)号：WO2005035445A3
公开(公告)日：2006-06-22
申请号：PCT/FR2004002538
申请日：2004-10-08
申请人： PECHINEY ALUMINIUM , CRISTOL BENOIT , ESQUERRE VALERIE
发明人： CRISTOL BENOIT , ESQUERRE VALERIE
IPC分类号： C01F7/06
CPC分类号： C01F7/0606
摘要： The invention relates to a Bayer process for the production of aluminium trihydrate comprising: a) a milling step (B) for the bauxite (10), b) a step of digestion (A) of said bauxite by a sodium aluminate liquor, c) a liquid/solid separation step (C and F), d) a decomposition step (D) for said supersaturated aluminate liquor e) after separation of the precipitated aluminium trihydrate (30), a step of concentration (E) by evaporation of said sodium aluminate liquor for recycling as digestion liquor, said process being characterised in that a calcium based compound (11, 111, 11', 111'), belonging to the group of tricalcinated aluminates, is introduced into said sodium aluminate liquor. The introduction of said calcium compound into the aluminate liquor is carried out between the exit thereof from the decomposition chain and the mixing thereof with the milled bauxite upstream of a heat exchanger.
摘要翻译：本发明涉及一种用于生产三水合铝的拜耳法，其包括：a）用于铝土矿（10）的研磨步骤（B），b）通过铝酸钠液体消化（A）所述铝土矿的步骤，c）液体/固体分离步骤（C和F），d）用于所述过饱和铝酸盐液体的分解步骤（D）e）在分离沉淀的三水合铝（30）之后，通过蒸发所述钠铝酸盐液体作为消化液再循环，所述方法的特征在于将属于三氯化铝酸盐的钙基化合物（11,111,11'，111'）引入所述铝酸钠液体中。所述钙化合物在铝酸盐液中的引入在其分解链的出口和与热交换器上游的碾磨的铝土矿的混合之间进行。

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