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2. 发明申请

WO1991009978A1 PROCESS FOR CONVERTING DROSS RESIDUES TO USEFUL PRODUCTS 审中-公开
标题翻译：将废弃物转化为有用的产品的方法
公开(公告)号：WO1991009978A1
公开(公告)日：1991-07-11
申请号：PCT/CA1990000454
申请日：1990-12-24
申请人： ALCAN INTERNATIONAL LIMITED
发明人： ALCAN INTERNATIONAL LIMITED , CHAUVETTE, Gaetan , KIMMERLE, Frank, M. , ROUSSEL, Roger
IPC分类号： C22B21/00
CPC分类号： C22B21/0023 , C01C1/04 , C01F7/0693 , C22B7/04 , C22B21/0007 , C22B21/0069 , Y02P10/234
摘要： A process for converting dross residues having an aluminum nitride content of at least 5 wt % and a metallic aluminum content of no more than 10 wt % ( particularly plasma dross residues) to useful products. The process comprises treating the dross residues with a solution having a pH of 7 or more, the reaction at alkaline pH values being AlN + 4H2O -> Al(OH)3 + NH4 + OH followed by: Al(OH)3 + OH -> Al2O + 2H2O and NH4 + OH -> NH3 + H2O. The initial treatment of the dross residues may be under mild conditions to generate ammonia from the nitride. The ammonia can be collected as a useful product or converted to other useful products such as ammonium salts. Under harsher conditions, e.g. elevated temperature and pressure with caustic alkalis, a substantial portion of the dross residue dissolves to form an alkali metal aluminate solution which is itself a useful product (e.g. it can be used in the Bayer process) or can be converted into other useful products such as aluminum trihydrate. A portion of the dross residue normally remains undissolved and this can also be a useful product, e.g. a refractory precursor, or may be disposed of by dumping since it is non-polluting.
摘要翻译：将具有至少5重量％的氮化铝含量和不超过10重量％的金属铝含量（特别是等离子体杂质残渣）的渣渣转化成有用的产品的方法。该方法包括用pH为7或更高的溶液处理渣渣，碱性pH值为AlN + 4H 2 O→Al（OH）3 + NH 4 + OH→的反应，随后为：Al OH）3 + OH→Al 2 O + + 2H 2 O和NH 4 + + OH→NH 3 + H 2 O。渣渣残留物的初始处理可能处于温和条件下，从氮化物产生氨。可以将氨作为有用的产物收集或转化成其它有用的产物如铵盐。在更苛刻的条件下，例如升高的温度和压力与苛性碱，大部分的浮渣残留物溶解形成碱金属铝酸盐溶液本身是有用的产品（例如它可以用于拜耳法）或可以转化成其他有用的产品，如三水合铝。一部分浮渣残渣通常保持不溶，这也可以是有用的产物，例如，耐火材料前体，或者可以通过倾倒处理，因为它是无污染的。

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