公开(公告)号：WO1991001950A1

公开(公告)日：1991-02-21

申请号：PCT/CA1990000235

申请日：1990-07-26

Applicant: ALCAN INTERNATIONAL LIMITED

Inventor： ALCAN INTERNATIONAL LIMITED ,  DUBE, Ghyslain ,  CHAUVETTE, Gaetan

IPC: C03C13/06

CPC classification number: C03C13/06

Abstract: A process for producing mineral fibers and the fibers thus produced are disclosed. The process involves forming a melt comprising an alumina-containing residue from a metal melting operation and one or more mineral raw materials suitable for forming mineral fibers, dividing the melt into streams and cooling the streams to produce the fibers. The residue from the metal melting operation acts as an inexpensive, substantially non-polluting source of alumina which can be used to increase the alumina content of the fibers and thus improve their properties, or which can be used as a replacement for more expensive or less desirable sources of alumina.

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

Applicant: ALCAN INTERNATIONAL LIMITED

Inventor： ALCAN INTERNATIONAL LIMITED ,  CHAUVETTE, Gaetan ,  KIMMERLE, Frank, M. ,  ROUSSEL, Roger

IPC: C22B21/00

CPC classification number: C22B21/0023 ,  C01C1/04 ,  C01F7/0693 ,  C22B7/04 ,  C22B21/0007 ,  C22B21/0069 ,  Y02P10/234

Abstract: 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.

Abstract translation: 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。