公开(公告)号：US3622271A

公开(公告)日：1971-11-23

申请号：US3622271D

申请日：1968-11-21

申请人： REYNOLDS METALS CO

发明人： KELLY DONALD H ,  BRUEN CHARLES P

IPC分类号： C01F7/30 ,  C01F7/02 ,  C01F7/66

CPC分类号： C01F7/308 ,  C01P2004/34 ,  C01P2004/50 ,  C01P2006/10 ,  C01P2006/80 ,  C01P2006/82

摘要： Process for preparing a precalcined alumina of low residual nitrate content, suitable for calcining to alpha alumina, which comprises maintaining a basic aluminum nitrate prepared by heating molten aluminum nitrate nonahydrate to a temperature above its decomposition temperature but not above 230* C. under superatmospheric pressure, while removing gaseous nitric acid decomposition products, until between 45 percent and about 60 percent of the HNO3 of the aluminum nitrate nonahydrate has been removed, followed by reduction of said pressure to at least as low as atmospheric pressure, said basic aluminum nitrate being of controlled free alumina content and in particulate form in a fluidized bed at temperatures of at least about 470* C. for a period sufficient to reduce the residual N2O5 content to a value of not more than about 0.02 mole or N2O5 per mole of alumina, Al2O3.

公开(公告)号：US3925538A

公开(公告)日：1975-12-09

申请号：US52138174

申请日：1974-11-06

申请人： REYNOLDS METALS CO

发明人： BRUEN CHARLES P ,  KELLY DONALD H

IPC分类号： C01F7/30 ,  C01F7/66 ,  C01B21/42

CPC分类号： C01F7/66 ,  C01F7/308

摘要： Process for producing alumina monohydrate and aluminum nitrate from basic aluminum nitrates by preparing an aqueous solution of the basic aluminum nitrate having a nitrate concentration low enough to prevent solution of Al2O3, heating the solution under autogenous pressure to convert the free alumina in the basic aluminum nitrate to solid alumina monohydrate, and recovering the solid alumina monohydrate.

公开(公告)号：US3864462A

公开(公告)日：1975-02-04

申请号：US4891970

申请日：1970-06-18

申请人： REYNOLDS METALS CO

发明人： BRUEN CHARLES P ,  KELLY DONALD H

IPC分类号： C01F7/30 ,  C01F7/02

CPC分类号： C01F7/308 ,  C01P2004/61 ,  C01P2006/80

摘要： Process for producing alumina monohydrate and aluminum nitrate from basic aluminum nitrates by preparing an aqueous solution of the basic aluminum nitrate having a nitrate concentration low enough to prevent solution of Al2O3, heating the solution under autogenous pressure to convert the free alumina in the basic aluminum nitrate to solid alumina monohydrate, and recovering the solid alumina monohydrate.

摘要翻译： 通过制备具有足够低的硝酸盐浓度以防止Al2O3溶液的碱式硝酸铝的​​水溶液，从碱式硝酸铝生产氧化铝一水合物和硝酸铝的方法，在自生压力下加热溶液以将碱式硝酸铝中的游离氧化铝 固体氧化铝一水合物，并回收固体氧化铝一水合物。