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公开(公告)号：US4130402A
公开(公告)日：1978-12-19
申请号：US800046
申请日：1977-05-24
CPC分类号： C09K3/1418 , C01F7/442 , C04B35/10 , C01P2004/61 , C01P2004/62 , C01P2006/12
摘要： Coarsely crystalline aluminum oxide is provided which contains the following trace elements: V.sub.2 O.sub.5 > 0.005 percent by weight, P.sub.2 O.sub.5 > 0.005 percent by weight, Na.sub.2 O > 0.8 percent by weight.A method is provided for producing such an aluminum oxide by calcining aluminum hydroxide in the presence of at least one flouride and of vanadium salt.
摘要翻译： 提供了粗结晶氧化铝，其含有以下微量元素：V 2 O 5> 0.005重量％，P 2 O 5> 0.005重量％，Na 2 O> 0.8重量％。
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2.发明授权Method for removing harmful organic compounds from aluminate liquors of the Bayer process 失效从拜耳法的铝酸盐液中除去有害有机化合物的方法
公开(公告)号：US4046855A
公开(公告)日：1977-09-06
申请号：US676883
申请日：1976-04-14
申请人： Bernhard Schepers , Gerhard Bayer , Ernst Urmann , Klaus Schanz
发明人： Bernhard Schepers , Gerhard Bayer , Ernst Urmann , Klaus Schanz
CPC分类号： C01F7/473
摘要： A method is provided for removing harmful organic compounds from the aluminate liquor obtained in the production of alumina according to the Bayer process. A magnesium obtained is added to the aluminate liquor to form a hydroxide mixture containing magnesium hydroxide and aluminum hydroxide which precipitates from the aluminate liquor. The precipitated mixture is maintained in the aluminate liquor, while being stirred, until at least a part of the organic compounds have been eliminated from the aluminate liquor. The hydroxide mixture containing the organic compounds then is separated from the aluminate liquor.
摘要翻译： 提供了一种根据拜耳法从氧化铝生产中获得的铝酸盐溶液中除去有害有机化合物的方法。 将获得的镁加入到铝酸盐溶液中以形成氢氧化铝混合物，其中含有从铝酸盐液中析出的氢氧化镁和氢氧化铝。 将沉淀的混合物在搅拌下保持在铝酸盐溶液中，直到至少一部分有机化合物已从铝酸盐液体中除去。 然后将含有有机化合物的氢氧化物混合物与铝酸盐液体分离。
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公开(公告)号：US4374119A
公开(公告)日：1983-02-15
申请号：US302555
申请日：1981-09-16
CPC分类号： C01F7/442 , C09K3/1409 , C01P2004/50 , C01P2004/54 , C01P2004/60 , C01P2004/61
摘要： The invention describes a process for the production of coarse crystalline alumina from aluminum hydroxide, which after preparation by known methods is advantageously useful for abrasives, lapping and polishing purposes or for refractory materials. The process is characterized by aluminum hydroxide, either directly or after previous partial dehydration in the range 200.degree.-550.degree. C., being added with a mineralizer of compound type x(BF.sub.4).sub.n, wherein x stands for NH.sub.4 and metallic elements and n is for the formal valence of x, and subsequently is subjected to an elevated temperature treatment between 750.degree. C. and a value higher than the phase change temperature to .alpha.-Al.sub.2 O.sub.3.
摘要翻译： 本发明描述了一种由氢氧化铝生产粗结晶氧化铝的方法，其在通过已知方法制备之后有利于研磨剂，研磨和抛光目的或耐火材料。 该方法的特征在于氢氧化铝，直接或先前部分脱水在200〜-550℃范围内，加入x（BF 4）n化合物的矿化剂，其中x代表NH4和金属元素，n 是用于x的正式化合价，随后在750℃和相对于α-Al 2 O 3的相变温度高的温度下进行高温处理。
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公开(公告)号：US4487756A
公开(公告)日：1984-12-11
申请号：US522684
申请日：1983-08-12
CPC分类号： C01F7/442 , C09K3/1409 , C01P2002/01 , C01P2004/54
摘要： The invention relates to a process for manufacturing crystalline alumina from aluminum hydroxide which after further conventional treatment is advantageously suitable for ceramic and refractory purposes or as a lapping and polishing agent. The process is such that aluminum hydroxide with a Na.sub.2 O content of .ltoreq.0.1 wt. % with respect to Al.sub.2 O.sub.3 is subjected either directly or after prior partial dehydration to a thermal treatment above the temperature for transformation to .alpha.--Al.sub.2 O.sub.3. The aluminum hydroxide has an addition of an ammonium containing mineralizer made to it, simultaneously in the presence of boron and/or fluorine, in particular an addition of NH.sub.4 BF.sub.4. The product is characterized by way of the essentially isometric shape of the single crystals.
摘要翻译： 本发明涉及由氢氧化铝制造结晶氧化铝的方法，其进一步的常规处理有利地适用于陶瓷和耐火材料目的，或作为研磨抛光剂。 该方法使得具有Na2O含量
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