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1. 发明授权

US3998927A Recovery of sodium aluminate from high-silica aluminous materials 失效
标题翻译：从高硅铝质材料回收铝酸钠
公开(公告)号：US3998927A
公开(公告)日：1976-12-21
申请号：US623930
申请日：1975-10-20
申请人： Lawrence Keith Hudson , Thomas G. Swansiger
发明人： Lawrence Keith Hudson , Thomas G. Swansiger
IPC分类号： C01F7/06
CPC分类号： C01F7/06
摘要： An improved process is provided for the recovery of sodium aluminate crystallized from a digest of caustic and lime with high-silica aluminous materials. The digest solution is concentrated by evaporation and then seeded with Na.sub.2 Al.sub.2 O.sub.4.2.5H.sub.2 O crystals to crystallize alumina from the solution as Na.sub.2 Al.sub.2 O.sub.4.2.5H.sub.2 O. The crystals are then separated from the mother liquor solution by filtration or centrifugation. The crystals are then washed with a solution having a lower caustic content than the mother liquor and an alumina concentration of about 50 grams per liter to remove any mother liquor remaining on the crystals. The sodium aluminate crystals are used as a feed for a subsequent Bayer processing step.
摘要翻译：提供了一种改进的方法，用于回收由高硅铝质材料从苛性碱和石灰的消化物中结晶的铝酸钠。将消化液通过蒸发浓缩，然后用Na 2 Al 2 O 4·2.5H 2 O晶体接种，以Na 2 Al 2 O 4·2.5H 2 O从溶液中结晶氧化铝。然后通过过滤或离心将晶体与母液溶液分离。然后用比母液低的苛性碱溶液和约50克/升的氧化铝浓度的溶液洗涤晶体以除去留在晶体上的任何母液。铝酸钠晶体用作随后的拜耳加工步骤的进料。

2. 发明授权

US5744412A Composition and process for making an insulating refractory material 失效
$Composition and process for making an insulating refractory material$
标题翻译：制造绝缘耐火材料的组成和工艺
公开(公告)号：US5744412A
公开(公告)日：1998-04-28
申请号：US644440
申请日：1996-05-13
申请人： Alan Pearson , Thomas G. Swansiger
发明人： Alan Pearson , Thomas G. Swansiger
IPC分类号： C04B35/101 , C04B35/66
CPC分类号： C04B35/101 , C04B35/66
摘要： A composition and process for making an insulating refractory material. The composition includes calcined alumina powder, flash activated alumina powder, an organic polymeric binder and a liquid vehicle which is preferably water. Starch or modified starch may also be added. A preferred insulating refractory material made with the composition has a density of about 2.4-2.6 g/cm.sup.3 with reduced thermal conductivity, compared with tabular alumina. Of importance, the formulation has good abrasion resistance and crush strength during intermediate processing (commercial sintering) to attain full strength and refractoriness, good abrasion resistance and crush strength.
摘要翻译：一种制备绝缘耐火材料的组合物和方法。该组合物包括煅烧氧化铝粉末，快速活化氧化铝粉末，有机聚合物粘合剂和优选为水的液态载体。还可以加入淀粉或改性淀粉。与片状氧化铝相比，用该组合物制成的优选的绝缘耐火材料具有约2.4-2.6g / cm 3的密度，导热率降低。重要的是，该制剂在中间加工（商业烧结）中具有良好的耐磨性和抗碎强度，以获得全部强度和耐火性，良好的耐磨性和抗压强度。

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