申请人:Dresser Industries, Inc.
公开号:US04568363A1
公开(公告)日:1986-02-04
A method of making sintered aluminous abrasives from uncalcined bauxite. The uncalcined bauxite is mixed with sulphuric acid and dissolved. This forms aluminum sulfate hydrate as a major product. The aluminum sulphate hydrate is then dried to form aluminum sulphate which is then calcined to form gamma alumina and sulphur trioxide. The sulphur trioxide is mixed with water to form sulphuric acid and is then recycled for further use as additional dissolving material. A slurry of the gamma alumina is prepared, poured into a container and then dried to form a cake known as an unfired body. The unfired body is then broken into particles and screened to size. Following this, the particles are sintered. The sintered particles are finally cooled, then screened into the various desired abrasive grit sizes. Alternate methods for forming the unfired body include: (1) extrusion of a paste made up of gamma alumina and water followed by drying of the extruded material; and (2) pressing the dry gamma alumina into compacted cakes.
一种从未经煅烧的铝土矿制造烧结铝砂的方法。将未经煅烧的铝土矿与硫酸混合并溶解,形成硫酸铝水合物作为主要产物。然后将硫酸铝水合物干燥成硫酸铝,再经过煅烧形成伽马氧化铝和三氧化硫。将三氧化硫与水混合形成硫酸,然后回收再利用作为额外的溶解物。制备伽马氧化铝浆料,倒入容器中,然后干燥形成未烧结体。将未烧结体打碎成颗粒并筛选成大小。随后对颗粒进行烧结。最后冷却烧结颗粒,然后筛选成所需的不同研磨粒度。形成未烧结体的备选方法包括:(1)挤压由伽马氧化铝和水组成的糊状物,然后将挤出的材料干燥;和(2)将干燥的伽马氧化铝压成紧实的饼。