B - Operations – Transporting – 24 – D
Patent
B - Operations, Transporting
24
D
57/19
B24D 3/00 (2006.01) C01F 7/02 (2006.01) C01F 7/32 (2006.01) C09K 3/14 (2006.01)
Patent
CA 1242588
Abstract of the Disclosure A method of making sintered aluminous abrasives from uncalcined bauxite. The uncalcined bauxite is mixed with sulphuric acid and dissolved. This forms aluminum sul- fate hydrate as a major product. The aluminum sulphate hy- drate 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 dissol- ving 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 par- ticles are sintered. The sintered particles are finally cooled, then screened into the various desired abrasive grit sizes. Alternate methods for forming the unfired body in- clude: 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.
500977
Abrasive Industries Inc.
Macrae & Co.
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