VERFAHREN ZUM HERSTELLEN VON ALUMINIUMOXID ZUM SCHLEIFEN UND/ODER POLIEREN AUS ALUMINIUMHYDROXID

摘要

In a process for producing grinding and/or polishing aluminium oxide from aluminium hydroxide, which can be produced on an industrial scale (in particular by the BAYER process), the aluminium hydroxide is pressed into highly compacted blanks which are then calcined at a temperature and for a length of time such that practically anhydrous aluminium oxide, consisting predominantly of alpha aluminium oxide, is obtained. The aluminium oxide powder so obtained has a very homogenous phase composition and, depending on the calcination conditions, exists as micro abrasive grain or as polishing alumina and is suitable for use in highest-quality optical equipment.