PROCESS FOR THE CALCINATION OF FILTER CAKES WITH HIGH SOLIDS CONTENTS BEING PARTLY PRE-DRIED IN A DIRECTLY HEATED ROTARY KILN

摘要

A process for calcining a filter cake in a directly heated rotary kiln wherein part of the filter cake is separated from the entire mass of filter cake, the separated portion is predried and recombined with the remainder portion and the combined predried and remainder portion is calcined. The filter cake can be inorganic solids such as oxides of titanium, chromium (III), zinc and iron.