Abstract:
A plastics tube comprises a duroplastic material with a fiber reinforcement of at least one tubular, endless knitted fabric impregnated with the duroplastic material, wherein the ends of the tube are provided with flanges, the endless tubular knitted fabric extending radially outwards into the flange and being impregnated with a circular insert.
Abstract:
In the operation of a kiln including feeding a granular material by means of a gas into said kiln, advancing said material through said kiln and removing a product from said kiln, the improvement in charging said kiln which comprises providing a wear-resistant mixer tube as the inlet to said kiln, blowing feeder gas from a nozzle into said tube spaced therefrom under a pressure greater than prevails in said kiln, and dropping said granular material about the outlet of said nozzle at a rate such that said granular material is conveyed by said gas into said tube. A suitable apparatus is shown. The invention is especially suited for roasting of pyrites to produce SO2.