Abstract: The invention relates to a water-injected screw compressor which comprises a compressor element (1) with an interior space (3), a suction conduit (7) which connects to an inlet part (6), situated at the top of this interior space (3), a pressure conduit (9) in which a vessel (10) is installed, and an injection conduit (22) between the vessel (10) and the interior space (3), which comprises a part (31) which is situated higher than the upper side of the inlet part (6). A connection conduit (36) is provided between the inlet part (6), on one hand, and a connection point, situated above the maximum water level (35) of the vessel (10), onto the part (32) of this injection conduit (22) extending downward towards its exit, on the other hand.

Abstract: A free-flowing granular bitumen product containing from 0.5 to 6% by weight of a powdery coating and separating agent such as synthetic silica or carbon black is prepared by atomizing hot, liquid bitumen in a spray mixer while simultaneously introducing the powdery coating and separating agent by means of the cold air flow into the spray mixer.