Abstract: In order to reduce or avoid the discharge of gaseous pollutants H.sub.2 S and SO.sub.2 to the environment in a process for the production of slag sand (granules) from blast-furnace slag by granulation of the slag by means of a water jet, the propulsion jet interspersed with water vapor, granules and pollutants is injected directly into a water receiver, the residual vapor still remaining and the pollutants H.sub.2 S and SO.sub.2 not yet washed out are cooled down in a condenser in counter-current with spray water and condensed, and the residual gas remaining after the vapor condensation is taken off from the top end of the condenser and recycled via a recycle line back to the injector.

Abstract: To apply a braking force to only one face of travelling strip material with the least possible surface scratching, it is passed over an evacuated box having a perforated wall covered by a permeable layer.

Abstract: In a rolling mill for a metal workpiece and comprising a pair of rotary work rolls for reducing the thickness of the workpiece when it is fed therebetween, a carrier for at least one of the work rolls comprises a cam surface which can roll on a counterface provided on a backing member for the carrier. Means are provided for displacing the carrier, whereby the cam surface is rolled on the counterface of the backing member and the said one work roll is displaced to describe a path determined by the shapes of the cam surface and counterface. It is preferred that each work roll of the pair be supported by a separate displaceable carrier, each carrier having a cam surface which can roll on counterfaces of separate associated backing members.