A second hand sand plant is offered for sale. for all your sand and aggregate washing needs, contact rivergum industries! latest news & gallery. washed sand. the evolution of sand screws. second hand fines master for sale. screw washer/sand screw lower end bearing parts. about.Aggregate crushing plant in verwoerdburg rwanda. aggregate crushing plant soft stone usually refers to the stone like limestone marble talc gypsum calcite phosphorite etc the classic production line for the soft stone is jaw crusher primary crusher impact crusher secondary crusher and with the auxiliaries of vibrating feeder vibrating screen amp belt.