Bucket elevators, solids transport

In a BoUmann extractor solids are continuously passed through, percolation extractor, gas-proof shell with endless chain and buckets for solids transport, cocurrent flow of solids and sprayed solvent on the left side, countercurrent flow on the right side of the bucket elevator, self-filtration effect. 

The rubber belt of a bucket elevator, fitted with aluminium buckets and used for transporting solid chlorate, jammed during use. Friction from the rotating drive pulley heated and powdered the jammed belt. A violent explosion consumed all the rubber belt and most of the 90 aluminium buckets. Bronze and steel equipment is now installed. 

The cattle manure with about 25 p.c. dry matter content and the litter is transported by trailer to the reception hopper for manure and solid organic wastes. From here manure will be delivered by a bucket elevator, with the help of feed screw conveyor into the digester tower made of anticorrosive steel. The slurry and the sewage water mixed with faeces will be pumped into the digester. 

Most nuclear wastes are in liquid or solid form. If the waste is solid, it may be transported by various methods in drums using forklifts, on conveyor belts, suspended in gases in pneumatic conveyors, suspended in liquids as slurries, in screw conveyors, in bucket elevators, etc. 

CONVEYORS. Pneumatic conveyors for solids are described in Chap. 7. Other common devices for transportation include belt conveyors and bucket elevators, closed-belt conveyors with zipperlike fasteners, and various kinds of drag and flight conveyors. These all include a return leg that carries the empty belt or chain back from the discharge to the loading point. Vibrating conveyors and screw conveyors have no return leg but only operate over relatively short distances. Pneumatic conveyors also have no return leg and are not so limited as to distance of travel. Conveyors for solids are discussed in Ref. 9a. 

Solids may be conveyed mechanically or pneiunaticaUy. Mechanical conveyors are tj ically belt, flight, screw, roller, or "en masse" transport devices. Solids are also moved by cranes and bucket elevators and by vibratory, star, and rotary plow feeders. 

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