The Mechanical Handling and Storing of Material

STORING OF COAL AND OTHER MINERALS 659 receiving hopper on the jetty. These hoppers deliver into two breakers which reduce the chalk to a suitable size for handling in the cement works, and it is delivered into a stock heap, in the first instance, by means of a gravity bucket conveyor. The capacity of this plant is 60 tons of broken chalk per hour. The installation was erected by Messrs Babcock & Wilcox for Messrs Caseborne & Co., Haverton Hill-on-Tees. Phosphate Drying and Storage Plant (Darley System). —A complete plant of the Amalgamated Phosphate Co., of Florida, is shown in Figs. 924 to 926, which represent the general scheme of operation of a modern pebble phosphate plant. 1 he trains from the mines are run over the wet bins of 3,000 tons capacity to a stock pile beyond. From the former the rock is drawn by three belt conveyors. The mill building between the wet and dry bins contains the elevators and oil-burning driers. The dried rock is elevated, screened, and then distributed in the 30,000 tons dry storage by means of three motor-driven cars. Standard gauge phosphate cars are run in beneath the dry bin on the four tracks and are served by the loading spouts. The installation is the design of the Guarantee Construction Co., of New York. Mechanically Equipped Ore Stock Pile of the Cape Copper Co.r Briton Ferry.—The general arrangement of an installation for handling broken ore erected by Babcock & Wilcox, Ltd., is shown in Figs. 927 to 929. Standard gauge railway wagons are brought to the point indicated on the elevation, and are placed on a cradle, which is tipped over into the small hoppers which supply the material direct to gyratory breakers, after which the material is conducted by means of a shoot into hoppers, which again in turn deliver into the rotary fillers of the gravity bucket conveyor. I he material is elevated to the necessary height, carried over the storage space, and delivered at any points required, forming a large heap of ore. The capacity of the conveyor is 40 tons per hour, and the ore is taken away according to the requirements of the smelting works. Coke-handling Plant at the Provan Gasworks, Glasgow Corporation.— I his is shown in Figs. 930 to 932, and the process is briefly as follows: The coke is brought from the retorts in tip wagons by small locomotives, and discharged into the receiving hopper shown on the side elevation. The coke immediately passes through a regulating device into the fillers of the conveyors and is elevated and passed horizontally by these conveyors over the heap and discharged at any points required. I he wing or lower conveyors will build two outer heaps to a certain height, and the centre and higher conveyor will fill up the centre to a much greater height, form- ing altogether a long heap with three ridges, the centre ridge being higher than the outer ones. Mounted on the gantries of the wing conveyors are travelling cranes, and these lift the coke from either the centre heap or from the lower wing heaps, delivering it to the hoppers which are shown in plan in connection with the wing conveyors, which latter will then carry it on to the screens shown at the extreme right of the side elevation. These screens are operated by a gas engine, and discharge the screened coke, breeze, etc., into the respective wagons set aside for this purpose. The rate of handling of each of the conveyors is 30 tons per hour, or a combined capacity of 90 tons per hour. The installation was erected by Messrs Babcock & Wilcox, Ltd. Coal Storage Plant of the Indianapolis Light and Heat Co.—-This installation (Fig. 933) is unique in that provision has been made for submerging the coal under water to prevent spontaneous combustion. The plant has a total storage