General Metallurgy |
Other editions - View all
Common terms and phrases
acid alloy anthracite apparatus Beehive Berg Bituminous bituminous coal bottom brick briquettes brown coal Bull burning by-product calorific power carbon cast-iron cent chamber charcoal charge charring Chem chemical chemical compound clay CO₂ coke combustion composition cooling copper crucible curve cylinder decomposed diam discharge Eisen eutectic flue fuel furnace gases grate H₂O hearth heat horizontal Hüttenw Inst Iron Age iron blast-furnace J. I. and St Lignite liquid long ton metal Metallurgie mill oven oxide pass peat pipe plant plate plunger pressure pulp pump pyrometer retort reverberatory furnaces roasting rolls Section shaft shown in Fig silicates SiO2 slag slime smelting solid solution specific gravity Stahl steam steel sulphide TABLE tank temperature tons U. S. Geol vapor vertical volatile matter weight wood ΙΟ
Popular passages
Page 513 - Ampere is the unvarying electric current which, when passed through a solution of silver nitrate in water in accordance with standard specifications, deposits silver at the rate of 0.00111800 gram per second.
Page 719 - The slime-pulp before filtration should be settled to as thick a consistency as possible consistent with ready handling by pumps and in pipes. 4. The temperature of the slime-pulp should be maintained between 20° and 30° C. or higher. 5. The temperature of the wash-water and the pulp should be the same. 6. Vacuum-pressures should be varied until the proper intensity for the given slime is obtained. 7. Where very clayey slime is to be filtered, as much fine sand (limited as stated above) should...
Page 430 - ... slides on its planed bottom over the planed top of the suction-box, thus making an air-tight joint. A pair of cast-steel sprocketwheels, turning inside of concentric guide-rails, lift the train of pallets from the lower to the upper track by engaging their teeth with the roller-wheels, and launch each pallet in a horizontal path under the feed-hopper and igniting-furnace, and over the suction-box. In a train of pallets in action, all the joints are kept closed, and air-tight, by the pallet being...
Page 756 - ... proportional to the difference between the fourth powers of the absolute temperatures of the hot parts of the furnace and the boiler plate.
Page 431 - ... be accomplished by almost any kind of flame that will give a quick, intense heat. The amount of heat required at this point of the operation is exceedingly small and the cost of ignition correspondingly low. The wide variety of suitable means makes it possible to meet almost any local requirements. The complete cycle of operations is as follows : A pallet being pushed outward tangentially from the top of the sprocketwheels, passes under the feed-hopper, where it takes its load of ore in the form...
Page 431 - The igniter frequently used with this machine is a small coal-burning furnace built of tiles, having a grate-area of 10 by 30 in. and burning 500 Ib. of coal in 24 hr. The flame after passing over the fire-bridge is deflected downward upon the ore by a brick curtain that can be raised and lowered, and then is drawn upward by the natural draft of a small stack or bleeder. The suction-box on top is 12 ft. 6 in. long and 30 in. wide, and gives for the grates an effective hearth-area of 31.25 sq.
Page 281 - OVENS. Bee-Hive. Ordinary type, 12.5 ft. in diameter. Cost from $700 to $1,200 per oven. Produces 4 net tons of coke in 48 hr. = 2 net tons in 24 hr. Yield of coke from coal, 60 per cent. By-products and surplus gas = none. By-Product Ovens. Oven charge, 9 tons. Coking-time, 24 hr. (Ovens may be larger or smaller than this, but 9 tons would probably be about the average charge for the modern type of oven.) Coke produced on 70 per cent, yield = 6.3 tons of coke per oven in 24 hr.
Page 719 - Conclusions. Certain practical conclusions may be drawn from the experimental work. These have been in part stated, but may not be out of place here, together with certain general conclusions which are not so directly shown by the experimental work. They are: 1. The proportion of clayey material in ores which are to be subjected to " all-sliming " and nitration should be maintained at a minimum.
Page 431 - ... the same time comes within the influence of the downward-moving currents of air, induced by the suction-draft; these carry the sintering action progressively downward until it reaches the grates. The roast-sintering operation is complete, the cake is discharged by dropping into the discharge-guides, and the pallet crowds its way back to the sprocket-wheels, is slowly raised to the upper tracks, and begins a new cycle. A straight-line machine of the size described with effective area of 31.25...
Page 430 - Fig. 86, consists of a frame of structural steel supporting a feeding-hopper, an igniting furnace, a suction-box, and a pair of endless track circuits to accommodate a train of small truck-like elements called pallets which, in combination, form practically an endless conveyor, with the continuity broken at one place in the circuit. Each pallet is provided with four wheels, which engage with the tracks or guides at all parts of the circuit except when the pallet is passing over the...