Charge And Operation of Puddling Furnace

Charge And Operation of Puddling Furnace Points : Charge And Operation of Puddling Furnace, Definition Definition The furnace is then charged with about 270 kg (about 600 lb.) of pig iron and the door is closed. After about 30 mm the iron is melted and the puddler adds more iron oxide into the iron with a bent iron or mill scale to the charge, working the oxide into a bent iron bar called a radial.
The silicon and most of the manganese in the iron and some sulfur and phosphorus are eliminated. The temperature of the furnace is slightly, and the carbon starts to burn out as carbon- oxide gassed. As the gas is puffs up and the level of the charge rises. As the carbon is burned away the melting of the alloy increases and the charge becomes more and more pasty, and finally the its former level. As the iron increases in purity, the puddler stirs the charge with the ensure uniform composition and proper cohesion of the particles. The resulting sponge like mass is separated into lumps, called balls, of about 80 to 90 kg (about 180-200 lb.) each. The balls are withdrawn from the furnace with tongs and are placed directly in a sqezer machine in which the greater part of the intermingled siliceous slag is expelled from the ball and the grains of pure iron are thoroughly welded together. The iron is then cut into flat pieces that are piled on one another, heated to welding temperature, and then rolled into a single piece. This rolling process is sometimes repeated to improve the quality of the product.