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The operation of an EAF is a batch process in which steel scrap, pig iron, a source of iron oxide such as roll scale or iron ore, and limestone or burnt lime are charged into the furnace. The roof is closed over the furnace and electrodes are lowered until arcs are established between them and the metallic charge. The heat generated by the arc and the heat rotaryairhammerdrills developed from the resistance to the flow of current in the metal melts the charge. When rotaryairhammerdrills the rotaryairhammerdrills heat (meaning the metal in the furnace) is finished, the furnace is tilted and poured into a tap ladle through a tap hole or spout in the furnace side wall. After each heat, repairs to the bottom and slag line are made by shoveling in a refractory bottom patching material.

The rotaryairhammerdrills first step in assuring proper installation, after proper material selection, is mixing the refractory. However, in order in to properly mix it you must know how you intend to install it. There are four fundamentally different ways to install refractories:* The gunning method permits the handling of a large volume of materials. Water is added at the discharge nozzle or back at the charging chamber. The amount of water is determined at the point of installation by the nozzle man and also by the characteristics of the refractory. Forms are not required. The advantages, of course, are speed and versatility. Rebound losses mean that more material will be needed than for casting. Overage will vary considerably depending on whether a ceiling, a wall or a floor is being rotaryairhammerdrills installed.

The cast, or pour, method is one in which the area is made completely watertight by use of forms (i.e. ladle walls and floor). The mix would contain more water than a trowel application mix. A cast refractory should be thoroughly worked into place, with internal air bubbles removed by rodding or vibrating. The best method is to use vibratory equipment, since it encourages the material to flow freely and completely fills the form or box. Vibrating also permits working with a stiffer mix (less water). However, hand rodding--with a shovel, rotaryairhammerdrills rod, ice scraper or pole--will suffice if done thoroughly. Working out all the air strengthens the material and reduces porosity. The action of vibration or rodding sets the refractory particles in motion, reducing the friction between the particles and giving the mixture the texture of a thick fluid. Internal vibrating or rodding does the most consistent job, but external vibration is also effective. Although vibration equipment is available rotaryairhammerdrills for refractories, it can often be improvised with equipment already on hand to vibrate the mass externally. An air hammer held against the form can do a good job in many cases. So may a nut runner or other pneumatic vibratory tool. Even hammering the form with a hand sledge will do if accompanied by hand rodding. In all cases, be sure the material is worked near the forms. That is where air bubbles collect.

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