| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a pellet useful to the cooling material for high temp. molten steel and the reducing material for steelmaking slag by using a steel-made drinking can as the raw material, integrally mixing steel and aluminum and making a bulk density of the pellet which is obtained by forming into a shape as sphericity or small pieces not lower than a specified value. SOLUTION: The steel drinking can is used as the raw material and the steel and the aluminum are integrally mixed and the bulk density of the pellet obtd. by forming into the shape as the sphericity or the small pieces, is made to be >=0.5 g/cc. The recovered steel can is crushed so as not to separate a body and a cap cover with a rougher compressor to reduce vol. Successively, the outer surface and the inner surface of the steel can is oxidation-treated at the high temp. with a rotary kiln to peelingly remove the surface coating material and an inner surface coat-treating agent. A granulating process is executed with two-step granulating processes, and in the first step granulating process, only rougher granulation is executed so that an Al-can cover part does not separate. In the second step granulating process, wearing-away and cracking are repeated, and finished to a granulated pellet product having the fixed shape and high density.</p> |
