METHOD OF TREATING RECYCLABLE RAW MATERIALS

摘要

A method of treating recyclable raw materials containing valuable metals is provided, the method including the steps of: feeding recyclable raw materials (W) containing valuable metals into a rotary kiln furnace (2) in which a refractory product having an Al2O3-Cr2O3 content of 70% or greater is used for an inner wall; feeding an additive (A) containing SiO2 as a major component into the rotary kiln furnace (2) so as to increase a viscosity of a slag (S) flowing along the inner wall, thereby the recyclable raw materials (W) are attached on the slag (S) having a high viscosity such that at least part of the recyclable raw materials (W) is exposed to the inside of the rotary kiln furnace; and burning/melting the recyclable raw materials (W) attached on the slag (S) in the rotary kiln furnace (2).