METHOD FOR EFFICIENTLY USING IRON CONTENT AND ZINC CONTENT IN SECONDARY DUST PRODUCED FROM REDUCING FURNACE

摘要

PPROBLEM TO BE SOLVED: To provide a more efficient method and specific condition for increasing an enrichment rate of zinc and a collection rate of zinc, in a process of collecting the zinc by reducing a by-product containing iron and zinc such as dust and sludge, which is produced in an iron manufacture process. PSOLUTION: The method for efficiently using the iron content and zinc content in secondary dust produced in a reducing furnace includes a first step of preparing slurry in which the secondary dust produced in the reducing furnace is suspended in a liquid, and subjecting the slurry to an ultrasonic treatment so as to exfoliate fine particles containing much zinc from a large particle containing much iron in a microscopic state, and a subsequent second step of separating a part containing many fine particles of zinc from a part containing many iron particles in a macroscopic state, wherein the ultrasonic treatment conducted in the first step satisfies such a condition that a product Y (Wmin/L) of an ultrasonic irradiation strength X (W/L (watt/liter)) per 1L (liter) of slurry and a treatment time expressed by minutes is expressed by the following expression: Y110*Exp(0.02*X). PCOPYRIGHT: (C)2010,JPO&INPIT