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.
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).
KAMIJO TOMOYUKI
KAMIKAWA YOSHIHIRO
| JP2009191395A | 2009-08-27 | |||
| JPS522807A | 1977-01-10 |
Takato Tsutsumi