US 4,358,310 A · Dry collection of metallized fines

Abstract

A method and apparatus for the dry collection of metallized fines from a direct reduction furnace cooling zone in which cooling gas removed from the cooling zone passes through a dust collector and the removed dust is cooled in a fluidized bed, the fluidizing gas being recirculated through an indirect cooler. The process is continuous and the fines are collected at a sufficiently low temperature for easy handling. The apparatus includes a hot gas cyclone in the cooling gas withdrawal line connected to a fluidized bed cooler, a conduit for withdrawing fluidizing gas from the fluidized bed cooler passes through a second cyclone dust collector then through an indirect cooler and returns to the fluidized bed cooler. Cool fines are withdrawn from the fluidized bed cooler into a collector.

Claims10

Dependent claims

A method for cooling and collecting solid fines from the cooling zone of a direct reduction shaft furnace comprising:

(a) removing spent cooling gas and entrained fines from the cooling zone of a shaft furnace;
(b) passing said fines-laden gas into a cyclone dust collector;
(c) separating said fines from said spent cooling gas in said dust collector;
(d) passing said collected fines into a fluidized bed;
(e) maintaining said fines in suspension by blowing a fluidizing gas into said fluidized bed, thereby cooling said fines;
(f) removing cooled fines from said cooler;
(g) removing said fluidizing gas from said cooler;
and
(h) passing the removed gas through an indirect cooler to cool said gas and returning the cooled gas to said fluidized bed cooler.

6 more elements

Dependencies are inferred from the claim text.

Dry collection of metallized fines

Life of this patent

Dry collection of metallized fines

Life of this patent

Abstract

Claims10