Preparation of feed material for a blast furnace
AssigneesMetallurgical Processes Limited, I.S.C. Smelting Limited (Metallurgical Development Company)
InventorColin Frank Harris
Life of this patent
Estimating the term…
Abstract
Producing a briquetted oxidic feed for a blast furnace by pelletizing very fine zinc oxide or zinc oxide and lead oxide powder into pellets having an average diameter of from 2 to 10 millimeters prior to briquetting the oxide pellets at a temperature of from 500.degree. to 800.degree.C and a pressure of from 1 to 20 tons/square inch.
Claims8
In a process for producing a briquetted oxidic feed for a blast furnace comprising briquetting an oxidic material selected from the group consisting of zinc oxide powder and zinc oxide and lead oxide powder at a temperature of from 500.degree. to 800.degree.C and a pressure of from 1 to 20 tons/square inch, without the addition of a binder, to form coherent briquettes suitable for feeding to a blast furnace, the improvement comprising the steps of:
- a. pelletizing the oxidic material powder of a fineness insufficient to form coherent briquettes suitable for feeding to a blast furnace into substantially spherical pellets having an average diameter of from 2 to 10 millimeters;
- and
- b. heating the pellets to a temperature of from 500.degree.C. to 800.degree.C prior to the briquetting step.
In a process for producing a briquetted oxidic feed for a blast furnace comprising briquetting an oxidic material selected from the group consisting of zinc oxide powder and zinc oxide and lead oxide powder at a temperature of from 500.degree.C to 800.degree.C and a pressure of from 1 to 20 tons/square inch, without the addition of a binder, to form coherent briquettes suitable for feeding to a blast furnace, the improvement comprising the steps of:
- a. pelletizing the oxidic material powder of a fineness insufficient to form coherent briquettes suitable for feeding to a blast furnace into substantially spherical pellets having an average diameter of from 2 to 10 millimeters by passing the oxidic material through a rotating heated pelletizing kiln at a temperature of from 900.degree. to 1300.degree.C;
- and
- b. cooling the pellets to a temperature of from 500.degree. to 800.degree.C prior to the briquetting step.
Dependencies are inferred from the claim text.