US 4,072,504 AGranted

Method of producing metal from metal oxides

AssigneeAktiebolaget Svenska Kullagerfabriken

InventorsOrn G. Perdahl, Sven O. Santen

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Abstract

The present invention relates to a method for producing metal from metal oxides, especially iron from iron oxides by a pre-reduction as well as final reduction wherein the pre-reduced oxidic material as well as optional slag formers and optional recirculated gas are injected at the bottom through tuyeres or the like by means of a carrier gas, inert or reducing of a reactor resembling a shaft furnace filled with solid reducing agent during simultaneous supplying of energy, e.g. in the form of oxygen gas and hydrocarbon, the oxidic material being blown against a pillar of solid reducing agent at such a level that essentially all injected solid material is retained (e.g. by galling) on the lower end of the pillar to bring the oxidic material to instantaneous final reduction, melting and possible alloying of the reduced metal.

Claims6

Dependent claims

A method for producing liquid metal from metal oxides selected from the group consisting of oxides of tungsten, chromium, manganese, nickel, and iron and mixtures thereof by a first pre-reduction step and a final reduction and melting step, comprising;

(a) as said pre-reduction step, contacting said metal oxides with outgoing reducing gases from step (d) to pre-reduce said metal oxides to a degree of pre-reduction of at least 33%;
(b) feeding solid non-particulate reducing material to the top of a shaft furnace reactor to substantially fill said reactor;
(c) heating the bottom of said reactor to at least the melting point of the metal being produced to supply sufficient heat energy to cover the heat demand for said final reduction and melting step;
and
(d) as said final reduction and melting step, blowing said pre-reduced metal oxides with a carrier gas through tuyeres into the bottom of said substantially filled reactor to contact said pre-reduced metal oxides with said solid reducing material to completely reduce said metal oxides and produce liquid metal and reducing gas.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/669,863Filed 24 Mar 1976 · continuation
Priority: SW 730109926 Jan 1973
Granted: 7 Feb 1978
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

C21B 13/143
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