US 12,258,672 B2 · Selective sulfidation and desulfidation

Abstract

Various embodiments utilize selective sulfidation and/or desulfidation for such things as ore and concentrate cracking, metal separation, compound production, and recycling. Selective sulfidation can be used to selectively convert an oxide or other material in a feedstock to a sulfide or other sulfur-containing material, and selective desulfidation can be used to selectively convert a sulfide or other sulfur-containing material in a feedstock to an oxide or other material. In some cases, the material produced by such selective sulfidation/desulfidation of the feedstock can itself be novel and/or commercially valuable, while in other cases, such selective sulfidation/desulfidation can be followed by one or more processes to extract, isolate, or concentrate the converted material.

Claims20

Dependent claims

A process for selective sulfidation of a target metal compound of a feedstock material within a reactor, the target metal compound consisting of a metal oxide, oxysulfide, carbonate, sulfate, or sulfide, the process comprising:

introducing a flow of sulfur-containing gas into the reactor through a gas inlet of the reactor;
and
passing the flow of sulfur-containing gas through the feedstock material within the reactor while controlling a roasting atmosphere in the reactor about the feedstock material including at least a process temperature and a ratio of sulfur to sulfur dioxide chosen for selective sulfidation of the target component to produce a selectively sulfidized compound including a sulfate, oxysulfide, or sulfide of the target metal, the ratio of sulfur to sulfur dioxide being maintained above a predetermined critical ratio for such selective sulfidation of the target metal compound.

Dependencies are inferred from the claim text.

Selective sulfidation and desulfidation

Life of this patent

Selective sulfidation and desulfidation

Life of this patent

Abstract

Claims20