Processing of sulfate and/or sulfide-rich waste using CO₂-enriched gases to sequester CO₂, reduce environmental impacts including acid rock drainage and produce reaction products

摘要

A process is provided for stabilizing a sulfate and/or sulfide-rich waste material, comprising metal sulfide minerals, and sequestering CO2 comprises exposing the material to a CO2-enriched gas mixture, reacting the CO2-enriched gas mixture with the metal sulfide minerals and forming a CO2-depleted gas mixture and a carbon-containing compound and at least one product selected from the group consisting of a purified metal or a metal-rich compound suitable for smelting or refining, sulfuric acid, sulfur and sulfurous acid, and system and apparatus therefor.

主权项

1. A process for stabilizing a waste material rich in a metal-sulfate compound and/or rich in a metal-sulfide compound which comprises:
exposing the waste material to a CO2-enriched gas mixture, reacting the CO2-enriched gas mixture with the metal-sulfate and/or metal-sulfide compound; and forming a CO2-depleted gas mixture and a carbonate-containing compound and at least one product selected from the group consisting of a purified metal or a metal-rich compound suitable for smelting or refining, sulfuric acid, sulfur, hydrogen sulfide, sulfur dioxide, sulfur trioxide and sulfurous acid.