Abstract: Formation of hexavalent chromium is reduced during incineration/combustion of materials containing hexavalent chromium by adding to the waste prior to or during combustion a small amount of sulfur. The sulfur can be added as elemental sulfur, as sulfur dioxide, or as high sulfur fuels or high sulfur waste.

Abstract: A cloud or dispersion of a particulate flux is formed in a combustion zone for the purpose of capturing metallic vapor from the combustion gas by formation of a eutectic of the metal and the flux, as a melt on at least the surfaces of the dispersed flux particles. The flux particles are heated within the combustion zone to a temperature sufficient to form the eutectic melt. The preferred flux particles utilized in the invention include conventional metallurgical fluxes, e.g. calcium carbonate, sodium carbonate and magnesium carbonate.

Abstract: Organic liquid-like hazardous waste is loaded with a sorbent in a container including interior and exterior compartments. The container is supplied to a rotary incinerating kiln. The waste is loaded in the container and the compartments are arranged so that the waste in the exterior compartment is initially vaporized in the kiln without the waste in the interior compartment mixing and being vaporized with the waste in the exterior compartment. The waste in the exterior compartment acts initially as a thermal and mass transfer barrier to prevent initial vaporization in the kiln of the waste in the interior compartment to substantially delay the vaporization of the waste in the interior compartment relative the vaporization time of waste in the exterior compartment and relative to the time when the waste in the interior compartment would have been vaporized if the container did not include the compartments.