Furnace flue dust processing method
AssigneeMaumee Research & Engineering, Inc.
InventorsDeane A. Horne, Dennis W. Coolidge
Life of this patent
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Abstract
A method of processing flue dust that contains one or more compounds from a first group of zinc, lead and cadmium compounds, and contains iron compounds, involves heating the flue dust to cause a substantial portion of one or more of the compounds of the first group to become gas-borne. A carbonaceous material is introduced to the remaining flue dust, and the flue dust/carbonaceous material mixture is heated to cause a substantial portion of the remaining compounds from the first group to become gas-borne while retaining a substantial portion of the iron in a non-gas-borne condition. The gas-borne compounds are separated from the non-gas-borne compounds.
Claims16
A method of processing flue dust that contains one or more compounds from a first group consisting of zinc, lead and cadmium compounds, and contains iron compounds, the method comprising introducing the flue dust into a closed vessel at a first location, heating the flue dust to cause a substantial portion of one or more of the compounds of the first group to become gas-borne, thereby consuming a portion of the flue dust, introducing a carbonaceous material to the remaining flue dust at a second location within the same vessel, thereby creating a flue dust/carbonaceous material mixture, and heating the flue dust/carbonaceous material mixture to cause a substantial portion of the remaining compounds from the first group to become gas-borne while retaining a substantial portion of the iron in a non-gas-borne condition, and separating the gas-borne compounds from the non-gas-borne compounds.
A method of processing flue dust that contains lead compounds and iron compounds, the method comprising heating the flue dust in a closed vessel to cause a substantial portion the lead to become gas-borne, thereby consuming a portion of the flue dust, introducing a carbonaceous material to the remaining flue dust within the same vessel, thereby creating a flue dust/carbonaceous material mixture, heating the flue dust/carbonaceous material mixture to cause additional constituents of the flue dust to become gas-borne while retaining a substantial portion of the iron in a non-gas-borne condition, and separating the gas-borne compounds from the non-gas-borne compounds.
A method of processing flue dust that contains one or more compounds from a first group consisting of zinc, lead and cadmium compounds, and contains one or more compounds from a second group consisting of iron, silicon, calcium, magnesium and aluminum compounds, the method comprising introducing the flue dust into a closed vessel at a first location, heating the flue dust to cause a substantial portion of one or more of the compounds of the first group to become gas-borne, thereby consuming a portion of the flue dust, introducing a carbonaceous material to the remaining flue dust at a second location within the same vessel, thereby creating a flue dust/carbonaceous material mixture, and heating the flue dust/carbonaceous material mixture to cause a substantial portion of the remaining compounds from the first group to become gas-borne while retaining a substantial portion of the second group in a non-gas-borne condition, and separating the gas-borne compounds from the non-gas-borne compounds.
Dependencies are inferred from the claim text.