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Electrogalvanizing using zinc recovered from nonferrous smelter dusts.
Dattilo-M; Cole-ER Jr.; O'Keefe-TJ
Conserv Recycl 1986 Jan; 9(1):55-66
Bureau of Mines recycling research devises technology that enables the recovery of metals, minerals, and other values from waste products and thus promotes the wise and efficient use of resources. Bureau researchers are investigating the use of waste products containing zinc as a source of zinc for electrogalvanizing. Wastes used in this work were lead smelter flue dust, wastewater treatment sludge, copper smelter flue dust, and brass smelter flue dust. After zinc extraction with sulfuric acid, the resultant solutions were partially purified and used to electrogalvanize 0.234-Cm (0.092- In.) Diameter 1070 alloy steel wire. The corrosion resistance of the electrogalvanized wire from waste electrolyte was compared with electrogalvanized wire from relatively pure electrolyte prepared in the laboratory and with electrogalvanized wire from an industrial electrogalvanizing plant. Electrogalvanized wire obtained from waste electrolyte prepared from brass smelter flue dusts compared favorably with industrial electrogalvanized wire and electrogalvanized wire from the relatively pure electrolyte. Impurities in the waste electrolyte caused some problems. Copper was undesirable because it passivated the soluble zinc anode. Impurities such as cobalt and nickel also slowly coated the anode. Owing to the ease of removal of copper by cementation, it posed no processing problem. Bench-scale work with brass smelter flue dusts led to large-scale trials at an industrial electrogalvanizing plant.
OP; Journal Article
Issue of Publication
Conservation & Recycling
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division