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A New Sulfur Dioxide-free Process for Recovering Lead from Battery Scrap.
NTIS: PB 252 615 :13 pages
A laboratory method for processing lead battery scrap has been developed that eliminates virtually all of the so2 emission that normally is produced when a reverberatory or blast furnace is used. The method employs a hydrometallurgical step to convert the pbso4 to pbo and caso4 by mixing the battery scrap with a slurry of ca(oh)2. The reaction is exothermic and goes to completion in 2 to 5 minutes at room temperature. The dried product is mixed with a kcl-nacl flux and carbon and reduced at 650 deg. C. A minimum charge ratio of 3 parts of carbon to 100 parts of battery scrap is required for reduction. The process produces lead reductions and recoveries as high as 97.0 and 94.9 percent, respectively. The kcl-nacl flux is recovered using a standard countercurrent water leach followed by evaporation.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 252 615
Page last reviewed: November 26, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division