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Recovery of Lead from Battery Scrap.
U S Pat 3 940 265 1976 Feb; :
Lead is recovered from battery scrap by (1) reacting with a slurry of ca(oh)2 to form pbo and caso4.2H2o, (2) filtering and drying, (3) reacting the product with a mixture of carbon, kcl, and nacl at elevated temperature to flux the caso4 and reduce pbo to pb. Thus, 2,268 g of battery plates (28.5 pct pbso4) and 350 ml h2o were ball milled 45 min to -100 mesh. The product and a slurry containing 158 g ca(oh)2 and 500 g h2o were added to a revolving drum reactor. After reacting for 10-15 min, the reaction product was filtered and dried at 200 deg c. Then -80 mesh charcoal 55, kcl 657, and nacl 516 g were added and the mixture was reacted 1 h with mixing at 650 deg c. The molten pb was separated from the slag by pouring to give a recovery of 94.9 pct.
U.S. Pat. 3,940,265; Feb. 24, 1976; Chem. Abstr. 84:P167,789k
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