| Description |
viii, 54 leaves : illustrations ; 29 cm |
| Summary |
"A study of commercial copper refinery anode slimes has been conducted to evaluate the separation of valuable metals contained in the slimes. The slimes contain substantial quantities of Ag, Sn, Au, Pb, and Cu. The values were present principally as AgCl, SnO₂, Au, PbSO₄, Cu and CuSO₄. A Roast-Leach-Roast-Leach (RLRL) technique solubilized up to 91 pct of the Ag and 99 pct of the Cu from raw slimes. The Pb-Sn separation was investigated using the following hydrometallurgical techniques: 1) DETA (diethylene triamine) leaching; 2) NaOH leaching; 3) (NH₄)₂CO₃ leaching; and 4) NaOH with Na₂S plus NaNO₂ leaching. The NaOH with Na₂S plus NaNO₂ leaching process was ineffective in Pb-Sn separation. The (NH₄)₂CO₃ leaching process involves two leaching operations plus the electrowinning operation to recover Pb, which makes this process expensive; also the Pb recovery was poor. DETA leaching and NaOH leaching have been found to be effective from a chemical standpoint. These processes have been able to separate the Pb and the Sn into two products: 1) a Pb concentrate assaying 86.1 pct Pb with 95.6 pct of the Pb reporting to the Pb product, and 2) a Sn product assaying 54.6 pct Sn which contained 97.6 pct of the Sn along with almost all of the Au from slimes. A proposed flow sheet would call for an acid Roast-Leach-Roast- Leach followed by DETA leach and filtration to separate a Sn rich residue; PbS would then be precipitated from the filtrate and recovered by another filtration step. The DETA solution would then be regenerated by the addition of CaO to remove the sulfate"--Abstract, leaf ii. |
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