Abstract
These investigations have developed an effective hydrometallurgical method to recover high-purity lead metal and elemental sulfur from simulated galena synthetic mixures eliminating sulfur gases and lead emissions, in contrast to the current high-temperature smelting technology. The method consists of different operations: oxidative leaching with production of solution with residue containing elemental sulfur., electrowinning by the solution with metal production. The obtained results determined the optimal parameters for possible processing of natural domestic galena ores.
Highlights
A major cost factor in the sintering and smelting process for producing Pb is the control needed to meet existing environmental standards for Pb emissions
The elemental S produced is more economical to store and ship than the sulfuric acid (H2SO4) generated by the high-temperature smelting process. This hydrometallurgical method consists of leaching galena synthetic mixures or concentrates in waste fluosilicic acid (H2SiF6) with hydrogen peroxide (H2O2) and lead dioxide (PbO2) as oxidantsat 95o, electrowinning the (PbSiF6) solution at 35o to produce 99,99%Pb metal, and solvent extraction to recover S, leaving a residue containing eventually present Cu, Ag, and other metal values
Experimental tests The conditions by the leaching process of the synthetic galena mixures (PbS) with gangue mineral's compounds (ZnS, CuS, NiS, CoS, CaO, MgO, Fe2O3, SiO2) and oxidants addition H2O2 and PbO2, leaching temperature with retaining leaching time in the presence of technical H2SiF6 is shown on the following tables
Summary
A major cost factor in the sintering and smelting process for producing Pb is the control needed to meet existing environmental standards for Pb emissions Another issue is the current concern over acid rain, which will in all probability result in even more stringent controls on emission of sulfur gases. The elemental S produced is more economical to store and ship than the sulfuric acid (H2SO4) generated by the high-temperature smelting process. This hydrometallurgical method consists of leaching galena synthetic mixures or concentrates in waste fluosilicic acid (H2SiF6) with hydrogen peroxide (H2O2) and lead dioxide (PbO2) as oxidantsat 95o, electrowinning the (PbSiF6) solution at 35o to produce 99,99%Pb metal, and solvent extraction to recover S, leaving a residue containing eventually present Cu, Ag, and other metal values. The leachate is sent to electrowinning to recover pure Pb metal
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