Abstract
In this paper, in order to eradicate the high energy consumption, environmental pollution of As2O3 dust and hazardous arsenic–alkali residue in a traditional arsenic–bearing antimony white (A–BAW) disposal in pyrometallurgical process of jamesonite, a novel aqueous alkaline oxidation was proposed to directly synthesize sodium antimonate and recover valuable Pb and Zn. Based on the thermodynamic analysis and experimental research, sodium antimonate was prepared at [NaOH] = 8 mol/L, η[H2O2] = 1.4, ratio of liquid to A–BAW = 3:1, and reaction temperature = 80 °C. The as–prepared NaSb(OH)6 was a cubic structure having a uniform size of 5–10 um. The mother liquor was purified at 2.0 times of theoretical Na2S dosage and 10 °C as a result of PbS, ZnS and Na3AsO4·12H2O richened in crystal slags with the precipitation ratios of 99.64 % (Pb), 99.75 % (Zn) and 95.81 % (As), respectively. Furthermore, PbS and ZnS were effectively recovered by water–leaching with precipitation ratios for 99.99 % (Pb) and 99.98 % (Zn). This novel approach not only comprehensively recovers valuable metals and eliminates arsenic pollution but also realizes an economically sustainable utilization of antimonial resources from the pyrometallurgical process of jamesonite.
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