Rolla, MO: U.S. Department of the Interior, Bureau of Mines, RI 8059, 1975 Jan; :1-34
In producing feed for a lead blast furance, concentrates analyzing 70 to 80 pct Pb are sintered to produce a physically acceptable low-sulfur product that contains only about 50 pct Pb. Mixtures of PbS with varying amounts of SiO2, CaO, Fe2O3, and ZnS were heated in an oxidizing atmosphere at 1,000 deg C; the products were cooled and examined to determine the problems involved in producing sinter with substantially higher lead levels. Microscopic and electron microprobe studies of the products as well as experimental and commerical sinters indicate that sinters consist essentially of lead silicates, lead-zinc silicate, calcium zinc silicate, and spinel (ferrite). Lead oxide and lead sulfate areas appear to result from insufficient mixing of the materials prior to sintering. The data give an insight into the process and show that sintering results from a complex interaction of all constituents and that sintering is not simply a matter of diluting the mixture to control the oxidation of lead sulfide.
IH; Report of Investigation
NTIS Accession No.
Rolla, MO: U.S. Department of the Interior, Bureau of Mines, RI 8059
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