Lead Smelter Flue Gas Desulfurization by the Citrate Process.
Nissen-WI; Crocker-L; Martin-DA
Ch 52 in World Mining & Metals Tech Port City Press Baltimore Maryland 2:825-854
The federal Bureau of Mines developed a process for removing so2 from stack gases. The process comprises absorption of so2 in an aqueous solution of sodium citrate, citric acid, and sodium thiosulfate, followed by reaction of the absorbed so2 with h2s to precipitate sulfur and regenerate the citrate solution for recycle. A pilot plant was operated at the Bunker Hill Company lead smelter in kellogg, Idaho, to assess the feasibility of using the process for flue gas desulfurization. The operation demonstrated that (1) more than 95 pct of the so2 could be removed from the lead smelter sintering furnace tail gases, (2) regeneration of the citrate solution with h2s and precipitation of sulfur in conventional stirred vessels was readily controlled and highly efficient, (3) the precipitated sulfur could be continuously recovered as a 99.5-Pct- pure product by kerosine flotation and melting, and (4) the 77- to 79-pct h2s gas used for sulfur precipitation could be readily produced from pilot plant product sulfur, natural gas, and steam.
Ch. 52 in World Mining & Metals. Tech., Port City Press, Baltimore, Maryland, V. 2, PP. 825-854