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Use of Vapor Phase Complexation for the Extraction of Antimony from Sulfidic Wastes.
Westphal BR; Hager JP
Paper in 2nd Int'l Symp--recycling of Metals & Eng Mat Miner Met & Mater Soc Pp 39-58 :39-58
The extraction of antimony from sulfidic wastes has been investigated. Using a special double-zone transpiration reactor, the vapor transport chemistry of antimony sulfide has been established. By varying the sulfur potential in the carrier gas, through the use of an h2s/h2 mixture, it was determined that two transport mechanisms are possible: sb2s3(s,1) = sb2s2(g) + 1/2 s2(g) and sb2s3(s,1) = sb2s3(g). Moreover, if arsenic sulfide vapor is present in the carrier gas, the transport rate of antimony sulfide can be enhanced by several hundred percent due to the formation of the vapor complex assb3s6(g): 6sb2s3(s) + as4s6(g) = 4 assb3s6(g). The Gibbs free energies have been determined for the vapor transport reactions. The results have been used to construct vapor pressure-stability diagrams for the sb-s-o system and to identify process conditions for the treatment of sulfidic wastes containing arsenic and antimony. Recommendations are also presented on the selective deposition of arsenic and antimony from the discharge gas stream of a transport reactor.
IH; Final Contract Report;
Paper in 2nd Int'l Symp--recycling of Metals & Eng. Mat.; Miner., Met., & Mater. Soc., Pp 39-58
Colorado School of Mines
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