Sulf-X process

Flakt-Boliden process aqueous carbonate SULF-X process Conosox process... 

The Sulf-X process, which is the only known system using ferrous sulfide for SO2 removal, has not been developed to commercial status however, the chemistry is sufficiently novel to warrant at least a brief mention. A more detailed description and economic evaluation has been prepared by Steams-Rogers Engineering Corporation for EPRI (Keeth et al., 1983), and is the basis for the discussion that follows. 

The Steams-Rogers study concludes that the Sulf-X process has the potential for lower capital and operating cost than the Wellman-Lord process however, it has several potential problem areas, including the operation of a high temperature calciner the handling of three different solid reagents pyrites, coke, and sodium sulfate and the need to circulate a complex slurry through much of the process. 

Sulfex [Sulfide extraction] A process for removing heavy metals from waste streams by adding ferrous sulfide to precipitate them as their sulfides. Developed by the Permutit Company and now owned by U.S. Filter/Warrendale. Not to be confused with SULF-X or Sulph-X. 

SULF-X [Sulfur extraction] A regenerable flue-gas desulfurization process in which the sulfur dioxide is absorbed by aqueous sodium sulfide in a bed packed with pyrite. Ferrous sulfate is produced this is removed by centrifugation and calcined with coke and fresh pyrite. Sulfur vapor is evolved and condensed, and the residue is re-used in the scrubber. Piloted in the mid-1980s. Not to be confused with Sulfex or Sulph-X. 

Sulph-X A process for trapping sulfur in coal combustion. A proprietary mixture of inorganic salts, including sodium chloride, is mixed with the coal and combines with the sulfur dioxide so that it remains fixed in the ash instead of evolving with the combustion gases. Invented in China and developed in Australia in the 1990s by Coal Corporation Pty. Not to be confused with Sulfex or SULF-X. 

Sulf-X Score Process Western Correctional Inst. Pittsburgh, PA Pittsburgh Env. Engrg, Systems Coal 3.5% Sulfur... 

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