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https://doi.org/10.53939/15605655/2022_2_17

Dosmukhamedov N.K., Egizekov M.G., Zholdasbai E.E., Kurmanseitov M.B., Argyn A.A.

Abstract: General concept is proposed for a technology of purifying waste gases of TPPs and metallurgical enterprises from SO2 and CO2 . The fundamental possibility of carrying out the process of regeneration of carbonate-sulfate melt with natural gas is shown. Based on experimental work it has been established that the process of regeneration of a carbonate-sulfate melt with natural gas provides high rates of sulfate reduction and the achievement of maximum up to 99% sulfur recovery from the melt in the form of H2 S. It has been determined that the removal of sulfur from a carbonate-sulfate melt by bubbling with natural gas can be carried out in the operating temperature range of an absorption column for purifying exhaust gases as 500-550 ºС. It is shown that the process of regeneration of a carbonate-sulfate melt with natural gas is a relatively simple one-stage process that proceeds at a high rate. This allows the regeneration column to be integrated with an absorption column where sulfur is captured from the exhaust gases. The removal of sulfur in the form of H2 S provides considerable range of choice in terms of the final commercial product: either sulfuric acid (by dry combustion of H2 S) or elemental sulfur (by the Claus process), both have significant commercial value. The proposed method for the regeneration of a carbonate-sulfate melt simplifies the technology of purifying waste gases from sulfur dioxide with a carbonate melt of alkali metals. Moreover, it can be easily integrated into the general technological scheme of existing metallurgical enterprises without special material and energy costs.
Keywords: waste gases, sulfur dioxide, absorption, carbonate-sulfate melt, regeneration, natural gas, sulfur.

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