Use of stable isotope measurement to evaluate the origin of sulfur in gypsum layers on limestone buildings

Article Abstract:

The use of sulfur isotope measurements allows for a thorough investigation of the origin of sulfur and the mechanism of crust formation on monuments in Antwerp, Belgium. Results from the sampling methods yielded different isotopic compositions in gypsum crusts on monuments and especially in the harbor area where a petrochemical plant is located. The other sources of SO2 accounted for the variations in isotopic composition which caused the enrichment of 34S in the weathering crusts in the center of Antwerp. An example is the local brickyard industry which greatly affects the isotopical composition of SO2 and the weathering layers on stone.

All Other Basic Inorganic Chemical Manufacturing, CHEMICALS AND ALLIED PRODUCTS, All Other Nonmetallic Mineral Mining, Miscellaneous nonmetallic minerals, Chemical and fertilizer mining, not elsewhere classified, Sulfur, Other Chemical and Fertilizer Mineral Mining, Gypsum, Isotopes, Chemical industry, Antwerp, Belgium (City), Nonmetal mining, Isotope geology

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Fuel rich sulfur capture in a combustion environment

Article Abstract:

A study of fuel-rich sulfur capture reactions of calcium sorbents in the combustion environment of a natural gas furnace indicated that levels of sulfur capture were high in a fuel-rich environment. The utilization of calcium increased as the concentration of sulfur increased. The lean capture showed no dependence on the fuel-rich sulfur capture level, but it was weakly dependent on the concentration of sulfur. The high captures obtained in the fuel-rich environment disappeared in the fuel-lean environment when calcium sorbents were used.

Chemical reactions, Fuel research, Sorbents

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Mercury speciation in coal combustion and gasification flue gases

Article Abstract:

Mercury (Hg) is a volatile element and is present in the vapor phase of combustion and gasification of flue gases. Experimental methods on Hg speciation have identified elemental Hg as the most thermodynamically stable form in its oxidation state at high temperatures. As temperature decreases, elemental Hg reacts with oxidants in combustion flue gas to produce mercuric compounds which are reactive, water-soluble and highly volatile and therefore can easily enter the atmosphere.

Coal gasification, Mercury, Mercury (Metal), Flue gases

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