New sorbents from pyrite ash waste for H2S reduction from waste gases

Abstract

High coal consumption leads to both environmental pollution and the destruction of resources. Minimizing resource destruction and environmental pollution is the main direction of our research. The IGCC technology can increase the efficiency of coal use and in the same time reduces the intensity of pollution in the process of converting coal into electricity. Many researches has been done regarding the removal H2S, CS2, COS, mercaptan, thioethers, disulfide, thiophene from flue gases. The paper is part of the current concerns regarding the prevention of air pollution with sulfur compounds, these being the most important pollutants of the atmosphere. One of the main sources of air pollution with sulfur compounds is the burning of fuels, especially coal and petroleum fuels, in order to obtain energy. The need for advanced desulfurization is required by the existence in the flue gases of sulfur compounds: H2S, CS2, COS, mercaptan, thioethers, disulfide, thiophene. Current guidelines regarding the pollution of the atmosphere with sulfur compounds concern the desulfurization of sulfur raw materials or intermediate gases when the the predominant form of sulfur compounds is hydrogen sulfide. Many researchers have used as sorbents metal oxides used as monocomponent materials or in mixture, multicomponent material. The most efficient oxides proved to be the oxide of Fe, Zn, Mn, as monocomponents or in mixture with oxides of Ti, Al, Si, aiming to obtain stable sorbents over time, with high retention capacity. Since the amount of pyrite waste from the manufacture of H2SO4 is large, we tried to capitalize on this waste by trying to retain H2S.