摘要
Abstract
Compared with the production of sulfuric acid from sulfur dioxide,carbon thermal reduction of sulfur dioxide to produce sulfur is an important method for recovery of sulfur resources from SO2-containing flue gas,which is more valuable in economy.In order to study and develop the technology of reducing sulfur dioxide to sulfur by carbothermal reduction,four types of carbon particles with a particle size of 600-850μm,namely activated carbon,Mongolian lignite,biomass carbon and Xinjiang Hami coal,were selected for the experiment.The optimum reaction temperature range and the best carbon species were obtained by adjusting the loading amount of carbon particles and the reaction temperature.The reaction mechanism was further studied by the chromatographic analysis on the experimental tail gas.Research results showed that the carbon-thermal reaction process was very complex and generates a variety of by-products.The optimum reaction temperature range of carbon thermal reduction was 700℃to 1000℃,and in this range the maximum sulfur yields of various carbons occur.Xinjiang Hami coal was the best carbon among the tested carbon species,which could obtain the maximum sulfur yield.During the carbon thermal reduction of sulfur dioxide to sulfur in the optimum reaction temperature range,hydrogen sulfide,carbonyl sulfur and other intermediate products were regenerated firstly and then converted to be sulfur,rather than direct carbon thermal generation of sulfur,and carbonyl sulfur was the main intermediate product.关键词
二氧化硫/碳热反应/硫黄/反应机理/炭Key words
sulfur dioxide/carbon thermal reduction/sulfur/reaction mechanism/carbon分类
化学化工
