Laboratory measurements of sulfur dioxide deposition velocity on marble and dolomite stone surfaces |
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| Institution: | 1. Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100190, PR China;3. School of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing, PR China;4. Swerim AB, Lulea 97125, Sweden |
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| Abstract: | The deposition velocity of SO2 on marble and dolomite stone surfaces in a humid atmosphere was measured as a function of time in the laboratory using continuous monitoring techniques. The deposition velocity of SO2 on marble varied between 0.02 and 0.23 cm s?1, and was generally observed to decrease with time. The deposition velocity of SO2 on dolomite varied between 0.02 and 0.10 cm s?1, and gradually increased over the first 2000 ppm-h of exposure. For both types of stones, the deposition velocity increased significantly when condensed moisture was observed on the stone surface. Chemical analysis of the stone samples indicated that the SO2 deposited reacted with the stone materials to form gypsum (CaSO4·2H2O) on the marble surfaces and gypsum and epsomite (MgSO4·7H2O) on the dolomite surfaces. |
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