Mercury Capture on Coal Combustion Fly Ash

摘要

The following conclusions can be drawn from the results presented:rn1. There appears to be a direct correlation between carbon content and mercury partitioning among individual ash samples.rn2. There is a direct relationship between carbon content and mercury-sorbing capacity of the bulk ash samples as demonstrated in the loading experiments, although this phenomenon is not reflected by the information on the low- and high-carbon fractions.rn3. The mercury-sorbing capacity of the inorganic fraction is extremely low with respect to carbon present in the ash; however, the amount of carbon remaining, in the ash may not be a good indication of the capacity of the ash to capture mercury during the combustion and ash collection processes.rn4. Carbon appeared in several distinct forms in the ash. A strong possibility exists that there may be significant differences between the mercury-sorbing capacities of these various carbon forms.rn5. The mercury-sorbing capacity of ash studied in this research was highly temperature-dependent. A room temperature variation of only 3° -5 °Fahrenheit significantly affected the sorbing capacity of the ash as it was being loaded. Room temperature fluxuations were evident in the uptake curves of ash being loaded, making interpretation of uptake curves difficult. Thermostating the ash somewhat reduced this phenomenon.