ELECTROLYTIC REDUCTION OF COAL AND COAL MODEL COMPOUNDS WITH OXYGENIC FUNCTIONAL GROUPS

摘要

The electrochemical desulfuration technique began in 1980s, which is clean and mild in operation and good in desulfuration effect [1-3].The desulfuration effect of this method can be realized by oxidition at anode. During the process, coal is degraded to different degrees, destroying the structure of coal [4-6]. Although the electrolytic reduction can avoid destroying the structure of coal, the desulfuration result is not good. Our previous study [7] concerning electrolytic reduction of coal shows that pyritic sulfur, the main form of sulfur in coal, is converted from FeS_2 to FeS, making the hydrophilicity of reduced pyrite much larger than that of pyrite in raw coal. So, by combining the electrical reduction with floatation, the desulfuration effect would be enhanced greatly, that is the so-called "electrolytic reduction floatation desulfuration".