Ash and Slag Characterization for Low-Rank Coals.

摘要

The viscosities of seventeen lignite and subbituminous coal ash slags have been measured in a reducing atmosphere over the temperature range of roughly 2100 to 2700 exp 0 F using a rotating bob viscometer. Recently published correlations of viscosity-temperature behavior with composition, developed in France for metallurgical slags, were tested using the low-rank coal ash slag composition data. One of these, the Urbain correlation, is based on the SiO sub 2 -CAO-Al sub 2 O sub 3 ternary phase diagram. The low-rank coal slags were subdivided into three groups, based on a parameter of the Urbain equation, roughly proportional to silica content. The Urbain equation, as modified to reflect subdivision by silica content, gave acceptable correlations (agreement of calculated and experimental viscosities within 30%) for 50% of the slags and marginally acceptable correlations (agreement within 60%) for 70% of the tests. 8 figures. (ERA citation 08:035051)