Advanced Physical Fine Coal Cleaning: Microbubble Flotation: Final Report, Volume 1

摘要

The primary objective is to perform large-scale (1 tph of feed) tests that yield sufficient technical and economic data to permit decisions to be made for full-scale commercial testing and eventual operation of advance physical fine coal cleaning processes. Specific objectives: significant pyritic sulfur removal - the advanced process should reduce pyritic sulfur by a significant amount, more than is possible with state-of-the-art fine coal cleaning; ash content of not more than 2 weight percent (dry basis) in the clean coal; an energy recovery of 80 percent, based on the total Btus in the ROM coal compared with Btus in the clean coal; and as a measure to assure ease of handling and transportability, a clean coal and refuse surface moisture content not greater than 30 weight percent. BNI's process, which uses microbubble flotation, had shown promising results. The program included laboratory and bench-scale tests with selected coals to confirm the suitability of microbubble flotation for those coals, and to define various test parameters for the 1 tph POC test work. After the 4-month POC test program, test data would be used to prepare a conceptual design for a commercial size plant. 76 figs., 80 tabs. (ERA citation 14:016914)