Fulfill the screen test and float-and-sink analysis for high sulfur coal gangue from a Guizhou coal mine, analyzed the washability of its tail coal. Seen from the results： most of sulfur in sample is pyrite, the sulf...Fulfill the screen test and float-and-sink analysis for high sulfur coal gangue from a Guizhou coal mine, analyzed the washability of its tail coal. Seen from the results： most of sulfur in sample is pyrite, the sulfur content of different particle classification shall be reduced with the decreasing of size and specific gravity, most of sulfur distributed in the coal particles with large-size and high specific gravity. Part of sulfur may be eliminated through special gravity separation, however, most of inorganic sulfur should be removed with the combination of floatation process.展开更多
The coal processing methods used at the Zarand coal washery plant are the heavy medium bath,jigs,and flotation.The coal-containing materials that are fed to the plant are acquired from different mines,and they have di...The coal processing methods used at the Zarand coal washery plant are the heavy medium bath,jigs,and flotation.The coal-containing materials that are fed to the plant are acquired from different mines,and they have different washability properties.In this paper,the validity of Mayer curve (M-curve),the conventional method for determining coal washability,was evaluated on blending of raw coals that are fed to the plant.Washability curves were prepared for the hand-blended samples and compared with the washability predicted by the Mayer curves.Different samples from different seams and mines were blended by hand in 50:50 ratios,and sink and float tests were performed;the resulting washability curves were in good agreement with the washability curves predicted using the Mayer method for the same blending ratio.This work resulted in the preparation of the optimum plant feed that can be achieved from the blending of different coal samples to produce the best plant yield at a given ash content.展开更多
文摘Fulfill the screen test and float-and-sink analysis for high sulfur coal gangue from a Guizhou coal mine, analyzed the washability of its tail coal. Seen from the results： most of sulfur in sample is pyrite, the sulfur content of different particle classification shall be reduced with the decreasing of size and specific gravity, most of sulfur distributed in the coal particles with large-size and high specific gravity. Part of sulfur may be eliminated through special gravity separation, however, most of inorganic sulfur should be removed with the combination of floatation process.
基金supports for this work that were received from the Zarand coal washing R&D center and Science and Research Branch (Tehran) of Islamic Azad University
文摘The coal processing methods used at the Zarand coal washery plant are the heavy medium bath,jigs,and flotation.The coal-containing materials that are fed to the plant are acquired from different mines,and they have different washability properties.In this paper,the validity of Mayer curve (M-curve),the conventional method for determining coal washability,was evaluated on blending of raw coals that are fed to the plant.Washability curves were prepared for the hand-blended samples and compared with the washability predicted by the Mayer curves.Different samples from different seams and mines were blended by hand in 50:50 ratios,and sink and float tests were performed;the resulting washability curves were in good agreement with the washability curves predicted using the Mayer method for the same blending ratio.This work resulted in the preparation of the optimum plant feed that can be achieved from the blending of different coal samples to produce the best plant yield at a given ash content.
