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Abstract
Froth Flotation is the most widely used. method for the beneficiation of fine coals. Recently, however, the application of froth flotation is being expanded to treat collieries wastes and coal washing plants tailings. This thesis presents the results of tests conducted to demonstrate the feasibility of using froth flotation process to recover clean coal from El- Magharah colliery wastes. A sample was collected from El-Magharah waste dumps and prepared for froth flotation tests. This material was characterized prior to carrying out the laboratory - scale tests using, a Denver flotation cell of two litres capacity. Preliminary tests were performed without adding any reagents to determine the natural floatability of the coal particles. Six reagent systems were suggested to be examined using three types of collectors [kerosene, fuel oil (diesel oil) and heavy oil (mazote)] and two types of frothers [camphor oil and methyl isobutyl carbinol (MIBC)]. These particular types of frothers were chosen in order to avoid the use of the toxic ones, such as crysilic acid and creosote. The effect of pH on these chemical systems was studied. The coal waste sample, which contained 57.5 % ash was, processed using the six reagent systems. Typically, clean coal products containing 11 - 25 % ash were obtained at 22- 44 % yield. All reagent systems have worked well, however, the best results were obtained with MIBC and heavy oil system with regard to both clean coal grade and yield, particularly, when the prices of chemicals are considered as a priority.