A COAL FLOTATION PROCESS THROUGH PRE WATER TREATMENT OF RECYCLE WATER FROM COAL BENEFICIATION THICKNER AND INSTALLATION THEREOF

摘要

This invention relates to a coal flotation process through pre water treatment of recycle water from coal beneficiation thickener and feeling the treated water into flotation cell comprising the steps of passing first the recycle to a unit for oil removal; feeding the said oil removed water to a unit provided with active carbon filter for removing suspended inorganics of the water; the resultant water next being treated in an unit provided with iron filter for removal of iron; followed by treating said resultant water in a sodium ion exchange process to remove dissolved inorganic and organic compounds of the resultant water to obtain softened water, which is fed into a flotation cell provided with an impeller for proper mixing of the slurry formed on wetting coal sample and transferred into the flotation cell; additional water is added to the cell; high speed diesel oil as a collector being added into the slurry and conditioned to which conditioned slurry, requisite amount of frother is added and is conditioned; the cell is then filled with water to the marked level of the cell and air inlet valve is then opened to supply air in the cell through a compressor; froth floatation samples are collected and analysed to achieve improved yield of 5-11% at same ash level for untreated water, treated water and tap water when added in the flotation cell on maintaining reduced conductivity, turbidity and hardness of the treated water in the flotation cell. The invention relates also to an installation of coal flotation to carry out the process as narrated above.