Froth Flotation Technology for Coal Slurry Beneficiation

A process for the recovery of low ash coal from beneficiation and recovery processes, such that it can be admixed with inferior raw coal to produce better quality coke that can be used in metallurgical operations.

The process provides a process for the recovery of finest cleans from coal slurry which comprises conditioning slurry of fine coal particles of size below -.5 mm by treating with frothers in a ratio of 1:10 and hydrocarbon reagents in a ratio of 1.25 to 1.5 under stirring for 8 hours, at a temperature of 25 to 30°C passing the conditioned slurry through a plurality of flotation cells, removing the tailings by known methods, subjecting the resultant slurry to vacuum filtration to obtain filter cake containing finest cleans.

• Individual design of flotation Cell with automatic selfÂ?suction of input slurry from conditioner.
• Belt discharge Rotary drum vacuum filter in place of Rotary disc filter.
• Use of commercially available synthetic frother instead of pine oil.
• Percolating bed gravity filtration pond for drying of tailings instead of dewatering system.
• Use of low powered indigenously designed Emulsifier
• Completely closed water circuit (zero discharge)
• No water and air pollution