Recovery Of Clean Coal Research Articles

Application of a Mozley mineral separator for treatment of coal washery rejects

In some coal washery operations there is considerable loss of coal value due to inefficient operation of the fine coal treatment circuit. Recent developments in the use of various gravity equipments in fine-coal beneficiation have been discussed and their relative merits have been compared. The possibility of using a Mozley mineral separator for processing of flotation tailings and recovery of clean coal has been examined on the basis of the investigations carried out. Laboratory scale experiments are reported using a fine coal sample from waste tailings of a coal preparation plant. The results of optimisation of process variables and co-relation developed between the operating variables of the equipment and the yield and ash content of the product have been presented. The possible application areas are discussed including fine coal beneficiation and refuse treatment.

The application of a superconducting magnet system to the cleaning and desulphurization of coal

The basic requirements for high gradient, high intensity magnetic separation are reviewed and process limitations are emphasized. The principle innovations of the superconducting magnet system design for this work include an annular quadrupole magnet and corresponding slurry channel operating in an open field without secondary poles. The transverse secondary circulation set up in the slurry through the primary orbital flow is used to transport all particles into the region of high field intensity. Two Pennsylvania coals with high pyrite contents were treated. Test conditions and results are described and discussed. One of the coals yielded 81% recovery of clean coal and over 85% rejection of pyrite. Possible further improvements are discussed.