6 ·Coal washing Coal that comes from a mine is a complex mixture of materials with a large variety of physical properties In addition to the coal itself pieces of rock sand and various minerals are contained in the mixture Thus before coal can be sold to consumers it must be cleaned The cleaning process consists of a number of steps that results in a product that is
·Coal Preparation Process Crushing & Screening Raw coal is transported to crushing workshop by belt conveyor First it is pre screened by a circular vibrating screen with a sieve opening of 50 mm Coal washing usually include two main coal preparation processes density separation and flotation separation
·The coal washing process was the only foreground process that required an on site investigation of plant level operations data The remaining processes were considered background processes for which data were collected from commercialized LCA databases
Most coal requires some preparation before use Preparation may range from simply crushing to provide a size consist suitable for certain types of boilers to extensive size reduction and cleaning to remove sulfur and ash forming mineral matter At present
·Coal washing technologies vary widely due to wide variations in the properties and uses of coal When selecting the process equipment for a particular washing technology many operational factors play a vital role which if ignored can lead to
·The coal washing process which is usually used for of removal of contaminants also comes with tremendous environmental and health benefits It not only reduces the ash content of coal but also improves its heating value and removes small amounts of other substances such as sulfur and hazardous air pollutants
·APPENDIX B — PLANT DATA FOR COAL WASHING PROCESSES 69 vii TABLES No 1 Coal preparation processes in Canada during 1978 80 2 2 Operating data for jig plants 1978 80 5 Comparison of process use in Canada and other major coal producing countries 3 2 Jig separation characteristics 5 3 Size distribution of jig feeds reconstituted 6
Dry Cleaning Process Dilip Kumar Deepak Kumar in Sustainable Management of Coal Preparation 2018 Abstract Dry coal cleaning has claimed an important place in the current coal processing technology The most important and reliable plants include rotary breakers air jigs FGX separators air dense medium fluidised bed separators radiometric sorters and others
Most of the coal presently being consumed is by direct combustion of fi nely pulverised coal in large scale utility furnaces for the generation of electric power Currently the cleaning of the majority of run of mine coal is con ducted by heavy medium separation jigs and chemical fl otation ese techniques use water as a separation medium
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