A coal preparation plant is a facility that washes coal of soil and rock, crushes it into graded sized chunks, stockpiles grades preparing it for transport to market, and more often than not, also loads coal into rail cars, barges, or ships.

What is the meaning of washery?

: a place at which material (as wool, ore, coal, or crushed stone) is freed from impurities or dust by washing.

What is meant by coal washery?

noun An establishment where coal is cleaned from slate and other impurities by mechanical processes which use water and take advantage of the difference in specific gravity of the coal and its impurities.