Coal breaker - WikipediaA perforated metal plate moved up and down about 180 times a minute inside the tub. The movement of the tub created upward water pressure. The lighter coal was pushed toward the top of the tub, where paddles on a conveyor belt scraped it off the top of the water and down a chute for further processing, while the.coal breaker processing information water treatment,Anthracite Preparation - 911 MetallurgistMar 18, 2017 . The entire anthracite industry uses about 320,000 gal. per min. of water for this purpose or 800,000 tons of water per day. As this water leaves the breakers, it contains fine solids—coal, slate, pyrite, and clay—and is then called silt or slush; as slush is the term most commonly used, it will be employed.