Practice of adding coarse middling product rewashing link in coal jigging process

In jigging separation of anthracite, a great amount of clean coal is lost in refuse and middling products. To cope with this situation, a coarse middling products rewashing link is added in the jigging process. Practice shows that a favorable economic result has been obtained due to stability of the heavy materials bed in the washbox's middlings compartment and decrease of entrainment of clean coal in refuse and middling products.