The invention discloses a
steam coal all-grade selected and simplified heavy medium
separation process. The process comprises classification; separation of coarse-particle coals; separation of fine-particle coals; medium and water removal of coarse-particle products; circulation,
recovery and replenishing of coarse-particle
coal mediums; medium and water removal of fine-particle products; and circulation,
recovery and replenishing of fine-particle
coal mediums.
Coal slime is separated and recovered; after raw coals are classified, oversize products serve as the coarse-particle coals to enter a non-pressure three-product heavy medium
cyclone for separation, and undersize products serve as the fine-particle coals to enter a pressure three-product heavy medium
cyclone for separation; and after magnetic-separated tailing is concentrated, dehydrated and recovered, concentrate
coal and medium coal products are doped. The coarse-particle coals are separated by the heavy-medium
cyclone, so that the high-
density separation of low-density suspension is realized, the separation density is reduced, the medium consumption is effectively reduced, and the wet mud removing link before separation of the fine-particle coals in a conventional process is saved; and the process is wide in application range, simple, convenient for operation, high in separation efficiency, flexible in product structure, low in production operation cost, low in
capital investment and accordant with national environment protecting requirements.