Autogenous Process for Low-Ash and Low-Sulfur Coal Production: Final Report.

摘要

The novel feature of the autogenous-carrier flotation process (ACF) is the use of coarse coal concentrate as a reagentized carrier for ultrafine coal; in other words, it takes self-generated reagentized fine particles as carrier for ultrafines. Special techniques have been developed to condition the carrier particles, such as using the normal coal-flotation reagents to condition and float the fine coal; then, whole or part of the froth is introduced into the ultrafine coal stream. Since the reagentized fine coal froth (carrier) carries over to the ultrafine coal (carried), reagent consumption is reduced, and moreover the selectivity and separation efficiency is increased. This investigation is the first of its kind where the autogenous-carrier flotation process has been tested for cleaning of US coals. The parameters of the ACF process have been studied. Simulation of the continuous process has been tested. The mechanisms of this process have been discussed. 11 refs., 23 figs., 8 tabs. (ERA citation 14:021605)