ABSTRACT
The development of improved coal beneficiation methods has been
Coal Project was established with funds provided by the Iowa Legis-
which are finely disseminated throughout the coal [1].
When the Iowa coal Project was launched, a dual attack was made
tion were those in commercial use which seemed to have the lowest
removed only coarse refuse. Since Iowa coal also contains finely
ceed to develop these methods. The separation methods selected for
agglomeration, hydrocyclones, heavy-media cyclones, and high-gradient
magnetic separation. All of these methods are designed for cleaning
Since funds and human resources are never unlimited, the devel-
opment of these methods has been uneven. While methods based on
and laboratory development and are being demonstrated in larger
cyclones which do not lend themselves to small-scale systems are being
pretreatment of coal fines to enhance the difference in surface prop-
optimization of process conditions. In addition, various combina-
methods complement each other.
