Distribution of As within Magnetic and Non-Magnetic Fractions of Fluidized-Bed Coal Combustion Ash

Separation of coal ash into magnetic and non-magnetic fractions facilitates their utilization when processed separately. Due to desulphurization additives added during the fluidised-bed combustion, often contain elevated CaO levels (while concentrates are typically rich in Fe2O3). Both Fe2O3 known for ability bind As whose distribution is a crucial parameter terms proper these fractions. Therefore, study deals with partitioning within fluidized-bed combustion ashes. Two different (successive) procedures dry separation were used separate each strongly magnetic, less fraction. optimal utilization, concentrations other target elements evaluated compared. Magnetic from first step (in vibrofluidized state) contained 60–70% Fe2O3, separated manually out residues after 26–41% 2.4–3.5% Fe2O3. Arsenic highest gradually decreased increasing content The dominant association studied samples was (r = +0.909) SO3 +0.906) whereas its joint occurrence improbable ?0.834).