Low energy pelletisation of ash residues

Transporting and handling fine powders can cause environmental problems

Low energy pelletisation of ash residues

Queen’s researchers, working with TCBB, examined the issue of low energy pelletisation of ash residues.

Transporting and handling fine powders can produce dust, causing environmental problems, such as contaminating air, soil and water. However, after pelletisation some dangerous materials , such as asbestos, can be easily transported. Pellet form is the best option, due to its physical properties, high strength and suitability for storage.

Using the process known as ‘cold bonding’ which doesn’t require any heat or pressure, the pellets are created with tumble and growth tunnel agglomeration equipment. Eco-friendly liquid binders provide an impermeable outside layer that don’t allow moisture into a pellet, giving it an unique ‘eggshell’, significantly enhancing its skin strength.

Ashes with high content of metals could be used as aggregates for concrete, once the metals are leached from them. For ashes with high nutrients content, pellets can be used as fertilizers, disintegrating and releasing the nutrients slowly, while high carbon content ashes, when mixed with biomass, can be used as fuel, because they have to be dense.

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