Ash as an alternative source of raw materials
Resumen
The objective of the work is to study the aluminosilicate
fractionation from fly ash, physical and mechanical properties of fly ash
derived from the Thermal Power Plants (TPP) wastes. Ash, carbon
concentrate (unburned carbon), ash concentrate and products of their
treatment with reagents were tested by optical methods. The particle
morphology of the objects of research was studied with the scanning
electron microscope REM-100. The composition of the ash phases was
investigated using the X-ray diffractometer DRON-2. A dispersed analysis
of the TPP fly ash suggests a conclusion that it is advisable to separate
particles of a narrow grain-size class within the range from 40 to 150 μm
with an ash content of about 33%. The first product may be enriched by
flotation method. Such a coal product may be used as a reducing medium
in metallurgical processes, agglomeration, etc. The calorific capacitance of
the concentrate is about 6000 kcal/kg (25000 kJ/kg).