Aluminium and its chemicals are generally produced from its oxidic ores, mainly bauxite through NaOH leaching by Bayer's process. There are other oxidic raw materials such as coal ash, clay etc. which are being explored ...

In Bubbling Fluidized Bed Combustors (BFBC) utilizing coal, efficient combustion requires that feed size of coal particles be in the maximum size range of 2 to 6 mm. This requires that the comminution process be effective. ...

The problems associated with conventional (cylindrical) fluidized beds, viz., fluidization of wider size range of particles, entrainment of particles and limitation of fluidization velocity could be overcome by using tapered ...

With the mandatory requirement of recycling and reuse of electronic scraps arising from printed circuit boards (PCB), the non-polluting separation methods to separate metals and plastics are of growing importance nowadays. ...

It is well known that high rank coals are generally more hydrophobic than low rank coal or oxidised coal. Non-coking coal (sub-bituminous) of the Talcher coal field in India has very high ash content and is believed to ...