How to get uniform calcination using lab scale muffle furnace for sludge rich in silica, alumina, iron and having total carbon content - 8%?

Target temperature: 600 deg. I have tried ramping the furnace @ 10 deg/min using fine sieved sludge ( size < 300 microns) in a porcelain crucible but they sludge layer on top gets calcined but...

11 February 2020 7,266 6 View