Loss on ignition in alumino silicate refractory materials
Scope/Purpose:
This SOPs covers a method for determination of loss on ignition in alumino silicate refractory materials.
Principle:
Loss on ignition of the material is determined on ignited in a muffle furnace at 1025 ± 20°C.
Apparatus/Equipment:
- Platinum crucibles
- Muffle Furnace (1025 ± 20°C)
- Balance
Test Sample
It is prepared for the purpose of chemical analysis by drying a sufficient quantity of the laboratory sample in a glass weighing bottle in air oven at 105 to 110°C.
Procedure:
- Weigh 1.0 g of sample into a previously weighed platinum crucible.
- Introduce it into a muffle furnace and slowly raise the temperature to 1025 ± 20°C. Ignite le mass at this temperature for 1 hour.
- Remove the crucible and cool in a desiccator containing preferably magnesium perchlorate and weigh. Repeat the heating till constant weight.
Calculations:
Loss on ignition % = (A-B) × 100 / C
Where,
A = initial mass in g of the crucible with sample,
B = final mass in g of the crucible with residue after ignition, and
C = mass in g of the sample taken.
Reference Standard: IS 12107: 1987 part -1
