How to test ignition loss for silica/SiO2?
During the burning process of silica products, volatile substances include carbon dioxide, combined water and a small amount of sulfur, fluorine, chlorine and organic matter. The loss of volatile components is closely related to the burning time of temperature. We should regard the change of the quality of the sample as the algebraic sum of all kinds of chemical reaction quality increasing or decreasing. When calculating the total percentage, if the result of burning reduction is taken into account, the composition change of each component after ignition is to be converted.
Ignition loss for Silicon Dioxide:
○ Equipment : Platinum crucible, high temperature furnace, analytical balance
○ Method
① double sample measurement
② Weigh 2g of sample, counted as m0, put it into the bottom of the platinum crucible, and weigh m1
③ burning at 1000 ± 25 °C 2h.
④ put on the cover and move it to a desiccator for cooling, and weigh m2
○ Calculation
Ignition loss X=m1-m2/m0
M0 is the weight of the sample
M1 is the weight of the weighing flask and sample before heating
M2 is the weight of the weighing flask and the sample after heating
SiO2 content=1-X