Abstract：Thermogravimetric method which was physical method for the accurate determination of free calcium oxide
（f-CaO） insteel slag，was introduced.Steel slag samples with grinding particle size less than 0.075 mm wed to cook. After all the free calcium oxide in steel slag samples was hydrolyzed completely，the thermal decomposition weightlessness of Ca（OH）2 and CaCO3 from free calcium oxide in steel slag at specific temperature points was detected by thermogravimetric method on the thermal analyzer.According to the thermal decomposition reaction equation and the heat decomposition weight loss，the content of the free calcium oxide in the steel slag was calculated.This method had few interference factors affecting the test results，and the test results were accurate and reliable.
2019, Vol. 37 
