Method for determining free radicals in CaO—Al2O3 series oxide melts

A method for determining a free radical relative content of free radicals generated from CaO—Al2O3 series oxide melts, comprising:

• dividing a CaO—Al2O3 series oxide powder into two aliquots of a same mass;
• tamping the two aliquots inside two identical corundum crucibles, respectively;
• placing the two corundum crucibles with the two aliquots into two high temperature furnaces, wherein a first corundum crucible having a first aliquot is placed in an ordinary high temperature furnace and a second corundum crucible having a second aliquot is placed in a static magnetic field high temperature furnace;
• heating the two aliquots at a same temperature for a same time period followed by quenching;
• drilling out a first cylindrical sample with a first diameter and a first height from the first corundum crucible and drilling out a second cylindrical sample with a second diameter and a second height from the second corundum crucible, wherein the first diameter is the same as the second diameter and the first height is the same as the second height, and the first and the second cylindrical samples comprise melts located at bottoms of the two corundum crucibles and slag reaction interfaces, wherein the two corundum crucibles are placed in the furnaces and the slag reaction interfaces are located between the oxide melts and the bottoms of the corundum crucibles;
• grounding the first cylindrical sample and the second cylindrical sample into a first powder sample and a second powder sample, respectively;
• measuring, by a chemical analysis, a total mass content of CaO in the first and second powder samples;
• measuring, by X-ray diffraction, a first mass content of calcium aluminate phase in the first powder sample and a second mass content of the calcium aluminate phase in the second powder sample;
• calculating a first reaction mass content of CaO from the first mass content of the calcium aluminate phase in the first powder sample and a second reaction mass content of CaO from the second mass content of the calcium aluminate phase in the second power powder sample;
• dividing a difference between the first and the second reaction mass contents of CaO by the total mass content of CaO to produce a resulting ratio;
• and
• determining a free radical relative content of free radicals generated from the CaO—Al2O3 series oxide melts using the resulting ratio.