Some Factors Having the Effect on the Rate of Dissolution of Zircon in Molten Iron Oxide

Abstract

The effect of porosity on the rate of dissolution of polycrystalline zircon specimens in molten iron oxide was studied by rotating cylindrical zircon specimens at a speed of 100rpm in a stationary crucible containing the melt at 1500°C. Zircon specimens were about 20mm in diameter and 30mm in length. The apparent porosity was from about 4 to 30 percent. Then, the effect of quantity of dissolved zircon into molten iron oxide on the dissolution rate of specimen with 15.5 percent apparent porosity was studied under the condition of 100rpm at 1500°C. The dissolution rate was calculated from the change in radius of the specimens. The relation between the rate of dissolution and the porosity of specimens was not given to direct proportion but the former was accelerated as the latter increase. Extrapolating from above relation, the dissolution rate was about 4.8×10-3cm/sec in the case of non-porosity specimen.On the other hand, the penetration of molten iron oxide into specimens depended markedly on its porosity, its penetration was able to be prevented by specimens below at least 15.5 percent porosity. Then, the dissolution rate of zircon specimen in the melt was remarkably affected by the quantity of dissolved zircon into molten iron oxide, and the dissolution rate was reduced below half of it into molten iron oxide, even if the quantity of dissolved zircon was 5 percent. The relation between the dissolution rate (Vcm/sec) and the quantity of dissolved zircon into molten iron oxide (Z, 100wt%=1) was given to next formula.logV=-6.65Z-2.12