ジルコン煉瓦の諸性質に及ぼすクロム化合物添加の影響

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Various chromium compounds were added into zircon up to 5 wt% in order to investigate their effects on sintering and dissociation of zircon after firing at 1500°C and 1600°C.Corrosive resistances of fired products containing their chromium compounds for pouring pit refractories was studied.Na2Cr2O7⋅2H2O, Fe2O3⋅4CrO3⋅H2O, Fe2O3-Cr2O3 solid solution, Fe2O3 and Cr2O3 equimolecular mixture and Masinloc chromite promoted sintering of zircon. MgO⋅Cr2O3, (CrO3+MgO) aq., CaO⋅Cr2O3, (CrO3+1/2 CaO) aq., FeO⋅Cr2O3, Fe2O3-3Cr2O3 solid solution, ferrochrome oxide and {CrO3+Fe(OH)3} aq. promoted slightly it. But Cr2O3, amorphous Cr2O3, CrO3, CrPO4⋅2H2O, ferrochrome and {CrO3+Cr(OH)3} aq. did not to promote sintering of zircon.Among the chromium compounds which promoted sintering of zircon, Na2Cr2O7⋅2H2O promoted dissociation of zircon, and CaO⋅Cr2O3, (CrO3+1/2 CaO) aq. and Masinloc chromite did slightly. The others did not.Concerning the corrosive resistance of their fired products, Cr2O3, CrO3, MgO⋅Cr2O3, (CrO3+MgO) aq., CaO⋅Cr2O3 and (CrO3+1/2 CaO) aq. improved it, but Fe2O3-Cr2O3 solid solution and Masinloc chromite increased penetration of slag.Conclusively, zircon brick added a little amount of both Cr2O3 and (CrO3+MgO) aq. or (CrO3+CaO) aq. had lower apparent porosity and better corrosive resistance.
社団法人日本セラミックス協会の論文
1973-09-01