特殊アルミナセメントの研究 (第3報) : 燒成法と熔成法の製品の比較試驗

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In continuing the previous reports (I and II), various different points of properties between specially sintesed alumina cement and ordinary fused product, which were produced from alumina residue obtained as byproduct from aluminium metal reclaiming plant and slaked lime with small addition of bauxite, aluminoms shale or pyrite cinder, were fully compared on heir chemical compositions, physical properties, strengths of 1:2-plastic mortar at 3, 7 and 28 water curing days. The special alumina cement, which was reported by the present authors to be produced by the special sintering process in the foregoing reports, contained small amount (about 2-5%) of free lime, which gave effect on setting time of the cement, and also contained small amount (3-5%) of insoluble or inactive residue of α-alumina of corundum type, which was introduced from the raw material of the alumina residue as bypsoduct of aluminium reclaiming or remelting plant. These incompletely combined components could be diminished by adding very small amount (0.5-1%) of calcium fluoride (CaF2) or fluorspar at the sintering the raw mixture at about 1300-1350°C. Nextly, three samples of (1) raw material of alumina residue, (2) sintered alumina cement and (3) fused alumina cements were tested by the differential thermal analysis and observed, on the curves of the thermal analyses, several turning points owing to the free lime and free corundum alumina contained in the (1) alumina residue and (2) sintered alumina cement.
社団法人日本セラミックス協会の論文

特殊アルミナセメントの研究 (第3報) : 燒成法と熔成法の製品の比較試驗

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