特殊アルミナセメントの研究 (第5報) : 明礬石溶出滓よりの製法

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In continuing the previous studies (This Journal, 58, No. 651, 300-304 (1950); 59, No. 655, 18-21 & No. 665, 533-537 (1951); 60, No. 675, 386-390 (1952)), the results of further studies were reported, as following: (1) Alunite samples were obtained from Shoko-Mountain in Hiroshima Prefecture, and analysed, (2) Alunite sample was heated with powder of limestone to make double decomposition as K2SO4⋅Al2(SO4)3⋅4Al(OH)3+3CaCO3=K2SO4+3Al2O3+3CaSO4+6H2O+3CO2, (3) The mixed powder (K2SO4+3Al2O3+3CaSO4) obtained by the above double decomposition was mixed with (NH4)2CO3 in water solution or blowed with NH3 and CO3 gases, to make the conversion of CaSO4 to CaCO3 as K2SO4+3Al2O3+3CaSO4+6NH3+3CO2 or 3(NH4)2CO3=(K2SO4+3(NH4)2SO4)+(3Al2O3+3CaCO3), (4) The filtered mixed sulphate solution (K2SO4+3(NH4)2SO4) was evaporated to crystal, which contains about 8-10% K2O in K2SO4 and 19-22% NH3 in (NH4)2SO4, which will be used as useful fertilizer, (5) The residue (3Al2O3+3CaCO3) was dried and heated at about 1350°C, to make high alumina containing clinker, from which early high strength alumina cement can be specially obtained, (6) The yield of potash-ammonia fertilizer is about 17-19% of the original alunite, and the yield of special alumina cement is about 85-95%.
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