caa a22 4500 463171276 CHVBK 20180406164814.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10163-006-0167-4 doi (NATIONALLICENCE)springer-10.1007/s10163-006-0167-4 Reductive decomposition of waste gypsum with SiO2, Al2O3, and Fe2O3 additives [Elektronische Daten] [Naoto Mihara, Dalibor Kuchar, Yoshihiro Kojima, Hitoki Matsuda] From the point of view of a sustainable and environment-friendly society based on the recycling of material resources, it is preferable to utilize waste gypsum as a substitute for lime, which is currently produced by the calcination of limestone. In the present work, the reductive decomposition of CaSO4 was investigated under an atmosphere of CO: 2 vol%, CO2: 30 vol%, with N2 as a carrier gas without and with the addition of SiO2, Al2O3, or Fe2O3. It was found that the decomposition temperature of CaSO4 was significantly reduced from 1673 K to 1223 K when only 5 wt% Fe2O3 was added to CaSO4. In the case of the addition of SiO2 or Al2O3 to CaSO4, the decomposition temperature was reduced from 1673 K to 1623 K. This was due to the formation of composite oxides (calcium ferrite, calcium silicate, or calcium aluminate) during the reaction of CaSO4 with the additives at a lower temperature. In addition, the formation of unfavorable product CaS was inhibited in the presence of 5 wt% Fe2O3, and this inhibition effect further increased as the addition of Fe2O3 was increased. In contrast, no significant effect on the inhibition of CaS formation was observed on the addition of SiO2 or Al2O3. Springer-Verlag Tokyo, 2007 Waste gypsum nationallicence Reductive decomposition nationallicence Iron oxide nationallicence Silica nationallicence Alumina nationallicence Mihara Naoto Department of Energy Engineering and Science, Nagoya University, 1 Furo-cho, Chikusa-ku, 464-8603, Nagoya, Japan aut Kuchar Dalibor Department of Chemical Engineering, Nagoya University, Nagoya, Japan aut Kojima Yoshihiro EcoTopia Science Institute, Nagoya University, Nagoya, Japan aut Matsuda Hitoki Department of Energy Engineering and Science, Nagoya University, 1 Furo-cho, Chikusa-ku, 464-8603, Nagoya, Japan aut Journal of Material Cycles and Waste Management Springer-Verlag 9/1(2007-03-01), 21-26 1438-4957 9:1<21 2007 9 10163 https://doi.org/10.1007/s10163-006-0167-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10163-006-0167-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mihara Naoto Department of Energy Engineering and Science, Nagoya University, 1 Furo-cho, Chikusa-ku, 464-8603, Nagoya, Japan aut NATIONALLICENCE 700 1- Kuchar Dalibor Department of Chemical Engineering, Nagoya University, Nagoya, Japan aut NATIONALLICENCE 700 1- Kojima Yoshihiro EcoTopia Science Institute, Nagoya University, Nagoya, Japan aut NATIONALLICENCE 700 1- Matsuda Hitoki Department of Energy Engineering and Science, Nagoya University, 1 Furo-cho, Chikusa-ku, 464-8603, Nagoya, Japan aut NATIONALLICENCE 773 0- Journal of Material Cycles and Waste Management Springer-Verlag 9/1(2007-03-01), 21-26 1438-4957 9:1<21 2007 9 10163 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer