Recovery of CaO by Reductive Decomposition of Spent Gypsum in a CO−CO2−N2Atmosphere

2003 ◽  
Vol 42 (24) ◽  
pp. 6046-6052 ◽  
Author(s):  
Satoshi Okumura ◽  
Naoto Mihara ◽  
Ken Kamiya ◽  
Shoji Ozawa ◽  
Maurice S. Onyango ◽  
...  
Keyword(s):  
Reductive Decomposition

Zu den Phasenbeziehungen im System V/Nb/O, IV. Die Festelektrolyt-Coulometrie (FEC) als Methode zur Aufklärung ternärer Zustandsgebiete am Beispiel des Systems V/Nb/O/The Phase Relations in the System V/Nb/O, IV. Solid Electrolytic Coulometry (SEC) as a Method to Investigate Ternary Systems: V/Nb/O

1999 ◽  
Vol 54 (1) ◽  
pp. 123-130 ◽  
Author(s):  
L. Kirsten ◽  
F. von Woedtke ◽  
H. Oppermann
Keyword(s):  
Ternary Systems ◽  
Phase Relations ◽  
Current Time ◽  
Reductive Decomposition ◽  
Magnéli Phases

The observation of reductive decomposition with SEC-current-time-temperature curves on the binary line V2O5-Nb2O5 is a useful method to determine qualitatively and quantitatively (“quasi in situ”) the known ternary coexistence regions. By reduction of VO2 the Magneli-Phases VnO2n-1 are generated. The method is generally applicable and allows rapid information by reductive decompositon or oxidative formation in coexistence regions.The conditions of decomposition can be optimized for a given system. Slow solid-gas equilibria are not detectable by this method.

Reductive decomposition: A basis for the universal technique of analyzing rocks for noble metals content

2021 ◽  
pp. 93-102
Author(s):  
Galina Andreevna Oleynikova ◽  
Yuriy Nikolaevich Borin ◽  
Valeriy Leonidovich Kudryashov ◽  
Vladimir Anatol'evich Shishlov ◽  
Sergey Semenovich Shevchenko ◽  
...  
Keyword(s):  
Noble Metals ◽  
Reductive Decomposition

Synergistic impact of humic acid on the photo-reductive decomposition of perfluorooctanoic acid

2019 ◽  
Vol 360 ◽  
pp. 1101-1110 ◽  
Author(s):  
Chenxi Guo ◽  
Chaojie Zhang ◽  
Zhuyu Sun ◽  
Xiaoyun Zhao ◽  
Qi Zhou ◽  
...  
Keyword(s):  
Humic Acid ◽  
Perfluorooctanoic Acid ◽  
Reductive Decomposition

Reductive decomposition of calcium sulfate utilizing carbon monoxide and hydrogen

1985 ◽  
Vol 40 (3) ◽  
pp. 319-324 ◽  
Author(s):  
Luis M. Diaz-Bossio ◽  
Steven E. Squier ◽  
Allen H. Pulsifer
Keyword(s):  
Carbon Monoxide ◽  
Calcium Sulfate ◽  
Reductive Decomposition

Sub-micrometric and nanometric solid phases obtained through reductive decomposition reaction of β-cyclodextrin / Β-siklodekstrin indirgeyici bozunma reaksiyonu yoluyla elde edilen alt mikrometrik ve nanometrik katı fazlar

2015 ◽  
Vol 40 (5) ◽  
Author(s):  
Kate Cristina Blanco ◽  
Francisco José dos Santos ◽  
Miguel Jafelicci Júnior ◽  
Mary Helen Palmuti Braga Vettori ◽  
Sandra Mara Martins Franchetti ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Chemical Reactions ◽  
Convenient Method ◽  
Solid Phase ◽  
Low Cost ◽  
Decomposition Reaction ◽  
Reductive Decomposition ◽  
Industrial Use ◽  
Solid Phases

AbstractObjective: Cyclodextrins have been used to catalyze chemical reactions in the synthesis of different materials. The aim of this study is to produce nanoparticles using cyclodextrin as a nanoreactor.Methods: In this study, nanoparticles from the solid phase of iron oxide (FeResults: The images demonstrated that the nanoparticles exhibited a polyhedric shape with a diameter of 100 nm for FeConclusion: Based on this characterization, the proposed technique proved to be an efficient, low-cost, convenient method for the production of sub-micrometric and nanometric solid phases and can likely be scaled up for industrial use. The results demonstrate the possibility of producing nanoparticles using cyclodextrin as a nanoreactor.

Effects of Additives on the Reductive Decomposition of Phosphogypsum in the CO Atmosphere

2013 ◽  
Vol 726-731 ◽  
pp. 331-339
Author(s):  
Long Gui Xie ◽  
Li Ping Ma ◽  
Qu Xiu Dai ◽  
Yu Mao ◽  
Hang Zhang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Decomposition Rate ◽  
Decomposition Reaction ◽  
Decomposition Temperature ◽  
Reductive Decomposition ◽  
Reducing Atmosphere ◽  
The One

The effect of the reaction time and the amount of additives on the decomposition rate and temperature of phosphogypsum were studied in the weak reducing atmosphere of 3%Vol CO by using themixture of phosphogyp-sum and a certain percentage of CaCl2, Fe2O3and MgO additives. The resultshows that the decomposition rate of phosphogypsum reached 85% by adding CaCl2and Fe2O3, and the decomposition temperature of phosphogypsum was only 950°C which was 100 °C lower than the one of decomposition reaction of phosphogypsum without any adductives. And the addition of MgO had nosignificant effects on the decomposition of phosphogypsum under the same condition.

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