Selecting and Testing of Cement-Bonded Magnetite and Chalcopyrite as Oxygen Carrier for Chemical-Looping Combustion
Journal article, 2022

Combining iron and copper ores can generate an oxygen carrier that has a synergic effect of high temperature resistance and high reactivity. In this work, typical cements available in the market were studied as binders to bind magnetite and chalcopyrite to develop a suitable oxygen carrier for chemical-looping combustion (CLC). A first selection step suggested that an aluminate cement, namely CA70, could favor the generation of oxygen carrier particles having good crushing strength, good particle yield, and high reactivity. The CA70-bonded oxygen carrier was then subjected to cyclic tests with CH4, CO, and H-2 in reduction and in air oxidation at temperatures of 850, 900, and 950 degrees C with gas concentrations of 5, 10, 15, and 20% in a batch-fluidized bed reactor. The increase in temperature promoted the fuel conversion. At 950 degrees C, the conversions of CH4 and CO reached up to 80.4% and 99.2%, respectively. During more than 30 cycles, the oxygen carrier kept a similar reactivity to the fresh carrier and maintained its composition and physical properties. The oxygen transport capacity was maintained at 21-23%, and the phases were CuO, Fe2O3, Al2O3, and minor CaS. In the used sample, some grains were observed, but the morphology was not greatly changed. Agglomeration was absent during all the cycles, except for the deep reduction with H-2.

iron ore

chemical-looping combustion

oxygen carrier

copper ore

cement binder

Author

Mengjun Li

Huazhong Agricultural University

Teng Zheng

Huazhong Agricultural University

Daofeng Mei

Chalmers, Space, Earth and Environment, Energy Technology

Baowen Wang

North China University of Water Resources & Electric Power

Jingjing Ma

Ningxia University

Energies

1996-1073 (ISSN) 19961073 (eISSN)

Vol. 15 14 5093

Subject Categories

Ceramics

Materials Chemistry

Other Chemical Engineering

DOI

10.3390/en15145093

More information

Latest update

8/18/2022