In order to explore an efficient and clean conversion way of Ningdong coal, the chemical-looping reaction of Ningdong coal was conducted in a laboratory-scale fluidized-bed reactor using manganese ore as the oxygen carrier (OC), and the reaction characteristics were investigated in combination by thermogravimetric analysis. Experiments included the investigation of the reaction of the manganese ore with 5 vol % H and with coal powder at 900 °C, the catalytic and OC effect of manganese ore on coal gasification, the reaction efficiency and reaction products under different mass ratios of OC to coal (O/C), and the effect of multiple cycles on the reaction performance of the manganese ore. At 900 °C, the OC exhibited higher reactivity with coal syngas, significantly reducing the time of coal gasification (∼48% reduction). The manganese ore itself contained alkali metals, exhibiting a certain capacity for sulfur fixation, but the sulfur fixation was gradually weakened during multicycle experiments. The manganese ore did not exhibit any inhibition effect on NO emission. From the wear rate of the manganese ore during fluidized reaction, its service life could be deduced to be about 150 h. Hence, it is necessary to improve the strength of the manganese ore OC.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7594128 | PMC |
| http://dx.doi.org/10.1021/acsomega.0c03464 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Selection and optimization of biofilm carriers as high-effective microbial separator in microbial fuel cells.
Bioresour Technol
December 2024
School of Environment, Nanjing Normal University, Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Nanjing 210023, China. Electronic address:
Four biofilm carriers including pyrite, manganese ore, ceramsite, and polyurethane sponge were used to construct microbial separators (MSs), while their performance in dual-chamber microbial fuel cells (MFCs) was evaluated. Polyurethane sponge and pyrite were superior biofilm carriers for MSs. The dense biofilm on the polyurethane sponge provides MS with optimal barrier capacity against dissolved oxygen and chemical oxygen demand.
View Article and Find Full Text PDFSimultaneous removal of ammonia, copper ions and sulfamethoxazole from aquaculture wastewater with low carbon to nitrogen ratio enhanced by manganese redox driven by a two-stage synergistic bioreactor: Optimization and potential mechanism.
J Hazard Mater
November 2024
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
The problem of low carbon-nitrogen ratio (C/N) in wastewater is a major challenge for biological treatment, especially the complex pollution of ammonia nitrogen (NH-N), sulfamethoxazole (SMX), and copper ions (Cu(II)). Herein, a strain of Pseudoxanthomonas sp. MA23 with manganese (Mn) reduction-coupled ammonia oxidation properties was isolated.
View Article and Find Full Text PDFSimultaneous removal of vanadium and nitrogen in two-stage vertical flow constructed wetlands: Performance and mechanisms.
Chemosphere
November 2024
State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, PR China. Electronic address:
Vanadium (V(V)) and nitrate, as co-concomitant pollutants in water bodies, pose potential threats to the eco-environment and human health. This study was to reveal the feasibility of simultaneous removal of V(V) and nitrate in the series-wound vertical flow constructed wetlands (CWs) with iron ore (B-CWs)/manganese ore (C-CWs)-wood substrates. The results showed that B-CWs could achieve efficient V(V) and NO-N removal with the influent of 2 and 10 mg/L (V(V)/NO-N = 1:5), respectively.
View Article and Find Full Text PDFIron separation from iron-rich manganese ore leachate: Comprehensive optimization of operating parameters and economic viability.
Chemosphere
November 2024
Daxin Manganese Mining Branch of South Manganese Group Limited, Chongzuo, 532315, China. Electronic address:
In the current electrolytic manganese industry, iron separation and reuse from iron-rich manganese ore leachate (IRMOL) has become one of the most pressing challenges. This study aimed to investigate the optimal conditions for iron separation from IRMOL and to assess the economic and practical advantages of iron separation or removal in industrial manufacturing. To identify more cost-effective and technologically advanced production circumstances, we examined five key elements that weaken Fe(OH) colloidal production conditions in enterprises: reaction temperature, pH, crystal species, aging and reaction time.
View Article and Find Full Text PDFManganese(III) dominants the mobilization of phosphorus in reducing sediments: Evidence from Aha reservoir, Southwest China.
Sci Total Environ
December 2024
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100049, China; Guizhou Province Field Scientific Observation and Research Station of Hongfeng Lake Reservoir Ecosystem, Guiyang 551499, China. Electronic address:
Eutrophication has become one of the greatest threats to aquatic ecosystems. The release of phosphorus (P) from sediments exerts a critical role on eutrophication level. Both manganese (Mn) and iron (Fe), sensitive to redox conditions, own strong affinity for P.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!