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47 results on '"Zeng, Ya‐Nan"'

20. Metallurgical slag used for efficient growth of Chlorella pyrenoidosa to achieve CO2 conversion to biodiesel.

Author

Guo, Hua‐Wei, Wang, Ya‐Jun, Liu, Huan, Zeng, Ya‐Nan, Wang, Wei‐Jie, Liu, Tian‐Ji, Kang, Le‐Le, Ji, Rui, Wang, Yi‐Tong, Li, Jun‐Guo, and Fang, Zhen

Subjects
CHLORELLA pyrenoidosa, CARBON sequestration, CARBON fixation, CARBON offsetting, STEEL wastes, METALLURGICAL analysis, SLAG, CHLORELLA vulgaris, CHLORELLA
Abstract

Metallurgical slag such as solid waste generated in the steel industry carries environmental pollution risks, but it is rich in nutrients required by microalgae. Metallurgical slag used for carbon capture and biomass energy conversion has multiple benefits: (i) reduction and harmless treatment of metallurgical solid waste, (ii) assisting in carbon neutrality by efficient carbon fixation, and (iii) production of biodiesel from CO2. In this study, AOD, BOF, BFS, HVS, and VTS slag were applied to culture Chlorella pyrenoidosa (C. pyrenoidosa) with the regulation of growth, carbon fixation, and lipid synthesis. An excellent fixed amount of CO2 with 94.59 mg is obtained from C. pyrenoidosa biomass at BOF slag added (mass ratio of CO2 captured/microalgae/slag with 1.99/1.00/10.53) since high Ca/Mg mass ratio of 419 (8.38 mg/L Ca and 0.02 mg/L Mg), no Cr and low concentration of Al (0.04 mg/L) contribute to regulating antioxidant enzyme activity (SOD and POD) to resist ROS and improving PEPC activity to reduce carbon flux toward lipid to promote biomass synthesis. Both metal concentrations from Ca (5.86 mg/L), Mg (0.05 mg/L), Al (0.42 mg/L), and Cr (0.006 mg/L) and suitable pH (10.53) in AOD leaching solution at solid/liquid ratio of 0.5 g/L change carbon flow toward efficient lipid synthesis (47.07 wt%) by continuously providing raw materials and energy by regulating ACC, ME, and PEPC activities. High value‐added biodiesel with high concentrations of C16 and C18 methyl esters from lipid of C. pyrenoidosa is achieved, following other ecological and economic benefits including 197 mg CO2 captured and 2198 mg AOD applied with harmless. In this study, C. pyrenoidosa is cultured with elements from metallurgical slag solid waste, which promotes C. pyrenoidosa efficient carbon fixation to assist in carbon neutrality, and provides guidance for CO2 conversion to high‐value‐added products with low cost. [ABSTRACT FROM AUTHOR]

Published
2024
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25. Highly stable NaFeO2-Fe3O4 composite catalyst from blast furnace dust for efficient production of biodiesel at low temperature

Author

Wang, Xiao-Man, primary, Zeng, Ya-Nan, additional, Jiang, Li-Qun, additional, Wang, Yi-Tong, additional, Li, Jun-Guo, additional, Kang, Le-Le, additional, Ji, Rui, additional, Gao, Di, additional, Wang, Fu-Ping, additional, Yu, Qing, additional, Wang, Ya-Jun, additional, Ji, Ai-Min, additional, and Fang, Zhen, additional

Published
2022
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31. Direct production of biodiesel via simultaneous esterification and transesterification of renewable oils using calcined blast furnace dust

Author

Wang, Yi-Tong, Cong, Wen-Jie, Zeng, Ya-Nan, Zhang, Yu-Qing, Liang, Jing-Long, Li, Jun-Guo, Jiang, Li-Qun, Fang, Zhen, Wang, Yi-Tong, Cong, Wen-Jie, Zeng, Ya-Nan, Zhang, Yu-Qing, Liang, Jing-Long, Li, Jun-Guo, Jiang, Li-Qun, and Fang, Zhen

Abstract

Direct production of biodiesel by both esterification and transesterification of renewable oils with acid value (AV) of 9.6-28.9 mg KOH/g using calcined blast furnace dust is studied. Blast furnace dust calcined at 600-700 degrees C obviously promotes efficient biodiesel production because of the crystal form transformation from lead sulfate particles in dust into active lead oxide, lead sulfide, and lead particles. It is found for the first time that lead oxide, lead sulfide and lead particles can resist saponification from fatty acids to catalyze raw renewable oils to biodiesel with catalytic activity order as follows: lead oxide > lead > lead sulfide > lead sulfate. Biodiesel production process is optimized according to an orthogonal design with biodiesel yield of 92 wt% obtained at AV of 9.6 mg KOH/g (82 wt% after 5 cycles). Biodiesel yield of 84 wt% is achieved at AV of 28.9 mg KOH/g with acidity of 0.18 mmol/g. Calcined blast furnace dust presents potential applications in the production of biodiesel from renewable oils with high AVs., QC 20210720

Published
2021
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47. Failure mode and hot ductility of Ti-bearing steel in the brittle zone

Author

Zeng, Ya-Nan, Sun, Yan-Hui, Cai, Kai-Ke, Ma, Zhi-Fei, Xi-Ai, Zeng, Ya-Nan, Sun, Yan-Hui, Cai, Kai-Ke, Ma, Zhi-Fei, and Xi-Ai

Abstract

The hot ductility of Ti-bearing steel was studied by theoretical calculation and a thermal simulation experiment. Meanwhile, microsegregation and precipitates were analyzed. The results showed that the S, P and O elements were enriched at the grain boundaries, while the hot ductility was deteriorated by inclusions of (Fe, Mn, Si, Al)(S,O) in the interdendritic region. At a temperature of 1300 °C, large TiN particles have little effect on the hot ductility. In the temperature range from 1000 °C to 900 °C, the Reduction of Area (R.A) declined rapidly from 81.77% to 31.77%, with the size of particles decreasing from 5 to 20 nm and quantity increasing from 1.2 inds/μm2to 354 inds/μm2, respectively. In the temperature range from 900 °C to 850 °C, R.Adecreased from 31.77% to 30.12% with the ferric films gradually thickening. The critical stress, 63.58 MPa, was equal to tensile strength at 912 °C. Intergranular fracture occurred easily with higher critical stress below 912 °C.

Published
2013
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