SiC-Al2O3 powder synthesized by microwave heating carbothermal reduction of fly ash

2011 ◽  
Author(s):  
Zhang Lei ◽  
Luo Zhongtao ◽  
Wang Xue-Ping ◽  
Yang Jiu-Jun
Keyword(s):  
Fly Ash ◽  
Microwave Heating ◽  
Carbothermal Reduction

scholarly journals Feasibility of fly ash as fluxing agent in mid- and low-grade phosphate rock carbothermal reduction and its reaction kinetics

2021 ◽  
Vol 10 (1) ◽  
pp. 157-168
Author(s):  
Biwei Luo ◽  
Pengfei Li ◽  
Yan Li ◽  
Jun Ji ◽  
Dongsheng He ◽  
...  
Keyword(s):  
Particle Size ◽  
Fly Ash ◽  
Reaction Time ◽  
Carbothermal Reduction ◽  
Industrial Waste ◽  
Phosphate Rock ◽  
Molar Ratio ◽  
Low Grade ◽  
Carbon Excess ◽  
Fluxing Agent

Abstract The feasibility of industrial waste fly ash as an alternative fluxing agent for silica in carbothermal reduction of medium-low-grade phosphate ore was studied in this paper. With a series of single-factor experiments, the reduction rate of phosphate rock under different reaction temperature, reaction time, particle size, carbon excess coefficient, and silicon–calcium molar ratio was investigated with silica and fly ash as fluxing agents. Higher reduction rates were obtained with fly ash fluxing instead of silica. The optimal conditions were derived as: reaction temperature 1,300°C, reaction time 75 min, particle size 48–75 µm, carbon excess coefficient 1.2, and silicon–calcium molar ratio 1.2. The optimized process condition was verified with other two different phosphate rocks and it was proved universally. The apparent kinetics analyses demonstrated that the activation energy of fly ash fluxing is reduced by 31.57 kJ/mol as compared with that of silica. The mechanism of better fluxing effect by fly ash may be ascribed to the fact that the products formed within fly ash increase the amount of liquid phase in the reaction system and promote reduction reaction. Preliminary feasibility about the recycling of industrial waste fly ash in thermal phosphoric acid industry was elucidated in the paper.

Phase transformation of high aluminium fly ash in carbothermal reduction–nitridation at high temperatures

2014 ◽  
Vol 32 (4) ◽  
pp. 399-403
Author(s):  
M. H. Fang ◽  
H. T. Liu ◽  
Z. H. Huang ◽  
J. T. Huang ◽  
Y. G. Liu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Fly Ash ◽  
High Temperatures ◽  
Carbothermal Reduction ◽  
High Aluminium

Phillipsite synthesis from fly ash prepared by hydrothermal treatment with microwave heating

2006 ◽  
Vol 17 (4) ◽  
pp. 369-382 ◽  
Author(s):  
Kunihiro Fukui ◽  
Kazuhiro Arai ◽  
Keiji Kanayama ◽  
Hideto Yoshida
Keyword(s):  
Fly Ash ◽  
Microwave Heating ◽  
Hydrothermal Treatment

scholarly journals Mechanism for the formation of SiC by carbothermal reduction reaction using a microwave heating technique

2011 ◽  
Vol 119 (1394) ◽  
pp. 740-744 ◽  
Author(s):  
Shinobu HASHIMOTO ◽  
Syuho OHASHI ◽  
Kiyoshi HIRAO ◽  
You ZHOU ◽  
Hideki HYUGA ◽  
...  
Keyword(s):  
Microwave Heating ◽  
Carbothermal Reduction ◽  
Reduction Reaction ◽  
Carbothermal Reduction Reaction

Fabrication of Porous SiC/SiAlON Composites Using Semi Coke and Fly Ash as Raw Material

2012 ◽  
Vol 724 ◽  
pp. 347-350 ◽  
Author(s):  
Qing Wen Duan ◽  
Rong Zhen Liu ◽  
Hai Yun Jin ◽  
Jian Feng Yang ◽  
Zhi Hao Jin
Keyword(s):  
Fly Ash ◽  
Carbothermal Reduction ◽  
Pore Diameter ◽  
Reduction Method ◽  
Raw Materials ◽  
Nitrogen Atmosphere ◽  
Raw Material ◽  
Coke Content ◽  
Porous Sic ◽  
Median Pore

Porous SiC/SiAlON ceramics were fabricated by carbothermal reduction method from raw materials of fly ash and semi coke in nitrogen atmosphere. The results showed that composites were composed by multi-structure of SiC, Ca-SiAlON and AlN phases. With the increase of semi coke contents, the contents of Ca-Sialon increased. The fracture mode of this material was intergranular. The results also showed that micro area hereditary of semi coke particles was observed in the morphology of this material. The morphology of this material was composed by nanosized SiC and plate like Ca-SiAlON. The median pore diameter was affected by the contents of semi coke and increased with the increase of semi coke content.

A Review on Preparation of Non-Oxides Materials from Fly Ash

2012 ◽  
Vol 531 ◽  
pp. 280-283
Author(s):  
Bei Yue Ma ◽  
Bo Li ◽  
Yu Shi Ding ◽  
Chen Yan ◽  
Ying Li ◽  
...  
Keyword(s):  
Fly Ash ◽  
Carbothermal Reduction ◽  
Reduction Process

The latest development on preparation of SiC-AlN, SiC-mullite and β-Sialon materials using fly ash via in-situ carbothermal reduction process was reviewed. The synthesis mechanisms of SiC based materials and β-Sialon were also discussed.

Preparation of β-Sialon from Fly Ash by Carbothermal Reduction-Nitridation Reaction

2008 ◽  
Vol 368-372 ◽  
pp. 910-912 ◽  
Author(s):  
Jun Tong Huang ◽  
Ming Hao Fang ◽  
Yan Gai Liu ◽  
Zhao Hui Huang
Keyword(s):  
Fly Ash ◽  
Carbon Black ◽  
Carbon Content ◽  
Carbothermal Reduction ◽  
Single Phase ◽  
Raw Materials ◽  
Synthesis Mechanism ◽  
Nitridation Reaction

Single phase Sialon was synthesized successfully from fly ash by carbothermal reductionnitridation reaction in this paper. The effects of synthesizing temperature (1200°C, 1300°C, 1400°C and 1450°C) and carbon content (stoichiometric content, exceeding 10%, 50% and 100%) on the final production were studied by XRD and SEM. Synthesis mechanism of β-Sialon was also analysized. The results indicated that single phase β-Sialon with z=3 was obtained using fly ash as raw materials and carbon black of stoichiometric content as reducer by carbothermal reduction- nitridation reaction in flow nitrogen at 1450°C for 3h. Temperature and content of carbon had significant effect on the synthesis of β-Sialon.

Thermodynamics and kinetics of carbothermal reduction of zinc ferrite by microwave heating

2013 ◽  
Vol 23 (12) ◽  
pp. 3808-3815 ◽  
Author(s):  
Xin WANG ◽  
Da-jin YANG ◽  
Shao-hua JU ◽  
Jin-hui PENG ◽  
Xin-hui DUAN
Keyword(s):  
Microwave Heating ◽  
Carbothermal Reduction ◽  
Zinc Ferrite ◽  
Thermodynamics And Kinetics ◽  
Kinetics Of
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