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

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, reactio...

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Autores principales:	Luo Biwei, Li Pengfei, Li Yan, Ji Jun, He Dongsheng, Tian Qifeng, Chen Yichang
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	phosphate rock fly ash carbothermal reduction apparent kinetics Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/79a18974a09f46cd9b81889d1033619c
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spelling	oai:doaj.org-article:79a18974a09f46cd9b81889d1033619c2021-12-05T14:10:49ZFeasibility of fly ash as fluxing agent in mid- and low-grade phosphate rock carbothermal reduction and its reaction kinetics2191-955010.1515/gps-2021-0008https://doaj.org/article/79a18974a09f46cd9b81889d1033619c2021-03-01T00:00:00Zhttps://doi.org/10.1515/gps-2021-0008https://doaj.org/toc/2191-9550The 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.Luo BiweiLi PengfeiLi YanJi JunHe DongshengTian QifengChen YichangDe Gruyterarticlephosphate rockfly ashcarbothermal reductionapparent kineticsChemistryQD1-999ENGreen Processing and Synthesis, Vol 10, Iss 1, Pp 157-168 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	phosphate rock fly ash carbothermal reduction apparent kinetics Chemistry QD1-999
spellingShingle	phosphate rock fly ash carbothermal reduction apparent kinetics Chemistry QD1-999 Luo Biwei Li Pengfei Li Yan Ji Jun He Dongsheng Tian Qifeng Chen Yichang Feasibility of fly ash as fluxing agent in mid- and low-grade phosphate rock carbothermal reduction and its reaction kinetics
description	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.
format	article
author	Luo Biwei Li Pengfei Li Yan Ji Jun He Dongsheng Tian Qifeng Chen Yichang
author_facet	Luo Biwei Li Pengfei Li Yan Ji Jun He Dongsheng Tian Qifeng Chen Yichang
author_sort	Luo Biwei
title	Feasibility of fly ash as fluxing agent in mid- and low-grade phosphate rock carbothermal reduction and its reaction kinetics
title_short	Feasibility of fly ash as fluxing agent in mid- and low-grade phosphate rock carbothermal reduction and its reaction kinetics
title_full	Feasibility of fly ash as fluxing agent in mid- and low-grade phosphate rock carbothermal reduction and its reaction kinetics
title_fullStr	Feasibility of fly ash as fluxing agent in mid- and low-grade phosphate rock carbothermal reduction and its reaction kinetics
title_full_unstemmed	Feasibility of fly ash as fluxing agent in mid- and low-grade phosphate rock carbothermal reduction and its reaction kinetics
title_sort	feasibility of fly ash as fluxing agent in mid- and low-grade phosphate rock carbothermal reduction and its reaction kinetics
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/79a18974a09f46cd9b81889d1033619c
work_keys_str_mv	AT luobiwei feasibilityofflyashasfluxingagentinmidandlowgradephosphaterockcarbothermalreductionanditsreactionkinetics AT lipengfei feasibilityofflyashasfluxingagentinmidandlowgradephosphaterockcarbothermalreductionanditsreactionkinetics AT liyan feasibilityofflyashasfluxingagentinmidandlowgradephosphaterockcarbothermalreductionanditsreactionkinetics AT jijun feasibilityofflyashasfluxingagentinmidandlowgradephosphaterockcarbothermalreductionanditsreactionkinetics AT hedongsheng feasibilityofflyashasfluxingagentinmidandlowgradephosphaterockcarbothermalreductionanditsreactionkinetics AT tianqifeng feasibilityofflyashasfluxingagentinmidandlowgradephosphaterockcarbothermalreductionanditsreactionkinetics AT chenyichang feasibilityofflyashasfluxingagentinmidandlowgradephosphaterockcarbothermalreductionanditsreactionkinetics
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Feasibility of fly ash as fluxing agent in mid- and low-grade phosphate rock carbothermal reduction and its reaction kinetics

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