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Thermodynamic Analysis and Testing of Phosphorus Extraction by Silicothermic Process
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Xiaoyu CHENG1, 2, Jianming PANG2, Shiwen LI1, 2, Zhimin ZHAO2, Fei LIU2
Mining and Metallurgical Engineering | 2023, 43(6) : 112 - 115
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Mining and Metallurgical Engineering | 2023, 43(6): 112-115
• METALLURGY •
Thermodynamic Analysis and Testing of Phosphorus Extraction by Silicothermic Process
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Xiaoyu CHENG1, 2, Jianming PANG2, Shiwen LI1, 2, Zhimin ZHAO2, Fei LIU2
Affiliations
  • 1.Central Iron and Steel Research Institute, Beijing 100081, China
  • 2.Resource Application and Alloy Materials Division, China Iron and Research Institute Group, Beijing 100081, China
Published: 2023-12-01 doi: 10.3969/j.issn.0253-6099.2023.06.0024
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A silicothermic process was adopted to extract phosphorus, and the main chemical reactions and Gibbs free energy were clarified by thermodynamic calculation. The feasibility of the process was then verified by performing practical experiments. The main reaction of silicothermic process for phosphorus extraction is as follows: 2 (3CaO·P2O5)+5Si+SiO2 ==== 2P2(g)+6CaO·SiO2. The vacuum degree can promote the reaction to proceed in the forward direction, and a reaction system with lower pressure can lead to smaller standard Gibbs free energy of the reaction, leading to silicothermic reduction reaction occuring much easier. Increasing temperature can promote the reaction to proceed in the forward direction, and prolonging reduction time properly at the same temperature can improve the reduction rate of the reaction. After a reaction at 1 250 ℃ for 2.5 h under normal pressure, rough phosphorus (yellow phosphorus) with purity of 95.03% can be obtained by adopting silicothermic process, and the content of residual phosphorus in the dry slag is 1.45%. It is shown that using siliceous reductant in the silicothermic process for preparing yellow phosphorus can avoid the usage of coke, which conforms to low-carbon development strategy.

phosphorus chemical industry  /  yellow phosphorus  /  silicothermic process  /  thermodynamic calculation  /  reduction rate  /  industrial silicon
Xiaoyu CHENG, Jianming PANG, Shiwen LI, Zhimin ZHAO, Fei LIU. Thermodynamic Analysis and Testing of Phosphorus Extraction by Silicothermic Process[J]. Mining and Metallurgical Engineering, 2023 , 43 (6) : 112 -115 . DOI: 10.3969/j.issn.0253-6099.2023.06.0024
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Year 2023 volume 43 Issue 6
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doi: 10.3969/j.issn.0253-6099.2023.06.0024
  • Receive Date：2023-06-07
  • Online Date：2026-03-05
  • Published：2023-12-01
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  • Received：2023-06-07
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    1.Central Iron and Steel Research Institute, Beijing 100081, China
    2.Resource Application and Alloy Materials Division, China Iron and Research Institute Group, Beijing 100081, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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