Thermodynamics Analysis on Monazite Decomposition with Sodium Hydroxide AITranslate
Abstract AITranslate
Thermodynamics of monazite decomposition with sodium hydroxide was studied by taking LaPO4 as a representative.According to the known thermodynamic data,lgc-pH diagrams of La-P-H2O system were established at 25 ℃.The technical conditions of monazite decomposition with sodium hydroxide were analyzed based on these diagrams.According to the calculation results,at the range of 2.77〈pH〈13.73,the concentrations of total lanthanum and total phosphorus are extremely low and even lower than the theoretical limit concentration of LaPO4 in aqueous solution,so the pH range can be considered as the stable region for LaPO4 precipitates.At the range of pH〈2.77,the concentration of La^3＋ increases rapidly with decreasing pH value,which is the process of acid decomposition of LaPO4 precipitates.When the pH value is higher than 14.1,LaPO4 precipitates can be resolved into La（OH）3（aq）,La（OH）^4-,La（OH）3（s）and PO4^3-,and it is the process of the alkaline decomposition of LaPO4 precipitates.According to the solution equilibrium characteristics of each component in the solution,industrial practice and the experimental results,it can be concluded that monazite can theoretically be completely decomposed as long as the concentration of sodium hydroxide is high enough.
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Chinese Library Classification Number:TF845.6[冶金工程—有色金属冶金]
Citation Information:
Thermodynamics of monazite decomposition with sodium hydroxide was studied by taking LaPO4 as a representative.According to the known thermodynamic data,lgc-pH diagrams of La-P-H2O system were established at 25 ℃.The technical conditions of monazite decomposition with sodium hydroxide were analyzed based on these diagrams.According to the calculation results,at the range of 2.77〈pH〈13.73,the concentrations of total lanthanum and total phosphorus are extremely low and even lower than the theoretical limit concentration of LaPO4 in aqueous solution,so the pH range can be considered as the stable region for LaPO4 precipitates.At the range of pH〈2.77,the concentration of La^3＋ increases rapidly with decreasing pH value,which is the process of acid decomposition of LaPO4 precipitates.When the pH value is higher than 14.1,LaPO4 precipitates can be resolved into La（OH）3（aq）,La（OH）^4-,La（OH）3（s）and PO4^3-,and it is the process of the alkaline decomposition of LaPO4 precipitates.According to the solution equilibrium characteristics of each component in the solution,industrial practice and the experimental results,it can be concluded that monazite can theoretically be completely decomposed as long as the concentration of sodium hydroxide is high enough.
quote
| GB/T 7714-2015 | [1] YANG Zhen, HE Li-hua, GUO Fu-liang. Thermodynamics Analysis on Monazite Decomposition with Sodium Hydroxide[J]. Rare Metals and Cemented Carbides, 2016(6): 13-17. |
| MLA | [1] YANG Zhen, et al., "Thermodynamics Analysis on Monazite Decomposition with Sodium Hydroxide." Rare Metals and Cemented Carbides, no. 6, 2016, pp. 13-17. |
| APA | [1] YANG Zhen, HE Li-hua, & GUO Fu-liang. (2016). Thermodynamics Analysis on Monazite Decomposition with Sodium Hydroxide. Rare Metals and Cemented Carbides(6), 13-17. |
| IEEE | [1] YANG Zhen, HE Li-hua, and GUO Fu-liang, "Thermodynamics Analysis on Monazite Decomposition with Sodium Hydroxide," Rare Metals and Cemented Carbides, no. 6, pp. 13-17, 2016. keywords: {monazite;sodium hydroxide;La-P-H2O system;LaPO4;thermodynamics;lgc-pH equilibrium diagram} |