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首页> 外文期刊>Metallurgical Research & Technology >Stability analysis of hydroxyapatite in the system P-Ca-H2O aided prediction of the mechanisms of dephosphorization from the high phosphorus iron ore by hydrometallurgy process
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Stability analysis of hydroxyapatite in the system P-Ca-H2O aided prediction of the mechanisms of dephosphorization from the high phosphorus iron ore by hydrometallurgy process

机译：P-Ca-H2O系统中羟基磷灰石的稳定性分析有助于预测高磷铁矿湿法脱磷的机理

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摘要

Stability of hydroxyapatite (HA) in the system P-Ca-H2O at room temperature (298 K) and elevated temperature (363 K) were analyzed in terms of log [P]-pH diagrams to discuss the mechanisms of phosphorus removal from high phosphorus iron ore. The effects of system pH value and temperature on the concentrations of species in the P-Ca-H2O system were elaborated according to thermodynamic calculation. Lower temperature contributes to improve the dissolution of HA and this effect is more obvious at pH values lower than 11.3. At higher pH values, it is easy to remove phosphorus from iron ores at elevated temperature, attributing to the predominance area of highly soluble PO43- and HPO42- expansion. On the basis of these thermodynamic analyses, a suitable dephosphorization method of acid leaching at room temperature was proposed for high phosphorus iron ore.
机译：根据log [P] -pH图分析了P-Ca-H2O体系中羟基磷灰石（HA）在室温（298 K）和高温（363 K）下的稳定性，讨论了高磷脱磷的机理铁矿。通过热力学计算，详细阐述了系统pH值和温度对P-Ca-H2O系统中物种浓度的影响。较低的温度有助于改善HA的溶解，在pH值低于11.3时，这种作用更为明显。在较高的pH值下，在高温下很容易从铁矿石中除去磷，这归因于高度溶解的PO43-和HPO42-膨胀的主要区域。在这些热力学分析的基础上，提出了一种适用于高磷铁矿石室温浸出酸脱磷的合适方法。

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