摘要
采用理论与实验相结合的方法对低品位磷矿在原始开车时非定态变浓度(P2O5浓度)酸解动力学进行了研究。根据低品位磷矿反应过程中主体液相磷酸浓度逐步变化的过程,提出了新的非定态酸解动力学模型。实验研究了在323~358 K温度范围内该过程的酸解动力学行为。研究结果表明:系统的反应速率常数和磷矿的酸解率随着温度的升高而逐渐增加;该动力学过程表观活化能为71.86 kJ/mol,指前因子为6.518×106。实验结果表明所选动力学模型较好地反映了该低品位磷矿变浓度非定态酸解动力学过程,为原始开车工艺条件的优化提供了理论依据。
The digestion kinetics of low-grade phosphate ores in intital operation was investigated under the non-steady state,in which the concentration of phosphoric acid is variable.A new model equation was presented according to the concentration variation of phosphoric acid in the bulk liquid phase.The kinetic behavior of the digestion process was studied in the temperature ranges 323 ～358 K.The results showed that rate constant of reaction and the weight fraction of phosphate ores conversion increase with reacti...
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2009年第2期108-112,共5页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(20046001)
关键词
低品位磷矿
酸解
动力学
low-grade phosphate ores
digestion
kinetics
