Research on sulphur conversion and acid balance from marmatite in pressure acid leaching

被引:6
作者
Tian, L. [1 ]
Liu, Y. [1 ]
Lv, G. Z. [1 ]
Yu, X. [1 ]
Zhou, S. [1 ]
Zhang, T. A. [1 ]
机构
[1] Northeastern Univ, Lab Ecol Utilizat Multimetall Mineral, Minist Educ, Shenyang 110819, Liaoning, Peoples R China
基金
中国国家自然科学基金;
关键词
Oxygen pressure acid leaching; Kinetics; Sulphur conversion; Acid balance; Activation energy; Orthogonal experiment; SPHALERITE;
D O I
10.1080/00084433.2016.1210274
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
In this paper, the kinetics of oxygen pressure acid leaching of marmatite was studied in the low-temperature region (383-413K). The effects of agitation rate, particle size, temperature, H2SO4 concentration and oxygen partial pressure on the conversion of sulphur ((S2-S0)) were investigated. The results showed that the conversion ratio increased with increasing agitation rate, temperature and oxygen partial pressure, and with decreasing particle size and H2SO4 concentration. Moreover, the results demonstrated that sulphur conversion was controlled by an interfacial chemical reaction, with an apparent activation energy of 51.17kJmol(-1). The calculated reaction orders of sulphuric acid and oxygen were 0.48 and 1.01, respectively. The leaching reaction followed an unreacted shrinking core model. A model kinetic equation was established for sulphur conversion. Orthogonal experiments regarding the acid balance of the oxygen pressure leaching residue were carried out. Variance analysis showed that temperature had the largest influence on this, so the effect of the temperature region (383-443K) on acid balance was further investigated. When the temperature exceeded 443K, the increase in the sulphur oxidation ratio was too large, which tended to increase the acidity of the system. Dans cet article, on a etudie la cinetique du lessivage a l'acide sous pression d'oxygene de la marmatite, dans la region a basse temperature (383-413K). On a examine l'effet de la vitesse d'agitation, de la taille de particule, de la temperature, de la concentration en H2SO4 et de la pression partielle de l'oxygene, sur la conversion du soufre ((S2-S0)). Les resultats ont montre que le rapport de conversion augmentait avec l'augmentation de la vitesse d'agitation, de la temperature et de la pression partielle d'oxygene, et avec une diminution de la taille de particule et de la concentration en H2SO4. De plus, les resultats ont demontre que la conversion du soufre etait controlee par une reaction chimique a l'interface, avec une energie d'activation apparente de 51.17kJmol(-1). Les ordres de reaction calcules de l'acide sulfurique et de l'oxygene etaient de -0.48 et de 1.01, respectivement. La reaction de lessivage suivait un modele de contraction du centre non reagi. On a etabli une equation modele de la cinetique pour la conversion du soufre. On a effectue des experiences orthogonales concernant la balance de l'acide du residu de lessivage sous pression d'oxygene. L'analyse de variance a montre que la temperature avait la plus grande influence sur ceci, alors on a examine davantage l'effet de la region de temperature (383-443K) sur la balance d'acide. Quand la temperature depassait 443K, l'augmentation du rapport d'oxydation du soufre etait trop grande, ce qui avait tendance a augmenter l'acidite du systeme.
引用
收藏
页码:438 / 447
页数:10
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