Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第9期    总第258期    2020年9月

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文章编号:1004-0609(2020)-09-2151-11
闪锌矿加压浸出体系下Mn2+催化机理与动力学
陈丽杰1, 2,龚 傲1, 2,吴选高1, 2,刘 燕1, 2,张廷安1, 2,田 磊1, 2

(1. 江西理工大学 绿色冶金与过程强化研究所,赣州 341000;
2. 东北大学 多金属共生矿生态化冶金教育部重点实验室,沈阳 110819
)

摘 要: 研究了闪锌矿加压搅拌浸出体系下Mn2+催化机理与动力学。将ZnS和FeS烧结制备人造闪锌矿,并用于加压酸浸实验。通过使用自行设计的电位高压釜研究压力浸出系统的电位变化。结果表明:随着浸出时间的推移直到浸出结束,体系电位持续升高,故Mn2+在多大程度上能够实现催化作用,取决于Mn2+氧化为MnO2的反应速度和控制条件。随着温度、硫酸浓度、氧分压的增大,相应的氧压浸出速率及浸出率均有较大的提高,最终,通过闪锌矿氧压酸浸动力学模型的分析得出,在Mn2+催化浸出体系下,反应活化能为27.34 kJ/mol,硫酸浓度、氧分压及Mn2+用量的反应级数分别为1.23、1.64和0.36,表明其应遵循化学反应及表面扩散混合控制的收缩核模型,并建立了相应的动力学方程。

 

关键字: Mn2+催化机理;人造闪锌矿;浸出动力学;加压浸出;体系电位

Catalytic mechanism and kinetics of Mn2+ under sphalerite pressure leaching system
CHEN Li-jie1, 2, GONG Ao1, 2, WU Xuan-gao1, 2, LIU Yan1, 2, ZHANG Ting-an1, 2, TIAN Lei1, 2

1. Institute of Green Metallurgy and Process Intensification, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China

Abstract:The catalytic mechanism and kinetics of Mn2+ under the sphalerite pressurized agitation leaching system were studied. Artificial sphalerite was prepared by sintering ZnS and FeS and used in pressure acid leaching experiment. The potential changes of pressure leaching system were studied by using the autoclave designed by ourselves. The results show that as the leaching time goes on until the end of leaching, the system potential continues to increase, so the extent to which Mn2+ can achieve catalytic action depended on the reaction conditions of oxidation of Mn2+ into MnO2. With the increases of temperature, acidity and oxygen partial pressure, the corresponding oxygen pressure leaching speed and leaching rate all have large increase at the end, through the analysis of sphalerite oxygen pressure acid leaching kinetics model, in manganese ion catalyzed leaching system, the activation energy is 27.34 kJ/mol, the dosage of sulfuric acid, oxygen partial pressure and Mn2+ reaction series are 1.23, 1.64 and 0.36, respectively, showing that it should follow and surface chemical reaction diffusion retract model of hybrid control, and the corresponding dynamic equation is established.

 

Key words: Mn2+ catalytic mechanism; artificial sphalerite; leaching kinetics; pressure leaching; system potential

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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