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20卷    第5期    总第134期    2010年5月

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文章编号:1004-0609(2010)05-1013-08
超声波辅助硫化镍矿氧化浸出动力学
薛娟琴,毛维博,卢  曦,李京仙,王玉洁,吴  明

(西安建筑科技大学 冶金工程学院,西安 710055)

摘 要: 选用过硫酸盐+银盐作氧化剂,在超声波作用下对硫化镍矿进行直接氧化浸出,研究搅拌速率、过硫酸钠浓度、浸出温度、银盐浓度及粒度对镍浸出率的影响规律,探讨氧化浸出反应机理。结果表明:在一定范围内,在超声波作用下搅拌速率或者粒度的变化对镍浸出率影响不显著;镍浸出率随Na2S2O8浓度的增大以及温度的升高而增加,但是当温度高于70 ℃后,浸出率的增加不明显;在浸出过程中起主导作用的是S2O82−,少量银盐的存在对浸出反应有促进作用。通过对该体系浸出过程动力学参数的考察,发现其符合缩核模型,过程总体反应速率受界面化学反应控制,表观活化能为39.67 kJ/mol,建立了浸出过程的宏观动力学方程。

 

关键字: 硫化镍矿;氧化浸出;动力学;表现活化能;超声波;缩核模型;界面化学反应

Dynamics of ultrasound-assisted oxidation leaching of
nickel sulfide concentrate
XUE Juan-qin, MAO Wei-bo, LU Xi, LI Jing-xian, WANG Yu-jie, WU Ming

School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

Abstract:The method of leaching nickel directly with oxidants of sulphate and silver salts with the assistance of ultrasonic was proposed. The influence of stirring speed, S2O82 concentration, leaching temperature, silver ion concentration and granularity on the leaching rate of nickel was investigated. The reaction mechanism of oxidizing leaching was explored. The results show that the influence of stirring speed or granularity on the leaching rate is not obvious in a certain range; with the increase of S2O82 concentration or leaching temperature, the leaching rate of nickel increases, whereas when the temperature is above 70 ℃, the increase of leaching rate is not obvious; S2O82− plays a dominant role in the oxidation action during the leaching process. The presence of a small amount of silver salt can promote the leaching reaction. Through investigating the dynamic parameters of the process, the dynamics in accordance with the shrinking core model is found. The overall reaction rate is controlled by interfacial chemical reaction with apparent activation energy of 39.67 kJ/mol. The macro-dynamic equations of the process are established.

 

Key words: nickel sulfide concentrate; oxidation leaching; dynamic; apparent activity energy; ultrasound; shrinking core model; interfacial chemical reaction

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

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

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