DISSOLUTION KINETICS OF PYRITE ORE BY HYDROCHLORIC ACID

British Journal of Applied Science and Technology Pub Date : 2011-03-25 DOI:10.4314/JAST.V16I1-2.64787

A. A. Baba, F. A. Adekola, O. Opaleye, R. B. Bale

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引用次数: 5

Abstract

Dissolution kinetics of pyrite ore (sourced from Nigeria) by hydrochloric acid were investigated. The elemental composition was determined by Inductively Coupled Plasma-Mass Spectrometry, while the mineral phase was characterized by powder X-ray diffractometry. The major elements in the ore were Fe (42.76 %), S (31.89 %), Si (7.35 %) and Zn (4.76 %). The minor elements consisted of Pb (2.63 %), Ag (1.39 %), and Mn (0.03 %), whi-le traces of Ca, Mg, V, Sb, Ni and Ra were also found. The major compounds in the ore were FeS2 and Fe2 (SO4)3, with associated mineral phases of ¥a-SiO2, Mn3O5, PbS and ZnS. The effects of HCl concentration, tem-perature and particle size on the dissolution rate indicated that about 76.4 % of the ore of < 0.1 mm particle size was dissolved at 80 ¢aC and stirring rate of 360 rpm. The dissolution rate was also dependence on hydrogen ion concentration of the reaction system. Activation energy of 38.8 kJ mol-1 and Arrhenius constant of 3.00 s-1 were obtained for the dissolution, confirming the rate controlling mechanism to be diffusion controlled surface chemi-cal reaction

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盐酸对黄铁矿的溶解动力学

研究了盐酸对尼日利亚黄铁矿的溶解动力学。元素组成采用电感耦合等离子体质谱法测定，矿物相采用粉末x射线衍射法表征。矿石中主要元素为Fe(42.76%)、S(31.89%)、Si(7.35%)和Zn(4.76%)。微量元素有Pb(2.63%)、Ag(1.39%)和Mn(0.03%)，微量元素有Ca、Mg、V、Sb、Ni和Ra。矿石中主要化合物为FeS2和Fe2 (SO4)3，伴生物相为¥a-SiO2、Mn3O5、PbS和ZnS。HCl浓度、温度和粒度对溶出率的影响表明，在80℃、360转/分搅拌速度下，< 0.1 mm粒度矿石的溶出率约为76.4%。溶解速率还与反应体系中氢离子浓度有关。溶出反应的活化能为38.8 kJ mol-1, Arrhenius常数为3.00 s-1，确定了其速率控制机理为扩散控制的表面化学反应

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British Journal of Applied Science and Technology

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