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首页> 外文学位 >A kinetic study of the dissolution of nickel sulfide in acidified ferrous sulfate solution with a gas mixture of oxygen and sulfur dioxide.
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A kinetic study of the dissolution of nickel sulfide in acidified ferrous sulfate solution with a gas mixture of oxygen and sulfur dioxide.

机译：用氧气和二氧化硫的混合气体在酸性硫酸亚铁溶液中溶解硫化镍的动力学研究。

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摘要

In the field of hydrometallurgy of base metals, continuing interest exists towards the exploitation of ferric iron as a leaching medium. A modified leaching process involving ferrous sulfate-oxygen-sulfur dioxide system has emerged from this study as a suitable alternative for the treatment of sulfide minerals. The attractive feature of this system is that unlike ferric sulfate, it can be operated without excess sulfate ion, it is readily available and cost less than the ferric sulfate.; This research was concerned with the kinetic study of the dissolution of nickel sulfide in acidified ferrous sulfate solution with a gas mixture of oxygen and sulfur dioxide. The effects of agitation, initial sulfuric acid concentration, sulfur dioxide partial pressure, oxygen flowrate, temperature, total iron concentration and pulp density were examined. The leaching results fit a surface reaction model. The activation energy was calculated to be 14.4 kcal/mol which is reasonable for a rate limiting surface reaction. The order of reaction was 0.50 with respect to the total iron concentration at iron concentrations between 0.010 and 0.10 M. This is indicative of an electrochemical reaction mechanism. The anodic reaction involves the oxidation of nickel sulfide to nickel ions and elemental sulfur. The cathodic reaction is the reduction of ferric to ferrous ions.; A kinetic model for the ferrous sulfate-oxygen-sulfur dioxide leaching of nickel sulfide was also obtained for total iron concentration in the range 0.01 to 0.10 M and is given by: (1-(1-f){dollar}sp{lcub}1/3{rcub}rbrack = {lcub}1.26 times 10sp7{dollar} (Fe) {dollar}sb{lcub}rm t{rcub}sp{lcub}1/2{rcub}{dollar}exp(-14462/RT){dollar}{rcub}{dollar}t; This model is in excellent agreement with the experimental results for fractions of nickel extracted up to 0.95.
机译：在贱金属的湿法冶金领域中，人们对将三价铁用作浸出介质的兴趣不断增长。这项研究提出了一种涉及硫酸亚铁-氧气-二氧化硫系统的改进浸出工艺，作为处理硫化物矿物的合适替代品。该系统的吸引人之处在于，与硫酸铁不同，它可以在没有过量硫酸根离子的情况下进行操作，与硫酸铁相比，它易于获得且成本更低。这项研究涉及在氧气和二氧化硫的混合气体中将硫化镍溶解在酸化的硫酸亚铁溶液中的动力学研究。检查了搅拌，初始硫酸浓度，二氧化硫分压，氧气流量，温度，总铁浓度和纸浆密度的影响。浸出结果符合表面反应模型。活化能经计算为14.4kcal / mol，这对于限速表面反应是合理的。在0.010至0.10M之间的铁浓度下，反应顺序相对于总铁浓度为0.50。这指示电化学反应机理。阳极反应涉及将硫化镍氧化为镍离子和元素硫。阴极反应是将铁还原为亚铁离子。还获得了总铁浓度在0.01至0.10 M范围内的硫化亚铁的硫酸亚铁-氧-二氧化硫浸出的动力学模型，其动力学模型为：（1-（1-f）{dol}} sp {lcub} 1/3 {rcub} rbrack = {lcub} 1.26乘以10sp7 {dollar}（Fe）{dollar} sb {lcub} rm t {rcub} sp {lcub} 1/2 {rcub} {dollar} exp（-14462 / RT）{dollar} {rcub} {dollar} t；该模型与镍提取物（最高提取到0.95）的实验结果非常吻合。

著录项

  • 作者

    Kwateng, David Opoku.;

  • 作者单位

    Columbia University.;

  • 授予单位 Columbia University.;
  • 学科 Engineering Metallurgy.
  • 学位 Eng.Sc.D.
  • 年度 1990
  • 页码 236 p.
  • 总页数 236
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;
  • 关键词

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