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首页> 中文期刊> 《中国有色金属学报（英文版）》 >不同温度下MoO3在KOH介质中的溶解动力学

不同温度下MoO3在KOH介质中的溶解动力学

         
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摘要

The dissolution kinetics of synthetic molybdite (MoO3) in a potassium hydroxide (KOH) medium was studied by varying the system temperature, KOH concentration, and particle size. Additionally, the effects of the stirring rate and different reagents such as barium hydroxide (Ba(OH)2), calcium hydroxide (Ca(OH)2), and sodium hydroxide (NaOH) were also evaluated. The experiments were performed in a reactor with controlled temperature and agitation. The results indicated that the dissolution reaction mechanism of molybdite generates potassium molybdate (K2MoO4) without intermediate compounds. Temperature (6?80 ℃), KOH concentration (0.0005?0.025 mol/L), and particle size (5?40μm) positively affected the dissolution of molybdite. The maximum Mo recovery was 67.5% in 0.25 h for 80 ℃ and 0.01 mol/L KOH. At the lowest temperature (6 ℃), which is near the freezing point of water (0 ℃), a substantial amount of Mo was recovered (17.8% in 45 min). The kinetics equation describing the molybdite dissolution in a KOH environment indicated that diffusion occurs through the porous layer. The activation energy was calculated to be 47.81 kJ/mol. A reaction order of 1.0 with respect to KOH concentration was obtained and was found to be inversely proportional to the squared particle size. The kinetics equation was obtained. The dissolution of molybdite resulting from the oxidation of a molybdenite concentrate (MoS2) led to a low molybdenum recovery, which was primarily caused by the consumption of KOH by impurities such as CaCO3 and Cr(MO4)3.%通过改变体系的温度、KOH浓度和粒径,研究合成的MoO3在氢氧化钾(KOH)介质中的溶解动力学,考察搅拌速率和和反应剂种类(如氢氧化钡、氢氧化钙和氢氧化钠等)的影响.实验是在一个可以控制温度和搅拌速率的反应器中进行的.结果表明,钼华的溶解反应生成了钼酸钾(K2MoO4),而没有中间化合物生成.温度(6~80℃)、KOH浓度(0.0005~0.025 mol/L)和粒径(5~40μm)对MoO3的溶解影响显著.在温度80℃、KOH浓度0.01 mol/L、反应时间0.25 h的条件下,钼的回收率最大,达67.5%.在接近水的冰点的最低温度(6℃)下,反应45 min后,钼的回收率为17.8%.建立了KOH环境中MoO3溶解的动力学方程,表明扩散是通过多孔层进行的.计算得到活化能为47.81 kJ/mol,KOH浓度的反应级数为1.0,与粒径的平方成反比,并得到了动力学方程.MoO3是辉钼矿精矿(MoS2)氧化的产物,它的溶解导致钼的回收率低,这主要是因为CaCO3和Cr(Mo4)3等杂质消耗了KOH.

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  • 来源
    《中国有色金属学报（英文版）》 |2018年第001期|177-185|共9页
  • 作者

    A. ARACENA; A. SANINO; O. JEREZ;

  • 作者单位

    Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2162, Cod. Postal 2362854, Valparaíso, Chile;

    Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2162, Cod. Postal 2362854, Valparaíso, Chile;

    Instituto de Geología Económica Aplicada (GEA), Universidad de Concepción, Casilla 160-C, Concepción, Chile;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类
  • 关键词

    MoO3溶解; 动力学; 氢氧化钾;

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