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Volume 31 Issue 1
Jan.  2024
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文章导航 >  矿物冶金与材料学报（英文）  > 2024  >  31(1): 91-105
Fengjuan Zhang, Chenhui Liu, Srinivasakannan Chandrasekar, Yingwei Li, and Fuchang Xu, Preparation of sodium molybdate from molybdenum concentrate by microwave roasting and alkali leaching, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 91-105. https://doi.org/10.1007/s12613-023-2727-1
Cite this article as:
Fengjuan Zhang, Chenhui Liu, Srinivasakannan Chandrasekar, Yingwei Li, and Fuchang Xu, Preparation of sodium molybdate from molybdenum concentrate by microwave roasting and alkali leaching, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 91-105. https://doi.org/10.1007/s12613-023-2727-1
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研究论文

微波焙烧–碱浸法由钼精矿制备钼酸钠

  • 1)

    云南民族大学化学与环境学院，昆明 650500，中国

  • 2)

    Chemical Engineering Department, Khalifa University, Abu Dhabi, UAE

  • 3)

    云南中钛科技有限公司，昆明 650500，中国

  • 4)

    云南永昌硅业股份有限公司，保山678000，中国


  • 通讯作者:

    刘晨辉    E-mail: liu-chenhui@hotmail.com

    SrinivasakannanChandrasekar    E-mail: srinivasa.chandrasekar@ku.ac.ae

文章亮点

  • (1) 提出了一种通过微波氧化焙烧和碱浸出法从钼精矿中高效回收钼的新工艺。
  • (2) 钼酸钠的浸出率和含量达到96.24%和94.08%。
  • (3) 碳酸钠溶液可有效去除粗钼酸钠溶液中的铁和铝杂质。
  • 钼酸钠制备工艺存在能耗高、热效率低、三氧化钼原料要求高等缺点，为了实现对钼精矿资源的绿色高效开发，本文提出了微波强化焙烧及碱浸从钼精矿中高效回收钼，并制备钼酸钠产品的新工艺。热力学分析表明了氧化焙烧钼精矿的可行性，升温有利于MoO3的生成。研究了微波焙烧温度、保温时间和功率质量比分别对钼焙砂和浸出产物钼酸钠(Na2MoO4·2H2O)的影响。在优化工艺条件下：焙烧温度700°C、保温时间110 min和功率质量比110 W/g，钼的存在状态由硫化钼转化为三氧化钼。对钼焙砂碱浸制备钼酸钠工艺进行研究，确定优化浸出条件为氢氧化钠溶液浓度2.5 mol/L、液固比2 mL/g、浸出温度60°C、浸出液终点pH为8，获得钼酸钠的浸出率为96.24%。浸出除杂后的钼酸钠的含量达到94.08%。碳酸钠溶液调节浸出液pH可有效分离出铁、铝杂质。本研究避免了传统工艺的不足，利用微波冶金的优势制备出高品质的钼酸钠，为钼精矿的高值化利用提供了新思路。
    • Research Article

    Preparation of sodium molybdate from molybdenum concentrate by microwave roasting and alkali leaching

    + Author Affiliations
      Abstract
    • The preparation process of sodium molybdate has the disadvantages of high energy consumption, low thermal efficiency, and high raw material requirement of molybdenum trioxide, in order to realize the green and efficient development of molybdenum concentrate resources, this paper proposes a new process for efficient recovery of molybdenum from molybdenum concentrate and preparation of sodium molybdate by microwave-enhanced roasting and alkali leaching. Thermodynamic analysis indicated the feasibility of oxidation roasting of molybdenum concentrate. The effects of roasting temperature, holding time, and power-to-mass ratio on the oxidation product and leaching product sodium molybdate (Na2MoO4·2H2O) were investigated. Under the optimal process conditions: roasting temperature of 700°C, holding time of 110 min, and power-to-mass ratio of 110 W/g, the molybdenum state of existence was converted from MoS2 to MoO3. The process of preparing sodium molybdate by alkali leaching of molybdenum calcine was investigated, the optimal leaching conditions include a solution concentration of 2.5 mol/L, a liquid-to-solid ratio of 2 mL/g, a leaching temperature of 60°C, and leaching solution termination at pH 8. The optimum conditions result in a leaching rate of sodium molybdate of 96.24%. Meanwhile, the content of sodium molybdate reaches 94.08wt% after leaching and removing impurities. Iron and aluminum impurities can be effectively separated by adjusting the pH of the leaching solution with sodium carbonate solution. This research avoids the shortcomings of the traditional process and utilizes the advantages of microwave metallurgy to prepare high-quality sodium molybdate, which provides a new idea for the high-value utilization of molybdenum concentrate.
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