摘要
通过动力学分析和SEM-EDS、MLA、ICP等分析技术研究钼精矿处理过程中钾释放的动力学特征和机理。结果表明,钼焙砂在水洗和氨浸过程中钾释放的最佳动力学模型均为一级动力学模型,且钾在钼精矿中主要以可溶性钾离子和4种含钾矿物的形式存在。在钼精矿的焙烧过程中,一部分云母分解生成正长石,而另一部分云母则与杂质金属元素结合后形成钡铁云母。此外,快速冷却可有效抑制钼焙砂中云母向正长石的分解转化。研究结果可为降低钼酸铵产品中的钾含量提供依据。
The kinetic characteristics and mechanism of potassium release in the molybdenum concentrate treatment process were studied by kinetic analysis and analytical techniques such as SEM−EDS,MLA and ICP.The results show that the first-order kinetic model is the best kinetic model of potassium release in the water washing and ammonia leaching process.Potassium is present in molybdenum concentrate in the form of soluble potassium ions and four potassium minerals.During the roasting process of molybdenum concentrate,some muscovite decomposed into orthoclase,while other muscovite combined with impurity metal elements to form anandite.Furthermore,the transformation of muscovite to orthoclase could be effectively inhibited by the rapid cooling of molybdenum calcine.The results could provide a basis for reducing potassium content in ammonium molybdate products.
作者
刘起航
胡蕖
王帝
杨双平
何凯
Qi-hang LIU;Qu HU;Di WANG;Shuang-ping YANG;Kai HE(School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Technical Centre,Jinduicheng Molybdenum Co.,Ltd.,Xi’an 710077,China)
基金
the financial support from the Natural Science Foundation of Shaanxi Province, China (No. 2019JLM-34)。
关键词
钼精矿
除钾
焙烧
含钾矿物
钼酸铵
molybdenum concentrate
potassium removal
roasting
potassium minerals
ammonium molybdate
