微波预处理对钼精矿制备钼酸铵过程的强化作用研究  

Study on the Strengthening Effect of Microwave Pretreatment on the Preparation of Ammonium Molybdate from Molybdenum Concentrate

作　　者：卜显忠[1] 张茜茹 王森[1] 薛季玮 宋学文[1] 宛鹤[1] 张崇辉[1] BU Xianzhong;ZHANG Xiru;WANG Sen;XUE Jiwei;SONG Xuewen;WAN He;ZHANG Chonghui(School of Resource Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,Shaanxi,China)

机构地区：[1]西安建筑科技大学资源工程学院,陕西西安710055

出　　处：《中国钼业》2023年第6期23-30,共8页China Molybdenum Industry

基　　金：国家自然科学基金项目(52074206);安徽省2021年重点研究与开发计划项目(编号:202104a07020012)。

摘　　要：钼酸铵作为钼精矿加工产品的中间产物在整个钼产业链中具有至关重要的作用。钼精矿中的残余药剂影响其焙烧氧化性以及后续生产钼酸铵的浸出率,常规预处理方法(搅拌、超声、焙烧)效果不明显。本研究将微波预处理应用于钼精矿的脱药,对比常规方法与微波预处理作用后的钼精矿焙烧氧化性以及钼酸铵浸出率,并通过紫外分光光度法、扫描电镜(SEM)、接触角测试、TOC全碳以及有机碳含量检测、热重-差动热(TG-DSC)以及红外热成像分析等手段研究了相关作用机理。结果表明:微波预处理后钼精矿接触角减小、表面产生裂痕;同时也降低了氧化反应的活化能,缩短了反应时间;且微波预处理直接加热钼精矿内部,减少了局部氧化,其焙烧氧化性提高了1.06个百分点,后续生产钼酸铵的浸出率提升了4.71个百分点。相关研究为工业生产中提高钼酸铵的浸出率提供了技术支撑。Ammonium molybdate,as an intermediate product in the processing of molybdenum concentrate,plays a vital role in the entire molybdenum industry chain.The residual chemicals in molybdenum concentrate affect its roasting oxidation and the leaching rate of ammonium molybdate in subsequent production,and the conventional pretreatment methods(stirring,ultrasonic,roasting)have no obvious effect.In this study,microwave pretreatment was applied to dedrug molybdenum concentrate,and compared the calcination oxidation of molybdenum concentrate and the leaching rate of ammonium molybdate after conventional method and microwave pretreatment.The relevant mechanism was studied by means of ultraviolet spectrophotometry,scanning electron microscopy(SEM),contact Angle test,TOC total carbon and organic carbon content detection,thermogravimetric differential heat(TG-DSC)and infrared thermal imaging analysis.The results show that the contact angle of molybdenum concentrate decreases and cracks appear on the surface after microwave pretreatment;at the same time,the activation energy of oxidation reaction is reduced and the reaction time is shortened;moreover,the microwave pretreatment directly heated the inside of molybdenum concentrate to reduce the local oxidation,and the oxidation ability was increased by 1.06%.The leaching rate of ammonium molybdate was increased by 4.71%.The related research provides technical support for improving the leaching rate of ammonium molybdate in industrial production.

关 键 词：钼精矿 钼酸铵 微波预处理 脱药 

分 类 号：TD982[矿业工程—选矿]