钼焙砂焙烧过程中杂质的可溶性转化机理  

Solubility Conversion Mechanism of Impurities during Calcination of Molybdenum Calcine

作　　者：刘起航[1] 袁文浓 王苗[1] 杨双平[1] 冯卫国[2] LIU Qihang;YUAN Wennong;WANG Miao;YANG Shuangping;FENG Weiguo(School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China;Jinduicheng Molybdenum Co.,Ltd.,Xi′an 710077,China)

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055 [2]金堆城钼业股份有限公司,西安710077

出　　处：《有色金属工程》2024年第3期82-89,共8页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(52374345);陕西省自然科学基金资助项目(2022JQ-302)。

摘　　要：钼焙砂中杂质的去除因酸洗的取消而成为企业面临的新挑战,在焙烧过程中杂质矿物能否转化为可溶离子对当前水洗除杂具有重要意义。采用激光粒度仪、X射线衍射(XRD)等传统方法对钼精矿的粒度、孔径、元素等进行了分析,结合矿物解离分析仪(MLA)和Factsage热力学软件研究了钼焙砂生产过程中杂质元素的赋存形态变化,探索了杂质矿物转变为可溶性离子的具体路径。结果表明,钼精矿和钼焙砂都存在纳米级孔隙,会阻碍水洗除杂。铝钾矿物作为主要的不可溶性杂质对高纯钼产品生产有较大影响,且多以较大分子量的碱性矿物形式存在。钼精矿在焙烧过程中,白云母、正长石等含K矿物可部分转化为K+、Al3+等可溶性离子,再经水洗去除。加湿提高了正长石在焙烧过程中向可溶性离子的转化程度,有利于洗涤过程中杂质的去除。The removal of impurities in molybdenum calcine has become a new challenge for enterprises due to the cancellation of pickling.Whether the impurity minerals can be converted into soluble ions in the roasting process is of great significance for the current washing.In this paper,the traditional methods such as laser particle size analyzer and X-Ray Diffraction(XRD)were used to analyze the particle size,pore size and elements of molybdenum concentrate.Combined with Mineral Liberation Analyzer(MLA)and Factsage thermodynamic software,the changes in the occurrence forms of impurity elements during the production of molybdenum calcine were studied,and the specific path of impurity minerals transforming into soluble ions was explored.The results show that there are nanoscale pores in both molybdenum concentrate and molybdenum calcine,which will prevent washing and impurity removal.As the main insoluble impurities,aluminum potassium minerals have a great influence on the production of high purity molybdenum products,and most of them exist in the form of alkaline minerals with large molecular weight.In the roasting process of molybdenum concentrate,K-containing minerals such as muscovite and orthoclase can be partially converted into soluble ions such as K+and Al 3+,and then removed by washing.Humidification improves the degree of conversion of orthoclase into soluble ions during roasting and is beneficial to the removal of impurities during washing.

关 键 词：钼精矿 钼焙砂 水洗 除杂 

分 类 号：TF841.2[冶金工程—有色金属冶金]