池和冰1，李博2，王艳华1，裴晓宇2，胡群2，王斌2
(1. 宝钢不锈钢有限公司，上海，200431；2. 内蒙古科技大学，内蒙古包头，014010)
关键词：钼精矿；挥发性；MoO3；CaMoO4
中图分类号：TF702+ 文献标识码: A
摘要：采用ICP-AES分析、XRD衍射分析和DSC-TG分析等方法对AOD直接合金化用钼精矿的化学成分、物相分析以及高温理化性能进行了分析，同时对几种钼酸盐的稳定性进行了分析。结果表明，该钼精矿的氧化钼品位为77.48wt.%，其中脉石的主要成分为SiO2，其次含有少量的CaO、Fe2O3和Al2O3等。该钼精矿主要的物相组成为MoO3和MoO2，同时还包括少量的CaMoO4。该钼精矿的粒度主要集中在200目以下，所占比例为88.90wt.%，其堆比重为2464.00kg/m3。MoO3能够在其熔点795℃附近完全挥发。MoO2比MoO3的挥发性弱，从804℃到1400℃升温结束，MoO2失重65.76wt.%。在空气气氛下，MoO2在较低温度440℃被氧化生成MoO3，即在氧化性气氛下MoO2会以MoO3的形式完全挥发。直接合金化温度超过1500℃，钼精矿的收率超过97wt.%，而且CaMoO4在铁水中1600℃以下主要被Si、Mn还原。
Physical and Chemical Properties of Molybdenum Concentrates and Researchof Alloying in AOD Furnace
CHI He-bing1，LI Bo2，WANG Yan-hua1，PEI Xiao-yu2，HU Qun2，WANG Bin2
(1. Baostell Stainless Steel Co.，Ltd.，Shanghai 200431，China；2. Materials and Metallurgy School,Inner Mongolia University of Science and Technology,Batou 014010,China)
Keywords: molybdenum concentrates;volatilization; molybdenum trioxide; calciummolybdate
Abstract: The chemical compositions,mineral compositions and high temperature properties of molybdenum concentrateswere examined by means of ICP-AES, XRD, DSC-TG and so on. The thermodynamicproperties of several molybdate were analyzed. The results show that the gradeof molybdenum oxide in the molybdenum concentrates amounts to 77.48% in massfraction and the gangue of the concentrates includes silicon dioxide, calciumoxide, ferric oxide and so on. Furthermore, the concentrates are composed of molybdenum trioxide, molybdenum dioxide andcalcium molybdate. The particle sizes of the concentrates mostly range below200 mesh, accounting for 88.90% in mass fraction. The bulk specific weight ofthe concentrates is 2 464.00kg/m3. In addition, molybdenum trioxide volatilizes completely at the temperatureof 795 ℃,but molybdenum dioxide volatilizes less than molybdenum trioxidedoes. The weigh loss molybdenum dioxide by evaporation is 65.76wt.% from 804℃ to 1400℃. Besides, molybdenum dioxide is easy to be oxidized into molybdenumtrioxide at 440℃. The yields of molybdenum concentrates exceeded 97% when the alloying temperature is higher than 1 500℃, while calcium molybdate was mainly reduced by silicon and manganese at a temperature lower than 1 600℃.