Features and mechanisms of self-sintering of molybdenite during oxidative roasting  

辉钼矿氧化焙烧自烧结的特点与机制

作　　者：Hu SUN Guang-hui LI Qun-zhen BU Zhong-qiao FU Hui-bo LIU Xin ZHANG Jun LUO Ming-jun RAO Tao JIANG 孙虎;李光辉;卜群真;傅中乔;刘会波;张鑫;罗骏;饶明军;姜涛(中南大学资源加工与生物工程学院,长沙410083;难冶有色金属资源高效利用国家工程实验室,长沙410083)

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China [2]National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第1期307-318,共12页中国有色金属学报（英文版）

基　　金：financially supported by the Basic Science Center Program of the National Natural Science Foundation of China(No.72088101);the General Program of the National Natural Science Foundation of China(No.51874355);the Special Funding of China Postdoctoral Science Foundation(No.2020T130730)。

摘　　要：Roasting experiments were carried out with pure reagents as raw materials.The self-sintering behaviors of molybdenite(MoS_(2))during oxidation were investigated by thermodynamic calculation,XRD,SEM-EDS and high-temperature in situ analysis.The results indicate that the desulfurization efficiency of MoS_(2) pellet decreases with the increase of roasting temperature from 600 to 700℃,owing to the expansion of sintered area.At the very beginning of roasting,sintered layer can be rapidly formed and cover the pellet surface on the windward side,and meanwhile,MoO_(2)and Mo_(4)O_(11) intensively appear and constitute the sintered layer together with MoO_(3).Moreover,it is proven that MoO_(3)-rich products containing low-valence molybdenum oxides have low melting points,thus easy to be melted during the occurrence of exothermic reaction between MoS_(2) and O_(2),which leads to the sintering of materials.以纯试剂为原料进行焙烧试验,采用热力学计算、XRD、SEM-EDS、高温原位分析等手段,研究辉钼矿(MoS_(2))氧化过程的自烧结行为。结果表明,当焙烧温度由600℃提高至700℃时,辉钼矿团块中物料烧结的面积随之增大,导致脱硫效率降低。烧结层在氧化焙烧的初期快速形成,且常覆盖在团块迎风侧表面。在物料烧结的同时,MoO_(2)和Mo_(4)O_(11)也集中生成,与MoO_(3)共同构成烧结层。进一步研究发现,含低价钼氧化物的富MoO_(3)产物熔点较低,在MoS_(2)与O_(2)反应剧烈放热时易发生熔化,致使物料烧结。

关 键 词：MOLYBDENITE oxidative roasting SINTERING distribution characteristic mechanism 

分 类 号：TF046[冶金工程—冶金物理化学]