钒渣空白焙烧过程物相变化特征研究  

Study on phase variation characteristics of vanadium slag in blank-roasting process

作　　者：高健 GAO Jian(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,China;Pangang Group Research Institute Co.Ltd.,Panzhihua 617000,China;Sichuan Panyan Testing Technology Co.Ltd.,Panzhihua 617000,China)

机构地区：[1]钒钛资源综合利用国家重点实验室,四川攀枝花617000 [2]攀钢集团研究院有限公司,四川攀枝花617000 [3]四川攀研检测技术有限公司,四川攀枝花617000

出　　处：《中国有色冶金》2023年第6期131-138,共8页China Nonferrous Metallurgy

摘　　要：钒渣空白焙烧工艺属于钒渣提钒领域的新方法,明确物相变化特征对于构建和完善钒渣焙烧过程的物相演变机理具有重要意义。本文从以往钒渣物相研究中易忽略的物相含量、形貌和钒元素赋存状态着手,应用矿物分析仪、X射线衍射分析仪和扫描电镜等设备对空白焙烧阶段钒渣中主要物相的变化特征进行了分析,结果表明:钒尖晶石、铁橄榄石和钙铁辉石随焙烧温度上升而逐渐氧化分解,含量逐步降低,钒酸锰、氧化铁、铁板钛矿等产物含量逐渐增加;随焙烧温度上升,钒尖晶石、铁橄榄石及钙铁辉石由边缘氧化逐渐过渡至内部氧化直至完全分解,其中钒尖晶石的氧化分解产物主要为钒酸锰、氧化铁及铁板钛矿,铁橄榄石、钙铁辉石的氧化分解产物主要为氧化铁和玻璃质;焙烧过程,钒渣中的钒元素主要由钒尖晶石向钒酸锰、氧化铁和铁板钛矿等物相迁移;900℃是钒渣空白焙烧的合适温度。The blank-roasting process of vanadium slag is a new method in the field of vanadium extraction from vanadium slag.It is of great significance to clarify phase variation characteristics to construct and improve the phase evolution mechanism of vanadium slag in roasting process.In this paper,starting from the phase content,morphology and occurrence of vanadium element that were easily neglected in previous phase study of vanadium slag,the variation characteristics of main phase in blank-roasting stage of vanadium slag were analyzed by equipments of mineral analyzer,XRD and SEM.The results showed that:vanadium spinel,fayalite and hedenbergite were gradually oxidized and decomposed with the increase of temperature,as well as a gradual reduction of their content.The content of manganese vanadate,iron oxide,pseudobrookite and other products increased gradually when the temperature rised.With the increase of temperature,vanadium slag,fayalite and hedenbergite were gradually transited from edge oxidation to internal oxidation until they were decomposed completely.And the oxidation and decomposition products of vanadium spinel were manganese vanadate,iron oxide and pseudobrookite,the oxidation and decomposition products of fayalite and hedenbergite were iron oxide and vitric.The vanadium element in vanadium slag mainly migrated from vanadium spinel to manganese vanadate,iron oxide and pseudobrookite.And the appropriate temperature for blank-roasting of vanadium slag was 900℃.

关 键 词：钒渣 空白焙烧 钒尖晶石 铁橄榄石 钙铁辉石 物相变化特征 

分 类 号：TF841.3[冶金工程—有色金属冶金] TF801.3