焙烧温度对高钙钒渣焙烧阶段关键生成物相的影响探讨  

Discussion on effects of roasting temperature on key product phases of high-calcium vanadium slag in roasting stage

作　　者：高健 钟祥 史志新 GAO Jian;ZHONG Xiang;SHI Zhixin(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：《冶金分析》2022年第9期32-39,共8页Metallurgical Analysis

摘　　要：温度是影响矿物晶体生长的关键因素之一,研究焙烧温度变化对钒渣焙烧阶段主要产物的影响规律以及更好认知钒渣焙烧过程具有积极意义。应用扫描电镜和能谱仪对高钙钒渣焙烧阶段关键生成物相的粒径、形貌及微区成分变化特征进行了考察,结果表明:氧化铁、铁板钛矿晶体粒径随焙烧温度上升而逐步增加。随温度上升,氧化铁逐渐由分布于钒尖晶石边缘的氧化铁边转变为规则圆粒状晶体,铁板钛矿逐步由析出于钒尖晶石内部的纳米级晶体转变为规则板状晶体,钒酸钙锰逐渐由分布于钒尖晶石边缘的环带状转变为包裹氧化铁、铁板钛矿的无定形状。随温度上升,赋存于氧化铁中的Si、Ca、V等元素含量总体逐渐减少,Cr、Mn元素含量总体逐渐增加。赋存于铁板钛矿中的Mg、Al、Si、Ca、V、Mn等元素含量在800℃之前随温度上升逐渐减少,温度上升至850℃,这些元素含量略有增加。随温度上升,赋存于钒酸钙锰中的Ca元素含量逐渐增加,Mn元素含量逐渐减少,钒酸钙锰逐渐向钒酸钙转变。Temperature is one of the key factors affecting the growth of mineral crystals.It is of positive significance to investigate the influence law of roasting temperature change on the main products of vanadium slag in roasting stage and to better understand the roasting process of vanadium slag.The change characteristics of key product phases of high-calcium vanadium slag in roasting stage,including the particle size,morphology,and micro-zone composition change,were investigated by scanning electron microscope and energy dispersive spectrometer.The results showed that the crystal grain size of iron oxide and pseudobrookite increased gradually with the increase of roasting temperature.With the increase of temperature,iron oxide gradually transformed from iron oxide edge which was distributed on the edge of vanadium spinel into regular round granular crystal.Meanwhile,pseudobrookite gradually transformed from nanometer crystal precipitated in vanadium spinel into regular tabular crystal.Calcium manganese vanadate gradually transformed from ring-like shape which was distributed on the edge of vanadium spinel into amorphous shape wrapping iron oxide and pseudobrookite.With the increase of temperature,the contents of Si,Ca,V and other elements in iron oxide decreased gradually in general,and the contents of Cr and Mn increased gradually in general.The contents of Mg,Al,Si,Ca,V and Mn in pseudobrookite gradually decreased with the rising temperature before 800℃,and the content of these elements increased slightly when the temperature increased to 850℃.With the rise of temperature,the content of Ca in calcium manganese vanadate gradually increased,and the content of Mn gradually decreased.Calcium manganese vanadate was gradually transformed into calcium vanadate.

关 键 词：焙烧温度 高钙钒渣 氧化铁 铁板钛矿 钒酸钙锰 

分 类 号：TF80[冶金工程—有色金属冶金] TG115.213[金属学及工艺—物理冶金] O657[金属学及工艺—金属学]