钙化提钒焙浸工艺中含钒物相结构及其演变规律研究  

Study on the Structure of Vanadium-containing Phase and Its Evolution during the Calcination and Leaching Processes for Calcification Extraction of Vanadium

作　　者：史志新[1] 

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

出　　处：《钢铁钒钛》2016年第5期15-19,共5页Iron Steel Vanadium Titanium

摘　　要：钙化焙烧和酸浸工艺中物相转变差异会对总钒转化率产生比较大的影响。通过对钒渣、熟料和残渣中含钒物相微观结构、形貌以及钒元素走向进行分析,结果表明:钙化焙烧过程中钒尖晶石由初始光滑致密的多边形逐渐氧化成多孔状态,直至最后生成凹凸不平的"圆粒状"氧化铁和"短柱状"铁板钛矿,钒元素也由最初富集在钒尖晶石中逐渐向钒酸钙、氧化铁、铁板钛矿和硅酸盐中转移;酸浸过程中最明显的变化为由熟料中凹凸不平的含钒氧化物(氧化铁、铁板钛矿和钒酸钙)逐渐开始变为"镂空状"的铁板钛矿相,大部分钒元素已被硫酸浸出,残留的钒元素主要赋存在氧化铁、铁板钛矿和硅酸钙中。The difference of phase transition during the processes of calcium roasting and acid leaching of vanadium slag has a significant influence on the total vanadium conversion rate. The microstructure and morphology of the vanadium-containing phases, and trend of vanadium during those phases in vanadium slag, clinker and residue were analyzed. The results show that the vanadium spinel with initial smooth and dense polygon structure is gradually oxidized into porous state, and finally forms concavo-convex granular iron oxides and short columnar pseudobrookite. The vanadium element initially enriched in vanadium spi- nel, gradually transfers into calcium vanadate, iron oxides, pseudobrookite and sihcate phases. The most significant change in the acid leaching process is that the concavo-convex vanadium-containing oxides （ i- ron oxides, pseudobrookite and calcium vanadate） in clinker change into hollow pseudobrookite phase step by step, and most of the vanadium has been extracted by sulfuric acid with the residual vanadium mainly remained in iron oxides,pseudobrookite and calcium silicate phases.

关 键 词：钒渣 钙化焙烧 酸浸 钒尖晶石 

分 类 号：TF841.3[冶金工程—有色金属冶金]