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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。
Differences in phase transformation during calcination roasting and acid leaching processes have a large effect on total vanadium conversion. Through the analysis of vanadium slag, clinker and residue vanadium phase microstructure, morphology and vanadium elemental analysis, the results show that: during the calcination roasting process vanadium spinel from the initial smooth dense polygons gradually oxidized into a porous state until Finally, the resulting uneven “round granular ” iron oxide and “short columnar ” iron titanium ore, vanadium element is also initially enriched in vanadium spinel gradually to calcium vanadate, iron oxide, iron titanium Ore and silicate. The most obvious change in acid leaching process is that the rough vanadium-containing oxides (iron oxide, iron brookite and calcium vanadate) gradually become “hollow” Most of the vanadium elements have been leached by sulfuric acid. The remaining vanadium elements are mainly found in iron oxide, iron-barite and calcium silicate.