發(fā)布時(shí)間：2018-03-23 19:39

  本文選題：轉(zhuǎn)浸率　切入點(diǎn)：焙燒溫度　出處：《有色金屬(選礦部分)》2016年02期

【摘要】：對四種不同焙燒時(shí)間下的焙燒渣和酸浸后的殘?jiān)M(jìn)行浸出前后EDS形貌分析、MLA物相含量分布和釩元素賦存形式和走向?qū)Ρ确治鲅芯�。結(jié)果表明,釩渣焙燒前后釩尖晶石由致密光滑的表面變成表面凹凸不平且形成多孔的結(jié)構(gòu);MLA物相分析數(shù)據(jù)顯示,焙燒渣和殘?jiān)形锵嗟姆N類變化不大,但是由于釩酸鈣的大量減少導(dǎo)致物相含量在浸出前后變化很大;釩元素分布測試結(jié)果表明,焙燒前期影響釩轉(zhuǎn)浸率的因素是氧化鐵固溶體相因固溶大量的釩和其他雜質(zhì)元素難以被酸浸出;當(dāng)焙燒時(shí)間達(dá)到360 min后影響釩轉(zhuǎn)浸率的主要因素為燒結(jié)形成的輝石—硅酸鈣過渡相阻礙了氧的擴(kuò)散導(dǎo)致部分釩元素包裹其中而難以被酸浸出。
[Abstract]:Four kinds of roasting slag and residue after acid leaching were analyzed by EDS before and after leaching. Before and after calcination of vanadium slag, vanadium spinel changed from compact and smooth surface to rugged surface and formed porous structure and MLA phase analysis data showed that the type of phase in calcined slag and residue changed little. However, due to the decrease of calcium vanadate, the phase content changes greatly before and after leaching. The factors that influence the leaching rate of vanadium in the early stage of roasting are that the solid solution phase of ferric oxide is difficult to be leached by acid because of the large amount of vanadium and other impurity elements. When the calcination time is up to 360 min, the main factor affecting the leaching rate of vanadium is that the transition phase of pyroxene and calcium silicate formed by sintering hinders the diffusion of oxygen, which results in the partial vanadium element being wrapped in it and difficult to be leached out by acid.
【作者單位】： 攀鋼集團(tuán)研究院有限公司釩鈦資源綜合利用國家重點(diǎn)實(shí)驗(yàn)室;
【分類號】：TD954

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