碱性低钒粉料提钒技术试验研究

Experimental study on vanadium extraction from alkaline vanadium-containing powder

某碱性粉料主要成分为硫酸钠,含V_(2)O_(5) 3.4%。该类碱性粉料无法直接酸溶、碱溶,如果直接焙烧再提钒,钒被氧化后,钒和大量硫酸钠均进入溶液中,形成一种低钒高钠的低钒溶液,后续从溶液中回收钒更困难。以该碱性低钒粉料为提钒原料,以水为溶剂溶解过滤后,可分离出87.94%的钒进入滤渣中,该滤渣中含V_(2)O_(5) 34%。对富含钒的滤渣开展了直接酸溶、碱溶、钠化焙烧提钒探索试验,选择钠化焙烧-水浸工艺对滤渣开展提钒技术研究,试验结果表明:滤渣干重100 g外配30 g碳酸钠,780℃煅烧90 min,焙烧熟料水浸,钒提取率可达97.96%,钒总收率可达86.15%。该技术研究为此类碱性低钒粉料提供一条提钒新思路。

In this study,the alkaline powder is mainly sodium sulfate,containing 3.4%V_(2)O_(5),which can not be dissolved in acid or alkali.If vanadium is directly roasted and then extracted,vanadium and a large amount of sodium sulfate will enter the solution and form a low vanadium solution with low vanadium and high sodium,and the subsequent recovery of vanadium from the solution is more difficult.With the alkaline low vanadium powder used as the raw material for extracting vanadium,87.94%vanadium can be separated into the filter residue after water dissolution and filtration,and the filter residue contains V_(2)O_(5)34%.Exploratory tests on vanadium extraction from vanadium-rich filter residue by direct acid dissolution,alkali dissolution and sodium roasting were carried out.The sodium roasting-water leaching process was selected for vanadium extraction technology research on the filter residue.The experimental results showed that the extraction rate of vanadium could reach 97.96%and the total yield of vanadium could reach 86.15%,according to the dry weight of 100 g with 30 g sodium carbonate,calcination at 780℃for 90 min and water leaching of the roasted residue.The study of this technology provides a new approach for extracting vanadium from this kind of alkaline low vanadium powder.