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含钒钢渣可作为提钒的重要原料。首先,对某含钒钢渣的性质进行了分析,结果表明,含钒钢渣中钙、铁含量很高,这将会导致直接硫酸浸钒时酸耗较高;含钒钢渣中的钒主要以酸溶的V4+形式存在,无需焙烧氧化、可直接酸浸溶出提钒;含钒钢渣中的钒弥散分布于多种矿相中,其中钙钛氧化物为最主要的含钒矿物。然后,依据含钒钢渣的性质特点,采用常温常压下直接硫酸浸出法从中提钒,并考察了各主要因素对钒浸出率的影响和内在原因,结果表明,硫酸用量、搅拌与否对钒的浸出有显著影响,时间、液固比及搅拌强度的影响较小,细度达到-74μm占60%后即可保证较高的浸出率。最终,常温常压下,在最佳条件硫酸用量90%、时间2 h、细度-74μm占60%、液固比4∶1、搅拌强度200 r·min-1时,钒浸出率高达94.10%,与传统提钒方法相比,浸钒指标大幅提升。常温常压下直接硫酸浸出法可省去复杂的焙烧系统、突破氧压酸浸的局限,流程简单、作业环境好、浸出指标高;但该法酸耗较高,如何降低酸耗,值得进一步研究。
Vanadium-containing slag can be used as an important raw material to mention vanadium. First of all, the properties of a vanadium-bearing steel slag were analyzed. The results show that the content of calcium and iron in the vanadium-bearing steel slag is very high, which will lead to high acid consumption when vanadium is directly dipped in vanadium. The vanadium in vanadium- V4 + exists in the form of V4 +, without the need of roasting and oxidation. The vanadium can be leached directly by acid leaching and dissolution. Vanadium dispersed in vanadium-bearing steel slag is distributed in various mineral phases, among which calcium-titanium oxide is the most important vanadium-bearing mineral. Then, based on the properties of vanadium-bearing steel slag, vanadium was extracted by direct sulfuric acid leaching method at room temperature and normal pressure. The effects of various factors on the leaching rate of vanadium were investigated. The results showed that sulfuric acid dosage, Of the leaching has a significant impact on the time, liquid to solid ratio and the impact of stirring intensity is small, fineness of -74μm accounted for 60% to ensure a higher leaching rate. Finally, under the normal temperature and pressure conditions, the vanadium leaching rate was as high as 94.10 under the optimal conditions of 90% sulfuric acid, 2 h, 60% fineness-74μm, liquid-solid ratio 4:1 and stirring intensity 200 r · min-1 %, Compared with the traditional vanadium extraction method, vanadium dip significantly increased. The method of direct sulfuric acid leaching at room temperature and pressure can save complicated roasting system, break through the limitation of oxygen pressure acid leaching, simple process, good working environment and high leaching index. However, the acid consumption of the method is high, so how to reduce the acid consumption is worth further the study.