摘要:
针对传统提钒工艺的不足,研究了无焙烧常压酸浸、无盐氧化焙烧常压酸浸以及无焙烧氧压酸浸等三种提钒工艺。试验结果表明:无焙烧常压酸浸提钒过程中,提高酸浸温度和硫酸浓度可以提高钒浸出率,但是浸出渣中的钒含量较高,钒渣的综合利用程度不高;无盐氧化焙烧常压酸浸提钒过程中,焙烧过程中转炉钒渣的含钒尖晶石相晶格结构发生裂解转变,是后续酸浸提钒过程能够有效进行的关键之处;无焙烧氧压酸浸试验过程中,在初始硫酸浓度为150 g/L,氧气分压0.6 MPa,液固比8:1,反应温度110℃的条件下,钒的浸出率可以达到92%左右。
Abstract:
For researching a more efficient vanadium extraction process,the processes of atmospheric pressure acid-leaching without roasting,none salt roasting with atmospheric pressure acid-leaching and oxygen pressure acid-leaching without roasting were researched.The results indicate that:During the atmospheric pressure acid-leaching without roasting process,the leaching rate of vanadium increases with the enhancement of temperature and initial acid concentration,but the content of vanadium in the leaching residue is still high and the degree of utilization of vanadium slag is not enough;During the none salt roasting with atmospheric pressure acid-leaching process,the transformation of spinel phase in the roasting process is the key step for the vanadium extraction;In the process of oxygen pressure acid-leaching without roasting,under the conditions of initial acid concentration of 150 g/L,the oxygen partial pressure of 0.6 MPa and liquid-solid ratio of 8:1 at 110℃ for 45 min,the vanadium leaching rate is about 92%.
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