钒页岩氧压酸浸过程中V与Fe的分离工艺研究

金属矿山 ›› 2018, Vol. 47 ›› Issue (01): 107-111.

钒页岩氧压酸浸过程中V与Fe的分离工艺研究

王露瑶^1,2,3，张一敏^1,2,3，黄晶^1,2,3，刘涛^1,2,3，薛楠楠^1,2

1.武汉科技大学资源与环境工程学院，湖北武汉 430081；2,湖北省页岩钒资源高效清洁利用工程技术研究中心，湖北武汉 430081；3.钒资源高效利用湖北省协同创新中心，湖北武汉 430081

出版日期:2018-01-15 发布日期:2018-03-13

Separation Process of Vanadium and Iron during Oxygen Pressure Acid Leaching of Vanadium Shale

Wang Luyao^1,2,3，Zhang Yimin^1,2,3，Huang Jing^1,2,3，Liu Tao^1,2,3，Xue Nannan^1,2

1.School of Resources and Environmental Engineering，Wuhan University of Science and Technology，Wuhan 430081，China；2.Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource，Wuhan 430081，China；3.Hubei Provincial Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources，Wuhan 430081，China

Online:2018-01-15 Published:2018-03-13

摘要/Abstract

摘要： 为了确定湖北某钒页岩氧压酸浸条件，以K₂SO₄为添加剂，对在氧压酸浸提V过程中K₂SO₄用量、硫酸的体积浓度、氧分压、浸出温度、浸出时间对V、Fe浸出率的影响进行了研究。结果表明，在K₂SO₄用量为7%、硫酸浓度为15%、浸出时间为5 h、氧分压为2.0 MPa、浸出温度为190 ℃条件下，V的浸出率为89.90%、Fe的浸出率仅为5.73%，较无K₂SO₄条件下V的浸出率提高，Fe的浸出率大幅降低。XRD、FTIR分析表明，K₂SO₄的介入能强化云母晶体结构的破坏，促进V的释放，提高了V浸出率；K⁺、SO₄^2-和Fe³⁺反应生成斜钾铁矾((KFe(SO₄)₂)沉淀，降低了Fe的浸出率，这是V与Fe有效分离的主要原因。因此，钒页岩氧压酸浸过程中适量添加K₂SO₄，不仅能提高V浸出率，而且能有效分离V与Fe，减少Fe对后续萃取工艺的不利影响。

关键词: 钒页岩, 氧压酸浸, K₂SO₄, 钒铁分离

Abstract: In order to explore the conditions of oxygen pressure acid leaching for a vanadium shale in Hubei,with K₂SO₄ as additive,the influence of K₂SO₄ dosage，concentration of sulfuric acid，oxygen partial pressure,leaching temperature，and leaching time on leaching rate of vanadium and iron are investigated respectively during the extraction of Vanadium from black shale by oxygen pressure acid leaching.The results showed that under the conditions of K₂SO₄ dosage 7%，the concentration of H₂SO₄ 15%，leaching temperature 190 ℃ for 5h at 2.0 MPa，the leaching rate of vanadium was 89.90% while the leaching rate of iron was only 5.73%.Obviously,the leaching rate of vanadium is increased,and the leaching rate of iron is greatly reduced compared with the tests without K₂SO₄.XRD phase and FTIR analysis showed that the addition of K₂SO₄ intensified the crystal structure destruction of mica which can promote the release of vanadium and increase its leaching rate.Yavapaiite sediment (KFe(SO₄)₂) formed by the reaction of K₊，SO²⁺₄ and Fe³⁺ reduces the leaching rate of iron,that is the main reason for separating vanadium and iron.Therefore，in the oxygen pressure acid leaching process of vanadium shale，the proper addition of K₂SO₄ can increase the leaching rate of vanadium，and also effectively separate Vanadium and Iron，and reduce the negatively effects of Fe on the subsequent extraction process.

Key words: Vanadium shale, Acid pressure oxidative leaching, Potassium sulfate, Separation of vanadium and iron

王露瑶, 张一敏, 黄晶, 刘涛, 薛楠楠. 钒页岩氧压酸浸过程中V与Fe的分离工艺研究[J]. 金属矿山, 2018, 47(01): 107-111.

WANG Lu-Yao, ZHANG Yi-Min, HUANG Jing, LIU Tao, XUE Nan-Nan. Separation Process of Vanadium and Iron during Oxygen Pressure Acid Leaching of Vanadium Shale[J]. Metal Mine, 2018, 47(01): 107-111.

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