除钒尾渣短流程工艺制备高纯NH4VO3

金属矿山 ›› 2021, Vol. 50 ›› Issue (11): 211-214.

除钒尾渣短流程工艺制备高纯NH4VO3

刘景景

攀枝花学院钒钛学院，四川攀枝花 617000

出版日期:2021-11-15 发布日期:2021-12-16
基金资助:
四川省科学技术厅重点项目（编号：2019YFG0259）

High-purity NH4VO3 Preparation with Short Process Using Vanadium-removal Slag

LIU Jingjing

College of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, China

Online:2021-11-15 Published:2021-12-16

摘要/Abstract

摘要： 粗TiCl4除钒尾渣含钒2%~5%，具有较高的回收利用价值。为实现除钒尾渣中钒资源的低成本回收，提出了除钒尾渣直接焙烧—铵盐浸出—沉钒制备偏钒酸铵的新工艺，并开展了相关条件试验，重点考察了焙烧温度、NH4HCO3用量、浸出温度、浸出时间对提钒效果的影响。结果表明：①除钒尾渣在650 ℃下焙烧150 min，获得的焙烧样中主要物相有金红石型TiO2、锐钛型TiO2、Al2O3、V2O5和SiO2，钒氧化率达78.12%，可采用铵盐浸出实现钒的低成本提取。②条件试验确定焙烧样适宜的浸出条件为：NH4HCO3用量n(NH4+)/n(V)=2，液固比5 mL/g，浸出温度80 ℃，浸出时间30 min。在上述条件下，钒浸出率可达76.65%，浸出液V浓度为5.71 g/L。浸出液经4次循环浸出后，V浓度提高至19.66 g/L。该较高浓度的浸出液直接沉钒，获得了纯度＞99%的偏钒酸铵产品，满足标准一级品（YS/T 1022—2015）的要求，XRD分析进一步证实其具有较高的纯度。研究结果可为除钒尾渣中钒资源的短流程回收提供技术支撑。

关键词: 除钒尾渣, 短流程, 氧化焙烧, 铵盐浸出, 条件试验, 偏钒酸铵

Abstract: Vanadium-removal slags of crude TiCl4 contain vanadium of 2% to 5%, indicating high recycling value. In order to realize the low cost recovery of vanadium resources from vanadium-removal slag, a new process of direct roasting, ammonium salt leaching, precipitation of vanadium to prepare NH4VO3 from vanadium-removal slag was proposed. And the related conditions tests were carried out focusing on the effects of roasting temperature, NH4HCO3 dosage, leaching temperature and leaching time on vanadium extraction. The results showed that: ① After roasting at 650 ℃ for 150 min, the main phases of the roasting samples are rutile TiO2, anatase TiO2, Al2O3, V2O5 and SiO2, and the vanadium oxidation rate reaches 78.12%. The low- cost extraction of vanadium could be realized by ammonium salt leaching. ② The optimum leaching conditions of roasted samples were determined as follows: dosage of NH4HCO3 of n(NH4+)/n(V) =2, ratio of liquid to solid of 5 mL/g, leaching temperature of 80 ℃, leaching time of 30 min. Under the above conditions, the leaching rate of vanadium could reach 76.65%, and the concentration of vanadium of leaching solution is 5.71 g/L. After circulating leaching for four times, the concentration of vanadium increased to 19.66 g/L. The high concentration leaching solution could directly precipitates vanadium to obtain NH4VO3 product with purity above 99%, which meets the requirements of standard Grade I product (YS/T 1022—2015). XRD analysis further confirms that it has high purity. The research results can provide technical support for the short process recovery of vanadium resources from vanadium-removal slag.

Key words: vanadium-removal slag, short process, oxidizing roasting, ammonium salt leaching, condition test, NH4VO3

刘景景. 除钒尾渣短流程工艺制备高纯NH4VO3[J]. 金属矿山, 2021, 50(11): 211-214.

LIU Jingjing. High-purity NH4VO3 Preparation with Short Process Using Vanadium-removal Slag[J]. Metal Mine, 2021, 50(11): 211-214.

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