Efficient Separation of Silicon and Vanadium by Sodium Roasting-Water Leaching from Vanadium Slag and CaV2O6 Preparation

被引：13

作者：

Li, Changqing ^{[1
]}

Zhang, Haichao ^{[1
]}

Tao, Ma ^{[1
]}

Wang, Xufeng ^{[1
]}

Li, Hang ^{[1
]}

Li, Yungang ^{[1
]}

Tian, Ying ^{[1
]}

机构：

[1] North China Univ Sci & Technol, Coll Met & Energy, Minist Educ Modern Met Technol, Key Lab, 21 Bohai Rd, Caofeidian Xincheng 063210, Tangshan, Peoples R China

来源：

CRYSTALS | 2021年 / 11卷 / 03期

基金：

中国国家自然科学基金;

关键词：

separate; vanadium slag; calcium vanadate; sodium roasting; kinetics; MICROSTRUCTURE; MECHANISM; CHROMIUM;

D O I：

10.3390/cryst11030255

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Calcium vanadate (CaV2O6), a new product of vanadium precipitation, was obtained from vanadium slag by sodium roasting-water leaching and calcium precipitation. The separation behavior of vanadium and silicon in vanadium slag during sodium roasting and water leaching was systematically studied, and micro-morphology and valence migration behavior of vanadium and Fe in vanadium slag, roasting slag, and residue were revealed. The Na2CO3 was added to the vanadium slag at 20% mass fraction, roasted at 790 degrees C, and kept for 120 min, the roasted sample was added to the deionized aqueous solution with a liquid-solid ratio of (L/S) 5mL/g, and then heated at 90 degrees C for 60 min, 89.54% vanadium and 1.96% chromium were extracted. Sodium carbonate tends to combine with vanadium to form sodium vanadate, while silicon is easy to combine with Fe and Na to form acmite (NaFeSi2O6). When the molar ratio of N (Ca/V) is 0.6 and CaO, is added to adjust the pH of vanadium leaching solution to 6.7 +/- 0.1 and precipitate 90 min at 90 degrees C, vanadium is precipitated in the form of CaV2O6 with a purity of 95.69%, under these conditions, the precipitation ratio is 95.03%.

引用

页码：1 / 21

页数：21

共 21 条

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