Mechanism of Enhancing Extraction of Vanadium from Stone Coal by Roasting with MgO
Mechanism of Enhancing Extraction of Vanadium from Stone Coal by Roasting with MgO
复制标题
氧化镁焙烧强化石煤提钒机理
DOI：
10.3390/min7030033
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发表时间：
2017-02
期刊：
影响因子：
2.5
通讯作者：
Xue Nannan
中科院分区：
文献类型：
--
作者：
Chen Fang;Zhang Yimin;Huang Jing;Liu Tao;Xue Nannan
本文研究了石煤加MgO焙烧和硫酸浸出提钒工艺，并对加MgO焙烧石煤提钒的机理进行了分析。结果表明，在原矿中0 ~ 0.074 mm颗粒质量分数为75%，焙烧温度为500 °C，焙烧时间为1 h，MgO加入量为3 wt %，硫酸浓度为20 vol %，液固比为1.5 mL/g，浸出温度为95 °C的条件下，浸出时间为2 h，钒浸出率为86.63%，比空白焙烧提高了7.73%。机理分析表明，在500 °C以下，方解石分解程度较低，更容易生成钒酸镁。在硫酸浸出过程中，钒酸镁比钒酸钙更易溶解。因此，在500 °C以下使用MgO作为焙烧添加剂可以提高钒的浸出效率。高温下透闪石的形成会消耗方解石分解产生的氧化钙，阻碍了钒酸钙的形成，V2 O 5会与MgO反应生成钒酸镁。因此，高温下加MgO焙烧的钒浸出率高于空白焙烧。
In this paper, the extraction of vanadium from stone coal by roasting with MgO and leaching with sulfuric acid has been investigated, and the mechanism analysis of stone coal roasting with MgO was studied. The results indicated that under the conditions that the mass fraction of the particles with grain size of 0–0.074 mm in raw ore was 75%, the roasting temperature was 500 °C, the roasting time was 1 h, MgO addition was 3 wt %, the sulfuric acid concentration was 20 vol %, the liquid-to-solid ratio was 1.5 mL/g, the leaching temperature was 95 °C, and leaching time was 2 h, resulting in a vanadium leaching efficiency of 86.63%, which increased by 7.73% compared with that of blank roasting. The mechanism analysis showed that the degree of calcite decomposition was low and, thus, magnesium vanadate was more easily formed than calcium vanadate below 500 °C. Moreover, magnesium vanadate was easier to dissolve than calcium vanadate during the sulfuric acid leaching process. Thus, the vanadium leaching efficiency was enhanced by using MgO as a roasting additive below 500 °C. Additionally, at high temperature the formation of tremolite would consume calcium oxide produced from the decomposition of calcite, thus, the formation of calcium vanadate was hindered, and V2O5 would react with MgO to form magnesium vanadate. Therefore, the vanadium leaching efficiency of roasting with MgO was higher than that of blank roasting at high temperature.
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影响因子：
4.7
作者：
Guanghao Shang;Guiqing Zhang;Cong-jie Gao;Wen Fu;L. Zeng
通讯作者：
Guanghao Shang;Guiqing Zhang;Cong-jie Gao;Wen Fu;L. Zeng
DOI：
10.1007/s11663-015-0524-6
发表时间：
2016-02
期刊：
Metallurgical and Materials Transactions B
影响因子：
--
作者：
Nan-nan Xue;Yi-min Zhang;Tao Liu;Jing Huang
通讯作者：
Nan-nan Xue;Yi-min Zhang;Tao Liu;Jing Huang
DOI：
--
发表时间：
2006
期刊：
Hunan Nonferrous Metals
影响因子：
--
作者：
Bin Zhi-yong
通讯作者：
Bin Zhi-yong
DOI：
10.1002/chin.201637171
发表时间：
2016-08
期刊：
ChemInform
影响因子：
--
作者：
M. Skyllas-Kazacos;Liuyue Cao;M. Kazacos;N. Kausar;A. Mousa
通讯作者：
M. Skyllas-Kazacos;Liuyue Cao;M. Kazacos;N. Kausar;A. Mousa
影响因子：
--
作者：
Wang, Fei;Zhang, Yimin;Liu, Juan
通讯作者：
Liu, Juan