摘要
针对石煤提钒常压硫酸浸出能耗高、作业周期长的缺陷,提出石煤低温硫酸化焙烧矿物分解新工艺。以贵州凯里石煤为原料,对石煤低温硫酸化焙烧的时间、焙烧温度、硫酸加入量以及焙砂水浸工艺参数进行研究。结果表明:先对石煤进行低温硫酸化焙烧处理,再将焙砂按液固比1.2mL/g加水于100℃下搅拌浸出2h,钒的浸出率可达78.2%;而在相同酸矿比和固液比的条件下,采用常压直接酸浸石煤时,在100℃下搅拌浸出48h后,钒的浸出率只有67.8%。石煤通过低温硫酸化焙烧可有效强化矿物分解过程,缩短提钒作业周期,提高酸的利用率及钒的浸出率。
The new mineral decomposition process of vanadium recovery from stone coal by low temperature sulphating roasting was proposed, which overcomes the shortages of high energy consumption and long working cycle existing in stone coal decomposition with sulfuric acid solution under normal atmosphere. Using the stone coal obtained from Kaili of Guizhou Province, China, as raw material, the process parameters, such as roasting time, roasting temperature, sulfuric acid addition volume and the leaching with water for the calcine, were investigated. The results show that when the stone coal is firstly treated by low temperature sulphating roasting, then the obtained calcine is leached in water with liquid-to-solid ratio of 1.2 mL/g at 100 ℃ for 2 h, the leaching rate of vanadium is 78.2%. However, when the stone coal is leached with the same sulfuric acid addition and the same liquid-to-solid ratio under normal atmosphere at 100℃ for 48 h, the leaching rate of vanadium is only 67.8%. The process of low temperature sulphating roasting can effectively enhance the mineral decomposition of stone coal, which shortens the working cycle of vanadium recovery from stone coal and increases the utilization ratio of sulfuric acid and vanadium leaching rate.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2009年第5期943-948,共6页
The Chinese Journal of Nonferrous Metals
基金
贵州省发改委资助项目(贵州省铜仁地区钒资源开发与利用规划2007GH001)
关键词
钒
石煤
矿物分解
硫酸化焙烧
vanadium
stone coal
mineral decomposition
sulphating roasting
