摘要
针对目前含钒石煤焙烧效果差、钒浸出率低以及欠缺相关焙烧理论研究等问题,本文以湖北某地石煤原矿为对象,研究了石煤活化焙烧提钒过程中活化剂种类、用量、焙烧温度及时间对浸出率的影响,同时对石煤焙烧料进行X射线衍射、扫描电镜以及热力学分析。试验结果表明活化剂种类不同,石煤焙烧效果差别较大,其中添加硫酸钾焙烧对提高钒水浸率效果最为显著,同时焙烧温度和时间也是影响焙烧效果的主要因素;石煤在焙烧温度为950℃、时间为60 min及添加4%氯化钠和8%硫酸钾的条件下,钒水浸率为55.24%、总浸出率为70.02%;X射线衍射分析表明石煤通过添加硫酸钾活化焙烧,焙烧熟样中易生成钾钠长石和硬石膏,其抑制了钙长石的形成同时促进了水溶性钒酸盐的生成,从而提高了相应钒的水浸率;热力学分析表明石煤添加硫酸钾焙烧,焙烧熟样中硫酸钙的反应吉布斯自由能低于钙长石等矿物,同时钒酸三钠的生成吉布斯自由能亦小于其他种类钒酸盐。
The problems of poor roasting effect of stone coal, low leaching rate of vanadium and lack of related roasting theory for va- nadium extraction of stone coal collected from Hubei province by roasting with activators were studied. The effects of roasting activator, dosage consumptions of roasting activator, roasting temperature and time on vanadium recovery were investigated. Furthermore, the roasting stone coal was analyzed by using XRD, SEM and thermodynamics. The results showed that the roasting effect was observably different with using different kinds of activators. The water leaching rate of vanadium could significantly increase by using potassium sulfate as activator, furthermore, the roasting temperature and time were the main factors on roasting. The vanadium recovery of water leaching was 55.24% and the total one was 70.24% by roasting with 4% sodium chloride and 8% potassium sulfate at 950 ℃ for 60 min. The microcline and anhydrite appeared during roasting process with potassium sulfate, which restrained and decreased the genera- tion of anorthite and increased the water-soluble vanadate compound to enhance the water leaching rate of vanadium. The Gibbs energy of anhydrite was lower than that of anorthite. Similarly, the Gibbs energy of sodium vanadate was lower than others.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2013年第2期283-288,共6页
Chinese Journal of Rare Metals
基金
国家科技部"十二五"科技支撑计划重点项目(2011BAB05B01)
国家环保部公益性项目(201009013)资助
关键词
活化焙烧
硫酸钾
钒
石煤
机制
active wasting
potassium sulfate
vanadium
stone coal
mechanism
