Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第7期    总第160期    2012年7月

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文章编号:1004-0609(2012)07-2052-09
循环流态化焙烧−加压浸出从极难浸石煤中提取钒
冯雅丽1,蔡震雷1,李浩然2,汪  平1,刘欣伟1,杨志超1

(1. 北京科技大学 土木与环境工程学院, 北京 100083;
2. 中国科学院 过程工程研究所 生化工程国家重点实验室, 北京 100190
)

摘 要: 以广西某极难浸石煤钒矿为研究对象,研究循环流态化焙烧试样在加压浸出条件下的钒浸出率。结果表明:在相同酸浸条件下,循环流态化空白焙烧试样的钒浸出率高于钠化焙烧的钒浸出率。系统的焙烧−浸出工艺对比研究表明:该石煤钒矿只有在循环流态化焙烧并加压高浓度酸浸作用下才能获得最高的钒浸出率,应属于极难浸石煤钒矿。在V(H2SO4):V(HF)=1:1和MnO2添加量(质量分数)为3%的条件下,循环流态化空白焙烧矿的最佳酸浸条件为液固比1:1、浸出温度150 ℃、浸出时间6 h,钒浸出率可达98.11%。同时,研究循环流态化空白焙烧矿加压浸出的动力学模型、浸出控制步骤及表观活化能。循环流态化空白焙烧能避免钠化焙烧产生的Cl2及HCl等有害气体的排放问题。从焙烧反应设备的创新应用着手,探索试验工艺条件,为极难浸石煤钒矿的工业化利用提供参考和依据。

 

关键字: 极难浸石煤钒矿;循环流态化焙烧;加压浸出;动力学模型

Extraction of vanadium from hardest refractory stone coal using recirculating fluidized roasting and pressure leaching technology
FENG Ya-li1, CAI Zhen-lei1, LI Hao-ran2, WANG Ping1, LIU Xin-wei1, YANG Zhi-chao1

1. School of Civil and Environmental Engineering, University of Science and Technology Beijing,
Beijing 100083, China;
 2. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences,
Beijing 100190, China

Abstract:Based on the hardest refractory stone coal containing vanadium from Guangxi, China, the leaching rate of vanadium under the condition of recirculating fluidized roasting and pressure leaching was studied. The results indicate that the leaching rate of vanadium of blank fluidized roasting is higher than that of the sodium treated one under the same acid-leaching condition. The systematic technical comparative research on roasting and leaching indicates that this stone coal is indeed the hardest refractory one because the mineral can only obtain the highest leaching rate of vanadium if it is treated by recirculating fluidized roasting and pressure leaching. Under the condition that the volume ratio of H2SO4 to HF is 1:1 and the mass fraction of MnO2 addition is 3%, the best acid leaching requirement of the recirculating fluidized blank roasting sample is that the ratio of liquid to solid is 1:1, the leaching temperature is 150 ℃, and the leaching time is 6 h. The leaching rate of vanadium can be up to 98.11%. Meanwhile, the pressure leaching kinetic model, the leaching control step and the leaching apparent activation energy of the recirculating fluidized blank roasting sample were studied. The discharging problem of harmful gas like Cl2 and HCl from sodium treated roasting can be avoided by using recirculating fluidized blank roasting. Based on the innovational application of the roasting reaction device, the exploration of experimental techniques will provide some references and judgments for the industrial utilization of the hardest refractory stone coal.

 

Key words: hardest refractory stone coal containing vanadium; recirculating fluidized roasting; pressure leaching; kinetic model

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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