(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 100080)
摘 要: 采用流态化氧化焙烧方式预处理广西某难浸高碳石煤以提高钒的浸出率，对氧化焙烧过程的热力学和钒的氧化动力学进行了分析，并考察了流态化焙烧对钒浸出率的影响。结果表明：石煤在氧化焙烧过程中，碳、黄铁矿的氧化反应在热力学上比V(Ⅲ)氧化反应更易进行，它们的存在对钒氧化具有抑制作用。钒的氧化反应受扩散动力学控制，其表观活化能为347.00 kJ/mol。钒浸出率随焙烧温度的增加先增加后减小，当焙烧温度为700 ℃和750 ℃时，钒浸出率随焙烧时间的延长而增加；当焙烧温度为800 ℃，焙烧时间0.5 h时，钒浸出率最高，达97.51%，延长焙烧时间反而不利于钒浸出。与传统的钠化氧化焙烧法相比，浸出率高，环境污染少。
关键字: 钒；高碳石煤；流态化氧化焙烧；活化能
high-carbon stone coal fluidized through oxidizing roasting
（1. School of Civil and Environmental Engineering, University of Science and Technology Beijing,
Beijing 100083, China;
2. National Key Laboratory of Biochemical Engineering, Institute of Process Engineering,
Chinese Academy of Science, Beijing 100080, China）
Abstract:In order to enhance the leaching rate of vanadium, the fluidized oxidizing roasting was adopted to pretreat the high-carbon stone coal from Guangxi province, China. The thermodynamics of oxidizing roasting process and the oxidation kinetics of vanadium were analyzed, and the effect of fluidized roasting conditions on leaching rate of vanadium was investigated. The results indicate that the oxidation reaction of carbon and pyrite occurs more easily than that of V(Ⅲ) during the roasting process. Therefore, the vanadium oxidation reaction is inhibited by the existence of carbon and pyrite. The vanadium oxidation reaction is controlled by diffusion kinetics and the apparent activation energy is 347.00 kJ /mol. As the roasting temperature increases, the leaching rate of vanadium firstly increases and then decreases. Under roasting temperatures of 700 ℃ and 750 ℃，the leaching rate increases with the extension of roasting time. The leaching rate of vanadium reaches its maximum value (97.51%) under the roasting conditions of 800 ℃ and 0.5 h, the extension of roasting time (＞0.5 h) was not favorable for vanadium leaching. Compared with the traditional salt roasting method, the technique has the characteristics of high leaching rate and more environment safety.
Key words: vanadium; high-carbon stone coal; fluidized oxidizing roasting; activation energy
