(1. 北京科技大學 土木與環(huán)境工程學院，北京 100083；
2. 中國科學院 過程工程研究所 生化工程國家重點實驗室, 北京 100080)
摘 要: 采用流態(tài)化氧化焙燒方式預處理廣西某難浸高碳石煤以提高釩的浸出率，對氧化焙燒過程的熱力學和釩的氧化動力學進行了分析，并考察了流態(tài)化焙燒對釩浸出率的影響。結(jié)果表明：石煤在氧化焙燒過程中，碳、黃鐵礦的氧化反應在熱力學上比V(Ⅲ)氧化反應更易進行，它們的存在對釩氧化具有抑制作用。釩的氧化反應受擴散動力學控制，其表觀活化能為347.00 kJ/mol。釩浸出率隨焙燒溫度的增加先增加后減小，當焙燒溫度為700 ℃和750 ℃時，釩浸出率隨焙燒時間的延長而增加；當焙燒溫度為800 ℃，焙燒時間0.5 h時，釩浸出率最高，達97.51%，延長焙燒時間反而不利于釩浸出。與傳統(tǒng)的鈉化氧化焙燒法相比，浸出率高，環(huán)境污染少。
關(guān)鍵字: 釩；高碳石煤；流態(tài)化氧化焙燒；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
