(1. 湖南大學 環(huán)境科學與工程學院，長沙 410082；
2. 浙江工商大學 環(huán)境科學與工程學院 浙江省固體廢物處理與資源化重點實驗室，杭州 310018；
3. 湖南大學 環(huán)境生物與控制教育部重點實驗室，長沙 410082)
摘 要: 研究NaOH與純堿添加量比例對氧化焙燒石煤中釩浸出率的影響。在最佳比例的浸出劑下，研究浸出溫度、時間和液固比對釩浸出的影響以及浸出液循環(huán)利用實驗。結(jié)果表明：在相對石煤質(zhì)量12%NaOH和4%純堿的浸出劑下，釩浸出率達到88.67%，比單獨使用12%的NaOH做浸出劑下釩的浸出率提高10%左右。在最佳質(zhì)量分數(shù)的浸出劑下，最佳工藝條件為：浸出液NaOH濃度為1.0 mol/L，純堿濃度為0.13 mol/L，浸出溫度為95 ℃，時間為3 h，液固比為3:1。浸出液經(jīng)固液分離后循環(huán)使用，第二次添加原有浸出劑用量的1/4，第三次添加原有浸出劑用量的1/2后，平均釩浸出率達83.40%，不僅降低了浸出劑用量，同時也提高了水資源的利用率。
關鍵字: 石煤；堿浸；焙燒；V2O5
（1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;
2. Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling,
College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China;
3. Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University,
Changsha 410082, China）
Abstract:The effect of the addition amount of NaOH and Na2CO3 on the leaching rate of vanadium from roasted stone coal was studied. With the optimal condition of leaching agent, the effects of leaching time, temperature and liquid to solid ratio on vanadium leaching rate and the leaching solution recycle experiment were studied. The results show that the leaching rate of vanadium is 88.67% under the condition of 12% NaOH and 4% Na2CO3 compared with the mass of stone coal, which is almost 10% higher than the leaching rate with NaOH 12% only in reaction system. The optimal technological conditions are that the NaOH concentration is 1.0 mol/L, the Na2CO3 concentration is 0.13 mol/L, the leaching temperature is 95 ℃, the leaching time is 3 h and the liquid to solid ratio is 3:1. The leaching agent was recycled to extract vanadium after solid-liquid separation. The average leaching rate is 83.40% when 1/4 of original leaching agent is added at the second time and 1/2 is added at the third time. The amount of the leaching agent is reduced and water efficiency is enhanced at the same time.
Key words: stone coal; alkaline leaching; roasting; V2O5
