含钒石煤矿中钒的氧化亚铁硫杆菌浸出工艺研究

Study on the Bioleaching Conditions of Vanadium from Vanadium-Bearing Stone Coal by Acidthiobacillus ferrooxidans

采用氧化亚铁硫杆菌浸出高硫含钒石煤矿中的钒,探索微生物浸出石煤矿中钒的可行性和最佳工艺条件。考察了矿物质量浓度、浸出温度、初始p H、振荡转速对钒浸出率的影响;在单因素实验基础上,运用Box-Behnken设计原理和响应曲面分析法对浸出温度、初始p H、振荡转速等工艺条件进行了优化。结果表明,氧化亚铁硫杆菌能够有效浸出石煤矿中的钒,最佳浸出条件为矿物质量浓度30 g/L、浸出温度32℃、初始p H=2.1、振荡转速147 r/min,在该条件下钒浸出率可以达到69.2%。

The bioleaching of vanadium from vanadium-bearing stone coal has been studied by using Acidthiobacillus ferrooxidans in order to determine the feasibility and optimal technological conditions. The influence of parameters such as pulp density, leaching temperature, initial pH and rotation speed on vanadium leaching efficiency was investigated. On the basis of single-factor experiments, the conditions including leaching temperature, initial pH and rotation speed for the bioleaching were optimized by using Box-Behnken Design （BBD） and Response Surface Methodology （RSM） . The results show that the leaching efficiency of vanadium could reach 69.2% , when the optimum conditions of the experiment were 30 g/L for pulp density, 32 ℃ for leaching temperature, initial pH value of 2. 1 and rotation speed of 147 r/min.