电场强化锰矿尾矿湿法浸出行为研究

Electric Field Intensified Leaching Process for Low-grade Manganese Ore

随着锰产业的迅锰发展,国内高品位锰矿逐渐枯竭,有必要探索锰矿尾矿资源化利用技术。实验采用电场强化锰矿尾矿的湿法浸出过程,并探索其强化机理。通过X射线衍射(XRD)、X射线荧光分析(XRF)、扫描电镜(SEM)以及紫外可见漫反射光谱(UV-vis DRS)等检测方法,分析了碳酸锰矿尾矿的结构和成分,以及浸出反应前后的物相变化行为,研究了强化浸出工艺条件。结果表明,电场可改变矿浆颗粒表面电荷分布,强化锰矿尾矿浸出过程。在电流密度为5 000 A/m2、液固比6∶1 m L/g、矿酸比为1∶0.7、温度为60℃、时间为1 h时,锰浸出率可达94.23%,与同等条件不加电场时相比提高18%,尾矿锰含量由4.33%降到0.14%。

Rapid development of manganese industry and the depletion of high-grade manganese resources made it increasingly important to develop processes for recovery manganese from low-grade manganese ore field intensification method was used to strengthen the acidic leaching process of manganese ore tailings. Electric tailings, and its strengthening mechanism and influence factors were explored. Phases of reaction system were analyzed to use XRD, XRF, SEM and UV-vis DRS. Results show that leaching process of manganese ore can be strengthened effectively when electric field was used. Under the optimum conditions, such as current density of 5 000 A/m^2, ore to acid ratio of 1 ： 0.7, liquid to solid ratio of 6：1 ml/g, leaching temperature of 60℃, leaching time of 1 h, the extraction rate of manganese reached 94.23%, increasing by 18% compared to the same conditions without electric field. The manganese content in ore powder was reduced from 4.33% to 0.14%.