高海拔地区氰化提金生物氧化预处理过程氧化还原电位预估方法研究

项目名称： 高海拔地区氰化提金生物氧化预处理过程氧化还原电位预估方法研究

项目编号： No.61463047

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 其他

项目作者： 南新元

作者单位： 新疆大学

项目金额： 46万元

中文摘要： 生物氧化提金工艺作为21世纪最具竞争力和发展力的工艺之一，是生物冶金领域的研究热点。氧化还原电位(oxidation reduction potential, ORP)是该工艺预处理过程中的重要参数，更是影响高海拔地区该工艺控制和操作优化的主要因素。本课题针对高海拔地区氧化还原电位易受空气密度、昼夜温差等环境因素影响的问题，开展生物氧化预处理过程ORP预估方法的研究。主要内容包括（1）基于电化学和反应动力学原理，系统地研究生物与矿浆间的作用机理，提出高海拔地区ORP动力学建模方法；（2）应用有限元、时空有限体积法以及计算流体力学，分别建立氧化槽内不确定温度场分布模型和矿浆空气分布模型；（3）研究上述模型间关联关系，建立生物氧化预处理过程ORP动态预估模型及其参数优化算法。本课题成果对于提高高海拔地区生物氧化预处理工艺的处理效率、降低成本具有重要意义。

中文关键词： 高海拔；生物氧化预处理；氧化还原电位；动态预估

英文摘要： As one of the most competitive and developmental technology in the 21st century, biological oxidation of gold is a research hotspot in biological metallurgy. Oxidation reduction potential (ORP) is an important parameter of the biological oxidation pretreatment process in this technology. More critically, it is the main factor to affect the process control and operation optimization at high altitude. In high altitude area, there are characteristics of low pressure, small air density, and large temperature difference between day and night and so on. The influence of these characteristics to ORP can lead to hardly optimize the process control and operation parameters. In order to solve these problems, this project studies the ORP prediction methods of biological oxidation pretreatment process. First, the reaction mechanism between mineral and bacteria is studied and the kinetic model for ORP at high altitude is proposed based on electrochemistry and reaction kinetics. Then, the time-space finite volume method, finite element method and computational fluid mechanics are studied respectively. On this basis, the model of temperature field distribution in oxidation tank and the model of air distribution in ore pulp are established. Finally, the relationships among the above models are analyzed, and the ORP dynamic prediction model of the biological oxidation pretreatment process and the optimization method of its parameters are studied. The proposed methods and models are verified by experimental simulation and industrial application analysis. The research is significant to improve efficiency and reduce production cost in biological oxidation pretreatment process at high altitude.

英文关键词： high altitude;bio-oxidation pretreatment;oxidation reduction potential(ORP);dynamic prediction