基于流场分析的钨矿机械活化浸取设备性能研究
发布时间：2019-01-01 13:48
【摘要】：近年来,随着钨产品应用多样化和多元化,国内外对钨的需求量逐渐增加,由于国内高品位黑钨矿开采过度,导致钨资源面临缺乏,因此,国内主要开采利用含杂质量高、低品位白钨矿和混合矿资源,并大力回收尾矿以及钨废品等二次钨资源,然而传统浸出工艺浸出率低,耗时耗能,且严重浪费原料矿,而碱煮工艺是工业生产钨冶炼过程中重要工序,对于提高浸出效率、缩短钨矿浸出时间有很大影响,从而改善碱煮工艺流程具有深远的意义。当前,机械活化强化技术的运用,有效提高了钨浸出率、缩短浸出时间,本文在钨矿机械活化浸取设备实验样机基础上,结合赣州某钨冶炼公司提出的工艺过程要求,扩大设计该实验样机的反应容积,并运用CFD技术,模拟分析钨矿机械活化浸取设备搅拌釜内流场特性以及影响流场的因素,为优化设计该设备结构提供理论技术。本文应用FLUENT软件,对影响钨矿机械活化浸取设备搅拌釜内流场特性的结构参数进行了分析,得出了搅拌桨安装方式、离底高度、桨径比以及搅拌桨间转速比对流场的影响规律:四个搅拌桨呈120°均匀分布,搅拌釜内流场的轴流效果良好,利于过程强化。通过分析力矩和流场特性,建立了不同离底高度下流场特性的评判标准,得出了搅拌桨离底高度h在223mm~233mm之间时,有效降低了功率消耗,提高了釜内物料混合效率,强化效果达到最佳。搅拌桨直径与釜径的比值为0.136时,搅拌釜内流场轴流特性最佳,同时降低了功率消耗。周边搅拌桨与中间搅拌桨的转速比值为0.4时,增强了中间搅拌桨的搅拌强度,促进了物料强化浸出,节省了功率能耗。本文还针对钨矿机械活化浸取设备的碱煮过程,分析其工艺过程及其控制需求,根据工艺过程及控制需求,选定PLC为该设备的控制系统,并对其硬件进行选型:确定以西门子S7-200系列CPU226型的PLC、EM222输出模块、模拟量EM231输入/EM232输出模块为控制核心,提取系统需检测地状态,配置出对应的传感器和电磁阀。最后根据控制参数,完成I/O端口的分配和模块的选型。
[Abstract]:In recent years, with the diversification and diversification of the application of tungsten products, the domestic and foreign demand for tungsten gradually increased. Due to the excessive exploitation of high-grade wolframite in China, the tungsten resources are facing a shortage. The low grade scheelite and mixed ore resources, and the secondary tungsten resources such as tailings and tungsten waste products are recovered vigorously. However, the traditional leaching process has the advantages of low leaching rate, time consuming and energy consumption, and a serious waste of raw material ore. The alkali boiling process is an important process in the industrial production of tungsten smelting, which has a great impact on improving the leaching efficiency and shortening the leaching time of tungsten ore, thus improving the alkali cooking process has far-reaching significance. At present, the application of mechanical activation strengthening technology has effectively improved the leaching rate of tungsten and shortened the leaching time. Based on the experimental prototype of mechanical activation leaching equipment for tungsten ores, the paper combined with the technological process requirements of a tungsten smelting company in Ganzhou. The reaction volume of the experimental prototype was expanded, and the characteristics of the flow field and the factors affecting the flow field in the stirred kettle of mechanical activation leaching equipment for tungsten ore were simulated and analyzed by using CFD technology, which provided a theoretical technique for optimizing the structure of the equipment. In this paper, FLUENT software is used to analyze the structural parameters that affect the characteristics of flow field in stirred kettle of mechanical activated leaching equipment for tungsten ores. The installation mode of agitator is obtained, and the height from bottom to bottom is obtained. The effect of diameter ratio and rotor speed ratio on the flow field: the four impellers are distributed evenly with 120 掳, and the axial flow field in the stirred kettle has good effect, which is beneficial to the process strengthening. Based on the analysis of torque and flow field characteristics, the evaluation criteria of flow field characteristics at different bottom height are established. When the bottom height h is between 223mm~233mm, the power consumption is effectively reduced and the mixing efficiency of materials in the kettle is improved. The strengthening effect is the best. The ratio of impeller diameter to kettle diameter is 0.136, and the axial flow characteristics in agitator are the best, and the power consumption is reduced at the same time. When the ratio of rotating speed between peripheral and intermediate impellers is 0.4, the mixing strength of the impeller is enhanced, the material leaching is enhanced, and the power consumption is saved. This paper also analyzes the process and control requirements of the alkali boiling process of mechanical activation leaching equipment for tungsten ores. According to the process and control requirements, PLC is selected as the control system of the equipment. The hardware is selected as follows: the PLC,EM222 output module of Siemens S7-200 series CPU226 and the analog EM231 input / EM232 output module are selected as the control core to extract the ground state of the system and configure the corresponding sensors and solenoid valves. Finally, according to the control parameters, I / O port allocation and module selection are completed.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD45;TD954
本文编号：2397657
[Abstract]:In recent years, with the diversification and diversification of the application of tungsten products, the domestic and foreign demand for tungsten gradually increased. Due to the excessive exploitation of high-grade wolframite in China, the tungsten resources are facing a shortage. The low grade scheelite and mixed ore resources, and the secondary tungsten resources such as tailings and tungsten waste products are recovered vigorously. However, the traditional leaching process has the advantages of low leaching rate, time consuming and energy consumption, and a serious waste of raw material ore. The alkali boiling process is an important process in the industrial production of tungsten smelting, which has a great impact on improving the leaching efficiency and shortening the leaching time of tungsten ore, thus improving the alkali cooking process has far-reaching significance. At present, the application of mechanical activation strengthening technology has effectively improved the leaching rate of tungsten and shortened the leaching time. Based on the experimental prototype of mechanical activation leaching equipment for tungsten ores, the paper combined with the technological process requirements of a tungsten smelting company in Ganzhou. The reaction volume of the experimental prototype was expanded, and the characteristics of the flow field and the factors affecting the flow field in the stirred kettle of mechanical activation leaching equipment for tungsten ore were simulated and analyzed by using CFD technology, which provided a theoretical technique for optimizing the structure of the equipment. In this paper, FLUENT software is used to analyze the structural parameters that affect the characteristics of flow field in stirred kettle of mechanical activated leaching equipment for tungsten ores. The installation mode of agitator is obtained, and the height from bottom to bottom is obtained. The effect of diameter ratio and rotor speed ratio on the flow field: the four impellers are distributed evenly with 120 掳, and the axial flow field in the stirred kettle has good effect, which is beneficial to the process strengthening. Based on the analysis of torque and flow field characteristics, the evaluation criteria of flow field characteristics at different bottom height are established. When the bottom height h is between 223mm~233mm, the power consumption is effectively reduced and the mixing efficiency of materials in the kettle is improved. The strengthening effect is the best. The ratio of impeller diameter to kettle diameter is 0.136, and the axial flow characteristics in agitator are the best, and the power consumption is reduced at the same time. When the ratio of rotating speed between peripheral and intermediate impellers is 0.4, the mixing strength of the impeller is enhanced, the material leaching is enhanced, and the power consumption is saved. This paper also analyzes the process and control requirements of the alkali boiling process of mechanical activation leaching equipment for tungsten ores. According to the process and control requirements, PLC is selected as the control system of the equipment. The hardware is selected as follows: the PLC,EM222 output module of Siemens S7-200 series CPU226 and the analog EM231 input / EM232 output module are selected as the control core to extract the ground state of the system and configure the corresponding sensors and solenoid valves. Finally, according to the control parameters, I / O port allocation and module selection are completed.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD45;TD954
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