复合微泡发生器装置的应用研究

发布时间：2018-03-23 09:13

本文选题：尾矿处理　切入点：浮选技术　出处：《昆明理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着有限矿物资源的不断开采,如何更有效地利用资源,从尾矿中选出仍有价值的矿物是人们一直在关注的问题。在尾矿处理方法中,常采用浮选法对其进行处理,但如何大量地产生符合浮选要求的微泡一直是浮选工艺的难题。针对矿物浮选难题,本文以浮选原理为依据,设计复合微泡发生器来满足尾矿浮选处理要求。首先介绍了浮选理论,概述了浮选法的发展历程与产生微泡的各种方法,分析了微泡的形成、微泡与矿粒粘附过程、微泡直径对矿物浮选的影响。对比了各种微泡发生器的发泡原理以及发泡性能优劣,选用旋流式微泡发生器与射流式微泡发生器组成复合微泡发生器,分别建立了射流式微泡发生器、旋流式微泡发生器和复合微泡发生器的内部流场模型,运用FLUENT软件进行仿真,获得了微泡发生器的速度云图、压力云图、湍动能云图及含气量图表。最后通过清水实验及对铁精矿尾矿的浮选实验,验证了复合微泡发生器的工作性能。通过建模仿真和实验得出,射流式微泡发生器输入端流速越大,吸气口负压值、喷出口含气量越大,当输入端流速为15m/s,气阀直径为1.2mm时,对该种铁精矿尾矿的浮选效果较好。
[Abstract]:With the continuous exploitation of limited mineral resources, how to use the resources more effectively and how to select the valuable minerals from the tailings is a problem that people have been paying close attention to all the time. In the tailings treatment, flotation is often used to treat them. However, how to produce a large number of microbubbles that meet the flotation requirements has always been a difficult problem in the flotation process. In view of the mineral flotation problem, this paper is based on the flotation principle. A composite microbubble generator was designed to meet the needs of tailings flotation. Firstly, the flotation theory was introduced, the development of flotation method and various methods of producing microbubbles were summarized, and the formation of microbubbles and the adhesion process between microbubbles and particles were analyzed. The influence of microbubble diameter on mineral flotation. The foaming principle and foaming performance of various kinds of microbubble generators are compared. A composite microbubble generator is composed of swirling microbubble generator and jet microbubble generator. The internal flow field models of jet microbubble generator, swirl microbubble generator and composite microbubble generator are established respectively. The velocity cloud diagram and pressure cloud diagram of the micro bubble generator are obtained by using FLUENT software. The turbulent kinetic energy cloud diagram and gas content chart. Finally, the working performance of the composite microbubble generator is verified by the experiments of clean water and flotation of iron concentrate tailings. Through modeling, simulation and experiment, it is found that the velocity of the jet micro bubble generator increases with the input end. When the inlet velocity is 15m / s and the valve diameter is 1.2mm, the flotation effect of the iron concentrate tailings is better.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD45

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