Use of CFD-DEM Coupling to Determine the Settling Hindered Velocities for Highly Concentrated Mining Slurries

使用 CFD-DEM 耦合确定高浓度矿浆的沉降阻碍速度

• 批准号: 518283-2017
• 负责人: EinMozaffari, Farhad
• 金额: $ 1.82万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=639897
• 关键词: Use; CFD; DEM; Coupling; Determine

Mixing of highly concentrated slurries is a critical operation in mining industry. The hindered settling velocitymust be considered when a solid-liquid mixer is designed for these suspensions. However, due to the inherentcomplexity of these systems, there is no specific data that provides the actual settling rate of these solidparticles in a hindered settling environment.Currently, Hayward Gordon designs mixing systems for mining slurries by using the settling velocity of asingle particle instead of the hindered settling velocity. This inaccurate approach can lead to oversizeddimensioning of the vessel, inappropriate selection of impeller type, size and rotational speed, low energyefficiency and operation difficulties. Therefore, Hayward Gordon is interested in obtaining better insights intothe particle settling process in a hindered environment to refine and optimize their mixing design andmanufacturing. Thus, the main objective of the proposed research project is to obtain the hindered settlingvelocity in highly concentrated mining slurries as a function of the solid concentration, solid density andparticle size through the coupled computational fluid dynamics (CFD) and discrete element method (DEM).The selection of the correct models is crucial in CFD-DEM coupling.This work is of great importance to the mining industry of Canada. The research results will lead to the designof efficient mixing systems for the suspension of highly concentrated slurries. The Canadian mining industryand mining equipment manufacturers can implement the CFD-DEM approach to assess many scenarios on acomputer without the additional costs of constructing and testing prototype models. This leads to an improvedequipment design, a more reliable process monitoring, a more efficient use of power, a decreased maintenanceand operational cost and finally an increased capital cost saving. Thus, the proposed research will contribute tothe increased economic activity of the Canadian mining industry, and will impact our society, quality of lifeand environment.

高度浓缩的浆液的混合是采矿业的关键操作。当为这些悬浮液设计固体液体混合器时，请考虑阻碍的沉降速度。但是，由于这些系统的固有复杂性，没有特定的数据可以在受阻的沉降环境中提供这些固体粒子的实际沉降速率。目前，海沃德·戈登（Hayward Gordon）设计混合系统用于采矿泥浆的混合系统，通过使用asingle粒子的沉降速度而不是阻碍定位速度。这种不准确的方法可以导致容器的过度限制，不适当选择叶轮类型，尺寸和旋转速度，低能效和操作困难。因此，海沃德·戈登（Hayward Gordon）有兴趣在阻碍环境中获得更好的粒子沉降过程，以完善和优化其混合设计和制造。因此，拟议的研究项目的主要目标是通过耦合的计算流体动力学（CFD）和离散的元素方法（DEM）获得高度浓缩的采矿泥浆中的阻碍沉降性，固体浓度，固体密度和粒子大小的函数。研究结果将导致设计有效混合系统，以悬浮高度浓缩的浆液。加拿大采矿业和采矿设备制造商可以实施CFD-DEM方法来评估ACOMPUTER的许多方案，而无需构建和测试原型模型的额外成本。这导致了改进的设备设计，更可靠的流程监控，更有效地使用电力，降低了维护的运营成本，并最终节省了资本成本。因此，拟议的研究将贡献加拿大矿业行业的经济活动的增加，并将影响我们的社会，生命环境的质量。