振动填料辅助介质对微粉填充过程影响的实验研究

对矿石成分做光谱分析时需将矿粉紧实地填充到实验碳棒中，为增强填充效果，本文提出添加辅助介质的二维振动填料法对微粉进行填充，运用离散单元法建立微粉力学接触模型，通过EDEM软件构建微粉颗粒模型并对填充过程进行仿真模拟。选用玛瑙球作为辅助介质，在参考振动填料法主要参数（振动频率和振动时间）的基础上，利用仿真模型模拟了颗粒尺寸为50~150 μm矿粉微粒混合物的填充过程（填充空腔体积1 cm3），其中振动频率为60~80 Hz，振动时间为10~15 s；分析了振动频率、振动时间等影响因素对微粉填充率和填充密度的影响规律，并采用自制实验台对仿真模型进行了振动填料实验验证。结果表明:加入辅助介质的振动填料填充紧实，填充质量可满足实验需要，为其他粉体填料提供借鉴和参考。

Experimental study on the effect of vibrating filler auxiliary medium on micro powder filling process

In the spectral analysis experiments of ore composition, the ore powders should be tightly filled into the test carbon rod. To enhance the filling effect of micro powders, the two-dimensional vibrating filler method added by auxiliary medium was introduced for filling and compacting. The mechanical contact model of micro-powders was established by discrete element method, and the particle model of micro-powders was constructed and simulation by EDEM software. By considering the main parameters of vibration packing (vibration frequency and vibration time), the two-dimensional vibrating filling process of the mixture ore powders in the particle sizes of 50~150 μm was simulated by using agate ball as the auxiliary medium in the cavity volume of 1 cm3, when the vibration frequency was 60~80 Hz and the vibration time was 10~15 s; the influencing factors of vibration frequency and vibration time on the filling rate and packing density of micro-powders were analyzed and discussed; finally, the simulation was verified by vibratory packing experiment in the self-made table. The results show that the filling material is compacted in two-dimensional vibrating filler method added by auxiliary medium, and the filling quality can meet the test requirements. The validity of simulation model is verified by experiment, providing a reference for other powder fillers.