Helmholtz-Zentrum Dresden-Rossendorf (HZDR) Neutron imaging of froth structure and particle motion
Helmholtz-Zentrum Dresden-Rossendorf (HZDR) Neutron imaging of froth structure and particle motion
复制标题
亥姆霍兹德累斯顿罗森多夫中心 (HZDR) 泡沫结构和粒子运动的中子成像
DOI：
10.1016/j.mineng.2014.03.019
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发表时间：
2020
影响因子：
4.8
通讯作者：
K. Eckert
中科院分区：
文献类型：
--
作者：
S. Heitkam;M. Rudolph;T. Lappan;M. Sarma;S. Eckert;P. Trtik;Eberhard;Lehmann;P. Vontobel;K. Eckert
本文报道了用中子成像技术同时测量泡沫结构和附着粒子的方法。将含水泡沫样品置于PSI下的NEUTRA光束线中，可以在超过1Hz的帧速率下实现小于200μm的空间分辨率。强制排水装置允许控制泡沫的液体含量。中子的平均衰减被证明可以产生泡沫的液体部分。在泡沫中加入直径为200μm的疏水钆颗粒。使用两种表面活性剂，可获得不同程度的疏水性。根据排水流量和疏水性，颗粒以不同的速率从泡沫中被冲走。观察到粒子团的雪崩状运动。中子射线照相被证明可以对非定常泡沫浮选过程产生独特的见解。
This article reports on the simultaneous measurement of foam structure and attached particles employing neutron imaging. An aqueous foam sample is placed in the NEUTRA beamline at PSI, enabling a spatial resolution of less than 200μm to be achieved at a frame rate of more than 1Hz. A forced drainage setup allows the liquid content of the foam to be controlled. The averaged attenuation of the neutrons is demonstrated to yield the liquid fraction of the foam. Hydrophobized gadolinium particles with a diameter of 200μm are added to the foam. Using two surfactants, different levels of hydrophobicity are achieved. Depending on the drainage flow and the hydrophobicity, the particles are washed out of the foam at different rates. An avalanche-like motion of particle clusters is observed. Neutron radiography is demonstrated to yield unique insights into the unsteady froth flotation process.