The magnetization intensity of some artificial suspensions while flocculating in a magnetic field
The magnetization intensity of some artificial suspensions while flocculating in a magnetic field
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DOI：
10.1111/j.1365-246x.1993.tb06990.x
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发表时间：
1993-09
影响因子：
2.8
通讯作者：
M. J. V. Vreumingen
中科院分区：
文献类型：
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作者：
M. J. V. Vreumingen
以高岭石或石英为非磁性组分，磁铁矿或磁铁矿为磁性组分的悬浮液在地磁场中絮凝时，磁化强度随时间的变化进行了测定。在不同的盐度范围内重复测量。对于所研究的所有成分，发现悬浮磁化的初始强度随低矿化度的升高而升高，然后在较高矿化度时下降到一个很低的值。对于所有的组成物，悬浮磁化强度随时间衰减的速率与盐度有关。完全沉降沉积物的磁化强度（DRM）总是比初始悬浮物的磁化强度弱得多，这在一定程度上又取决于盐度。结果表明，最终DRM的特征源于早在悬浮液中已经发生的（絮凝）过程，因此与沉降过程本身的关系不大。与我们的实验不同，在自然界中，絮凝体的形成通常涉及有机化合物，这些有机化合物起着粘合剂的作用。认为这种天然絮凝作用是造成天然DRM强度不饱和的主要原因。
SUMMARY The magnetization intensity of suspensions containing kaolinite or quartz as a non-magnetic fraction and maghemite or magnetite as a magnetic fraction, while flocculating in the geomagnetic field, was measured as a function of time. The measurements were repeated for a range of different salinities. For all compositions studied, it is found that the initial intensity of suspension magnetization rises with rising low salinity and then at some higher salinity falls to a very low value. For all compositions the intensity of suspension magnetization decays in time at a salinity-dependent rate. The magnetization (DRM) of the completely settled sediment is always much weaker than the magnetization of the initial suspension, to an extent which again depends on salinity. The results indicate that the characteristics of the ultimate DRM originate from (flocculation) processes which occurred already at an early instance in the suspensions, and consequently do not have much relationship with the sedimentation process itself. Different from our experiments, floc-formation in nature usually involves organic compounds which act as a glue. It is suggested that this natural flocculation is a major cause for the undersaturation of the intensity of natural DRM.