重介悬浮液在浓密旋流器中的浓密规律研究

发布时间：2019-02-12 07:40

【摘要】：重介分选是当前选矿的发展方向之一,重介选矿技术越来越多的被应用到矿石分选中。因此,需要对重介选矿技术进行深入的研究,尤其是重介质悬浮液的特性以及相关设备的研究。本文重点研究了硅铁重介悬浮液的特性,并对重介悬浮液在浓密旋流器中的浓密规律进行了深入的试验研究。本文研究了硅铁加重质粒度组成对重介悬浮液特性的影响作用,研究发现,当加重质D50越小时,重介悬浮液粘度越大,稳定性越好。但是加重质中的粗粒级(+0.074 mm)含量对重介悬浮液粘度有一定的影响,使得较小D50的加重质其重介悬浮液既有较小的粘度,又有较好的稳定性。在此基础上,本文对硅铁加重质和非磁性物(高岭土)配制的重介悬浮液特性也进行了试验研究。在当重介悬浮液粘度小于80 mPa·s时,对每种条件的重介悬浮液中非磁性物含量进行了探索,得到了不同试验条件下的非磁性物含量极限值。在不同入料悬浮液密度下,本文对浓密旋流器中重介悬浮液的浓密规律进行了探究。研究发现,浓密旋流器可以改善入料悬浮液的各项特性,较大程度提高了底流悬浮液的密度,同时可以获得低密度、低浓度和低磁性物含量的溢流悬浮液。结果表明,浓密旋流器溢流悬浮液粘度和稳定性均小于底流悬浮液粘度,且随着入料悬浮液密度的增大,底溢流悬浮液粘度和稳定性逐渐增大。当入料悬浮液密度从2.0 g/cm3增大到2.8 g/cm3时,浓密旋流器底溢流密度差逐渐减小;溢流悬浮液中非磁性物含量逐渐减小,底流悬浮液中非磁性物含量逐渐增大;溢流悬浮液中磁性物粒度逐渐增大,底流悬浮液中磁性物粒度逐渐减小。即随着入料悬浮液密度的增大,重介悬浮液在浓密旋流器中的浓密作用在逐渐减弱。本文对硅铁重介悬浮液特性和浓密旋流器浓密规律的研究结论,为重介选矿提供了一定的参考依据,同时也为后续研究开启了新方向。
[Abstract]:Heavy medium separation is one of the developing directions of mineral processing, and the technology of heavy medium separation is applied to ore separation more and more. Therefore, it is necessary to study the heavy medium mineral processing technology, especially the characteristics of heavy medium suspensions and related equipment. In this paper, the characteristics of heavy medium suspension of ferrosilicon are studied, and the thickening law of heavy medium suspension in dense cyclone is studied. In this paper, the effect of particle size composition of ferrosilicon on the properties of heavy medium suspension is studied. It is found that the higher the viscosity of heavy medium suspension is, the better the stability is. However, the content of coarse particle (0.074 mm) in the aggravation has a certain effect on the viscosity of the heavy medium suspension, which makes the weight medium suspension have both smaller viscosity and better stability. On this basis, the characteristics of heavy medium suspension prepared by ferrosilicon and nonmagnetic (kaolin) have also been studied experimentally. When the viscosity of heavy media suspension is less than 80 mPa s, the non-magnetic content of heavy media suspension under each condition is explored, and the limit value of nonmagnetic content under different test conditions is obtained. In this paper, the density law of heavy medium suspension in dense hydrocyclone is studied under different feed suspensions. It is found that the dense cyclone can improve the characteristics of the feed suspension, increase the density of the bottom flow suspension to a large extent, and at the same time obtain the overflow suspension with low density, low concentration and low magnetic content. The results show that the viscosity and stability of the overflow suspension of dense cyclone are lower than that of the bottom flow suspension, and the viscosity and stability of the bottom overflow suspension increase with the increase of the density of the feed suspension. When the density of feed suspension increased from 2. 0 g/cm3 to 2. 8 g/cm3, the density difference of bottom overflow decreased gradually, and the content of nonmagnetic substance in the suspension gradually decreased, and the content of non-magnetic in bottom-flow suspension gradually increased. The particle size of magnetic particles in overflow suspensions increases gradually, while that in bottom suspensions decreases gradually. That is, with the increase of the density of the feed suspension, the thickening effect of the heavy media suspension in the dense hydrocyclone is gradually weakened. In this paper, the conclusion of the study on the characteristics of heavy medium suspension and density law of dense hydrocyclone provides a certain reference basis for heavy medium ore dressing, and also opens a new direction for further study.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD455.7

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