發(fā)布時(shí)間：2019-02-12 07:40

【摘要】：重介分選是當(dāng)前選礦的發(fā)展方向之一,重介選礦技術(shù)越來越多的被應(yīng)用到礦石分選中。因此,需要對(duì)重介選礦技術(shù)進(jìn)行深入的研究,尤其是重介質(zhì)懸浮液的特性以及相關(guān)設(shè)備的研究。本文重點(diǎn)研究了硅鐵重介懸浮液的特性,并對(duì)重介懸浮液在濃密旋流器中的濃密規(guī)律進(jìn)行了深入的試驗(yàn)研究。本文研究了硅鐵加重質(zhì)粒度組成對(duì)重介懸浮液特性的影響作用,研究發(fā)現(xiàn),當(dāng)加重質(zhì)D50越小時(shí),重介懸浮液粘度越大,穩(wěn)定性越好。但是加重質(zhì)中的粗粒級(jí)(+0.074 mm)含量對(duì)重介懸浮液粘度有一定的影響,使得較小D50的加重質(zhì)其重介懸浮液既有較小的粘度,又有較好的穩(wěn)定性。在此基礎(chǔ)上,本文對(duì)硅鐵加重質(zhì)和非磁性物(高嶺土)配制的重介懸浮液特性也進(jìn)行了試驗(yàn)研究。在當(dāng)重介懸浮液粘度小于80 mPa·s時(shí),對(duì)每種條件的重介懸浮液中非磁性物含量進(jìn)行了探索,得到了不同試驗(yàn)條件下的非磁性物含量極限值。在不同入料懸浮液密度下,本文對(duì)濃密旋流器中重介懸浮液的濃密規(guī)律進(jìn)行了探究。研究發(fā)現(xiàn),濃密旋流器可以改善入料懸浮液的各項(xiàng)特性,較大程度提高了底流懸浮液的密度,同時(shí)可以獲得低密度、低濃度和低磁性物含量的溢流懸浮液。結(jié)果表明,濃密旋流器溢流懸浮液粘度和穩(wěn)定性均小于底流懸浮液粘度,且隨著入料懸浮液密度的增大,底溢流懸浮液粘度和穩(wěn)定性逐漸增大。當(dāng)入料懸浮液密度從2.0 g/cm3增大到2.8 g/cm3時(shí),濃密旋流器底溢流密度差逐漸減小;溢流懸浮液中非磁性物含量逐漸減小,底流懸浮液中非磁性物含量逐漸增大;溢流懸浮液中磁性物粒度逐漸增大,底流懸浮液中磁性物粒度逐漸減小。即隨著入料懸浮液密度的增大,重介懸浮液在濃密旋流器中的濃密作用在逐漸減弱。本文對(duì)硅鐵重介懸浮液特性和濃密旋流器濃密規(guī)律的研究結(jié)論,為重介選礦提供了一定的參考依據(jù),同時(shí)也為后續(xù)研究開啟了新方向。
[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.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD455.7

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本文編號(hào)：2420217