| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
GAO Shuling, ZHOU Xiaohong, WANG Qian, LIU Wenbao. Evolution Characteristic of Slurry Flow Field Parameters and Particles Separation Behavior in Spirals with Rough Wall[J]. Conservation and Utilization of Mineral Resources, 2023, 43(3): 127-136. doi: 10.13779/j.cnki.issn1001-0076.2023.03.015
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Evolution Characteristic of Slurry Flow Field Parameters and Particles Separation Behavior in Spirals with Rough Wall
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Abstract
Using RNG k−ε turbulence model, VOF multiphase flow model and Eulerian Multi−fluid VOF model, the flow field and particle motion behavior in spirals were numerically simulated. The evolution characteristics of water flow field parameters, hematite−quartz slurry flow field parameters, particle distribution and separation efficiency with the turn number of fluid flows through the trough under conditions of smooth wall as well as rough wall were systematically investigated. It was shown that in comparison to the water system, local bulges were observed in the slurry flow film, accompanied by an increase in the tangential velocity of the slurry fluid in the inner edge region and a decrease in the tangential velocity at the middle and outer edges. The radial velocity distribution exhibited noticeable fluctuation characteristics. Compared to the condition of smooth wall, that of rough wall resulted in a reduction of bulges height of the slurry flow film. Additionally, the tangential velocity of the slurry was generally higher, and the difference in tangential velocity at the inner edge of the slurry was smaller. The intensity of the internal circulation weakened while the intensity of the external circulation strengthened. When the longitudinal path of the fluid reached the third turn, the radial distribution difference of flow field parameters were reduced and became similar. Compared with the condition of smooth wall, the distribution of hematite particles decreased in the inner half trough under the condition of rough wall , and the inward migration amount increased with the turn number of fluid flows through the trough, but the amount of stay in the outermost micro−region of the outer edge also increased. Quartz particles formed more distribution in the middle area of the trough of the third turn gradually with the flow field evolution. The maximum separation efficiency of hematite and quartz increased with the turn number of fluid flows through the trough and achieved balance gradually. The maximum separation efficiency of hematite and quartz decreased under the condition of rough wall. It is found that rough wall affected the slurry flow field and particles separation behavior of spirals significantly within the scope of this research, which could provide a reference for the wall roughness design and process control of spirals.
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Keywords:
- wall roughness /
- spirals /
- slurry flows /
- particle distribution /
- separation efficiency
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References
[1] 王国法, 任世华, 庞义辉, 等. 我国智能绿色矿业发展战略研究[J]. 煤炭经济研究, 2021, 41(12): 4−10. WANG G F, REN S H, PANG Y H, et al. Research on development strategy of intelligent green mining industry in China[J]. Coal Economic Research, 2021, 41(12): 4−10. [2] 寿嘉华. 走绿色矿业之路——西部大开发矿产资源发展战略思考[J]. 中国地质, 2000(12): 2−3+6. SHOU J H. Taking the road of green mining − strategic thinking on the development of mineral resources in the western development[J]. Geology in China 2000(12): 2−3+6. [3] 伍伟, 尹琼, 任卓隽, 等. 国内外绿色矿业发展历程及策略[J]. 现代矿业, 2021, 37(2): 1−4. doi: 10.3969/j.issn.1674-6082.2021.02.001 WU W, YIN Q, REN Z J, et al. The development hhistory and strategy of green mining at home and abroad[J]. Modern Mining, 2021, 37(2): 1−4. doi: 10.3969/j.issn.1674-6082.2021.02.001 [4] 陆占国. 强化鞍山式赤铁矿分级−重选工艺试验研究[C]//第二十三届辽鲁冀晋粤川京七省市金属学会矿业学术交流会论文集. 辽宁省金属学会、山东金属学会、河北省冶金学会、等, 2016: 167−170. LU Z G. Research on improving the classification−gravity separation technology for Anshan−type hematite ore[C]// Proceedings of the 23rd Liaoning, Shandong, Hebei, Shanxi, Guangdong, Sichuan, and Beijing Metallurgical Society Mining Academic Exchange Conference. Liaoning Province Society for Metals、Shandong Society for Metals、Metallurgy of Hebei Province、 et al, 2016: 167−170. [5] 刘惠中, 吴华冬. 螺旋选矿设备的应用现状及展望[J]. 有色金属(选矿部分), 2022(5): 151−158. LIU H Z, WU H D. Application and prospect of spiral concentrator[J]. Nonferrous Metals(Mineral Processing Section), 2022(5): 151−158. [6] SIVRIKAYA O. Cleaning study of a low−rank lignite with DMS, Reichert spiral and flotation[J]. Fuel, 2014, 119: 252−258. doi: 10.1016/j.fuel.2013.11.061 [7] 沈新春, 古吉汉, 黄云松. 螺旋选矿设备在钨选矿中的应用研究现状[J]. 矿山机械, 2017, 45(10): 44−49. doi: 10.3969/j.issn.1001-3954.2017.10.012 SHEN X C, GU J H, HUANG Y S. Research status on application of spiral dressing equipments in tungsten ore beneficiation[J]. Mining & Processing Equipment, 2017, 45(10): 44−49. doi: 10.3969/j.issn.1001-3954.2017.10.012 [8] 马崇振, 张华, 梁汉. 螺旋溜槽发展现状及在海滨砂矿中的应用实践[J]. 湖南有色金属, 2020, 36(1): 18−22. doi: 10.3969/j.issn.1003-5540.2020.01.006 MA C Z, ZHANG H, LIANG H. Current situation of spiral chute and its application in beach placer[J]. Hunan Nonferrous Metals, 2020, 36(1): 18−22. doi: 10.3969/j.issn.1003-5540.2020.01.006 [9] DAVIES P O J, GOODMAN R H, DESCHAMPS J A. Recent developments in spiral design, construction and application[J]. Minerals Engineering, 1991, 4(3-4): 437−456. doi: 10.1016/0892-6875(91)90146-M [10] ROMEIJN T, BEHRENS M, PAUL G, et al. Experimental analysis of water and slurry flows in gravity−driven helical mineral separators[J]. Powder Technology, 2022, 405: 117538. doi: 10.1016/j.powtec.2022.117538 [11] KAYA F, KARAGOZ I, AVCI A. Effects of Surface Roughness on the Performance of Tangential Inlet Cyclone Separators[J]. Aerosol Science and Technology, 2011, 45(8): 988−995. doi: 10.1080/02786826.2011.574174 [12] ZHAO Q, CUI B Y, HOU D X, et al. Effects of wall roughness on the separation performance of hydrocyclones under different inlet conditions[J]. Industrial & Engineering Chemistry Research, 2021, 60(30): 11251−11266. [13] ZHOU F Q, SUN G G, ZHANG Y M, et al. Experimental and CFD study on the effects of surface roughness on cyclone performance[J]. Separation and Purification Technology, 2018, 193: 175−183. doi: 10.1016/j.seppur.2017.11.017 [14] DEHDARINEJAD E, BAYAREH M. Impact of non−uniform surface roughness on the erosion rate and performance of a cyclone separator[J]. Chemical Engineering Science, 2022, 249: 117351. doi: 10.1016/j.ces.2021.117351 [15] ARNOLD D J, STOKES Y M, GREEN J E F. Thin−film flow in helically wound shallow channels of arbitrary cross−sectional shape[J]. Physics of Fluids, 2017, 29(1): 013102. doi: 10.1063/1.4973670 [16] 王书礼, 王磊, 初福栋, 等. 一种鱼鳞状槽面的螺旋溜槽: CN202121485750.4[P]. 2021−11−23. WANG S L, WANG L, CHU F D, et al. A spirals with a fish scale shaped groove surface: CN202121485750.4[P]. 2021−11−23. [17] M. A. DOHEIM, A. F. ABDEL GAWAD, G. M. A. MAHRAN, et al. Numerical simulation of particulate−flow in spiral separators: Part I. Low solids concentration (0.3% & 3% solids)[J]. Applied Mathematical Modelling, 2013, 37(1/2): 198−215. [18] G. M. A MAHRAN, M. A DOHEIM, A. F. ABDEL GAWAD, et al. Numerical simulation of particulate−flow in spiral separators (15 % solids)[J]. Afinidad:Revista de Quimica Teorica y Aplicada, 2015, 72(571): 223−229. [19] YE G C, LIU Q X, MA L Q, et al. CFD−DEM investigation of fluid and particle motion behaviors in initial stage of spiral separation process at low solids concentration[J]. Mineral Processing and Extractive Metallurgy Review, 2022: 1−6. [20] WANG J H, LUO J, HUANG S X, et al. Numerical simulation of single aluminum droplet evaporation based on VOF method[J]. Case Studies in Thermal Engineering, 2022, 34: 102008. doi: 10.1016/j.csite.2022.102008 [21] HUO J L, WANG Z, LUAN X Y, et al. The CFD modeling of bund overtopping phenomena and prediction of dynamic pressure on the bund[J]. Journal of Loss Prevention in the Process Industries, 2022, 74: 104653. doi: 10.1016/j.jlp.2021.104653 [22] MENG L G, GAO S L, WEI D Z, et al. Particulate flow modelling in a spiral separator by using the Eulerian multi−fluid VOF approach[J]. International Journal of Mining Science and Technology, 2023, 33(2): 251−263. doi: 10.1016/j.ijmst.2022.09.016 [23] PATTANAPOL W, WAKES S J, HILTON M J, et al. Modeling of surface roughness for flow over a complex vegetated surface[J]. 2007, 26: 273−281. . [24] CEBECI T, BRADSHAW P. Momentum Transfer in Boundary Layers[M]. Hemisphere Pub. Corp, 1977. [25] MISHRA B K, TRIPATHY A. A preliminary study of particle separation in spiral concentrators using DEM[J]. International Journal of Mineral Processing, 2010, 94(3/4): 192−195. -
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GAO Shuling, ZHOU Xiaohong, WANG Qian, LIU Wenbao. Evolution Characteristic of Slurry Flow Field Parameters and Particles Separation Behavior in Spirals with Rough Wall[J]. Conservation and Utilization of Mineral Resources, 2023, 43(3): 127-136. doi: 10.13779/j.cnki.issn1001-0076.2023.03.015
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Figure 1.
Cross sectional drawing of spirals
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Figure 2.
Mesh division of the computational domain of spirals
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Figure 3.
Schematic of product segmentation when adjusting the spirals splitter position
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Figure 4.
Radial distribution of flow film thickness in each turn’s end trough surface
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Figure 5.
Radial distribution of average tangential velocity of fluid microregions in each turn’s end trough surface
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Figure 6.
Radial distribution of average radial velocity of internal circulation flow in each turn’s end trough surface
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Figure 7.
Radial distribution of average radial velocity of outer circulation flow in each turn’s end trough surface
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Figure 8.
Radial distribution of hematite yield in the end trough of different turns
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Figure 9.
Radial distribution of quartz yield in the end trough of different turns
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Figure 10.
Separation efficiency of hematite and quartz in the end trough of different turns