粗糙壁面螺旋溜槽中矿浆流场参数及颗粒分离行为演变特性

高淑玲; 周孝洪; 王乾; 刘文宝

doi:10.13779/j.cnki.issn1001-0076.2023.03.015

粗糙壁面螺旋溜槽中矿浆流场参数及颗粒分离行为演变特性

东北大学资源与土木工程学院，辽宁沈阳 110819

基金项目: 国家自然科学基金 (52274257；51974065)

详细信息

作者简介: 高淑玲（1980—），女，河北泊头人，副教授，博士生导师，主要从事复合力场分选过程强化与调控研究，E-mail：gaoshuling@mail.neu.edu.cn; 周孝洪（1995—），男，四川自贡人，东北大学2020级硕士研究生，2023级博士研究生。现就读于东北大学矿物加工工程专业，师从高淑玲副教授，主要从事螺旋溜槽流场仿真与调控研究。参与国家自然科学基金面上项目2项

通讯作者: 周孝洪（1995—），男，四川自贡人，硕士研究生，主要从事螺旋溜槽流场仿真与调控研究，E-mail：948455121@qq.com。

中图分类号: TD922

收稿日期: 2023-07-21

刊出日期: 2023-06-15

Evolution Characteristic of Slurry Flow Field Parameters and Particles Separation Behavior in Spirals with Rough Wall

School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, Liaoning, China

More Information

Corresponding author: ZHOU Xiaohong, 948455121@qq.com

Received Date: 21 July 2023

Publish Date: 15 June 2023

摘要

摘要:
借助于RNG k−ε湍流模型、VOF多相流模型及Eulerian Multi−fluid VOF模型对螺旋溜槽内的流场及颗粒运动行为进行数值模拟，系统考察了光滑壁面和粗糙壁面条件下的清水流场参数、赤铁矿−石英矿浆流场参数、颗粒分布、分离效率随过流圈数的演变特性。结果表明：相较于清水体系，矿浆流膜存在局部凸起，内缘区域的矿浆流体切向速度变大，中部和外缘矿浆流体的切向速度降低，其径向速度分布具有明显波动特性；与光滑壁面条件相比，粗糙壁面条件下的矿浆流膜凸起高度降低，矿浆切向速度整体偏高，内缘矿浆切向流速差异较小，内环流强度减弱，外环流强度增大；当流体纵向行程达到第3圈时，各流场参数径向分布的差异缩小并接近一致；相比于光滑壁面，粗糙壁面中的赤铁矿颗粒在内半槽的分布减少，随过流圈数增多向内迁移量增大，但在外缘最外微区的停留量也增大，石英颗粒则随流场演变逐渐在第3圈槽面中部区域形成较多分布；赤铁矿和石英的最大分离效率随过流圈数增多而升高且逐渐平衡，粗糙壁面条件下赤铁矿和石英的最大分离效率降低。本文研究范围内粗糙壁面对螺旋溜槽矿浆流场及颗粒分离行为影响显著，研究结果可以为螺旋溜槽壁面粗糙度设计及过程调控提供参考。
- 壁面粗糙度 /
- 螺旋溜槽 /
- 矿浆流 /
- 颗粒分布 /
- 分离效率
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.
- wall roughness /
- spirals /
- slurry flows /
- particle distribution /
- separation efficiency

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图 1 螺旋溜槽断面形状

Figure 1.

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图 2 螺旋溜槽计算域网格划分

Figure 2.

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图 3 螺旋溜槽滑块位置调整产物分割示意图

Figure 3.

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图 4 各圈末槽面中的流膜厚度径向分布

Figure 4.

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图 5 各圈末槽面中的流体微区平均切向速度径向分布

Figure 5.

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图 6 各圈末槽面中的内环流平均径向速度径向分布

Figure 6.

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图 7 各圈末槽面中的外环流平均径向速度径向分布

Figure 7.

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图 8 不同圈末槽面中的赤铁矿产率径向分布

Figure 8.

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图 9 不同圈末槽面中的石英产率径向分布

Figure 9.

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图 10 不同圈末槽面中赤铁矿和石英的分离效率

Figure 10.

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表 1 螺旋溜槽结构参数一览表

Table 1. List of Parameters for spiral separator Structure

结构参数数值

外半径（R） 200 mm
内半径（r₀） 50 mm
螺距（P） 240 mm
下斜角（γ） 12.81°
过流圈数 3.25

下载: 导出CSV

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