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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (1): 64-71.doi: 10.11872/j.issn.1005-2518.2022.01.124

• Mining Technology and Mine Management • Previous Articles     Next Articles

Study on the Effect of Physical Properties of Full Tailings on Flocculation and Sedimentation Performance

Zhaoyu LI1,2(),Wei SUN1,2(),Shengyou ZHANG1,2,Jinxin LI1,2   

  1. 1.Faculty of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
    2.Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space, Kunming 650093, Yunnan, China
  • Received:2021-09-06 Revised:2021-11-18 Online:2022-02-28 Published:2022-04-25
  • Contact: Wei SUN E-mail:845549050@qq.com;kmustsw@qq.com

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Abstract:

With the depletion of shallow mineral resources and the implementation of the national environmental protection policy，the filling mining method has gradually become the preferred mining method for major mines.In order to study the influence of the tailings own characteristics on the performance of flocculation and settlement during the filling process，the influence of the tailings own physical characteristics on the settlement effect was investigated by conducting flocculation and settlement experiments on four different tailings at the same feeding concentration，flocculant type and dosage.The experimental results and regression analysis show that the specific gravity，median particle size and -200 mesh particle content of the tailing sand are not mono-tonically correlated with the settling velocity and bottom flow concentration，and there is no simple univariate correlation between them，and the fitted equations are not well fitted by non-linear regression.The median particle size of the tailing sand show a positive correlation with the settling velocity and the bottom flow concentration.The -200 mesh particle content is negatively correlated with the settling velocity and bottom flow concentration in the process of flocculation and settling，and the fit is high，which has a higher degree of influence on the settling effect.The single-factor correlation of specific gravity of tailings，median particle size with settling velocity and bottom flow concentration is low，and the regression equation of these three factors with settling velocity and bottom flow concentration is obtained by multiple linear regression using SPSS software，and the significance of these factors is further analyzed.For the influence degree of flocculation settling velocity of tailings mortar，-200 mesh particle content > median particle size > proportion of the tailings.For the influence degree of tailings bottom flow concentration，median particle size >-200 mesh particle con-tent > proportion of the tailings.

Key words: flocculation sedimentation, median particle size, proportion of the tailings, granular composition, bottom flow concentration, sedimentation velocity, full tailings

CLC Number: 

  • TD853

Table 1

Physical properties of tailings"

尾砂

编号

检测结果
比重/（g·cm-3）中值粒径/μm-200目粒径含量/%
1号2.9113.04872.42
2号3.1122.40957.29
3号2.9312.64873.54
4号2.7917.37870.59

Fig.1

Grain composition of tailings"

Fig.2

Principle of flocculant bridging effect"

Fig.3

Schematic of flocculation and sedimentation test"

Fig.4

Variation law of solid-liquid interface height（a） and sedimentation velocity（b）with time"

Fig.5

Variation laws of average sedimentation velocity（a）and bottom flow concentration（b）with tailings proportion"

Fig.6

Effect of median particle size on average sedimentation rate（a）and bottom flow concentration（b）"

Fig.7

Effect of -200 mesh particle content on average sedimentation rate（a）and bottom flow concentration（b）"

Fig.8

Effect of particle size on settlement"

Table 2

Significant analysis of influencing factors in sedimentation velocity"

影响因素显著性
尾砂比重0.893
中值粒径0.859
-200目粒径含量0.386

Table 3

Significant analysis of influencing factors in bottom flow concentration"

影响因素显著性
尾砂比重0.753
中值粒径0.326
-200目粒径含量0.540
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