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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (3): 440-448.doi: 10.11872/j.issn.1005-2518.2019.03.440

• Mining Technology and Mine Management • Previous Articles    

Study on the Optimal Concentration and Controlling Mode of Whole Tailings Flocculation Sedimentation

Ke JIANG1,2,3(),Ruihai KANG1,2,3,Zhongliang YAO1,2,3,Liang PENG1,2,3   

  1. 1. Changsha Institute of Mining Research Co. ,Ltd. ,Changsha 410012,Hunan,China
    2. National Engineering Resarch Center for Metal,Changsha 410012,Hunan,China
    3. State Key Laboratory of Safety Technology of Metal Mine,Changsha 410012,Hunan,China
  • Received:2018-07-24 Revised:2018-12-04 Online:2019-06-30 Published:2019-07-09

Abstract:

In case of a copper mine in Xinjiang,the overflow run muddy is serious,the tailings’ utilization ratio for fillings was low,this affects the efficiency of work cycle in mine,meanwhile,the processing costs of overflow remain high.Solving the settlement problem of tailings will lay a good foundation for the construction of environmental friendly and efficient mine.In order to solve the problem,this paper study the grain degree and surface shape of whole tailings,as well as slurry initial concentration.With the aid of laser diffraction particle size analyzer and electron microscope scanning,it is showed that the content of ultrafine tailings at -20 μm is 44.61%,and shape of the tailings are irregular,and the surface are rough.The gravity of fine tailings is difficult to overcome the sedimentation resistance,which is the main reason for the muddy overflow of vertical sand tank.The relationship formula of fitting between the tailings sedimentation height and time under the slurry initial concentration of 10%,15% and 20% were explored through experimentation.It was observed that the settlement curve of different concentrations showed a similar trend. The binding degree of tailings and polymeric flocculant chain is similar to that of receptor binding enzyme,so the Hill function is used to fit the sedimentation curve,the coefficient R 2 were all greater than 0.975.The fitting relationship indicates,under the same time T,the settlement height is proportional to the factor V max,inversely proportional to K and n.By useing the numerical analysis method,the relationship between slurry initial concentration and V maxKn were studied,to find the peak value of C-V maxC-k and C-n fitting curves.It was finally derived that the optimal slurry initial concentration value is 16% to 17%.Then compared the sedimentation test value with the predictive value by fitting equation under the condition that slurry initial concentration is 16.5%,the results prove that this method could well predict the optimal slurry initial concentration range for the flocculation sedimentation of the whole tailings.The above experimental research and analysis provide guidance for the field production.By increasing adjustment facility and interlock the parameters date in the filling station control system,to maintain the value of slurry concentration in the range of 16% to 17%,it matching the optimum additive amount of flocculant for the whole tailings in vertical sand tank.After this series of measures,the overflow of vertical sand tank will be clarified,the tailings’ utilization ratio for the fillings could be increased.

Key words: whole tailings, flocculation sedimentation, slurry initial concentration, fitting curve, parameters interlock

CLC Number: 

  • TD853

Fig.1

Mastersizer 3000 laser diffraction particle size analyzer"

Fig.2

Columnar section of full tailings size distribution"

Fig.3

Shape observation of the full tailings particle"

Fig.4

Correlation curve of settling velocity for tailings slurry with different concentration"

Fig.5

Fitting curve of settlement height and time of the whole tailings slurry with different concentration"

Table 1

Parameters of fitting equation by sedimentation height and settling time"

尾砂浆初始浓度% 系数V max 系数K 系数n R 2
10 27.58834±1.22666 10.64093±1.26562 1.13291±0.15072 0.97975
15 28.03261±1.31541 9.54856±1.21915 1.09351±0.15770 0.97647
20 27.82282±1.31139 9.65174±1.23200 1.10946±0.16168 0.97576

Fig.6

Fitting curve of slurry initial concentration C and the coefficient V max,K and n "

Table 2

Comparison of the sedimentation test value with the predictive value by fitting curve under the condition that slurry initial concentration is 16.5%"

时间T/s 预测值/cm 测试值/cm 时间T/s 预测值/cm 测试值/cm
0 3.0 3.0 20 19.5 20.2
2.5 5.3 6.4 30 21.9 23.5
5 9.3 9.5 60 24.8 25.3
7.5 12.3 11.8 90 25.8 25.8
10 14.4 13.9 120 26.4 26.3
15 17.5 16.5 180 27.0 26.7

Fig.7

Insufficiently dissolved flocculant solution"

Fig.8

Process chart of optimizing reagent system"

Fig.9

Facility adjustment for the slurry initial concentration and reagent mixing device"

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