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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (1): 105-111.doi: 10.11872/j.issn.1005-2518.2019.01.105

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Experimental Study on Sedimentation and Concentration of Unclassified Tailings

Xinzheng CHEN1,2,Lijie GUO1,2,*(),Wenchen LI1,2,Zongnan LI1,2   

  1. 1. BGRIMM Technology Group,Beijing 102628,China
    2. National Center for International Joint Research on Green Metal Mining,Beijing 102628,China
  • Received:2018-03-26 Revised:2018-06-23 Online:2019-02-28 Published:2019-03-19
  • Contact: Lijie GUO E-mail:ljguo264@126.com

Abstract:

Back filling method using unclassified tailings is an effective way to realize green mining of metal mines.Sedimentation and concentration of unclassified tailings is the key technology in the full tailings filling.With the improvement of mineral processing technology,the particle size of tailings gets smaller and smaller,which makes the sedimentation and concentration of tailings more difficult.Adding the flocculant to tailings slurry can greatly improve the sedimentation and concentration of tailings.The type of flocculant, the feeding concentration of tailings slurry and the dosage of flocculant added to tailings slurry are important factors that affect the flocculation and sedimentation efficiency of unclassified tailings,which are usually got from the sedimentation concentration test.Aiming at the problem of fine tailings being hard to concentrate in a domestic mine and using solid flux and bottom flow concentration as evaluation indicators,the sedimentation concentration test was carried out.Using the single factor analysis method,four experiments of the flocculant optimization,the optimal feeding concentration selection,the optimal flocculant unit consumption selection and the standard flocculation sedimentation were carried out in turn to get the parameters of flocculant type,feeding concentration and flocculant unit consumption with the best sedimentation and concentration effect.And the influence rules of feeding concentration and flocculant unit consumption on sedimentation and concentration of tailings was studied.The experiment process is simple and easy to operate,and the result is highly reliable.In the flocculant optimization experiment,four different types of anionic flocculant were chosen and they were domestic HJ63016、HJ70010、AL504 and French SNF6013S.In the optimal feeding concentration selection experiment,the concentration of tailings slurry is 6%,8%,10%,12%,14%,20%,25% and 30% respectively.In optimal flocculant unit consumption selection experiment,the flocculant unit consumption is 5,10,15,20,25,30 g/t.The results show that the optimum flocculant type is HJ70010,the optimum tailings slurry feeding concentration range is 10% ~ 12%,and the optimum flocculant dosage range is 10 ~ 15 g/t.When the tailings slurry feeding concentration is 12%,and the flocculant dosage is 15 g/t,the bottom flow concentration reached 64.4%,the sedimentation rate is 43.7 cm/min,and the solid flux is 3.43 t/(h?m2).With the increasing of feeding concentration,the solid flux increased first and then decreased with a parabolic change,and the bottom flow concentration increased first and then gradually stabilized.With the increasing of flocculant unit consumption,the solid flux increased first and then gradually stabilized,and the bottom flow concentration increased first and then decreased with a parabolic change.

Key words: unclassified tailings, sedimentation and concentration, solid flux, bottom flow concentration, feeding concentration, flocculant unit consumption

CLC Number: 

  • TD853

Table 1

Basic physical parameters of unclassified tailings"

参数数值参数数值
密度/(g·cm-33.19曲率系数Cc1.13
堆积密度/(g·cm-31.39-200目/%65.26
孔隙率/%56.5-400目/%49.81
不均匀系数Cu21.17

Fig.1

Particle size distribution curves of unclassified tailings"

Table 2

Results of flocculant preferred experiment"

絮凝剂

型号

质量浓度/%添加量/(g·t-1底流浓度/%沉降速率/(m·h-1固体通量/(t·h-1·m-2
HJ6301610205930.383.26
AL50410205729.843.20
SNF6013S10205729.813.17
HJ7001010205830.493.27

Fig.2

Change curves of height of solid-liquid separation interface with time(different flocculants)"

Fig.3

Bottom flow concentration and solid flux of each experiment with different flocculant type"

Table 3

Results of optimal feeding concentration selection experiment"

给料浓度/%絮凝剂添加量/(g·t-1底流浓度/%沉降速率/(m·h-1固体通量/(t·h-1·m-2
6205434.02.07
8205729.42.49
10205727.62.93
12206020.22.61
14206317.32.68
2020637.71.77
2520634.91.45
3020642.50.91

Fig.4

Change curves of height of solid-liquid separation interface with time(different feeding concentrations)"

Fig.5

Bottom flow concentration and solid flux of each experiment with different feeding concentration"

Table 4

Results of optimal flocculant dosage selection experiment"

编号絮凝剂添加量/(g·t-1料浆密度/%底流浓度/%沉降速率/(m·h-1固体通量/(t·h-1·m-2
15106423.542.53
210106624.982.62
315106229.413.12
420106130.963.31
525106230.743.26
630106132.003.40

Fig.6

Change curves of height of solid-liquid separation interface with time(different flocculant dosages)"

Fig.7

Bottom flow concentration and solid flux of each experiment with different flocculant dosage"

Table 5

Results of standard dynamic flocculation settlement test"

编号絮凝剂添加量/(g·t-1料浆密度/%底流浓度/%沉降速率/(m·h-1固体通量/(t·h-1·m-2
1#101064.1021.612.32
2#151063.8027.332.93
3#101265.5021.572.82
4#151264.4026.193.43

Fig.8

Change curves of height of solid-liquid separation interface with time of different tests"

Fig.9

Bottom flow concentration and solid flux of test 1# to 4#"

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