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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (5): 615-621.doi: 10.11872/j.issn.1005-2518.2018.05.615

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Study on Two-phase Flow Loop Test of High Concentration Backfill with Total Phosphorus Waste

Bing LIU1,2,Xibing LI1,2   

  1. 1 School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
    2 Hunan Provincial Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines，Changsha 410083，Hunan，China
  • Received:2018-07-25 Revised:2018-08-31 Online:2018-10-20 Published:2018-10-31

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Abstract:

In order to obtain the variation trend of frictional resistance in different concentration phospho-gypsum backfill slurry，the flow performance of the slurry was studied by shear rheological experiment and loop test.The results show that the frictional resistance of phosphogypsum backfill slurry increases multistep with the increase of concentration，and the higher the concentration，the faster the resistance increases.The research results show that under the condition of existing filling pipe network and filling ratio，displacement volume is less than 190 m3/h，frictional resistance change little with concentration of 50%~54%.Therefore，backfill slurry concentration can be raised to 54% for pipeline transportation，at this point the pipeline frictional resistance is around 0.2 kPa/m.In view of the complexity of mine backfill pipeline，the total resistance of transported backfill slurry will be increased，so the design of mine backfill system should make allowances for additional resistance due to the bend pipeline and slope.

Key words: phosphogypsum, backfill slurry, waste backfill, yield stress, frictional resistance, loop test

CLC Number: 

  • TD853

Fig.1

Shear rheological test of backfill slurry with different concentrations of phosphogypsum (modified according to reference ［6］)"

Fig.2

Average shear stress of backfill slurry with different concentrations of phosphogypsum"

Fig.3

Yield stress of phosphogypsum backfill slurry with different mass concentrations"

Fig.4

Loop test devices of phosphorusgypsum backfill slurry"

Fig.5

Frictional resistance of phosphogypsum backfill slurry at different velocities"

Fig.6

Average frictional resistance of phosphogypsum backfill slurry at different concentrations"

Fig.7

Calculated distance from primary pump station to phosphorusgypsum backfill station"

Fig.8

Frictional resistance of industrial test of phosphogypsum backfill slurry at different concentrations"

Fig.9

Total resistance of industrial test of phosphogypsum backfill slurry at different concentrations"

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