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Performance comparison and mechanism analysis of neutralization tailings and flotation tailings used for filling mixture

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Document pages: 8 pages

Abstract: Using BIOX neutralization tailings and flotation tailings of Jinfeng mine, underground filling comparative tests of different tailings were carried out. The laboratory comparison test results show that when the cement dosage is 19 , the backfill UCS after 7 days, 14 days and 28 days are 105 – 163 , 80 – 102 and 33 – 43 respectively, which is higher than that of flotation tailings. When the cement dosage is 12 , the backfill UCS after 7 days, 14 days and 28 days are 58 – 77 , 50 – 60 and 28 – 51 respectively, which is higher than that of flotation tailings. The pulp fluidity of neutralization tailings is lower than that of flotation tailings, and the difference between slump and diffusivity is less than 6 , which is not a significant differenceant difference in slurry fluidity. The reason for neutralized tailings showing higher UCS is as follows: during backfill curing, neutralization tailings produce abundant crystals of CaSO4·2H2O in interlaced structure which helps in combining aggregates closely; CaSO4·2H2O hydrates with C3A C4AF contained in the cement and forms clavate cement bacillus which works as a micro reinforcing steel bar. The test proved that neutralized tailings are more optimal for backfilling.

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