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Study on strength development of cemented backfill of Lead Zinc Sulfide Tailings

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Document pages: 8 pages

Abstract: The development of unconfined compressive strength (UCS) of cemented filling material for Lead-Zinc Sulfide Tailings was studied. The results show that the UCS of cemented backfill with ordinary portland cement (OPC) as binder will decrease in the later stage of solidification regardless of the particle size. Under the same conditions, the higher the OPC content, the higher the UCS of cemented backfill, the longer the curing time, and the UCS of cemented backfill begins to decrease. Under the same conditions, the finer the tailings, the lower the UCS of cemented backfill at each age, and the UCS of cemented backfill begins to decrease in the early stage of solidification. X-ray diffraction analysis (XRD) shows that the UCS of cemented backfill is reduced by Bdy was related to the formation of an expansive substance (expansive gypsum) in the cemented backfill body, which led to the cracking of the test sample. In the cemented backfill materials of coarse tailings of lead-zinc mine, the composite binder formed by OPC and calcined kaolin (CK) containing metakaolin was used; the amount of calcium hydroxide, the hydration product of cement, was reduced or eliminated due to the pozzolanic reaction of metakaolin; and the amount of expansive gypsum was reduced or eliminated, so the UCS of the cemented backfill body increased within 360 days of curing.

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