Sludge recycling within cemented paste backfill: Study of the mechanical and leachability properties

Cemented paste backfill of sulphide-rich tailings: Importance of binder type and dosage

“…3). The importance of microstructure for the strength and stability of mortar and CPB has been highlighted in many studies [16,24,[30][31][32]. These studies have inferred that high strength and stability of mortar/CPB are generally concomitant with a compact or dense matrix as per the current findings in this study.…”

“…6a) would be expected to facilitate the ingress of moisture and air, and hence, the oxidation of pyrite present in CPB. In other words, the vulnerability of CPB to sulphate attack increases with an increase in porosity of CPB matrix [31,33]. Gypsum that forms as a potentially deleterious, secondary mineral phase via sulphate attack was identified in CPB matrix of OPC only as the binder (Fig.…”

Utilization of industrial waste products as pozzolanic material in cemented paste backfill of high sulphide mill tailings

“…This, in turn, alleviates the oxidation of pyrite present in CPB due to the likely mitigation of ingress of moist and air. The importance of microstructure for the strength and stability of mortar and CPB has been highlighted in many studies [11,13,[52][53][54].…”

Slurry Preparation Effects on the Cemented Phosphogypsum Backfill through an Orthogonal Experiment

“…As opposed to the SO 4 2− and F − varying with slurry preparation conditions, the concentrations of PO 4 3− always kept at very low levels at all experimental batches, which was likely due to the different solidification mechanisms of these ions. It is reported in previous studies that the PO 4 3− reacts rapidly with the large amounts of calcium in the alkaline environment, leading to the precipitation of dissolved PO 4 3− and thus a low concentration of PO 4 3− in the bleeding water [41,42]. At the same time, the EDS analysis revealed that the peaks of Ca, O and P were found, inferring the precipitation of calcium phosphate.…”