Processes 2019 7 47 2 of 17 combined both methods and proposed the technology of cemented paste discharge of tailings CPDT 1011 . The method involved adding some cement to the tailings and discharging them to valleys or
Revision of U.S. air emission standards for phosphate tailings Federal Register: February 3 1999 Vol. 64 No. 22 p. 5573-5580 download full rule : 40 CFR Part 61 - National Emission Standard for Hazardous Air Pollutants
For conventional storage the tailings are generally discharged from spigots/outfalls lo ed along the embankment s of the facility. For surface thickened and paste storage the tailings are generally discharged from a central lo ion either through risers or from point sources that are raised over the life of the facility.
A typical phosphate mining operation can produce between 180000 and 225000 gallons per minute of fine phosphatic clay tailings. This material has a solids concentration of between 2% and 7% on a dry-solids basis. Currently ponds and lagoons are used for settling and clarifi ion of these materials.
The tailings storage facilities are the conventional place to store these tailings such as embankments dams dry stacking on surface land Wei et al. 2013; Reinaldo et al. 2016;Amoah et al
Tailings dry stacking for phosphate high popularity.Tailings.Info thickened tailings storage a discussion.The tailings are generally discharged from topographical high points within the tailings storage facility or by riser towers or central ramps icold and unep 2001 .
Surface Paste Tailings Disposal Paste tailings are defined as tailings that have been significantly dewatered to a point where they do not have a critical flow velocity when pumped do not segregate as they deposit and produce minimal if any bleed water when discharged from a pipe figure 1 .
Mine tailings are the finely ground residue from ore extraction. The grain size of the tailings depends on the nature of the ore and the milling process. Size measurements Robertson 1994 of tailings from four mines in Ontario
The tailings dry discharge is a new tailings processing process gradually emerging at home and abroad that is after the tailings slurry is concentrated in multiple stages and then processed by efficient dewatering equipment such as dewatering vibrating screen to form slag with small water content easy to precipitate solidify and be stacked.