2 edition of High density paste backfill found in the catalog.
High density paste backfill
Michael Keenan Murphy
|Statement||submitted by Michael K. Murphy|
|The Physical Object|
|Number of Pages||75|
Newer types of the viscometer system also measure the slurry density and calculate its composition. These systems have proven a success controlling backfill paste production plants. They offer it secure prevention of pipeline plugging and a production of high quality backfill pastes with a . Paste is defined as a non-segregating slurry that remains as a homogenous single-stage product during transport and placement. It is a high-density, engineered material. One distinguishing characteristic of paste is its particle size distribution (PSD). Paste contains at least wt% of.
Evaluation of Backfill Materials and Installation Methods for High Density February Polyethylene Pipe. 6. Performing Organization Code TECH 7. Author(s) 8. Performing Organization Report No. Priyantha W. Jayawichrama, Aruna L. Amarasiri, Pedro E. Region, M. Didarul A lam 9. Performing Organization Name and Address File Size: 9MB. Due to its exceptional performance, high-density unclassified tailing paste represents the future developmental direction of cemented tailing backfill as well as an inexorable trend in the promotion of “green mines” [1,2,3,4].In this regard, an appropriate evaluation of the consistency, flowability, and workability of cemented tailing backfill is crucial for determining the ease and Cited by:
Paste backfill behavior in a narrow vein mine: In situ stress and strain monitoring. In Proceedings of the 8th International Symposium on Mining with Backfill: Cited by: A paste system incorporates the full plant stream making use of the full PSD to impart various characteristics to the backfill and surface disposal. When a system is optimized for backfill, using the tailings produced by the mine is generally the most environmentally suitable means of disposal, but not necessarily the most cost effective method.
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Paste backfill is a pumpable, non-Newtonian and high density material made up of the mine tailings, water and cement. Due to the low operating costs involved and high strength acquisition compared.
   Basically, paste backfill is High density paste backfill book non-segregating, low-plasticity and high-density material consisting of thickened or filtered mine tailings to which binder and water are added to.
reduced costs for the backfill process. The results will be shown by examples from different mines. High density slurries are pumped over long distances.
At the Polish power plant of Belchatow flyashes are pumped over a distance of m. After more than 2 years of operation a Author: Peter Peschken, Dirk Hoevemeyer.
The addition of superplasticizers or high-range water reducers (HRWRs) to high density cemented paste backfills (CPBs) can improve their rheological behavior and facilitate pumping operations.
This study aimed to assess the influence of various mixture parameters, including HRWR type and dosage, binder type and content, as well as tailings characteristics on the rheological properties of CPB by: 5.
Landriault, D ‘Preparation and placement of high density backfill’, Underground Support Systems, CIMM Special Vol pp. Landriault, D & Goard, B‘Research into high density backfill placement methods by the Ontario Division of Inco Cited by: 1.
One of these approaches is the use of high-density paste backfill (HDPB) which is consisting mainly of a mix of solid particles (with the cement) and water, containing between 70% and 85% by dry weight of solids. The increased use of HDPB has improved the reliability, and has reduced the cost of the preparation and transportation systems.
Velocity Profile of Paste Flow in Pipe (based on Wingrove, ) Figure 4 is a plot of grain size distributions from a number of operations employing paste backfill.
It indicates that the minus 20m m fraction ranges from a low of 13% at the Lucky Friday Mine to a high of 68% at the Greens Creek Mine. The focus of this work has been to investigate the status of backfill technology, in particular paste backfill, a relatively new technology.
A rationale specifically for paste backfill system design has been developed. To date, a limited number of mines have implemented paste backfill systems. An extensive survey of backfill literature and a review of paste backfill operations in practice was Cited by: 1.
Paste backfill: Paste backfill is similar to surface paste deposition. The tailings are dewatered to generally >65% solids (by weight) and pumped underground, generally by positive displacement pumps. The paste has a homogenous appearance and produces a measurable slump (visible when released from a cone shaped slip mold (Abrams)).
Mine Backfill The design of deep level backfill distribution systems for hydraulic and paste backfill was revolutionized by Paterson & Cooke’s full flow design methodology.
Our expertise covers recipe formation, backfill production plants, pump and pipeline delivery systems through to stope placement. Paterson & Cooke continues to set the standard for backfill service by performing [ ]. The high rock stresses which result from deep mining operations can be relieved by backfilling.
Initially, waste rock was used to fill the openings left by mining operations, though with mixed results. The need to improve safety and reduce costs has prompted the mining industry to investigate alternative backfill Cited by: The hydration reaction in the binder requires a small proportion of water as well.
Consequently, percolation rate is not an important factor in cemented paste backfill. Solids Relative Density. Solids relative density is the ratio of the density of a unit volume of fill compared to the density of a unit volume of water.
For example, a backfill. Paste backfill is a highly complex material consisting of a mix of high-density mill tailings (72–85wt% solids, depending on grain size and specific gravity), binding agent to meet fill stability requirements, and water to transport the paste to the mine stope in the desired slump (Benzaazoua et al.
The paste is a granular material mixed. Underground mine backfilling is a form of ground improvement that has to be carried out in the mine sites. The backfilling provides ground support and regional stability, thus facilitating ore removal from nearby regions.
The large underground voids created by the ore removal are backfilled with the waste tailings in the form of paste fills, hydraulic fills, and by: Our projects include conventional surface deposition, submarine discharge (subsea or sub-lake), surface paste (high density tailings), cemented paste backfill (using the tailings for structural fill in underground mines), and dry stacking (surface disposal of filtered tailings).
In modern mining, waste material is often backfilled into underground voids or open pits after the precious minerals are extracted. Such backfill practice has been well adopted in various mining methods, i.e.
cut-and-fill (Henderson et al., ), sublevel opening stoping (Emad et al., ), and open pit mining (Lu et al., ).Backfill has proven to be an environmental-friendly, cost Cited by: • Paste can be "engineered" to provide the required strength for different parts of the mine.
The primary disadvantage is the high cost of using paste fill. The capital costs are high due to the plant requirements to de-water the tailings (usually using filters) and then to prepare a paste File Size: KB.
Paste fills typically have solids concentration greater than 70% by mass, contain binders and little or no water drains from the backfill after placement. This paper presents a rational design approach for backfill distribution systems by considering the backfill flow behaviour, pipe loop testing, distribution system type and backfill quality File Size: KB.
Tailings Slurry pipelines are commonly used to transfer mine residue from the processing plant to the tailings storage facility. Historically these pipelines were designed to operate at low solids concentrations, however as dewatering technology improved and solids concentrations increased, residue disposal systems have become significantly more complex.
Designing an effective residue and. Minerals GEHO® Hydraulic driven piston pumps First choice for paste pumping Open the catalog to page 1 Designed to pump high-density slurries, mine backfill, paste and sludges with solids up to 90% and mm particle size GEHO® paste pumps For more than 50 years we have been specialising in the design and development of some of the world’s.
The invention relates to a method and apparatus for producing high density slurry and paste backfills for use in mining operations and to associated backfill paste production facilities which incorporate the aforesaid method and apparatus. The high density slurry or paste is produced from a mill tailings mixture in a silo which includes a percolation/decant device for pecolating water out of Cited by: 3.A high density thickener produces thickened tailings.
The difference between a high rate and a high density thickener is the underflow will not segregate—that water remains bound into the mixture. A deep cone, or deep bed, thickener produces paste. Both high density and deep cone thickeners depend on retention time rather than area.Paste Backfill.
Paste backfill is a high density backfill (>70% solids depending on SG). In order to pump material at this density, a component of fines is required. As a general rule, the fines content (paste backfills is .