Evaluate how best to include in the tailings guide assessment and selection of both best available. The tailings storage facility tsf consists of the main tailings storage embankment, diversion ditches, tailing s discharge lines, reclaim barge and pipeline, seepage recovery system srs and. Cooke paterson and cooke consulting engineers pty ltd, south africa 1 introduction the design methodology for pipeline systems conveying thickened and paste tailings systems has been well developed over the last decade. This section is followed by 21 case studies illustrating the specific components of. High density slurry and paste tailings, transport systems saimm. Study of tailings management technologies mend report 2. High density slurry pipelines often operate at a higher pressure than conventional tailings, pipelines and pipeline mechanical design must take this into account. Safe tailings dam construction 19 gallivare 20010919 21 version.
Pilbara iron ores, as part of the design of tailings pipeline systems. Analyse and assess tailings equipment, resources, development and maintenance requirements, and cost implications. Table 2 iron ore tailings solids characterisation sample no. The shear strength of dry stack tailings will vary, depending on the moisture content and density of the tailings, and drainage conditions within the stack. Pipe length values are determined for the establishment depending on the distance between the tailing area and ore preparation facility.
When considering the design of a tailings storage facility there are many parameters which impact on the optimum site selected and the storage and tailings discharge methods used ritcey 1989. Mine paste backfillthe behaviour of thickened tailings and. Tailings pipelines for mine waste management ausenco. Planning, design, and analysis of tailings dams, by steven g. Approximately 90,000 t of magnetite will be produced during the design life of the project. Results of fullscale pipe test loop pumping tests by c. Thickened and paste tailings pipeline system design procedure part 1, page 3. An existing 1800m long pipeline which carried waste mica slurry from kaolin processing is to be recommissioned. Six pumps in series per pipeline deliver tailings via 450 mm diameter pipelines to the tailings dam. This means that these slurries will have higher pipeline pressure gradients than conventional tailings slurries and pump station discharge pressures may. Analyse and assess design criteria based on the specific legislation required. By using these guidelines, governments and industry are fostering the protection of the environment and human welfare in our region.
To some degree, the design of the retaining embankment is independent of the type of impoundment layout. New technologies on mine process tailing disposal 66 the height and diameter of the pumps to be used in the transmission line design. Tailings slurries are suspensions in water of the finegrained residues of the milling process by which raw materials are extracted from mined rock. The procedure usually adopted in such cases is to separate the tailing into coarse sand and fines in a classifier, and to use the coarse product to build up the wall. Hydraulic conveying, as an engineering solution to solids transport, has been.
Cooke xrepresentative process water should be used for the test work as the water chemistry can have a significant effect on the tailings flow behaviour. After settling and selfweight consolidation, the dry density of the undesiccated tailings is a function of the g s of the tailings solids. Slurrytailings pipeline design pipelines, piping and fluid. Introduction tsf design justification the tailings storage facility tsf design report presents an analysis of the background conditions and investigations undertaken. Appendix f1 tailings storage facility design report. Our solutions include gravity flow, open channel flow, energy dissipation, multiple pumps in series, and thickened paste disposal. Olympic dam expansion project tailings storage facility design report p 7 of 105 1 introduction 1. Conventional tailings facilities involve delivery, often in a pipeline, of unthickened or thickened slurry typically 20% to 40% solids content by weight, and up to 60% from the ore processing facility or. The particular design of these retaining structures is unique to a particular environment and mining operation.
This type of analysis is not the same as a conventional stress. Deposition of these slurries in ponds or lagoons, usually confined by manmade dams, can present serious safety and environmental risks, especially if there is inappropriate handling or management. For the sake of simplicity, pipeline designers have tended. Thickened and paste tailings pipeline systemsdesign procedure, part 2. The fine tailings slurry produced by the tailings thickeners will be transferred to the nominated itsf using centrifugal slurry pumps with variable frequency drives through a hdpe pipeline. This paper is the second in a series examining issues related to the design of paste and thickened tailings pipeline systems. The detailed design of a tailings delivery system to transport 118 000 td over 12 km in two 600 mm pipelines with two operating pump trains each equipped with four centrifugal pumps in series. The mica solids throughput is to be substantially increased from 5. The sequence followed for the hydraulic design of a paste or thickened tailings pipeline system is. Especially where you would have multiple piplines supported on sleepers or piperacks. At the lake shore the pipe will wye split into two parallel pipes, one of which. The coarser tailings may not be suitable for embankment construction and a downstream embankment may be required for these reasons.
Select the pipe diameter and trial pipe wall thickness considering deposition and laminar settling criteria cooke, 2006. Various pages within this website present a brief overview of the various surface and offshore tailings storage methods used today. Backer1 2 3 abstract this report presents the results of tests conducted by the u. Arguably modern slurry pipeline engineering began with the first major long. A combination of centrifuge and numerical modelling can form a powerful tool to enhance the design of safer and more economic dams. The successful design of a thickened or paste tailings system requires that the system is designed to accommodate the effect of the high density slurry on pumps, pipelines and the overall system operation.
Site selection is the most important aspect in affecting the tailings storage facility design. Mine tailings design basic requirements obey the laws of physics aka gravity and stability stuff happens earthquakes and other catastrophic events time will take its toll erosion and other long. If sufficient area is available close to the plant, by far the cheapest solution to tailings disposal is to pump the tailings from the thickener underflow to a pond or lagoon, where the solids can, over time, settle out to a dense saturated solid bed and the. Tailing disposal methods and tailings dam construction design.
The pyrite concentrate tailings and the general plant tailings will be combined at the plant and pumped to a nearby tailings storage facility tsf as slurry at a design solids content of 55% by mass. With expertise in complex hydraulics and tailings management, we tailor our solutions. A framework for a sustainable approach to mine tailings. Slurrytailings pipeline design porter mechanical op apr 06 12. Designing safe and stable tailings dam structures with. Jan 31, 2018 bonstrom et al gunnar mine tailings remediation plan water shedding cover system and landform design. Mine paste backfillthe behaviour of thickened tailings. The following sections relate to conventional surface tailings storage. This series of papers outlines the process for designing and implementing a typical surface tailings or underground backfill pipeline system. The following table summarizes the solids characterization of some of these samples. The project included the front end design of the 12. Analyse and assess design criteria in line with organisational specific waste management requirements, practices or processes. This report presents the feasibility level design of the tailings placement.
The design methodology for pipeline systems conveying thickened and paste tailings systems has been well developed over the last decade. Modified centreline raise of an tailings storage facility jon engels introduction. Wit transactions on information and communication technologies, vol 43. The detailed design and commissioning of a booster pump station to transport 35 000 td of kimberlite tailings to the storage facility. New tailings dams and waste rock dumps will be constructed, to encompass the increased. The volume of tailings is normally far in excess of the liberated resource, and the tailings often contain potentially hazardous contaminants. Before the 1960s, mine tailings were often disposed directly into ponds, lakes, rivers or natural topographic depressions, or stored in impoundments supported by earthen dams, without necessarily applying engineering principles mcleod et al.
The format of the design document varies, but will generally include the sections discussed below. Tailings dam construction design of slime is likely to slide and cause the dam to break away. It outlines the basis of the design and justifies the parameters adopted for the engineering design, construction, operation, rehabilitation and after closure of the tsf. The only considerations are costs associated with starter dyke and subsequent raised construction, the volume of material required to establish a particular height, the tailings properties and the water storage requirements of the facility. High density slurry and paste tailings, transport systems. This tailings corridor pipeline management plan outlines the design considerations and environmental and spill control measures for pipeline construction and operation. Does anyone have a good reference for the analysis of slurry or tailings pipelines. Best practices for tailings dam design klohn crippen. This is a pdf file of an unedited manuscript that has been accepted for publication. The first section provides the teadet with an overview on tailings and the issues that need to be addressed in all stages of the life cycle of railings. Slurrytailings pipeline design pipelines, piping and. As a service to our customers we are providing this early version of the manuscript. Conventional impoundment storage the current techniques. Pressure response to valve closure of downhill pipeline.
The function of the system is defined with a basic description of the process. Elghali et al investigation of the role of hardpans on the geochemical behavior of joutel mine tailings. Tailings will be produced as three separate tailings streams, pyrite concentrate 7. From a design standpoint, it is important to recognize that the density, moisture content, and drainage conditions within the stack are changing as more tailings are placed in the dry stack. Challenging economic conditions and increasingly strict environmental regulations demand tailings pipeline systems that travel longer distances, at higher concentrations and with longer design lives.
Pumping system design challenges for highdensity iron ore. Overall, the majority of the fine tailings slurry pipeline will be positioned. Hydraulic design issues high pipeline pressure gradients the exponential increase in yield stress and viscosity as solids, concentration increases is a common feature of high density systems. Slurrytailings pipeline design slurrytailings pipeline design porter mechanical op apr 06 12. A conventional impoundment is a surface retaining structure designed to store both tailings and mine water, with the aim of reclaiming the water for use in the processing plant as required. Bonstrom et al gunnar mine tailings remediation plan water shedding cover system and landform design. Vick, john wiley sons external link, new york, 1983, 369 p. Safety guidelines and good practices for tailings management. Request pdf mine paste backfillthe behaviour of thickened tailings and pipeline design tailings slurries are suspensions in water of the finegrained residues of the milling process by. Proceedings of the tenth international seminar on past and thickened tailings 15. Plot the hydraulic grade line for steady state operating conditions.
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