Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings最新文献

{"title":"Towards prediction of cake detachment in tailings filtration","authors":"Bernd Fränkle, P. Morsch, Hermann Nischl","doi":"10.36487/acg_repo/2115_03","DOIUrl":"https://doi.org/10.36487/acg_repo/2115_03","url":null,"abstract":"By offering an opportunity to fulfil environmental and process water recovery specifications, filtration of tailings has received increasing attention. In the process, complete cake detachment is required to maintain high throughputs. Incomplete discharge represents a bottleneck in the process. Therefore, a deeper understanding of cake detachment behaviour is a key to success. Experimental studies on adhesion forces between filter cake and cloth are a first step towards detachment prediction. Filtrations using an FLSmidth lab filter press and subsequent adhesion measurements with iron ore tailings and two different filter media show the influence of filtration pressure on adhesion.","PeriodicalId":410057,"journal":{"name":"Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131529523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Steel wire reinforced composite polyethylene pipe: the new technology for paste reticulation","authors":"R. Pearce, M. Revell","doi":"10.36487/acg_repo/2115_24","DOIUrl":"https://doi.org/10.36487/acg_repo/2115_24","url":null,"abstract":"Since the introduction of paste backfill into underground mining operations in the 1990s, transport of paste underground has been primarily completed using steel pipes. Steel pipes have been required due to the relatively high friction loss of the thick paste material and therefore the moderately high operating pressures realised through the piping system. Steel pipes are both heavy and rigid which results in them being labour intensive to install in the underground environment. In most other underground mine applications high density polyethylene pipe (HDPE) is used, however its use in paste backfill is limited due to the low maximum allowable operating pressures (MAOP) of HDPE. To overcome the short comings of steel and HDPE pipe for paste fill transport, a new technology known as steel wire reinforced composite polyethylene pipe (SRCP) is now becoming widely used. SRCP pipe technology provides the high pressure benefits of steel piping, along with the low weight, corrosion resistance and flexibility properties of HDPE. This paper outlines the history of SRCP, the products details, how SRCP is used in a modern paste fill system and a number of case studies of its use in Australian and African underground mining operations.","PeriodicalId":410057,"journal":{"name":"Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134429050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paste thickeners in India’s iron and steel industry","authors":"Jerold Johnson, Bhagabati Misra","doi":"10.36487/acg_repo/2115_14","DOIUrl":"https://doi.org/10.36487/acg_repo/2115_14","url":null,"abstract":"Iron production in India has seen rapid growth over the last few years, significantly exceeding forecasts. This growth has accentuated several issues regarding management of the slimes, dewatering, and tailings storage facilities (TSF). The number of slime pelletising beneficiation plants has increased to produce pellets for domestic use and exports. Pellet plants vary in size from 1 to more than 8 Mtpa pellet production. Slime beneficiation can produce tailings with more than 90% passing 20 microns (µm). In light of recent world iron tailings disasters, there has been a focus on much lower risk tailings storage systems. Plants have significant obstacles to overcome in the management of these slime tailings; the tailings’ very fine particle size distribution (PSD) is notorious for poor filtration rates, small TSF areas are available, stream variability can greatly affect dewatering efficiency, and water management at the TSF in high rainfall, to name a few. Paste thickener technology, which provides solutions to several of these challenges, has entered the Indian iron market. The first installation was in 2015 at Shri Bajrang Power and Ispat Ltd Tilda pellet plant. This paper features additional Indian paste thickener sites, discussing dewatering variable feed streams, thickener operation and results, and methods of TSF management.","PeriodicalId":410057,"journal":{"name":"Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127392928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of inhomogeneous properties of backfill samples to explore a new quantitative criterion for cemented paste backfill identification","authors":"Xiaopeng Peng, Li Jie Guo, Guangsheng Liu, Xiaocong Yang, C. Wan","doi":"10.36487/acg_repo/2115_28","DOIUrl":"https://doi.org/10.36487/acg_repo/2115_28","url":null,"abstract":"Cemented paste backfill (CPB) has been utilised globally in mines based on its benefits of non-segregation, non-bleeding and homogeneity. Due to a lack of research around the mechanism(s) driving anti-segregation properties, nowadays only some engineering empirical parameters including the slump or the fine particle content of backfill slurries can be used as the descriptive criterion for CPB. To better understand the anti-segregation mechanism of CPB, so a quantitative criterion for its identification can be determined, the segregation-induced inhomogeneous properties of cemented tailings backfill have been experimentally investigated. Samples (diameter 75 mm and height 150 mm) with different solid contents were poured, cured and cut into sections of equal height. Thereafter, titration measures of EDTA-2Na and helium porosimeter have been used respectively to test the cement content and porosity of each section. Results show that the cement contents decreased from top to bottom along the curing height of samples, while the porosities increased along the settling direction. The inhomogeneity of cemented samples is affected obviously by the solids content of the paste, and it is notable that there is a turning point for the slurry concentration value over which the homogeneity will be improved dramatically. The turning point could be used as a new criterion for CPB definition from the perspective of inhomogeneity inhibition.","PeriodicalId":410057,"journal":{"name":"Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124440703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The balance between energy and water preservation in the deposition of dry tailings in wet climates","authors":"J. Kruyswijk","doi":"10.36487/acg_repo/2115_13","DOIUrl":"https://doi.org/10.36487/acg_repo/2115_13","url":null,"abstract":"In the past two decades, the mining industry has become more interested in ‘dry’ tailings. The improved water recovery and potential operational cost benefits have been described by several authors. Compared with conventional tailings disposal, increasing the level of dewatering improves water preservation without having a major impact on operational costs. Dry tailings deposition is a method whereby in the deposition of the tailings, no free water is released. Ultimately, there are two varieties of dry tailings: paste tailings and filtered tailings. Paste tailings are dewatered to the maximum saturated density, whereas filtered tailings are mechanically dewatered to an unsaturated state. Saturated, loose, contractant tailings are susceptible to liquefaction; the primary mode of failure in most catastrophic tailings storage facility (TSF) failures. Consequently, well-compacted filtered tailings are increasingly considered for risk control. The prerequisite for long-term stability is that the filtered tailings remain unsaturated over time and are in a dense state. This condition may not be met in wet or seasonally wet conditions. When saturation of the tailings may occur, TSF design must make accommodations for sufficient drainage and containment of the stored tailings. Under these conditions, the key differentiator between paste and filtered tailings is the approximate 10% extra water recovery. The improved water recovery comes at the expense of a significant increase in power and fuel consumption. In circumstances where the increased spend on the latter two energy sources is offset by the value of the reclaimed water, it may be justifiable to consider the application of filtered tailings. From a sustainability point of view, the increased CO 2 emissions will also have to be taken into consideration when selecting the preferred dry tailings deposition method. In this paper, it is demonstrated that in given applications the balance between energy consumption, water preservation, and CO 2 emissions favours paste tailings deposition.","PeriodicalId":410057,"journal":{"name":"Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116983469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Operational optimisation of a tailings storage facility based on statistical analysis of historical monitoring records","authors":"I. Ezama, Santiago pastine, J. Pinheiro","doi":"10.36487/acg_repo/2115_26","DOIUrl":"https://doi.org/10.36487/acg_repo/2115_26","url":null,"abstract":"Operational control and trigger action response plans for tailings storage facilities (TSFs) routinely measure a number of operational aspects to assess risk and ensure the TSF does not exceed certain design considerations. Measurements that are routinely used for this purpose include topographical surveys and beacon settlements, density and moisture measurements, and discharge characteristics, among others. A statistical analysis of the cumulative historical operational datasets from a TSF allows improved knowledge of the level of variability of the considered parameters, and potentially enhances risk-based decision-making by increasing the understanding of uncertainties and the potential for expected deviations during operations (ICMM 2021). The inclusion of a probabilistic dataset in the design inputs allows a performance-based approach to managing a TSF, considering a series of scenarios defined by performance objectives, determining key factors to identify them in a timely manner, and incorporating effective corrective or ‘failure’ control measurements, that can be improved with sequential forecasts of the TSF behaviour. This approach was undertaken to optimise the deposition strategy of the Cerro Vanguardia TSF and expand its life-of-mine (LOM), allowing for tighter construction planning and deferral of construction by several years. This had considerable benefits during the current COVID-19 contingency. Statistical analysis of ongoing operational monitoring data was adequately incorporated into operational design optimisation and to select an adequate level of risk tolerance based on an ‘as low as reasonably practical’ (ALARP) perspective. Performance-based scenarios were identified and plans for timely decision-making were established to forecast reasonable economical/financial planning, and a probability-based events selection to trigger timely operational adjustments.","PeriodicalId":410057,"journal":{"name":"Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121747971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The geomechanics of thickened and paste tailings","authors":"K. Seddon","doi":"10.36487/acg_repo/2115_18","DOIUrl":"https://doi.org/10.36487/acg_repo/2115_18","url":null,"abstract":"The overall objective of thickened and paste tailings disposal has been stated many times: it is to thicken a tailings slurry to the point where it is non-segregating, and will beach to form a sloping, sub-aerial deposit. The advantages of this type of scheme have been stated to include higher density, higher strength (including avoidance of a slimes pond), improved seismic resistance, and better closure and rehabilitation prospects (including lower compressibility). The aim of this paper is to show how these outcomes are a product of the interaction of fundamental tailings properties, site management practices, and climatic conditions of the site. A typical set of test results is presented and discussed in the context of unsaturated soil mechanics. The absence of segregation in thickened and paste tailings is an important factor, but it is often overlooked. The paper addresses the influence of evaporative drying on the sub-aerial beach. The induced suction stresses, combined with compressibility (consolidation) largely influence the rate and extent of density and strength gain that is attributable to the thickened discharge method. Finally, the influence of overall site management practices (e.g. filling rate), together with climatic conditions, are discussed to illustrate how these may act as constraints on the potential to achieve optimum results.","PeriodicalId":410057,"journal":{"name":"Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134040411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of geotechnical, hydromechanical, and chemical behaviour of polymer-treated tailings","authors":"Mohammad Boshrouyeh Ghandashtani, M. Edraki, A. Costine, T. Baumgartl","doi":"10.36487/acg_repo/2115_08","DOIUrl":"https://doi.org/10.36487/acg_repo/2115_08","url":null,"abstract":"","PeriodicalId":410057,"journal":{"name":"Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129272273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comprehensive thickening analysis strategy","authors":"Pamela Ruiz, W. Montes-Quiroz, Klebbert Andrade Corbalan","doi":"10.36487/acg_repo/2115_02","DOIUrl":"https://doi.org/10.36487/acg_repo/2115_02","url":null,"abstract":"The main operational issues that arise in the thickening stage are: 1) high variability in feed resulting in failure to achieve the projected treatments due to high levels of torque, poor overflow water quality, and low concentration of solids in discharge; 2) operational inefficiency due to poorly established control loop and lack of knowledge of metallurgical behaviour in thickening and underflow slurry transport; and 3) poor instrumentation and measurement of parameters due to poor or no maintenance, lack of adequate sensors, and poor analysis of the collected information. The main causes of these problems are undersized equipment, the presence of complex mineralogies, lack or poor quality of measurement of key parameters, and incomplete analysis of relevant operational variables. In such scenarios, the challenge is to identify, in a timely manner, the causes of the limitations in water recovery and operational issues and be able to predict the periods when operational instabilities will arise. This work presents a comprehensive analysis strategy that considers an automated pilot measurement system, together with an advanced analysis of the experimental and operational data, which allows us to identify, at an early stage, the causes of operational inefficiencies and to propose concrete actions for improvement. The proposed system also considers a modelling stage that predicts the behaviour of the tailings under different mineralogy and treatment scenarios.","PeriodicalId":410057,"journal":{"name":"Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129977286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The benefits of integrating long-term tailings and mine plans","authors":"Jarrad Coffey, J. Plunkett, A. Carneiro","doi":"10.36487/acg_repo/2115_15","DOIUrl":"https://doi.org/10.36487/acg_repo/2115_15","url":null,"abstract":"Tailings management plays a significant role in the overall risk profile of mining operations, and there are significant measurable financial, reputational and sustainability benefits associated with achieving leading practice that effectively reduces the risks related to tailings storage facilities (TSFs). Recent TSF failure investigation reports and other literature have emphasised the need to consider innovative means for tailings management to facilitate a reduction of risk, but it appears likely that improved safety performance of TSFs will not only be achieved through advances in design methods, but also in selection of storage options that seek to reduce the consequence of facility failure. To this end, strategic planning in which large horizons of time and varying inter-dependencies of the components that make up the tailings operation are considered is essential. While this is widely acknowledged, there are limited published examples of how mining companies apply strategic planning considering whole-of-life comparisons linking the integration of TSFs embedded within the mine plan. This paper presents a set of case studies where significant benefits have been or are being realised through the integration of long-term tailings and mine planning functions at Rio Tinto Iron Ore mine sites. This has been made possible through the ongoing update of a tailings management plan which includes key inputs from a multi-disciplinary team. It is suggested that the discussion and data presented in this paper will serve to demonstrate that reducing risk, and even costs, is often possible in parallel through strong planning and integration with other disciplines.","PeriodicalId":410057,"journal":{"name":"Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129024858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}