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Effect of initial specimen height and solids concentration on the consolidation parameters of fine-grained coal tailings 初始试样高度和固体浓度对细粒尾砂固结参数的影响
IF 1.1 Q3 MINING & MINERAL PROCESSING Pub Date : 2021-10-02 DOI: 10.1080/25726668.2021.1957539
S. Islam, David J. Williams, Chenming Zhang
ABSTRACT Proper understanding and analysis of the consolidation behaviour and parameters of tailings from a slurry-like to a soil-like state are vital for the design, management, and assessment of a tailings storage facility (TSF). Fine-grained coal tailings slurry can undergo relatively rapid and substantial settlement from a slurried state and can experience relatively slow and limited self-weight consolidation, remaining slurry-like and under-consolidated, rather than soil-like. A large purpose-built slurry consolidometer having a newly developed consolidometer cell, instrumented with load cells and pore water pressure transducers, is well-suited to test tailings from a slurry-like to a soil-like state and enables the constant rate of loading (CRL) to simulate the build-up of tailings. CRL is more representative of the rate of rise of tailings in a TSF than incremental step loading. By conducting consolidation tests on fine-grained coal tailings from a slurry-state under a loading rate of 0.12 kPa/min up to applied stress of 320 kPa, this research investigated the effect of initial specimen height (ISH) and initial solids concentration (ISC) on consolidation parameters and hydraulic conductivity. Using ISH and ISC as independent inputs, a statistical model has been proposed to estimate the consolidation settlement at the end of the slurry consolidation test.
摘要正确理解和分析尾矿从浆状到土状的固结特性和参数,对尾矿储存库的设计、管理和评价至关重要。细粒煤尾砂浆体从浆态沉降速度较快,沉降量较大,自重固结速度较慢,固结程度有限,保持浆状和欠固结状态,而非土状。大型专用泥浆固结计具有新开发的固结计单元,配有负载传感器和孔隙水压力传感器,非常适合测试从类似泥浆到类似土壤状态的尾矿,并实现恒定加载速率(CRL)来模拟尾矿的积累。CRL比增量阶跃加载更能代表TSF中尾矿的上升速率。通过在加载速率为0.12 kPa/min至施加应力为320 kPa的条件下,对矿浆状态的细粒尾砂进行固结试验,研究了初始试样高度(ISH)和初始固体浓度(ISC)对固结参数和水力导率的影响。以ISH和ISC为独立输入,建立了浆体固结试验结束时固结沉降的统计模型。
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引用次数: 0
Procedure for estimating broken ore density distribution within a draw column during block caving 块状崩落时放矿柱内破碎矿密度分布估计程序
IF 1.1 Q3 MINING & MINERAL PROCESSING Pub Date : 2021-07-03 DOI: 10.1080/25726668.2021.1886544
L. Dorador, E. Eberhardt, D. Elmo
ABSTRACT Broken ore density (BOD) is an important parameter in planning a block cave mine. However, its assessment is complicated by the heterogeneous nature of its distribution within a draw column, varying from a denser central plug-flow zone and decreasing outwards towards outer perimeter shear bands. The BOD further decreases immediately above the drawpoint due to the development of a loosening zone that develops in response to mucking. This makes determining BOD a challenging task, hindered by the inability to measure it in situ. To address this, several key factors influencing BOD are investigated including the influence of primary and secondary fragmentation, air gap thickness, draw rate and column height. Data is used to link primary and secondary fragmentation to broken ore size distributions. From these, a conceptual framework and empirical procedures are presented for evaluating BOD within draw columns during block caving for feasibility and early stage mine planning and design.
破碎矿密度(BOD)是块状溶洞矿山规划的重要参数。然而,由于其在抽拔柱内分布的非均匀性,其评估变得复杂,从较密集的中心塞流区到向外周剪切带逐渐减少。由于淤泥淤积形成了松动带,BOD在抽汲点以上立即进一步降低。这使得确定BOD成为一项具有挑战性的任务,因为无法在原位测量它。为了解决这一问题,研究了影响BOD的几个关键因素,包括一次破碎和二次破碎、气隙厚度、拉出率和塔高的影响。数据用于将初级和次级破碎与破碎的矿石粒度分布联系起来。在此基础上,提出了一个概念框架和经验程序,用于评估块状崩落过程中抽采柱内BOD的可行性和早期矿山规划设计。
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引用次数: 1
Measuring blast fragmentation at Nui Phao open-pit mine, Vietnam using the Mask R-CNN deep learning model 使用Mask R-CNN深度学习模型测量越南Nui phhao露天矿的爆炸碎片
IF 1.1 Q3 MINING & MINERAL PROCESSING Pub Date : 2021-06-30 DOI: 10.1080/25726668.2021.1944458
Trong Vu, T. Bao, Q. Hoang, Carsten Drebenstetd, Pham Van Hoa, Hoang Hung Thang
ABSTRACT Blast fragmentation size distribution is one of the most critical factors in evaluating the blasting results and affecting the downstream mining and processing operations in open-pit mines. Image-based methods are widely applied to address the problem but require heavy user interaction and experience. This study deployed a deep learning model Mask R-CNN to develop an automatic measurement method of blast fragmentation. The model was trained using images captured from real blasting sites in Nui Phao open-pit mine in Vietnam. The trained model reported high average precision scores (Intersection over Union, IoU = 0.5) 92% and 83% for bounding box and segmentation masks, respectively. The results lay a solid technical basis for the automated measurement of blast fragmentation in open-pit mines.
摘要露天矿爆破破片粒度分布是评价爆破效果和影响下游开采加工作业的关键因素之一。基于图像的方法被广泛应用于解决问题,但需要大量的用户交互和经验。本研究采用深度学习模型Mask R-CNN,开发了一种爆炸破片自动测量方法。该模型使用从越南Nui phhao露天矿真实爆破现场捕获的图像进行训练。训练后的模型对边界框和分割掩码的平均精度得分(Intersection over Union, IoU = 0.5)分别为92%和83%。研究结果为露天矿爆破破片的自动化测量奠定了坚实的技术基础。
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引用次数: 11
Non-deterministic load and dump behaviour in mining haul trucks: a case of study 矿用运输卡车的非确定性装载和倾卸行为:一个案例研究
IF 1.1 Q3 MINING & MINERAL PROCESSING Pub Date : 2021-06-11 DOI: 10.1080/25726668.2021.1937455
R. C. Barbosa, Carlos E. P. Ortiz, A. Curi
ABSTRACT Complex load and haul cycles in mining are composed of individual steps, whose times could be better described by a statistical distribution than by the average value. In order to evaluate how loading times and dumping times behave, this paper tested a large dataset of loading and dumping times measured at an open pit limestone mine in Brazil against the distributions most commonly used to model these variables, Log-normal and Normal; as well as Gamma, Logistic, Weibull and Exponential distributions. None of the tested distributions provided statistically significant adherence to the data, but it was possible to identify that for most equipment, Logistic and Normal distributions would produce less error on stochastic modelling then the other tested distributions.
采矿中复杂的装载和运输周期是由单个步骤组成的,其时间用统计分布比用平均值更好地描述。为了评估装载时间和倾倒时间的行为,本文测试了巴西一个露天石灰石矿山测量的装载和倾倒时间的大型数据集,对比最常用的分布来模拟这些变量,对数正态和正态;以及伽玛分布、Logistic分布、威布尔分布和指数分布。测试的分布都没有提供统计上显著的数据依从性,但可以确定的是,对于大多数设备,Logistic和正态分布在随机建模上产生的误差比其他测试的分布要小。
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引用次数: 1
A method to assess haul roads rolling resistance using dispatch system data 一种利用调度系统数据评估运输道路滚动阻力的方法
IF 1.1 Q3 MINING & MINERAL PROCESSING Pub Date : 2021-06-04 DOI: 10.1080/25726668.2021.1935098
Douglas Alexandre Gonçalves Alegre, Rodrigo De Lemos Peroni, Eduardo da Rosa Aquino, Felipe Dille
ABSTRACT Haul roads play a significant role in mining, with rolling resistance being one of the main aspects that can affect road quality and consequently the performance of mining trucks. The aim of this study is to estimate the rolling resistance of haul road segments considering longitudinal grade crossed with dispatch system data using back-calculation from Rimpull curves and estimated performance equations developed by Cooper. The use of this method demonstrated that it could assist in quickly identifying issues on mine haul roads and assess road quality locally through rolling resistance estimated maps, which will help to improve maintenance routines and truck performance.
运输道路在采矿中起着重要的作用,滚动阻力是影响道路质量的主要方面之一,从而影响矿用卡车的性能。本研究的目的是估计运输路段的滚动阻力,考虑纵向坡度与调度系统数据交叉,使用环拉曲线和库珀开发的估计性能方程的反向计算。这种方法的使用表明,它可以帮助迅速查明地雷运输道路上的问题,并通过滚动阻力估计地图评估当地的道路质量,这将有助于改善维修程序和卡车性能。
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引用次数: 3
Evaluation of mine waste characterization to identify opportunities for optimizing project economics using fragmentation analysis 评价矿山废物特性,利用破碎化分析确定优化项目经济效益的机会
IF 1.1 Q3 MINING & MINERAL PROCESSING Pub Date : 2021-05-21 DOI: 10.1080/25726668.2021.1927587
T. Komba
ABSTRACT As metal mineral resources get depleted over time, there is a need to recover metals from ores of lower grades and waste. Mining wastes are largely characterized using physical and mineralogical heterogeneity properties. There is variation in the geochemical properties with different grain sizes, thus, different metal recovery potential. The research evaluated mine waste characterization and identified opportunities for optimizing project economics using fragmentation analysis. This study linked petrographic, compositional and quantitative mineralogical analyses with fragmentation data resulting from conventional mechanical communition of mined-out waste rock. The results improve the understanding of what grain sizes are optimal for metal recovery from the waste rock and established that environmental threats can be mitigated by removing fines from waste. The economic metals including Ni and Cu sulphides are predominantly held in pentlandite and chalcopyrite within the rocks. Maximum liberation and metal recovery are in the finer grains.
随着时间的推移,金属矿产资源逐渐枯竭,需要从低品位矿石和废料中回收金属。采矿废物在很大程度上是用物理和矿物学的非均质性来表征的。不同粒度的矿石地球化学性质存在差异,因而具有不同的金属回收潜力。该研究评估了矿山废物的特性,并确定了利用破碎分析优化项目经济的机会。这项研究将岩石学、成分和定量矿物学分析与采出废石的常规机械通信产生的破碎数据联系起来。研究结果提高了人们对从废石中回收金属的最佳粒度的理解,并确定了通过从废物中去除细粒可以减轻环境威胁。经济金属包括镍和铜硫化物主要存在于岩石中的镍黄铁矿和黄铜矿中。最大的解离和金属回收是在细晶粒中。
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引用次数: 1
Truck fleet size selection in open-pit mines based on the match factor using a MINLP model 基于匹配因子的露天矿卡车车队规模选择
IF 1.1 Q3 MINING & MINERAL PROCESSING Pub Date : 2021-05-03 DOI: 10.1080/25726668.2021.1919374
M. Mohtasham, Hossein Mirzaei-Nasirabad, H. Askari-Nasab, B. Alizadeh
ABSTRACT The present study aims to propose new strategies based on mixed-integer non-linear programming (MINLP) models for the equipment sizing (ES) problem to verify the overall efficiency of the fleet. The developed models estimate the optimal size of trucks concerning the match factor value with two different strategies. The first strategy deals with each loader type, and the second one is applied simultaneously with all types of loaders. The proposed approaches are compared to a simulation strategy to assess the models. Implementing models with a copper mine case study provides a more efficient haul fleet size than the decisions offered by the simulation method. Moreover, the presented strategies provide an effective way to improve equipment performance where the current mine strategy does not adapt well. A key contribution of this research is the development, implementation, and verification of new optimization and simulation methods to address the ES problem in open-pit mines.
摘要本研究旨在提出基于混合整数非线性规划(MINLP)模型的新策略来验证船队的整体效率。所建立的模型根据两种策略的匹配因子值来估计卡车的最优尺寸。第一种策略处理每种加载器类型,第二种策略同时应用于所有类型的加载器。将提出的方法与仿真策略进行了比较,以评估模型。以铜矿为例实施模型比仿真方法提供的决策更有效的运输车队规模。此外,本文提出的策略为提高现有矿山策略不能很好适应的设备性能提供了有效途径。本研究的一个关键贡献是开发、实施和验证新的优化和模拟方法,以解决露天矿的ES问题。
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引用次数: 10
Optimization of truck-shovel allocation in open-pit mines under uncertainty: a chance-constrained goal programming approach 不确定条件下露天矿车铲配置优化:一种机会约束目标规划方法
IF 1.1 Q3 MINING & MINERAL PROCESSING Pub Date : 2021-04-03 DOI: 10.1080/25726668.2021.1916170
M. Mohtasham, Hossein Mirzaei-Nasirabad, B. Alizadeh
ABSTRACT The truck allocation problem is an important section of the transportation system in open-pit mines. Most available models for the truck scheduling problem do not directly address the stochastic nature of truck-shovel systems by using multi-objective optimization techniques. This paper presents a chance-constrained goal programming (CCGP) model based on four important goals to estimate the impacts of the uncertainty on the efficiency of truck-shovel systems. The proposed model has been implemented using 11 schedule scenarios and different confidence levels (CLs) for loader’s production to determine the best allocation of trucks in an open-pit copper mine. The results display that the model can handle the quality and quantity of material required to achieve the objectives of the short-term production schedule of the mine in all CLs, even in the highest risk level. This model has a remarkable ability to meet the required objectives in terms of uncertainty in mining operations.
卡车调度问题是露天矿运输系统的重要组成部分。大多数现有的卡车调度模型都没有使用多目标优化技术直接解决卡车-铲系统的随机特性。提出了一种基于四个重要目标的机会约束目标规划模型,用于估计不确定性对铲车系统效率的影响。采用装载机生产的11种调度方案和不同的置信水平(cl)对该模型进行了实施,以确定露天铜矿装载机生产的最佳卡车分配。结果表明,即使在最高风险水平下,该模型也能处理好实现矿山短期生产计划目标所需物料的质量和数量。这一模式在应付采矿作业的不确定性方面具有显著的能力。
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引用次数: 16
Catalogue of example instrumentation and monitoring systems for tailings dams in Australia 澳大利亚尾矿坝实例仪表和监测系统目录
IF 1.1 Q3 MINING & MINERAL PROCESSING Pub Date : 2021-03-22 DOI: 10.1080/25726668.2021.1901026
Luke Clarkson, David J. Williams
ABSTRACT New literature, mining regulators, insurance firms, and mining practitioners are calling for increased diligence in the form of real-time monitoring: but what can the industry offer in response? This research establishes a centralisation of instrumentation systems suitable for tailings dams, discussing the specifications, advantages, and disadvantages of each. This paper describes an understanding of dataloggers and sensor nodes, sensor networks, and online monitoring systems critical to the transmission and reception of sensor data across vast and remote site areas. Collaboration with suppliers discovered systems which enable reliable, efficient, and real-time transmission of instrumentation data, ready for interpretation. This paper aims to translate traditionally electrical and systems engineering terminology into a reference base suitable for the broad range of tailings dam practitioners. This reference base is anticipated to help facilitate informed discussions and encourage deployment of appropriate instrumentation systems that are suitable to the practitioner’s short- and long-term intent.
新文献、矿业监管机构、保险公司和矿业从业者都在呼吁以实时监控的形式增加尽职调查:但行业能提供什么回应?本研究建立了一个适用于尾矿坝的集中仪器系统,讨论了每种仪器的规格、优点和缺点。本文描述了对数据采集器和传感器节点、传感器网络和在线监控系统的理解,这些系统对于在广阔和偏远的站点区域传输和接收传感器数据至关重要。与供应商合作,发现了能够可靠、高效和实时传输仪器数据的系统,并准备好进行解释。本文旨在将传统的电气和系统工程术语翻译成适合广泛的尾矿坝从业人员的参考基础。这个参考基础预计将有助于促进知情的讨论,并鼓励部署适合从业者短期和长期意图的适当仪器系统。
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引用次数: 1
Optimisation of long-term quarry production scheduling under geological uncertainty to supply raw materials to a cement plant 地质不确定条件下采石场长期生产调度优化
IF 1.1 Q3 MINING & MINERAL PROCESSING Pub Date : 2021-03-03 DOI: 10.1080/25726668.2021.1894398
Trong Vu, T. Bao, C. Drebenstedt, H. Pham, Hoai-Quoc-Trung Nguyen, Duc Nguyen
ABSTRACT The success of a cement production project depends on the supply of raw materials. Long-term quarry production scheduling (LTQPS) based on resource models is essential to maintain a consistent supply to cement plants. Geological uncertainty is inherent due to sparse exploration data in resource models and significant risk factors for not achieving production targets. This research proposes a stochastic framework for LTQPS that considers the impact of geological uncertainty on raw material supply. A clustering algorithm uses multiple simulated deposit models to aggregate blocks into mining cuts. A new stochastic mixed-integer programming model is formulated with two objectives: to minimise the cost for developing the raw mix and the risk of not meeting production targets. The proposed framework is implemented successfully in a limestone deposit in Southern Vietnam, resulting in an increase of 5 million tons (Mt) and a 30% reduction in unit cost over the deterministic mixed-integer programming model.
水泥生产项目的成功与否取决于原材料的供应。基于资源模型的采石场长期生产调度(LTQPS)是保证水泥厂稳定供应的关键。由于资源模型中勘探数据的稀疏性和未实现生产目标的重大风险因素,地质不确定性是固有的。本研究提出了一个考虑地质不确定性对原材料供应影响的LTQPS随机框架。聚类算法使用多个模拟矿床模型将区块聚集成采矿切口。建立了一种新的随机混合整数规划模型,该模型具有两个目标:使原料混合料的开发成本最小化和不满足生产目标的风险最小化。所提出的框架在越南南部的石灰岩矿床中成功实施,与确定性混合整数规划模型相比,增加了500万吨(Mt),单位成本降低了30%。
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引用次数: 2
期刊
Mining Technology-Transactions of the Institutions of Mining and Metallurgy
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