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The Selection Design and Application of Mill Liners for Large Wet Grinding Mills

机译：大型湿磨机磨机衬板的选择设计与应用

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摘要

The history of mill liners has evolved over time and this paper tracks the changes and development ofrnliner technology. It provides an overview of the primary types of liners, the design and the materialsrnof construction. The design of a mill liner is driven by application, materials of construction, castingrntechnology and handling issues. The choice of solid steel, grid liners, rubber or composites andrnmagnetic liners is based on many factors.rnThe methods used for monitoring wear and predicting eventual change out time are many and varied.rnThe contribution of discrete element modeling (DEM) analysis in predicting wear profile is discussed.rnMill trajectory and DEM software programs are used with great effect to predict the effect of lifterrnheight, face angle, high low lifters or mill speed. In the field, trial and operational experience is usedrnor improvements/design concepts at one operation are applied to another. Broken mill lifters,rnaccentuated wear and other problems can be better understood using hardness testing, chemicalrnanalysis and photo micrograph analysis of pearlitic or martensitic structure along with fracture facernobservations. This forms a part of the typical root cause analysis. However given correct and soundrnliner and lifter, feed and discharge design media selection, and materials of construction, the majorityrnof premature liner or bolting failure is normally attributed to incorrect operational methods such asrnexcessive high ball to feed ratio, incorrect mill speed relating to lifter ball throw, incorrect mediarnselection, “tramp” material entering the mill charge from upstream or recirculating process andrnunderstanding the specific mill operation in question.rnIt is hoped that this paper will benefit mill operators who are faced with challenges of improving wearrnlife and at the same time optimizing mill throughput and performance.
机译：轧机衬板的历史随着时间的流逝而发展，本文追踪了衬板技术的变化和发展。它概述了衬套的主要类型，设计和材料结构。轧机衬板的设计取决于应用，结构材料，铸造技术和处理问题。实心钢，网格衬里，橡胶或复合材料和磁性衬里的选择是基于许多因素的。rn用于监测磨损和预测最终变化时间的方法多种多样。rn离散元素建模（DEM）分析在预测磨损中的作用rn铣削轨迹和DEM软件程序可以很好地预测提升机高度，工作面角度，高低提升机或轧机速度的影响。在现场，使用试验和操作经验，或者将一种操作的改进/设计概念应用于另一种操作。使用硬度测试，化学分析和珠光体或马氏体结构的显微照片分析以及断裂面显微观察，可以更好地理解破碎的轧机提升，磨损加剧和其他问题。这构成了典型根本原因分析的一部分。但是，鉴于正确的衬套和升降器正确，合理，进料和卸料设计介质的选择以及结构材料的考虑，多数rnolf过早的衬套或螺栓故障通常归因于不正确的操作方法，例如过高的进给比，不正确的轧机转速与升降器抛球有关，错误的介质选择，从上游或再循环过程进入轧机进料的“流氓”物料，并了解有问题的特定轧机操作。希望本文对受益于改善磨损寿命并同时优化轧机的轧机操作员有所帮助吞吐量和性能。

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  • 会议地点 Perth(AU)
  • 作者

    D Connelly; C Thompson;

  • 作者单位

    Mineral Engineering Technical Services Pty Ltd (METS),PO Box 3211, Perth WA 6831. Email: damian.connelly@mets.net.au;

    Growth Steel, Level 1, 1 Howard Street, Fremantle WA 6160.Email: colin.thompson@growthsteel.com;

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