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Development and validation of a model for steel grinding media wear in tumbling mills.

机译：滚磨机中钢磨料磨损模型的开发和验证。

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摘要

Concern regarding grinding media wear is as old as the invention of the tumbling mill itself. Over the years many techniques have been tried in an attempt to minimize costs associated with grinding. These have included experimentation with different metals, non-metals and different shapes. Through all this, steel grinding balls have proved the most effective media for comminution in tumbling mills.;As old as the tumbling mill is, no accurate technique for estimating the wear of the ball charge has been developed. The mining industry still utilizes the Bond Abrasion test that was developed in the early 1960s. This test which is based solely on the ore properties is inadequate giving a standard deviation in excess of 100%. This can results in high degree of error which for greenfield applications can indicate profitability for non-profitable operations and vice versa.;Peter Radziszewski proposed a decoupled total grinding media wear model that could be used to predict grinding media instead of using the Bond abrasion test. This new model had a standard deviation of 56%, which was a great improvement over the bond abrasion wear estimates. This new model also allowed for the first time, the three wear modes, abrasion, corrosion and impact, responsible for grinding media wear to be quantified. This was an important development as the ability to identify the dominant wear mode in any given operation gives operators a chance to target reduction of wear. The current mining trend is towards exploitation of lower grade ores as the higher grades become depleted. These low-grade ores require finer grinding for the liberation of the value minerals. This in turn means higher ball consumption and higher beneficiation costs. The reduction of ball wear to minimise the overall cost of ore processing operation is going to be a primary concern for all concentrators.;The objective of the research that forms the basis of this thesis was to improve the accuracy of the decoupled grinding media wear model. This was achieved by refining the tests and methodologies used to determine the wear components that make up the decoupled grinding media wear model, performing fundamental testwork to determine a more accurate structure of the decoupled model, and validating this new model.;The new model termed the "modified decoupled grinding media wear model", gives better accuracy in predicting grinding media wear than both the Bond abrasion test and the original decoupled model.
机译：关于研磨介质磨损的担忧与滚磨机本身的发明一样古老。多年以来，已经尝试了许多技术，以尽量减少与磨削相关的成本。这些包括对不同金属，非金属和不同形状的实验。通过所有这些，钢制磨球已被证明是粉碎机中最有效的粉碎介质。;尽管粉碎机很古老，但尚未开发出估算球料磨损的精确技术。采矿业仍然使用1960年代初开发的邦定磨损试验。仅基于矿石性质的测试不足以给出超过100％的标准偏差。这可能会导致高度错误，这对于未开发的应用程序可能会指示非盈利性运营的获利能力，反之亦然。; Peter Radziszewski提出了一种解耦的总研磨介质磨损模型，该模型可用于预测研磨介质而不是使用Bond磨损测试。该新模型的标准偏差为56％，大大超过了粘结磨损的估计值。这个新模型还首次允许对磨料磨损的三种磨损模式（磨损，腐蚀和冲击）进行量化。这是一项重要的发展，因为在任何给定操作中识别主要磨损模式的能力为操作员提供了减少磨损的目标。当前的采矿趋势是随着高品位的枯竭而开采低品位的矿石。这些低品位矿石需要精磨才能释放出有价值的矿物。反过来，这意味着更高的球消耗量和更高的选矿成本。减少球磨耗以最大程度降低矿石加工操作的总体成本将是所有选矿厂的首要考虑。；构成本论文基础的研究目的是提高解耦的磨料磨耗模型的准确性。这是通过改进用于确定分离的磨料磨损模型的磨损组件的测试和方法，执行基本的测试工作来确定分离的磨具模型的更精确结构以及验证此新模型来实现的。与邦德磨耗测试和原始解耦模型相比，“修改后的解耦研磨介质磨损模型”在预测研磨介质磨损方面具有更高的准确性。

著录项

  • 作者

    Chenje, Tapiwanashe W.;

  • 作者单位

    McGill University (Canada).;

  • 授予单位 McGill University (Canada).;
  • 学科 Engineering Metallurgy.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 216 p.
  • 总页数 216
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;
  • 关键词

  • 入库时间 2022-08-17 11:39:33

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