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Economic impact of spargers degradation in flotation columns

机译：散发柱中散发物降解的经济影响

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Flotation is a very complex process, where many variables interact to produce different metallurgic results. These characteristics pose a challenging problem to evaluate the economic impact of deviations of a normal condition. For example, what is the value of a calibration plan to assure the quality of a measurement of froth depth in a cell? Specific experiments designed to evaluate this deviations cannot be implemented in practice, since there are many independent variables changing simultaneously with unknown values.In this paper a methodology applied to estimate the economic impact of spargers degradation in flotation columns is presented. Four pieces of information are required. First, we need to express the association of the deviation from a normal condition with specific characteristics of process variables. In this case how the change in orifice diameter in the sparger affects the air bubble size distribution produced. Second, we need to relate this physical change with the process metallurgic. One way of doing this is to develop a phenomenological model that includes the effect of such variable. Third, we need to relate the metallurgical losses to economic losses. In this case we need to know how the metallurgic changes will affect the value of a concentrate and the extra cost of posterior treatment due to the changed characteristics of this product. Finally the information of how fast a sparger is degraded over time is needed.The methodology is applied to an industrial flotation column, discussing the assumptions made because of the lack of some precise information. The idea is that in spite these uncertainties, at least the most conservative economic evaluation can be made. If one need more precise evaluation to make decisions, then the characteristics of the extra information needed and how to obtain it in an industrial environment is suggested.
机译：浮选是一个非常复杂的过程，许多变量相互作用以产生不同的冶金结果。这些特征构成了挑战性问题，以评估正常情况的偏差的经济影响。例如，校准计划的价值是什么，以确保细胞中泡沫深度测量的质量？旨在评估这种偏差的具体实验不能在实践中实现，因为许多与未知值同时变化的独立变量。本文提出了一种应用估计蒸发器柱子中散发器劣化的经济影响的方法。需要四条信息。首先，我们需要表达与正常条件的偏差关联，具有过程变量的特定特征。在这种情况下，喷射器中孔口直径的变化如何影响产生的气泡尺寸分布。其次，我们需要将这种物理变化与过程冶金有关。这样做的一种方法是开发一种具有这种变量的效果的现象学模型。第三，我们需要将冶金损失与经济损失联系起来。在这种情况下，我们需要知道冶金变化如何影响集中力的价值和由于该产品的特点而导致的后处理的额外费用。最后，需要速度迅速劣化的信息。方法应用于工业浮选栏，讨论了由于缺乏一些精确的信息而制作的假设。这个想法是，尽管这些不确定性，至少可以制定最保守的经济评估。如果需要更精确的评估来做出决定，那么建议在工业环境中所需的额外信息的特征以及如何获得。

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