کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
233887 465371 2011 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Large particle effects in chemical/biochemical heap leach processes – A review
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Large particle effects in chemical/biochemical heap leach processes – A review
چکیده انگلیسی

The application of heap leach technology to recovery of economically important metals, notably copper, gold, silver, and uranium, is wide-spread in the mining industry. Unique to heap leaching is the relatively coarse particle size, typically 12–25 mm top size for crushed and agglomerated ores and larger for run-of-mine dump leaching operations. Leaching from such large particles is commonly assumed to follow shrinking core type behaviour, although little evidence for the validity of this assumption exists. This review investigates the current state of knowledge with respect to the understanding of the characteristics and mineralogy of large particles and how these influence leaching in a heap context and the tools to characterize these. This includes the study of ore and particle properties, visualization techniques for ore characterization, the connection between comminution and leaching behaviour, as well as particle models within heap leach modelling. We contend that the economics of heap leaching are strongly governed by the trade-off between the slow rate and limited extent of leaching from large particles and the cost of crushing finer. A sound understanding of the underlying large particle effects will therefore greatly inform future technology choices in the area of heap leaching.


► Heap leaching has become a major contributor to the extraction of the important metals.
► This review investigates the current state of knowledge of leaching from large particles in heaps.
► The key parameters in heap leaching have been investigated in this paper.
► A sound understanding of the underlying mechanisms will greatly inform future technology.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volume 24, Issue 11, September 2011, Pages 1172–1184
نویسندگان
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