Hojjat HOSSEINZADEH GHAREHGHESHLAGH, Ayşe Tuğba CEBECİ, Şevket Levent ERGÜN

Laboratuvar çalışmaları sonuçları ve benzetim (simülasyon) yöntemi kullanılarak altın cevheri öğütme devreleri ile ilgili seçeneklerin değerlendirilmesi; örnek olay incelemesi: İran Gold Co.

Bu çalışmada İran’daki bir altın madeninde benzetim (simülasyon) destekli düzenlenmiş bir öğütmedevresi konu edilmektedir. Öğütme devresinin tasarımı için gerekli parametreler cevherin özelliklerive uygulanması düşünülen işlem koşullarıdır. Cevher özelliklerini Ağırlık düşürme (Drop-weigh)testi (A.b), aşınma testi $(t_a)$ ve Bond İş İndeksi ($W_i$) belirlemektedir. Bu çalışmada, cevher hazırlamatesisi için gereken işletme koşulları killi minerallerin işlenebilmesi ve tesis kapasitesi ile hidrosiklonüst akımının (Lıç tankı beslemesı) $d_{80}$ ’nidir. Bu tesis için düşünlen kapasite ve $d_{80}$ sırasıyla 125 t/sa ve 45 mikrondur. Simülasyon işlemleri öğütme parametreleri (A, b, $(t_a)$, $W_i$ ), işletme sınırlamaları(tesis kapasitesi, hidrosiklon üst akımının $d_{80}$ ’ni ve kil minerallerini işleme becerisi), farklı tiptekikırıcılar, değirmenler ve separatörlere ait matematiksel modeller ile JKSim yazılımı kullanılarakyapılmıştır. Benzetim işleminin tamamlanmasıyla üzerinde çalışılan cevheri öğütmek için üç farklıseçenek öngörülmüştür. Özgül enerji tüketimi (kWh/t), işletme değişikliklerine duyarlılık ve kilminerallerini işleyebilme becerileri dikkate alınarak, bu üç alternatif öğütme devreleri karşılaştırılmışve değerlendirilmiştir. En uygun devre kil minerallerini işleyebilmeli, en az enerji tüketmeli ve işletmedeğişikliklerine çok duyarlı olmamalıdır. Bu faktörler dikkate alınarak 3 üncü alternatif uygun öğütmedevresi olarak belirlenmiş ve önerilmiştir.

Evaluation of the alternatives for gold ore grinding circuits by using of laboratory studies results and simulation method; case study: İranian Gold Co.

In this study, simulation aided design of grinding circuit for a gold mine in Iran is presented. The main parameters for the design of the grinding circuit are the ore specifi cations and the considered operating conditions. Ore specifi cations were characterized by grinding tests, which included the Drop - weigh test (A, b), the abrasion test $(t_a)$ and the Bond Work Index test ($W_i$). For this study, the operating conditions for the processing plant are the ability to process clayey minerals and the plant throughput and the $d_{80}$ of the hydrocyclone overfl ow (leaching tank feed), which are 125 tons per hour and 45 μm, respectively. Simulation operations were performed using grinding parameters (A, b, $(t_a)$ , $W_i$ ), operating constraints (plant capacity, $d_{80}$ of the hydrocyclone overfl ow and ability to work for clayey minerals), existing mathematical models for different types of crushers, mills and separators and JKSimMet software. By completing the simulation process, three different alternatives for the grinding circuit of the considered ore were predicted. These three alternatives have been compared and evaluated with each other in terms of specifi c energy consumption (kWh/t), sensitivity to operational variables and the ability to process clayey minerals. The optimal circuit must have the capability to process clayey minerals and must have the lowest specifi c energy consumption and the least sensitivity to operational variables. By considering all these factors, the Alternative 3 is selected and suggested for an effi cient grinding circuit.

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