Characterization of Minerals, Metals, and Materials 2014 - Characterization of Particle Damage and Surface Exposure of a Copper Ore Processed by Jaw Crusher, HPGR and Electro‐dynamic Fragmentation

این کتاب در فیلد «فرآوری مواد معدنی مس» و زیرموضوع «ذوب مس» قرار می‌گیرد. محورهای قابل تشخیص از عنوان و متادیتای Lens عبارت‌اند از: ذوب، بیولیچینگ، لیچینگ، باطله. این منبع مستقیماً بر یکی از اجزای زنجیره ارزش مس تمرکز دارد. برای تحلیل خردایش، پرعیارسازی، فلوتاسیون و رفتار کانه‌های مس قابل استفاده است. این متن یک خلاصه موضوعی فارسی بر پایه متادیتای موجود است؛ چکیده انگلیسی، در صورت وجود، در ستون جداگانه حفظ شده است.

Heap bioleaching is gaining importance as a low cost technology for processing low grade ores and tailings. Furthermore, it can be employed to process large particles and aggregates. Nevertheless, only grains at the surface are exposed to the leaching solution. The present work aims at investigating the effect of different crushing methods in the generation of cracks in order to improve the surface exposure of copper sulphides. A method for the microstructural characterization of samples composed by macroscopic particles, i.e., around 1 mm or more in a resolution better than 1 μm, is employed. This method involves large cross-sections preparation, image acquisition on SEM, automatic mosaicing, and image processing and analysis. The results show that it is possible to increase the copper sulphide minerals exposure through the generation of cracks by secondary crushing for a given particle size range. Introduction The availability of high grade ores is decreasing in the world. Moreover, the mining industry has suffered with the rise on energy cost and the growing environmental constraints. Therefore, there has been a growing interest to search and develop more efficient and sustainable processes, such as the ones capable to exploit low grade mineral resources and tailings. In this context, heap bioleaching is gaining importance as a low cost technology for processing low grade ores. It is currently used for extracting base metals such as copper, nickel, cobalt etc., and precious metals such as gold and silver. In fact, bioleaching constitutes an alternative process to roasting, smelting and pressure leaching, avoiding their high energy consumption, with less pollution and safety risks. Furthermore, bioleaching is generally employed for processing large particles and aggregates. Despite its energy efficiency, this fact leads to a limitation as only grains at the surface of particles are exposed to the leach solution. n o o o o o ÷ o o u u ÷ u u o u u ý þ ý y u þ u ÷ o u u o o þ o u u ÷ u o ! " # $ % & " ' ( ) & * + " , * % + . / 0 1 2 . 3 4 2 5 6 7 8 9 . 2 : 6 7 8 ; . 6 : 2 5 3 6 7 8 / ? 9 @ A B C