A cleaner production strategy for acid mine drainage prevention of waste rock: A porphyry copper case

IF 11.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology Pub Date : 2024-08-01 DOI:10.1016/j.ijmst.2024.07.012

Yesica L. Botero , Isabelle Demers , Luis A. Cisternas , Arnoldo Ávila , Mostafa Benzaazoua

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引用次数: 0

Abstract

An in-process technology approach is proposed to identify the source of acid mine drainage (AMD) generation and prevent its formation in a porphyry copper waste rock (WR). Adopting actions before stockpiling the WR enables the establishment of potential contaminants and predicts the more convenient method for AMD prevention. A WR sample was separated into size fractions, and the WR’s net acid-generating potential was quantified using chemical and mineralogical characterization. The diameter of physical locking of sulfides (DPLS) was determined, and the fractions below the DPLS were desulfurized using flotation. Finally, the WR fractions and tailing from the flotation test were submitted to acid-base accounting and weathering tests to evaluate their acid-generating potential. Results show that the WR’s main sulfide mineral is pyrite, and the DPLS was defined as 850 µm. A sulfide recovery of 91% was achieved using a combination of HydroFloat® and Denver cells for a size fraction lower than DPLS. No grinding was conducted. The results show that size fractions greater than DPLS and the desulfurized WR are unlikely to produce AMD. The outcomes show that in-processing technology can be a more proactive approach and an effective tool for avoiding AMD in a porphyry copper WR.

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防止废石酸性矿山排水的清洁生产战略：斑岩铜矿案例

本文提出了一种工艺内技术方法，用于确定酸性矿山排水（AMD）产生的源头，并防止其在斑岩型铜矿废石（WR）中形成。在堆放 WR 之前采取行动，可以确定潜在的污染物，并预测更方便的防止 AMD 的方法。将 WR 样品分成不同大小的部分，并利用化学和矿物学特征对 WR 的净酸生成潜力进行量化。确定了硫化物的物理锁定直径（DPLS），并使用浮选法对 DPLS 以下的部分进行了脱硫处理。最后，对浮选试验中的 WR 馏分和尾矿进行了酸碱核算和风化试验，以评估其产酸潜力。结果显示，WR 的主要硫化矿物是黄铁矿，DPLS 定义为 850 微米。在使用 HydroFloat® 和 Denver 电解槽的情况下，硫化物回收率达到 91%，粒度小于 DPLS。没有进行研磨。结果表明，粒度大于 DPLS 的颗粒和脱硫 WR 不太可能产生 AMD。结果表明，在斑岩型铜矿的 WR 中，内处理技术是一种更为积极的方法，也是避免 AMD 的有效工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Mining Science and Technology Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

19.10

自引率

11.90%

发文量

2541

审稿时长

44 days

期刊介绍： The International Journal of Mining Science and Technology, founded in 1990 as the Journal of China University of Mining and Technology, is a monthly English-language journal. It publishes original research papers and high-quality reviews that explore the latest advancements in theories, methodologies, and applications within the realm of mining sciences and technologies. The journal serves as an international exchange forum for readers and authors worldwide involved in mining sciences and technologies. All papers undergo a peer-review process and meticulous editing by specialists and authorities, with the entire submission-to-publication process conducted electronically.