Disposal of iron ore tailings (IOT) in dry stacks is increasingly common in Brazil. IOT are compacted in layers using drum rollers that cause compaction and vibration effects on the ground. Particle breakage is usually observed in granular materials when subjected to large static loads, as can occur depending on the stacking height achieved. This study investigates the breakage behaviour of IOT, simulating load conditions that may arise during compaction of the layers for dry stack construction. Two IOT samples with different amounts of clay-sized particles but similar mineralogy (about 77% quartz and 19% iron oxide – typical of IOT in Brazil) were subject to three different laboratory tests simulating cyclic, compaction and vibration loading. Particle size distribution analyses were performed before and after testing all specimens. Both IOT samples suffered only particle breakage (relative breakage between 0.12 and 0.14 for tailings A and between 0.14 and 0.16 for tailings B) under extremely high pressures (σ′_v = 85 MPa) applied by oedometer testing, above those usually found in the field. For the usual pressures applied in the field, the frequency of load and number of cycles were not significant in particle breakage.

中文翻译：

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铁矿石尾矿干堆：压实过程中可能出现颗粒破碎

在巴西，干堆处置铁矿石尾矿 (IOT) 的情况越来越普遍。IOT 使用滚筒压路机分层压实，对地面产生压实和振动效果。当颗粒材料受到大的静载荷时，通常会观察到颗粒破碎，这取决于所达到的堆积高度。本研究研究了物联网的破损行为，模拟了干堆施工层压实期间可能出现的负载条件。两个 IOT 样品具有不同数量的粘土大小颗粒，但矿物学相似（约 77% 石英和 19% 氧化铁——巴西 IOT 的典型成分），并进行了模拟循环、压实和振动载荷的三项不同的实验室测试。在测试所有样品之前和之后进行粒度分布分析。σ ′ _v  = 85 MPa）通过里程计测试应用，高于现场常见的值。对于现场施加的通常压力，负载频率和循环次数对颗粒破碎影响并不显着。