Comminution is an essential step in processing itabirite ores, given the need to liberate silica and other contaminants from iron minerals for downstream concentration then pellet feed production. In general, these ores Brazil are not particularly hard crush grind, but both capital (CAPEx) operating (OPEx) expenditures this stage of preparation can be critical project, particular due uncertaint...

Samples of sediments from beneath Ice Stream B (at camp UpB), West Antarctica, provide the first opportunity to study the relationship between sediment properties and physical conditions in a sub-ice-stream environment. Piston coring in holes bored by hot-water drilling yielded five 1–3 m long, undisturbed subglacial sediment cores. We analyzed granulometry, composition, and particle morphology...

Confined bed comminution in high-pressure grinding rollers (HPGRs) and vertical roller mills (VRMs) was previously used preferably for comparably homogeneous materials such as coal or clinker. Meanwhile, it started to complement even replace tumbling ore beneficiation with gangue particles of rather different breakage behaviors. The selectivity the a mixture strengths but similar particle size ...

The main objective in production blasting is to achieve a proper fragmentation. In this paper, rock fragmentation the Sarcheshmeh copper mine has been predicted by developing a model using artificial neural network. To construct the model, parameters such as burden to spacing ratio, holediameter, stemming, total charge-per-delay and point load index have been considered as input parameters. A m...