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 article concerns issues related to the copper ore ball mill grinding process, operating at different technological parameters. aim of study was investigate influence various parameters and feed characteristics on selected effects (comminution degree, yields finest particle size classes, ready for downstream flotation operations). research program included tests two lithological types Polish...