No abstract

Black Phosphorus (BP) is a single-element two-dimensional (2D) layered material, similar to graphene, where the atomic layers are stacked together by van der Waals interactions. BP has the advantages of high carrier mobility, tunable bandgap, large theoretical specific volume ratio, and good mechanical properties. It has bright application prospects in optoelectronic devices, energy storage, sensing, lubrication, and other fields. Based on a large number of papers, the structure properties, preparation methods, tribological properties, and lubrication mechanism of graphene-like layered BP are reviewed. The research trend of BP as a lubricating material are summarized and prospected: (1) Reduce production costs and further increase production, (2) research and development of diverse structures of nano BP, (3) improve stability, and (4) functional research.

Red mud is a kind of polluted waste residue discharged from extracting alumina in aluminum industry. If not handled properly, it will cause great harm to the ecological environment. The iron resource in red mud has the value of recycling, and it is a research hotspot at home and abroad. Iron extraction from red mud is the primary process of the red mud treatment process, and is the key to the subsequent treatment process of red mud. In this paper, taking the extraction of iron from Bayer red mud as the theme, several kinds of process methods for separation of iron, related research results at home and abroad and various process methods are introduced. This paper introduces the Bayer red mud iron extraction process and related equipment, which provides a certain research basis for the full quantitative treatment of red mud.