Reductive leaching in the Bayer cycle using iron (2+) allows for Al extraction to be significantly increased through magnetization of Al-goethite and Al-hematite. However, use expensive salts or powder as a source leads significant increase production costs. In this work, feasibility new method, reductive bauxite an electrolysis process, was investigated. The reduction minerals boehmitic both s...

The Bayer process utilises high concentrations of caustic and elevated temperature to liberate alumina from bauxite, for the production of aluminium and other chemicals. Within Australia, this process results in 40 million tonnes of mineral residues (Red mud) each year. Over the same period, the energy production sector will produce 14 million tonnes of coal combustion products (Fly ash). Both ...

In the present study, prediction of Alumina recovery efficiency (A.R.E), the amount of produced red mud (A.P.R), red mud settling rate (R.S.R) and bound-soda losses (B.S.L) in Bayer process red mud has been carried out for the first time in the field. These predictions are based on Lime to bauxite ratio and chemical analyses of bauxite and lime as Bayer process feed materials. Radial basis func...

With the goal of demonstrating the advantages of supercomputer simulations for process design and operations, Bayer AG recently teamed up with Cray Research to perform plantwide dynamic simulations of an entire Bayer production facility in Leverkusen. This paper presents project results and benefits from both a computational standpoint and a Bayer company perspective. Regarding computational as...

Gallium extraction from Jajarm Bayer process liquor (Jajarm, Iran) was investigated using microemulsions. Also the behavior of aluminum was studied as an impurity. Kelex100 (4-ethyl, 1-methyl, 7-octyl, 8-hydroxyquinoleine), iso-decanol and n-butanol, and kerosene were used as the surfactant, co-surfactant, and oil phase, respectively. Ternary phase diagrams were produced using various co-surfac...

A single sensor color imaging device has a color filter array (CFA) laid on top of its photodiodes, which spatially samples bandpassed spectral responses. Hence, with the popular Bayer pattern, at every pixel site either red, green or blue light is measured. A process known as demosaicing interpolates the vector-valued color image from the scalar-valued sensor output, termed here as the Bayer i...