Clays and the Minerals Processing Value Chain (MPVC)

Effect of strong acids on red mud structural and fluoride adsorption properties

“…1) is hematite (Fe 2 O 3 ), gibbsite (Al(OH) 3 ), boehmite (c-AlO(OH)), sodalite (Na 8 (Al 6 Si 6 O 24 )Cl 2 or Na 8 (Al 6 Si 6 O 24 )CO 3 ), TiO 2 (anatase and rutile), quartz (SiO 2 ) and possibly cancrinite (Na 6 Ca 2 Al 6 Si 6 O 24 (CO 3 ) 2 ). The broadness of the peaks in the XRD pattern align with the following remarks from Grafe et al [33], that approximately 70% (by weight) of bauxite phases are crystalline, while the remaining 30% are amorphous materials.…”

“…Although the elemental analysis of red mud has been reported in numerous papers, the composition of each red mud sample differs, due to the original composition of the bauxite ore and the operating conditions used to extract alumina. The elemental abundance in bauxite residues generally follow Fe > Si $ Ti > Al > Ca > Na [33]. The red mud used in this work has a particularly high content of aluminium, suggesting that the operating conditions were not optimised.…”

Modeling Multiphase Flow Within and Around Deformable Porous Materials: A Darcy-Brinkman-Biot Approach

“…(c) Comparison between Eqn. 4.7 (solid lines) and experimental datasets on the permeability of three different types of siliciclastic sedimentary rocks (Gräfe et al, 2017;Heap et al, 2017;Revil & Cathles, 1999) and a series of glass bead-smectite mixtures (Abichou et al, 2002). The curves' parameters are: Diamond & Kinter (1956), Liu (2013), Mesri & Olson (1971), and Spearman (2017) and are consistent across the simulations unless specified otherwise.…”

Use of Multi-Anionic Sodium Tripolyphosphate to Enhance Dispersion of Concentrated Kaolin Slurries in Seawater

“…In this context, it is interesting to compare what happens at pH 8 since it is a relevant condition of what happens in the mining industry. It is shown that seawater can create rheological problems in clay pulps, which is a detriment to the mineral processing operations [14,19,33]. Rheological modifiers may be applied in order to reduce the value of the rheological parameters, which is achieved through reagents that stabilize the pulp.…”

“…It has been found that quartz particles (the primary component in tailings) agglomerate in a saline medium, with cations that shield the electric charge and generate cationic bridges between surfaces. The phenomenon is intensified with fine particles and clays that produce higher values of yield stress, complex viscosity, and viscoelastic moduli [14,15].…”