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2 Physicochemical Problems of Mineral Processing

2 2021

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Physicochemical study and application for pyrolusite separation from high manganese-iron ore in the presence of microorganisms

Farghaly Mohamed Galal, Abdel-Khalek Nagui Aly, Abdel-Khalek Mohamed Abdel-Dayem, Selim Khaled Abdelaal, Abdullah Samah Saleh

Physicochemical Problems of Mineral Processing

2021

Vol. 57, iss. 1

273--283

Paenibacillus polymyxa bacteria strain as a surface modifier in a flotation process could remove 64.89% of MnO2 from high manganese iron ore. A concentrate containing 3.7% MnO2, 0.5% SiO2 and 71.30% Fe2O3, with a hematite recovery of 72.46% is produced from a feed containing 8.79% MnO2, 0.49% SiO2 and 67.90% Fe2O3. The bio-flotation results indicated that such type of bacteria is selective for upgrading El-Gedida iron ore from the Western Desert of Egypt. The role of Paenibacillus polymyxa on the surface properties of pyrolusite and hematite single minerals was investigated through zeta potential, FTIR and adsorption measurements.

Effect of polyacrylic acid molar mass as a surface modifier on rheological properties of calcium carbonate suspensions

Selim Khaled Abdelaal, Farghaly Mohamed Galal, Abdallah Samah Saleh, Abdel-Khalek Mohamed Abdel-Dayem

Physicochemical Problems of Mineral Processing

2021

Vol. 57, iss. 4

18--26

Suspensions of calcium carbonate are of a major concern in various fields, such as coating, painting and ceramics and their rheological properties are very important. The effect of polyacrylic acid (PAA) of different molecular mass as a surface modifier on the surface and rheological properties of the aqueous suspension of calcium carbonate was investigated. The effect of the volume fraction of particles and polymer concentration on the viscosity at lower shear rate was discussed. The flow behavior of the concentrated suspension in the presence of PAA can be explained by the difference of the repulsive force among particles, induced by the adsorbed polymer. The results showed that the dispersibility is more pronounced by the steric hindrance behavior rather than the electrostatic behavior.