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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.

Characterization and beneficiation of iranian low-grade manganese ore

Mehdilo A., Irannajad M., Hojjati-Rad M. R.

Physicochemical Problems of Mineral Processing

2013

Vol. 49, iss. 2

725--741

The mineralogical studies indicated that the Charagah ore deposit contains approximately 17% pyrolusite, 78% calcite and 3–4% quartz. Pyrolusite as a main valuable mineral is found in the forms of coarse and fine pyrolusites. The coarse grains pyrolusite with simple texture is liberated at 180 micrometers. Another kind of pyrolusite with particle size finer than 10 m is disseminated inside gangue phases. This kind of pyrolusite has important effect in beneficiation processes and can affect the manganese grade of the concentrate and its recovery negatively. By jigging machine a pre-concentrate with 20% MnO and a final tailing with about 13% manganese loss are obtained. Using tabling technique or wet high intensity magnetic separation (WHIMS) and also their combination with jigging machine, production of a final pyrolusite concentrate with suitable grade but average recovery is possible. By jigging-tabling a concentrate with – 500+45 m size fraction, 44.3% MnO and 61.3% recovery is obtained while jigging-WHIMS produces a concentrate containing 52.6% MnO with a recovery up to 56.6% and d80 = 180 m.