Chemisorption of water onto anhydrous nanophase manganese oxide surfaces promotes rapidly reversible redox phase changes as confirmed by calorimetry, X-ray diffraction, and titration for manganese average oxidation state. Surface reduction of bixbyite (Mn2O3) to hausmannite (Mn3O4) occurs in nanoparticles under conditions where no such reactions are seen or expected on grounds of bulk thermodyn...

Minerals exposed to moist air stabilize thin water films that drive a score of chemical reactions great importance water-unsaturated terrestrial environments. In this study, we identified Mn (oxy)(hydr)oxide nanocoatings formed by the dissolution, oxidation and precipitation in oxygenated grown on rhodochrosite (MnCO3) microparticles. Nanocoatings could be vibrational spectroscopy, X-ray diffra...

The processing of mining products in indonesia has not been utilized optimally. One them is manganese ore. Way kanan one indonesia's potential ore sites. leaching study used a -200 mesh way that was reacted with sulfuric acid at concentrations 0.1 M, 0.5 and 1 as well corncob reductant. To separate the dissolved iron process, sulfate solution purified sodium hydroxide then filtered to have free...

Carbonate-hosted Mn deposits are widespread in North Africa with most of the ores being hosted by Mesozoic dolomitic formations Moroccan Atlasic system. The Bou Arfa Mn(-Fe) deposit described herein is located eastern High Atlas, close to Front, and has accounted for production ~2 Mt ore grading from 33 82% Mn. mineralization occurs within Sinemurian flat-lying dolostones as stratabound karst-f...

Abstract Nowadays, green synthesis of nanoparticles using plant precursors has been extensively studied. However, less attention given to Mn 3 O 4 . This contribution validates the single-phase Hausmannite by a approach without any standard acid/base compounds, surfactants, and organic/inorganic dissolving agents. The chemical chelation precursor was performed via bioactive compounds Aspalathus...