Rapid, competitive radium uptake in strontium, barium, and lead sulfates during sulfuric acid leaching

Studies of Mineral Nucleation and Growth Across Multiple Scales: Review of the Current State of Research Using the Example of Barite (BaSO4)

“…Factors that influence recrystallization kinetics include barium-to-sulfate ratios, , solid to liquid ratios, ,, pH, particle size distribution , (further evidence exists for calcite) and crystallinity/porosity. , While most research focusing on radium incorporation into barite in a nuclear waste context have used benign experimental conditions, recent studies , investigated 226 Ra and 210 Pb uptake into highly insoluble sulfates and their solid solutions under harsher conditions that are more likely to occur in hydrometallurgical facilities at mine sites, in boiler operations, or in gas and oil production pipelines. These studies demonstrate the uptake of Ra and Pb into barite crystals as a valid immobilization mechanism under these conditions.…”

Combined U-Pb isotopic signatures of U mill tailings from France and Gabon: A new potential tracer to assess their fingerprint on the environment

“…Pb-sulphide (galena) related to natural hydrothermal alteration of U-rich phases (Gauthier-Lafaye et al, 1996) or (ii) neo-formed Pb-Ba-Ra sulphate related to the milling process involving sulphuric acid (Pagel and Somot, 2002;Schmandt et al, 2019;Rollog et al, 2020).…”

Sorption of Arsenate, Selenate, and Molybdate on the Barite (001) Surface

“…Barite is a common ionically bonded mineral in natural settings such as oceans, lakes, and soils − and engineered environments such as oil and gas extraction industrial pipelines. − Because of its high density (4.2–4.5 g/cm 3 ), it is extensively used as a weighting agent in drilling muds and as an additive to attenuation materials of X- and γ-rays. , Its low solubility ( K sp = 10 –9.98 ) renders it useful to sequester the radioactive cation Ra through interstitial substitution for Ba during coprecipitation. − The capacity and mechanisms of sorption on barite have been studied for selected metal cations (e.g., Sr and Pb). − ,, These studies revealed that both Pb 2+ and Sr 2+ incorporate into the barite surface (e.g., by cation exchange with Ba) and also adsorb on the surface. , In addition to incorporation and adsorption, our recent study showed that Pb 2+ can also form monolayer thin films, probably as a Ba (1– x ) Pb x SO 4 solid solution grown at preexisting molecular steps …”