Solubility products of the trivalent rare-earth phosphates

Use of La-, Ce-, Y-, Fe- bentonites for Removing Phosphate Ions from Aqueous Media

“…This suggests an exothermic surface precipitation process. It is interesting to note that the solubility of some phosphate precipitates changes just at the same way [26].…”

Biogenic dissolution of a soil cerium-phosphate mineral

“…Secondary phosphate mineral dissolution.-Rare-earth orthophosphates such as rhabdophane (CePO 4 ⅐ H 2 O) are amongst the most insoluble materials (solubility product K sp ϭ 10 -25 ; Firsching and Brune, 1991). Due to their low solubility, they are used as chemical tracers of natural fluid-rock processes (Ushakov and others, 2001), have been studied widely for lighting applications, long-term storage of nuclear wastes, and are under consideration as host phases for actinides.…”

Optimization of Acid Leaching of Rare-Earth Elements from Mongolian Apatite-Based Ore

“…To analyze the leaching behavior more specifically during stage 1, a thermodynamic analysis was performed to calculate the leaching pH values for apatite, REE phosphates, and Ca phosphate using thermodynamic data available in the literature [22][23][24][25][26][27]. It was assumed that the concentration of the substance reaches 1.0 mol/L for apatite and Ca phosphate, and 0.1 mol/L for REE phosphates.…”