Brine Mineral Equilibrium Studies of a KBr-CaBr2-SrBr2-H2O System at 298.15 K
The deep underground brine of Qaidam Basin in Qinghai is rich in potassium,calcium,strontium,bromine and other elements,making it a liquid mineral resource with great comprehensive utilization value.Notably,its brine can be developed as a potential potassium salt resource.In this study,the solubility and phase equilibrium of the quaternary KBr-CaBr2-SrBr2-H2O system at 298.15 K were studied in detail using the isothermal dissolution equilibrium method,based on the compositional characteristics of the deep underground brine.The solubility and equilibrium solid-phase compositions of the relevant salts of this system were determined.Based on the experimental data,a diagram of the stable phase equilibrium and water content of the system at specific temperature conditions has been plotted.This phase diagram has no complex salt and solid solution generation at 298.15 K,has one invariant point,three univariant dissolution curves,and three solid-phase crystalline zones(KBr,CaBr2·6H2O,SrBr2·6H2O).Based on the Pitzer model,the solubility of this quaternary system at 298.15 K was predicted,and its calculated phase diagram agrees well with the experimental phase diagram.
potassium saltsphase diagrambromidesbrine mineral systemsdeep brines
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