Abstract
The densities and pH values in the system NaBO2–Na2SO4–H2O at 298.15 K and 323.15 K were investigated. Combining the equilibrium constants for different boron species, the distributions of six boron species in the mixed solution were calculated with total boron concentration and pH values. The molar fractions of the six boron species are mainly affected by the total boron concentration and temperature, but rarely affected by the concentration of SO42–. The dominant boron species in the mixed solution at the two temperatures is B(OH)4‒. The mole fraction of B(OH)3, B5O6(OH)4‒, and B3O3(OH)4‒ can be neglected. The polyborate ions are easier to form as the temperature increases. The results of distribution for boron species in this study and those with the Pitzer model can both be used to describe the distribution of boron species in the mixed solution.
Highlights
IntroductionBoron is usually distributed in liquid brine boron deposits and solid borate deposits [1]
Introduction e Qaidam Basin in QinghaiProvince is rich in boron resources
On the same total boron concentration line, the pH value decreases with the increase of Na2SO4 mole fraction. e data show that the pH of the solution in the system NaBO2–Na2SO4–H2O is mainly affected by m(B). e mole fraction of Na2SO4 for hydrolysis is lesser than that of NaBO2
Summary
Boron is usually distributed in liquid brine boron deposits and solid borate deposits [1]. With the continuous development of social progress and high-tech, borates are widely used in glass production, agricultural and sideline products, and pharmaceuticals, and the application of boron-containing compounds is in aerospace and defense construction [2]. Borates are gaining more and more attention, and global demand for boron will continue to grow over time [3]. High-quality solid boron deposits were almost depleted. Erefore, it is urgent to solve the problem of developing liquid boron resources in western China as soon as possible. Aqueous boron species can be found in natural waters, including seawater, salt lakes, oilfield brine, and hydrothermal fluids [5]
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