Effects of Sulfuric Acid on the Synthesis of Highly Pure Calcium Borate in the Boron-Containing Brine and Bittern

Title & Authors
Effects of Sulfuric Acid on the Synthesis of Highly Pure Calcium Borate in the Boron-Containing Brine and Bittern
Seo, Hyo-Jin; Kim, Myoung-Jin;

Abstract
In this study, we investigated the effects of sulfuric acid on the synthesis of calcium borate in the artificial boron-containing brine (bittern) saturated with calcium hydroxide. For the study, we attempted to synthesize calcium borate under various conditions such as reaction temperature, reaction time, and cooling temperature after heating, and then to examine the recovery and purity of the calcium borate according to the presence or absence of sulfuric acid at each condition. The XRD analysis confirmed that, regardless of the presence of sulfuric acid, the calcium borate ($\small{Ca_2B_2O_5{\cdot}H_2O}$) was synthesized, while, in the presence of sulfuric acid, the calcium sulfate ($\small{CaSO_4{\cdot}0.5H_2O}$) was produced as a by-product. In all the experiments performed by varying the reaction temperature and time, the recovery and purity of the calcium borate without sulfuric acid were observed higher than those with it. The results indicated that the addition of sulfuric acid increased the solubility of the calcium hydroxide, but the calcium sulfate produced as a by-product could decrease the recovery and purity of the calcium borate by preventing the synthesis. In this study, the artificial boron-containing brine (bittern) (500 mg-B/L) was saturated with calcium hydroxide in the absence of sulfuric acid, and then the solution was heated at $\small{80-105^{\circ}C}$ for less than 10 minutes to synthesize the calcium borate. The recovery and purity of calcium borate were measured as high as 80 % and 96 %, respectively.
Keywords
boron;brine;bittern;calcium borate;sulfuric acid;calcium hydroxide;
Language
Korean
Cited by
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