@article{article_325756, title={Optimization of Removal of Calcium Ions Forming During Synthesis of Boric Acid from Ulexite Ore by Using Ion Exchange Resin}, journal={Journal of Boron}, volume={3}, pages={109–117}, year={2018}, DOI={10.30728/boron.325756}, url={https://izlik.org/JA62AL68TF}, author={Doğan, Tuba Hatice and Yartaşı, Ahmet}, keywords={Ulexite,Boric Acid,Calcium Removal,Ion Exchange Resin}, abstract={<p style="margin:0px 5px 0px 0px;text-align:justify;line-height:200%;"> <span style="margin:0px;"> <i> <span lang="en-us" style="margin:0px;line-height:200%;font-size:8pt;" xml:lang="en-us">Ulexite ( </span> </i> </span> <i> <span lang="en-us" style="margin:0px;line-height:200%;font-size:8pt;" xml:lang="en-us">Na <sub> <font face="Times New Roman" size="1">2 </font> </sub>O·2CaO·5B <sub> <font face="Times New Roman" size="1">2 </font> </sub>O <sub> <font face="Times New Roman" size="1">3 </font> </sub>·16H <sub> <font face="Times New Roman" size="1">2 </font> </sub>O) <span style="margin:0px;"> is one of the most important raw materials for boric acid,
synthesized by dissolving the ore in an acid solution. Since ulexite ore was
dissolved in a phosphoric acid solution, the </span>final solution included <span style="margin:0px;">boric acid (H <sub> <font face="Times New Roman" size="1">3 </font> </sub>BO <sub> <font face="Times New Roman" size="1">3 </font> </sub>), </span> <span style="margin:0px;">sodium
dihydrogen phosphate [NaH <sub> <font face="Times New Roman" size="1">2 </font> </sub>PO <sub> <font face="Times New Roman" size="1">4 </font> </sub>], </span> <span style="margin:0px;">and
calcium </span> <span style="margin:0px;">dihydrogen phosphate [Ca(H <sub> <font face="Times New Roman" size="1">2 </font> </sub>PO <sub> <font face="Times New Roman" size="1">4 </font> </sub>) <sub> <font face="Times New Roman" size="1">2 </font> </sub>] </span>. <span style="margin:0px;">The presence of several ions in the solution causes separation
problems for boric acid. This </span> <span style="margin:0px;">study </span> <span style="margin:0px;">includes a special separation step to increase the purity of the
boric </span> <span style="margin:0px;">acid </span>that is <span style="margin:0px;">synthesized
from the dissolution of ulexite ore in phosphoric acid. </span>For this
purpose, c <span style="margin:0px;">alcium </span> <span style="margin:0px;">ions in the </span>
final <span style="margin:0px;">solution were removed using </span> Dowex HCR-S cationic <span style="margin:0px;">ion </span> <span style="margin:0px;">exchange resin. Additionally, the Taguchi
optimization method was employed to monitor the removal of calcium ions </span>. <span style="margin:0px;">The </span> <span style="margin:0px;">design </span> <span style="margin:0px;">of
experiments </span> <span style="margin:0px;">included an </span>orthogonal array
technique in L <sub> <font face="Times New Roman" size="1">9 </font> </sub> array for three parameters with three different
values; reaction temperature (12 <sup> <font face="Times New Roman" size="1">o </font> </sup>C, 25 <sup> <font face="Times New Roman" size="1">o </font> </sup>C, 40 <sup> <font face="Times New Roman" size="1">o </font> </sup>C),
stirring rate (250 rpm, 300 rpm, 350 rpm), and the amount of resin material
(10% wt., 30% wt., 50% wt.). The results of the calculations revealed that the
optimum values of temperature, stirring rate, and amount of resin are 12 <sup> <font face="Times New Roman" size="1">o </font> </sup>C,
350 rpm, and 50% wt., respectively. The amount of calcium removed under optimum
conditions was found as 79.49%. </span> </i> </p>}, number={2}