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Synthesis of pure potassium pentaborate (KB5) from potassium dihydrogen phosphate (KH2PO4) and colemanite

Özlem Karagöz and Soner Kuşlu

Department of Chemical Engineering, Atatürk University, Erzurum, Turkey

 

E-mail: ozlemkaragoz@atauni.edu.tr

Received: 11 May 2021  Accepted: 30 June 2021

Abstract:

In this study, after specifying theoretical reaction conditions required for the chemical reaction, potassium pentaborate (KB5) was synthesized from the potassium dihydrogen phosphate (\({\text{KH}}_{2} {\text{PO}}_{4}\)) solution and raw colemanite (\({\text{Ca}}_{2} {\text{B}}_{6} {\text{O}}_{{11}} \cdot 5{\text{H}}_{2} {\text{O}}\)) ore. The slow evaporation solution method was used at 25 °C. The effect of time (6–18 h) on crystallization was studied. Synthesized minerals were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), RAMAN spectroscopy, and scanning electron microscopy (SEM). The results according to XRD, FT-IR, RAMAN, and SEM analyses proved that the synthesized product was potassium pentaborate (\({\text{KB}}_{5} {\text{O}}_{8} \cdot 4{\text{H}}_{2} {\text{O}}\)) mineral with ICSD: 96-026-1927 pdf code. As a result, the cost was reduced by using raw boron ore, colemanite, and KB5 was obtained in a shorter time and at a lower temperature.

Keywords: Potassium dihydrogen phosphate; Potassium pentaborate; Colemanite; Crystallization; Slow evaporation solution method; Optimization

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01771-z

 

Chemical Papers 75 (11) 5963–5969 (2021)

Friday, March 29, 2024

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