| Colemanite 광물로부터 붕소화합물의 제조에 관한 연구 : 붕산제조 및 반응기구 (I) |
| 최병현, 임형미, 지미정, 장재훈, 백종후, 이미재 |
| 요업 기술원 |
| Studies on Preparation of Boron Compounds from Colemanite Ore : Preparation of Boric Acid and Reaction Mechanism (I) |
| Byung-Hyun Choi, Hyung-Mi Lim, Mi-Jung Jee, Jae-Hun Jang, Song-Hoo Paik, Mi-Jai Lee |
| Korea Institute of Ceramic Engineering and Technology |
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| ABSTRACT |
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We present extraction process and reaction mechanism of boric acid from one of calcium borate ores, colemanite by reaction with sulfuric acid. Colemanite has been fully decomposed under pH 5 with sufficiency amount of sulfuric acid, more than the amount stoichiometrically required. Calcium sulfate was separated out, leaving boron in the liquid phase after sulfuric acid addition. The extraction process of boric acid was affected by dissolution temperature and time, amount of sulfuric acid and ammonium sulfate, pH and a degree of concentration before recrystallization. The $SiO_2$ of the impurities which colemanite contains was insoluble so that it was separated out with calcium sulfate from liquid phase. The species of $CaO,;Al_2O_3,;Fe_2O_3,;MgO$ were remained in a liquid phase after reaction with sulfuric acid. These impurities were separated out by addition of ammonia to the liquid phase, funhermore, boric acid was produced by process of pH adjustments and acidification, concentration, and recrystallization. |
| Key words:
Colemanite, Borate, Bolic acid, Boron compounds, Extraction, Extraction mechanism |
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