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http://dx.doi.org/10.4191/KCERS.2004.41.10.756

Studies on Preparation of Boron Compounds from Colemanite Ore : Preparation of Boric Acid and Reaction Mechanism (I)  

Choi, Byung-Hyun (Korea Institute of Ceramic Engineering and Technology)
Lim, Hyung-Mi (Korea Institute of Ceramic Engineering and Technology)
Jee, Mi-Jung (Korea Institute of Ceramic Engineering and Technology)
Jang, Jae-Hun (Korea Institute of Ceramic Engineering and Technology)
Paik, Song-Hoo (Korea Institute of Ceramic Engineering and Technology)
Lee, Mi-Jai (Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.41, no.10, 2004 , pp. 756-765 More about this Journal
Abstract
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.
Keywords
Colemanite; Borate; Bolic acid; Boron compounds; Extraction; Extraction mechanism;
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  • Reference
1 T. Kendall, 'Borate Supply and Demand,' Industrial MineraIs, (1997)
2 P. W. Harben and M. Kuzvart, 'A Global Geology,' Industrial Minerals Information, London, UK 59-73 (1996)
3 R. Thompson, 'The Boron Products Industry,' Proc Commons Mining Met Congr. 9th, 565-71 (1970)
4 L. L. Y. Chang, 'Borax and Borates,' Industrial Mineralogy(Materials, Processes and Uses), 62-77 (2000)
5 E. Cetin, I. Eroglu, and S. Ozkar, 'Kinetics ot Gypsum Formation and Growth During the Dissolution of Colemamte in Sulfuric Acid,' J. Cryst. Growth, 231 [4] 559-67 (2001)   DOI   ScienceOn
6 S. I. Sallay, U.P., 4,196,177, 'Process for Producing Boron Compounds from Borate Ores,' USA (1978)
7 J. Polendo-Loredo, U.S., 4,804,524, 'Process for the Preparation of Boric Acid from Colemanite and/or Howlite Minerals,' Monterrey, Mexico (1988)
8 M. Yesilyurt, 'Determination of Optimum Conditions for the Boric Acid Extraction Engineering and Processing,'Chem. Eng. Proc., publishing (2003)
9 O. Yildizm, 'The Effect of Heat Treatment on Colemanite Processing : A Ceramics Application,' Powder TechiwIogy, 142 [1] 7-12 (2004)   DOI   ScienceOn
10 S. H. Park, 'An Experiment Plan Method of Today,'Minyungsa, 2nd Ed. (2003)
11 A. R. Khoei, I. Masters, and D. T. Gethin, 'Design Opti- mization of Aluminum Recycling Processes Using TaguchiTechnique,' J. Mater. Pmcess. Tech., 127 [1] 96-106 (2002)   DOI   ScienceOn
12 T. H. Brown, 'Chemistry,' Nokmundang (2002)