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http://dx.doi.org/10.7844/kirr.2019.28.2.54

Selective Adsorption of Si(IV) onto Hydrotalcite from Alkali Leaching Solution of Black Dross  

Song, Si Jeong (Department of Advanced Materials Science & Engineering, Mokpo National University)
Lee, Man Seung (Department of Advanced Materials Science & Engineering, Mokpo National University)
Publication Information
Resources Recycling / v.28, no.2, 2019 , pp. 54-61 More about this Journal
Abstract
In order to recover pure alumina from black dross, leaching of mechanically activated black dross with NaOH solution resulted in an aluminate solution containing a small amount of Si(IV). Selective adsorption of Si(IV) onto hydrotalcite was investigated from 5 M NaOH solution where the concentration of Al(III) and Si(IV) was 13000 and 150 mg/L, respectively. Only Si(IV) was selectively loaded onto hydrotalcite, while Al(III) remained in the solution. Effect of the calcination treatment of hydrotalcite and concentration of calcined hydrotalcite and NaOH on the loading of Si(IV) was investigated. Although the loading percentage of Si(IV) was low from 5 M NaOH solution, most of the Si(IV) was removed by adjusting the concentration of NaOH by 48 times dilution with water when the concentration of calcined hydrotalcite was higher than 4.5 g/L. The loading of Si(IV) onto calcined hydrotalcite followed Freundlich adsorption isotherm.
Keywords
Silicon(IV); Aluminum(III); NaOH; Hydrotalcite; Adsorption;
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Times Cited By KSCI : 2  (Citation Analysis)
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