블랙드로스 알칼리 침출용액으로부터 hydrotalcite에 의한 규소(IV)의 선택적 흡착
Selective Adsorption of Si(IV) onto Hydrotalcite from Alkali Leaching Solution of Black Dross
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초록
블랙드로스로부터 고순도 알루미나를 회수하기 위해 기계적 활성화 처리한 블랙드로스를 수산화나트륨용액으로침출하면 미량의 규소(IV)가 함유된 알루미네이트 용액을 얻을 수 있다. 본 연구에서는 hydrotalcite를 사용하여 알루미늄(III)과 규소(IV)의 농도가 각각 13000과 150 mg/L인 5 M의 수산화나트륨용액에서 규소(IV)의 선택적 흡착거동에 대하여 조사했다. Hydrotalcite는 수산화나트륨용액으로부터 규소(IV)만을 선택적으로 흡착하였다. Hydrotalcite 의 소성과 농도 및 NaOH의 농도가 규소(IV)의 흡착에 미치는 영향을 조사하였다. 5 M의 수산화나트륨용액에서규소(IV)의 흡착률은 낮으나 물로 48배 희석하여 소성한 hydrotalcite의 농도가 4.5 g/L 이상인 조건에서 규소(IV) 를 대부분 흡착시켜 고순도 알루미나용액을 회수할 수 있었다. 소성한 hydrotalcite에서 규소(IV)의 흡착은Freundlich 등온흡착식과 잘 일치하였다.
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.
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