Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Selective Adsorption of Si(IV) onto Hydrotalcite from Alkali Leaching Solution of Black Dross

블랙드로스 알칼리 침출용액으로부터 hydrotalcite에 의한 규소(IV)의 선택적 흡착

  • Song, Si Jeong (Department of Advanced Materials Science & Engineering, Mokpo National University) ;
  • Lee, Man Seung (Department of Advanced Materials Science & Engineering, Mokpo National University)
  • Received : 2019.03.20
  • Accepted : 2019.04.19
  • Published : 2019.04.30
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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.

블랙드로스로부터 고순도 알루미나를 회수하기 위해 기계적 활성화 처리한 블랙드로스를 수산화나트륨용액으로 침출하면 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. Hydrotalcite의 소성과 농도 및 NaOH의 농도가 규소(IV)의 흡착에 미치는 영향을 조사하였다. 5 M의 수산화나트륨용액에서 규소(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 흡착은 Freundlich 등온흡착식과 잘 일치하였다.

Keywords

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Fig. 1. Schematic diagram of the silicate adsorption reaction by hydrotalcite.

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Fig. 2. Effect of calcination of HTC on the loading of Si(IV) in several NaOH concentrations. ([NaOH] = 2-6 M; [Aqueous] = Al(III) 13 g/L, Si(II) 0.15 g/L; [calcined HTC] = [uncalcined HTC] = 0.35 g/L)

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Fig. 3. Effect of calcined HTC concentration on the loading percentage of Al(III) and Si(IV).([NaOH] = 1.67 M; [Aqueous] = Al(III) 4.3 g/L, Si(II) 0.05 g/L; [calcined HTC] = 0.05-6 g/L)

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Fig. 4. Effect of calcined HTC concentration on the loading percentage of Al(III) and Si(IV). ([NaOH] = 0.83 M; [Aqueous] = Al(III) 2.2 g/L, Si(II) 0.025 g/L; [calcined HTC] = 0.05-6 g/L)

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Fig. 5. Effect of calcined HTC and NaOH concentration on the loading percentage of Al(III) and Si(IV). ([NaOH] = 5 M; [Aqueous] = Al(III) 13 g/L, Si(II) 0.15 g/L; ■ : diluted 3T, □ : diluted 6T, ● : diluted 12T, ○ : diluted 24T, ◆ : diluted 48T; [calcined HTC] = 0.05-6 g/L)

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Fig. 6. Adsorption amounts of Si(IV) on calcined hydrotalcite according to calcined HTC concentration and dilution. ([Aqueous] = Al(III) 13 g/L, Si(II) 0.15 g/L; ■ : diluted 3T, □ : diluted 6T, ● : diluted 12T, ○ : diluted 24T, ◆ : diluted 48T; [calcined HTC] = 0.05- 6 g/L)

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Fig. 7. Effect of calcined HTC concentration on solution pH. ([NaOH] = 1.67 M; [Aqueous] = Al(III) 4.3 g/L, Si(II) 0.05 g/L; [calcined HTC] = 0.05-6 g/L)

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Fig. 8. Effect of calcined HTC concentration on solution pH. ([NaOH] = 5 M; [Aqueous] = Al(III) 13 g/L, Si(II) 0.15 g/L; ■ : diluted 3T, □ : diluted 6T, ● : diluted 12T, ○ : diluted 24T, ◆ : diluted 48T; [calcined HTC] = 0.05-6 g/L)

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Fig. 9. Plots of linearized Freundlich adsorption isotherm for the loading of Si(IV) onto calcined HTC. ([NaOH] = 5 M; [Aqueous] = Al(III) 13 g/L, Si(II) 0.15 g/L; ■ : diluted 3T, □ : diluted 6T, ● : diluted 12T, ○ : diluted 24T, ◆ : diluted 48T; [calcined HTC] = 0.05- 6 g/L)

Table 1. Variation of chemical composition of the solution with dilution

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Table 2. Freundlich isotherm data for the adsorption of silica(IV) using calcined HTC

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