블랙드로스에 함유된 알루미나를 회수하기 위해 볼밀처리가 염산침출에 미치는 영향을 조사하였다. 볼밀처리 시간과 회전속도는 알루미나 침출에 큰 영향을 미치지 않았다. 최적의 볼밀처리(1시간, 700 rpm)에서 알루미나 침출은 침출시간과 온도에 영향을 받았다. 본 논문의 실험조건에서 산화마그네슘은 모두 용해되었으며, 칼륨, 철, 실리콘과 타이타늄 산화물은 일부만 용해되었다. 알루미나는 80% 정도 침출되었지만 상기 산화물이 미량 용해되므로 순수한 알루미나용액을 회수하기 위해서는 분리공정의 도입이 필요하다.
블랙드로스에 함유된 알루미나를 회수하기 위해 볼밀처리가 염산침출에 미치는 영향을 조사하였다. 볼밀처리 시간과 회전속도는 알루미나 침출에 큰 영향을 미치지 않았다. 최적의 볼밀처리(1시간, 700 rpm)에서 알루미나 침출은 침출시간과 온도에 영향을 받았다. 본 논문의 실험조건에서 산화마그네슘은 모두 용해되었으며, 칼륨, 철, 실리콘과 타이타늄 산화물은 일부만 용해되었다. 알루미나는 80% 정도 침출되었지만 상기 산화물이 미량 용해되므로 순수한 알루미나용액을 회수하기 위해서는 분리공정의 도입이 필요하다.
Effect of ball milling treatment on the hydrochloric acid leaching performance of black dross was investigated to recover alumina. Ball milling time and speed showed limited effect on the leaching behavior of the alumina in the mechanically dross. Under the optimum mechanical activation condition (f...
Effect of ball milling treatment on the hydrochloric acid leaching performance of black dross was investigated to recover alumina. Ball milling time and speed showed limited effect on the leaching behavior of the alumina in the mechanically dross. Under the optimum mechanical activation condition (for 1h at 700 rpm), the leaching of alumina in hydrochloric acid solution was significantly affected by leaching time and reaction temperature. MgO was completely dissolved in most of the leaching conditions, while a small amount of Ca, Fe, Si and Ti oxides was dissolved. Although 80% of alumina was dissolved, the dissolved minor components such as Ca, Fe, Mg, Si and Ti oxides should be separated to recover pure alumina solution.
Effect of ball milling treatment on the hydrochloric acid leaching performance of black dross was investigated to recover alumina. Ball milling time and speed showed limited effect on the leaching behavior of the alumina in the mechanically dross. Under the optimum mechanical activation condition (for 1h at 700 rpm), the leaching of alumina in hydrochloric acid solution was significantly affected by leaching time and reaction temperature. MgO was completely dissolved in most of the leaching conditions, while a small amount of Ca, Fe, Si and Ti oxides was dissolved. Although 80% of alumina was dissolved, the dissolved minor components such as Ca, Fe, Mg, Si and Ti oxides should be separated to recover pure alumina solution.
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제안 방법
In fact, little information has been reported on the leaching of the oxides from mechanically activated black dross using hydrochloric acid solution. In order to compare the leaching behavior of mechanically activated black dross between NaOH and HCl solution, ball milling treatment followed by HCl leaching was investigated in this work. For this purpose, the effect of ball milling time and speed on the leaching behavior of the oxides was investigated.
In order to investigate the effect of HCl concentration on the leaching of the oxides from the black dross mechanically activated for 1 h at 700 rpm, a series of leaching experiments were performed by varying HCl concentration from 1 to 7 M for 2 h at 50℃. In these experiments, the pulp density was kept at 20 g/L.
. In order to investigate the effect of ball milling time on leaching behavior of the oxides in black dross, ball milling time was varied from 1 h to 10 h and then the mechanically activated black dross was leached using 3 M HCl solution at 50℃ for 2h at a stirring speed of 200 rpm. The leaching percentage of the oxides from the unactivated and mechanically activated black dross is shown in Fig.
In order to recover alumina from black dross, a combined process consisting of ball milling treatment and HCl leaching was investigated. Ball milling time and speed did not show a significant effect on the leaching behavior of the oxides in black dross but the filterability was improved.
A vertical planetary ball mill (Fritsch Pulverisette 7 Bead Mill) with a rotation speed up to 800 rpm was employed in the ball milling treatment of the black dross after water treatment. Mechanically activated samples were prepared as follows: 8 g of the black dross was added into a vessel containing 40 g agate balls (a ball of 6 mm in diameter) with the weight ratio of ball/black dross of 5:1 and then milled for 1, 3, 5, 7 and 10 h at the milling speed of 400 rpm. In the case of effect of milling speed, the samples were milled at 250, 400, 550 and 700 rpm for 1h at the ball to powder weight ratio of 5:1.
후속연구
The filterability of the slurries after leaching was accelerated from 120 min to 20 min as milling time increased from zero to 10h. Therefore, mechanical activation of the black dross for 1h was selected for further experiments on the basis of the easy filterability and low leaching percentage of silica.
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