건식 용융환원을 통한 폐 알루미늄분진으로부터 합성 제올라이트 제조 연구

Abstract

Abstract This study conducted a study on the production of synthetic zeolite from waste aluminum dust through dry melt reduction. The sample used in the study used dust generated by domestic aluminum processing companies. 100g of aluminum dust, 70g of SiO2 and 5g of carbon were added with flux to melt-reduce at 1,600°C, and a graphite crucible was used as the crucible. Melting reduction was performed while Ar 300cc/min was injected. The reduced metal was recovered in the form of metal, and SiO2 and Al2O3 as zeolite synthesis raw materials were recovered with molten slag. The specific gravity difference between the reduced metal and the molten slag was used to separate the metal. A zeolite synthesis process using a NaOH solution was carried out from the reduction slag, and the synthesis reaction was carried out by mixing 10 g of the reduction slag and 50 wt.% NaOH solution with 50 ml. As a result of XRD analysis, Na-A type zeolite synthesis was confirmed under the conditions of reaction temperature of 90°C, reaction time of 24 hours, and 300 rpm. An experiment was conducted to remove four heavy metal solutions (Pb, Cd, Cr6+, Hg) using Zeolite LTA of the same phase as the produced aluminum dust zeolite. 50 ml of a 100 ppm heavy metal solution and 2g of synthetic zeolite were mixed and stirred at a speed of 300rpm for 10, 30, 60, 90, and 120 minutes. The concentration of the solution before and after stirring was analyzed by ICP-OES. Similar removal rates were confirmed for both zeolite, and it was confirmed that a raw material for zeolite recovered from waste aluminum dust could be used as a synthetic zeolite raw material.