폐알루미늄 분진으로부터 용도별 합성 Zeolite 제조 연구

다국어 초록 (Multilingual Abstract)

In this study, zeolite synthesis raw material was recovered as slag from waste aluminum dust using a dry melting process, and synthetic zeolite was manufactured using the recovered slag. The prepared zeolite was modified with various cations (Mg2+, Ca2+, K+) and then a comparative experiment on heavy metal removal rate was conducted. In addition, a comparison experiment of hard/soft water conversion ratio was conducted to evaluate the water hardness control performance of Na-Zeolite and K-Zeolite, which can be used to control water hardness. A comparative experiment was conducted according to the amount of carbon added for the dry melting process, and as a result of XRD analysis, it was confirmed that when 4g of carbon was added, the highest Al2O3 and SiO2 content and a single phase of mullite(Al6Si2O13) were formed. The zeolite synthesis process was conducted through comparative experiments depending on the concentration of NaOH, and as a result of XRD analysis, a 50wt.% NaOH solution in which Na-Zeolite was synthesized in the form of a single phase was derived as the optimal process condition. A comparative experiment was conducted on the heavy metal removal rates of the manufactured Na-Zeolite and Mg-Zeolite, Ca-Zeolite, and K-Zeolite converted through cation modification. Standard reagents for four heavy metals, Pb, Hg, Cr6+, and Cd, were prepared and heavy metal removal rate comparison experiments were conducted. The standard reagent was diluted with distilled water, and 5 g of zeolite was added to 50 ml of a 100 ppm concentration heavy metal solution and stirred at room temperature at a speed of 300 rpm for 30 minutes. After stirring, the concentration of heavy metals remaining in the solution was measured using ICP-OES analysis and the removal rate was calculated. In addition, a hard/soft water conversion rate evaluation experiment was conducted to confirm the water hardness control characteristics of Na-Zeolite and K-Zeolite prepared through Na-Zeolite cation modification. In order to confirm the hardness control characteristics of the prepared synthetic zeolite, a solution of 300ppm as CaCO3 or more was arbitrarily prepared and a hard/soft water conversion ratio comparison experiment was conducted. 5 g of K-Zeolite was added to 50 ml of prepared hard water and stirred for 30 minutes at room temperature at a speed of 300 rpm. After stirring was completed, the concentrations of Ca and Mg remaining in the solution were measured using ICP-OES analysis and the average value was calculated. As a result of the experiment, it was confirmed that Mg-Zeolite had the best heavy metal removal ability, and through the comparison test results of hard/soft water conversion rate, it was confirmed that K-Zeolite was more suitable for hard/soft water conversion than Na-Zeolite.

목차 (Table of Contents)

• Ⅰ. 서론 1
• 1.1 연구 배경 및 필요성 1
• Ⅱ. 이론적 배경 4
• 2.1 알루미늄 분진 4
• 2.1.1 알루미늄 분진의 정의 4
• 2.1.2 알루미늄 분진의 위험성 4
• 2.1.3 알루미늄 분진의 재활용 기술 5
• 2.1.3.1 철강용 Flux로 활용 6
• 2.1.3.2 시멘트 대체원료로 활용 6
• 2.2 제올라이트 7
• 2.2.1 제올라이트의 정의 7
• 2.2.2 제올라이트의 양이온 교환 특성 8
• 2.2.3 제올라이트의 흡착 및 분자체 특성 9
• 2.2.4 제올라이트의 촉매 특성 10
• 2.2.5 제올라이트의 탈수 및 재흡수 특성 11
• Ⅲ. 실험 재료 및 방법 12
• 3.1 개요 12
• 3.1.1 성분 분석 12
• 3.1.2 실험 장비 14
• 3.2 실험 방법 18
• 3.2.1 실험 목적 18
• 3.2.2 열역학적 메커니즘 분석 20
• 3.2.3 건식 용융 공정 22
• 3.2.4 합성 Na-Zeolite 제조 23
• 3.2.5 수세 및 건조 23
• 3.2.6 양이온 개질 24
• 3.2.7 중금속 제거율 비교 실험 24
• 3.2.8 경/연수 전환율 비교 실험 25
• Ⅳ. 실험 결과 및 고찰 26
• 4.1 건식 용융 공정 26
• 4.1.1 Carbon 첨가량 차이에 따른 상 변화 26
• 4.2 합성 Na-Zeolite 제조 29
• 4.2.1 NaOH 용액 농도 차이에 따른 상 변화 29
• 4.3 양이온 개질 32
• 4.4 중금속 제거율 비교 36
• 4.5 경/연수 전환율 비교 40
• Ⅴ. 결론 42
• Ⅵ. 참고문헌 44