[논문]폐 굴껍질 이용 침강성 탄산칼슘 제조에서 교반속도와 첨가제가 Vaterite 함유량에 미치는 영향

박영철

doi:10.7464/ksct.2023.29.2.95

폐 굴껍질 이용 침강성 탄산칼슘 제조에서 교반속도와 첨가제가 Vaterite 함유량에 미치는 영향
Effect of Agitation and Additive on the Vaterite Contents of Precipitated Calcium Carbonate from Oyster Shell Waste 원문보기

청정기술 = Clean technology, v.29 no.2, 2023년, pp.95 - 101

초록
AI-Helper

폐굴껍질을 원료로 vaterite 형 침강성 탄산칼슘 제조 실험을 하였다. 굴껍질을 800℃의 온도에서 산화칼슘이 주성분인 소성 굴껍질을 제조하였다. 이 굴껍질을 질산이나 염산 용액에 녹여 0.1 M 질산칼슘이나 염화칼슘 수용액을 만들고, 여러 실험 조건에서 0.1 M 탄산나트륨 수용액과 탄산화 반응을 시켰다. 실험 조건은 aspatic acid 첨가량, 반응온도, 교반속도, NH₄OH 첨가량, 반응시간, 용해 산 종류 등이다. XRD, SEM, Size 분석을 하고 vaterite 함유량을 계산하였다. 25℃, 600 rpm, aspatic acid 0.1몰/ 1몰 CaO과 2 cm³의 NH₄OH를 첨가한 최적 조건에서 1시간 반응에서 vaterite 함유량 95.9%의 구형의 침강성 탄산칼슘을 합성하였다. 평균 입경은 12.11 ㎛이었다. 고 vaterite 함유 탄산칼슘은 의료용, 식용, 잉크첨가제 등 고부가가치 탄산칼슘으로 활용된다.

Abstract ▼ AI-Helper

An experiment was conducted to produce vaterite-type precipitated calcium carbonate from waste oyster shells in order to use them as recyclable resources. Calcined oyster shells containing calcium oxide as their main component were prepared at a temperature of 800℃ for 24 h. The oyster shells were dissolved in nitric acid or hydrochloric acid solution to make 0.1 M calcium nitrate or calcium chloride aqueous solution, and a carbonation reaction was performed using a 0.1 M sodium carbonate aqueous solution under various experimental conditions, which included varying the amount of aspatic acid additive, the amount of NH4OH added, the reaction time, the reaction temperature, the stirring speed, and the type of dissolved acid. The XRD, SEM, and size distributions were analyzed and the vaterite content was calculated. Spherical precipitated calcium carbonate with a vaterite content of 95.9% was synthesized by adding 0.1 mol aspatic acid/1 mol CaO and 2 cm3 of NH4OH, and reacting for 1 h at 25℃ while stirring at 600 rpm. The average particle diameter was found to be 12.11 ㎛. Calcium carbonate contatining high vaterite is used as high value added calcium carbonate for medical, food, inke additiver, etc.

주제어

표/그림 (11)

그림 Figure 1. SEM image of precipitated calcium carbonate formed from oyster shell (with 0.1 mol aspatic acid(A^s)/1 mol CaO).
그림 Figure 2. XRD pattern of precipitated calcium carbonate formed from oyster shell (with 0.1 mol aspatic acid/1 mol CaO).
표 Table 1. XRD pattern analysis of precipitated calcium carbonate
그림 Figure 3. The change of pH with reaction time by adding NH₄OH. reagents.
그림 Figure 4. The change of vaterite contents (X_sV) by adding NH₄OH.
그림 Figure 5. The change of vaterite contents (X_sV) by additive amounts.
그림 Figure 6. The change of vaterite contents (X_sV) by reaction time.
그림 Figure 7. The change of vaterite contents (X_sV) by mixing number.
그림 Figure 8. The change of vaterite contents (X_sV) by reaction temperature.
그림 Figure 9. Size distribution of precipitated calcium carbonate formed from oyster shell (with 0.1 mol aspatic acid/1 mol CaO).
그림 Figure 10. The change of size distribution by acid.

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상세보기
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상세보기
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상세보기
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