Preliminary Study on the Quantitative Analysis of Kaolinite based on Standard Mixed Samples

Nam-Il Kim; Jeong-Hoon Jo; Sang-Ser Goo; Yong-Seon Hwang

doi:10.7844/kirr.2025.34.6.29

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2025 Vol.34, Issue 6 Preview Page Next Page

Research Paper

Preliminary Study on the Quantitative Analysis of Kaolinite based on Standard Mixed Samples 표준 혼합 시료 기반 카올리나이트 정량 분석 기초 연구

31 December 2025. pp. 29-37

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Abstract

Herein, we evaluated the accuracies and limitations of kaolinite quantification methods using standard mixtures of highly pure kaolinite and ISO standard sand. Samples were subjected to thermogravimetric analysis (TGA) and X-ray diffractometry (XRD) with Rietveld refinement. TGA exhibited the highest accuracy, with an average error of 8.72% in the 450–750 °C dehydroxylation range, which indicates that this temperature range is suitable for quantifying kaolinite. In contrast, XRD exhibited high accuracies for single-phase samples but showed a higher average error of 10.31% for mixed samples owing to peak overlap among minerals. These findings confirm that single-method approaches are of limited reliability when applied to complex mixtures or natural clays containing multiple mineral phases. Therefore, integrating complementary techniques such as Fourier-transform infrared and X-ray fluorescence spectroscopies is essential for enhancing reliability and consistency during kaolinite quantification using a multi-method analytical framework.

Keywords

Kaolinite

Calcined clay

Thermogravimetric analysis

X-ray diffraction analysis

Rietveld quantitative analysis

본 연구에서는 고순도 카올리나이트와 ISO 표준사를 혼합한 표준 시료를 대상으로, 카올리나이트 함량 정량을 위한 TG 및 XRD 분석(Rietveld 정량법)의 정확성과 한계를 비교·평가하였다. TG 분석에서는 450–750℃의 탈수산화 온도 범위에서 평균 오차 8.72%로 가장 높은 정확도를 보였으며, 이는 카올리나이트 정량 분석에 적합한 온도 구간으로 판단된다. 반면, XRD 분석은 단일 성분 시료에서는 정확도가 높았으나 혼합 시료의 경우 광물 간 피크 중첩 현상으로 인해 평균 오차가 10.31%로 증가하는 한계를 나타냈다. 이로써 단일 분석 기법에 의존할 경우, 복합 시료나 천연 점토와 같이 다양한 광물이 공존하는 경우 정량 분석의 신뢰성이 낮아질 수 있음을 확인하였다. 따라서 FTIR, XRF 등의 다중 분석 기법을 병행하여 분석 결과를 상호 보완하는 통합적 접근이 필요하다.

키워드

카올리나이트

소성 점토

열중량 분석

X-선 회절

리트벨트 정량분석

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 34
No :6
Pages :29-37
Received Date : 2025-07-04
Revised Date : 2025-08-21; 2025-10-14
Accepted Date : 2025-10-14
DOI :https://doi.org/10.7844/kirr.2025.34.6.29

Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

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