Kaolin Samples Research Articles

EXTRACTION OF PURE ALUMINA FROM KAOLIN: A REVIEW

This study demonstrated that high-purity alumina can be generated from kaolin using various methods. It examined different leaching techniques, considering the size and percentage recovery of alumina by weight in selected kaolin samples, the calcination temperature, and the molar concentration of acids over time. Additionally, it analyzed the characteristics of several kaolin sources in Nigeria with the aim of extracting alumina. The research indicates that Nigerian kaolinite clay typically contains 22–40% alumina by weight. However, leaching kaolin yielded alumina with a purity of 60–97 wt%, with particle sizes ranging from 16 to 177 nm. Alumina derived from kaolin is deemed beneficial for manufacturing refractory materials, water purification, and biomedical applications.

Mineralogical Characterization and Geochemical Signatures of Supergene Kaolinitic Clay Deposits: Insight of Ropp Complex Kaolins, Northcentral Nigeria

This study presents the chemical and mineralogical composition of clay deposits and associated rock types within the Ropp Complex in order to assess the influence of parent lithology on the kaolinization, genesis, and utility of the deposit. Representative kaolin samples from E horizons of the weathering profiles and their bedrocks were collected from six sites in the Ropp Complex. Clay mineralogy was determined via the XRD technique, while a geochemical analysis was conducted using XRF, SEM coupled with EDS, and ICP-MS. The results showed that all kaolins dominantly contain kaolinite with a content of 77%–98% except for the AS1 kaolin with only minor kaolinite (20%) but mainly illite (65%). The notably lower crystallinity of kaolinite (HI value of 0.53–1.1) as well as its markedly small grain size is consistent with the formation of kaolinite from intensive chemical weathering of igneous rocks. The AS1 kaolin was probably formed from hydrothermal alteration in the burial stage due to the heating of groundwater by the late volcanism. Mobile trace elements (Sr, Ba, and Eu) exhibited a depletion trend, while immobile elements (Hf, Ta, Th) showed enrichment. The relatively more zirconium in kaolins implies the formation of low-temperature kaolinization. The notably high kaolinite content, accompanied by reasonable levels of Fe2O3 and TiO2, signifies a medium-grade quality. Furthermore, chondrite-normalized rare earth element (REE) patterns exhibit congruent trends in rocks and kaolin samples, indicating a relative enrichment in light rare earth elements (LREEs) alongside a discernible negative Eu anomaly. The abundant kaolinite and silicon–aluminum composition make the kaolins suitable for refractories, pharmaceutics, cosmetics, and supplementary cementitious material (SCM).

On the influence of the shearing rate on the monotonic and cyclic response of Malaysian kaolin

This paper experimentally evaluates the influence of shearing rate on the monotonic and cyclic response of isotropically consolidated samples of Malaysian kaolin. On the one hand, a series of undrained monotonic triaxial tests were performed with varying shearing displacement rate. On the other hand, undrained cyclic triaxial tests were conducted considering different deviatoric stress amplitudes and loading frequencies. The well-known soil rate dependency under monotonic loading was confirmed up to a displacement rate threshold. The experimental results under cyclic loading suggest that for the given loading frequency, the variation of the deviatoric stress amplitude remarkably influences the strains and pore water pressure accumulation rates. In addition, the results suggest that, depending on the loading frequency, different shapes of mobilised effective stress loops are obtained. Larger loading frequencies lead to banana-shaped effective stress loops, while smaller frequencies reproduce eight-shaped effective stress loops. Furthermore, higher loading frequencies result in a larger number of cycles required to reach failure conditions. The reasons for the observed differences in the behaviour are thoroughly analysed and discussed.

Evaluation of the strength performance and microstructural properties of different based metakaolin blended cements containing greenly synthesized nanosilica

The drive towards improving the properties of cement composite thus making it eco-friendly, sustainable, and durable, has been the focus of the construction industry. Kaolin is one of the pozzolans that have been investigated in recent times, but its reactivity is influenced by its source. In addition, the problem of homogenous mixing onsite and early strength development of pozzolana blended cement are evident. This research focused on the strength and microstructural properties of factory-produced metakaolin blended cement incorporated with green nanosilica. Kaolin samples were obtained from three locations and calcinated at 700 ℃ for 1 h. Metakaolin was interground with 10% Portland Limestone Cement (PLC) clinker at the factory. Binder-sand ratio (1:3) with a water-binder ratio of 0.5 was adopted for batching the mortar. Nanosilica was added to the mortar at: 1, 2, 3, 4, and 5%, respectively. Prisms of 40 × 40 × 160 mm were cast and cured for 3, 7, 14, 28, 56, 90, 180, 270, and 365 days, respectively. The flexural and compressive strengths of prisms including the water absorption of cubes were evaluated. 10% MK addition enhanced the mechanical properties of the mortar with MK C having the highest enhancement. Incorporation of 1% nanosilica enhanced strengths at early and later ages, as well as refinement in the pores of the mortar with increasing nanosilica.

Mineralogy, geochemistry, origin, and potential industrial applications of kaolin deposit from Hassi Abyad, Mauritania

The Hassi Abyad kaolin deposit is in the southern part of Mauritania, around 45 km east of the town of M'Bout. Hassi Abyad lies in the middle of the Mauritanides Shield, which consists of deformed and metamorphosed Precambrian and Paleozoic formations. Complementary geological, mineralogical, and geochemical studies have been carried out to help answer questions linked to the origin of these kaolin and to determine the potential suitability for different industrial applications. The mineralogical compositions showed that Hassi Abyad kaolin is mainly composed of kaolinite (61–96%) and other minerals such as chlorite, illite, muscovite, cronstedtite, quartz, rutile, magnetite, laumontite, and gibbsite. The average chemical composition of the kaolin samples is 35.84% Al₂O₃, 45.27% SiO₂, and 14.19% LOI. Other oxides occur in low concentrations (less than1%). The higher chemical indices of alteration CIA (99.5%) and CIW (99.6%) indicate that this kaolin deposit underwent a high degree of alteration during the process of kaolinization of the source rock. The absence of high temperature minerals such as pyrite, topaz and dickite, and the presence of high Ce + Y + La and Cr + Nb contents signifies that the development and evolution of this deposit are affiliated with supergene processes. This kaolin is derived from a lateritic material, proving that they are the source rock of this deposit. The geochemical and mineralogical characteristics indicate that Hassi Abyad kaolin is applicable in ceramics, paper, cosmetics, pharmaceutics, bricks making, and pottery.

Preparation of Geopolymeric Materials from Industrial Kaolins, with Variable Kaolinite Content and Alkali Silicates Precursors.

In the present work, the development of geopolymeric materials with Na or K based on industrial kaolin samples, with variable kaolinite content and alkaline silicates, is studied. XRF, XRD, FTIR and SEM-EDS have been used as characterization techniques. Three ceramic kaolin samples, two from Algeria and one from Charente (France), have been considered. In particular, chemical and mineralogical characterization revealed elements distinct of Si and Al, and the content of pure kaolinite and secondary minerals. Metakaolinite was obtained by grinding and sieving raw kaolin at 80 μm and then by thermal activation at 750 °C for 1 h. This metakaolinite has been used as a base raw material to obtain geopolymers, using for this purpose different formulations of alkaline silicates with NaOH or KOH and variable Si/K molar ratios. The formation of geopolymeric materials by hydroxylation and polycondensation characterized with different Si/Al molar ratios, depending on the original metakaolinite content, has been demonstrated. Sodium carbonates have been detected by XRD and FTIR, and confirmed by SEM-EDS, in two of these geopolymer materials being products of NaOH carbonation.

Undrained shear strength of soft clay reinforced with encapsulated stone dust columns

PurposeThe stone dust column was used to strengthen the sample and had a significant effect on improving the shear strength of the kaolin clay. The application of stone columns, which can improve the overall carrying capacity of soft clay as well as lessen the settlement of buildings built on it, is among the most widespread ground improvement techniques throughout the globe. The performance of foundation beds is enhanced by their stiffness values and higher strength, which could withstand more of the load applied. Stone dust is a wonderful source containing micronutrients for soil, particularly those derived from basalt, volcanic rock, granite and other related rocks. The aim of this paper is to evaluate the properties of soft clay reinforced with encapsulated stone dust columns to remediate problematic soil and obtain a more affordable and environmentally friendly way than using other materials.Design/methodology/approachIn this study, the treated kaolin sample's shear strength was measured using the unconfined compression test (UCT). 28 batches of soil samples total, 12 batches of single stone dust columns measuring 10 mm in diameter and 12 batches of single stone dust columns measuring 16 mm in diameter. Four batches of control samples are also included. At heights of 60 mm, 80 mm and 100 mm, respectively, various stone dust column diameters were assessed. The real soil sample has a diameter of 50 mm and a height of 100 mm.FindingsTest results show when kaolin is implanted with a single encased stone dust column that has an area replacement ratio of 10.24% and penetration ratios of 0.6, 0.8 and 1.0, the shear strength increase is 51.75%, 74.5% and 49.20%. The equivalent shear strength increases are 48.50%, 68.50% and 43.50% for soft soil treated with a 12.00% area replacement ratio and 0.6, 0.8 and 1.0 penetration ratios.Originality/valueThis study shows a comparison of how sample types affect shear strength. Also, this article provides argumentation behind the variation of soil strength obtained from different test types and gives recommendations for appropriate test methods for soft soil.

Kaolin from Poletaevskoye deposit (Chelyabinsk region, Russia) in ceramics production

The paper presents the results of a study of the properties of Poletaevsky kaolin with the aim of using it in the ceramic industry. Based on the results of determining the chemical, mineral and granulometric composition. The mineral composition of Poletaevsky kaolin is kaolinite 80–85 wt %, muscovite and illite 10–15 wt %, quartz up to 10–15 wt %. It has been established that the Hinckley index for Poletaevsky kaolin is 0.68, compared to 1.38 for Glukhovetsky one. The ratio of highly ordered kaolinite to low ordered kaolinite for Poletaevsky kaolin is 22 : 78, for Glukhovetsky kaolin the ratio of highly ordered kaolinite to low-ordered kaolinite is 57 : 43. It was established that Poletaevsky kaolin can be used in the production of ceramic materials by plastic or semi-dry molding. The determined low content of high-ordered kaolinite and the insignificant content of particles less than 2 μm according to the results of laser diffraction analysis can lead to the production of an unstable slip. When firing samples of Poletaevsky kaolin, a minimum water absorption of 5.5 % was achieved at a firing temperature of 1450 °C. In this case, the resulting maximum apparent density was 2.17 g/cm3, the maximum mullite content was 38 %, and the maximum compressive strength was 32 MPa.

Discussion on “Dispersion characteristics of clayey soils containing waste rubber particles” [J Rock Mech Geotech Eng 15 (2023) 3050–3058]

We read with great interest the recent article by Erenson (2023)entitled “Dispersion characteristics of clayey soils containing waste rubber particles”. The author has studied the dispersion characteristics of clayey soils containing different percentages of waste rubber particles (WRPs) by performing several tests (viz. consistency limit, linear shrinkage limit, double hydrometer, crumb test and pinhole test) and scanning electron microscopy (SEM) analysis on five clayey (viz. Na-activated bentonite, refined ball clay, Ukrainian kaolin, Avanos kaolin and Afyon clay) samples containing 0%, 5%, 10% and 15% WRPs. It should be noted that Erenson (2023) has presented some interesting observations, but there are some serious issues that we want to share through this discussion and request the author of the original paper to address them to avoid their persistence in the scientific literature.

Radiological Safety Assessment of Tailings Extracted from Kaolin Mining Sites in Katsina State

This research was carried out to sufficiently justify the recent increased awareness and concern for the potential hazards associated NORMs in the environment of the research around Kankara and Dutsin-ma Kaolin mining sites Katsina State; Nine (09) Kaolin samples were collected randomly from the mining sites for the study. The radioactivity analysis was done experimentally using NaI(TI) gamma spectrometer at Center for energy research and training, Ahmadu Bello University Zaria. The health hazards were evaluated using numerous radiological, Statistical and USEPA models. The overall hazard index (HI) was found to be 1.496609 for children found in third sampling point of Yar-goje are; it is the only possibility of a children to be affected while 0.799486 for adults, this value was below the USEPA threshold limit for non-carcinogenic risks of 1.0 indicating that the exposed population ages are unlikely to experience any adverse non-carcinogenic risks. The radiological parameters obtained are 226Ra (238U), 232Th and 40K of a NORMs with activity concentration of is 100.889, 0.129 and 224.040 (Bqkg-1) in the soil samples, at the studied area. Absorbed frequency in air measured in nGy/h by one-meter directly above the crushed, was considered, since the forbidding radioactivity concentrations is obtained as 77.575 while the total annual effective dose (AED) in mSv/y had average value of 0.099 in soil. The values obtained for external and internal radiological hazard indices Hext and Hint are 0.471 and 0.741 in soil; which were lower than the UNSCEAR suggested boundary limit of unity. Lastly, the overall excess lifetime cancer menace owed to NORMs, stood as 5.63E-06 and 4.15E-06 for whole populations indicating that (a maximum of 6 people/1 million may be affected) for adults while (a maximum of 4 people /1 million may be affected) for children. These values were within the USEPA threshold of 1E-04.

On the effect of thermal activation on the surface chemistry of natural mineral sorbents

The article discusses adsorbents, their characteristic features, structural sizes, geometric forms, porosity, the concept of porosity and the influence of their thermal activation on the structure and sorption parameters of natural mineral sorbents - Angren kaolin and Azkamar bentonite. Here is given the chemical composition of kaolin and bentonite clay samples before and after thermal activation. Thermal activation of kaolin clay at 1023K is shown, which has almost no effect on the content of basic oxides in the clay mineral. It leads to the removal of adsorbed moisture and partially constitutional water, as a result of which the mass loss on ignition (WLP) of a thermally activated kaolin clay sample is reduced. The adsorption isotherms of water vapor on thermally activated samples of kaolin and bentonite have an S-shape according to the BET classification, which is due to capillary condensation in the P/P-1.0 region. All isotherms are characterized by the presence of a hysteresis loop over the entire range of relative pressures. The reason for the appearance of a hysteresis loop in the case of sorption of water vapor is associated with the swelling of clays in the vapor phase. The change in the chemical composition of the initial and clays activated at 1023K is shown in the form of a table. Based on the research, it was concluded that during thermal activation of PMS, processes associated with dehydration and dehydroxylation occur, which leads to changes in porosity, specific gravity, and total pore volume.

Characterization and treatment effects on Mutaka kaolin for additive in coatings: Mineral composition, thermal and structural modifications

Previous studies in Uganda have primarily explored kaolin's applications in composites, pottery, bricks, and insulation, neglecting its potential for coatings and paints, which is crucial for industrialization and saving foreign exchange. This study investigates the transformation of kaolin through various treatments and analyzes their impacts on its physical and chemical properties for potential use in coating applications. Thermal analysis, X-ray Fluorescence Spectroscopy (XRF), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), and transmission electron microscopy (TEM) techniques were employed to assess these alterations. The results show that thermal treatment of kaolin at 45.9 °C had minimal impact on mass loss, while the crystallinity of kaolinite was found to be lost around 600 °C, resulting in structural changes. XRF result demonstrates variations in SiO2 and Al2O3 composition, with low TiO2 content desirable for paint and coating applications. XRD results showed well-defined diffractions associated with kaolinite in all treated and untreated kaolin samples. The presence of K-feldspar and quartz are also identified. However, the thermal treatment at 800 °C transforms kaolinite into metakaolin, essential for enhancing coating properties. SEM-EDS results indicate increased porosity and reduced impurities in the thermal-treated sample, which might enhance the whiteness and suitability of pigment and binder dispersion in coatings. TEM images confirmed the hexagonal nature of kaolinite platelets and demonstrated the amorphous nature of kaolin nanoparticles with ammonium molybdate treatment, which led to the delamination and exfoliation of kaolinite layers, improving dispersibility. Kaolin thermally treated exhibited good crystallinity, solid growth, cubic morphology, and uniform size distribution. These findings suggest that tailored treatments can optimize kaolin's properties, making it a promising additive for high-performance coatings.

INVESTIGATION OF LINEAR AND MASS ATTENUATION COEFFICIENT OF OZANOGOGO KAOLIN, AGBOR, DELTA STATE

This study investigates the linear and mass attenuation coefficients of Ozanogogo Kaolin, a material with unique physical and chemical properties, across varying radiation energies. The study aims to contribute to understanding how Ozanogogo Kaolin interacts with radiation, particularly in fields such as medical imaging, radiation therapy, and industrial applications. The research thoroughly explores the material's characteristics, including density, thermal stability, corrosion resistance, and mechanical strength. The linear attenuation coefficient (μ) and mass attenuation coefficient (μ/ρ) are fundamental parameters measured experimentally through a transmission-based technique. The experimental setup includes a radiation source, Ozanogogo Kaolin samples, a radiation detector, and appropriate shielding. The values of attenuation coefficients obtained at different radiation energies are presented, indicating a linear decrease in attenuation with increasing energy. The research discusses the implications of the findings for practical applications, emphasizing Ozanogogo Kaolin's potential in radiation shielding materials and protective equipment. Possible sources of error in the experimental procedure are identified, and recommendations for future research are proposed, including investigations into sample characteristics, comparative studies with other shielding materials, and examinations of material behaviour at higher energies. In conclusion, this study enhances the understanding of Ozanogogo Kaolin's attenuation properties and highlights its potential in diverse applications related to radiation attenuation. The research findings contribute valuable insights for developing improved radiation shielding materials and equipment.

Characterization of Kaolin Deposits in Kutigi, Niger State, Northern Nigeria

Kaolinite is among the most important mineral resource of kaolin clay sample with numerous industrial applications. Its effective characterization in terms of its chemical composition, structure and thermal properties is important for streamline it specific industrial application. In this study, the mineralogical, thermal properties, surface morphology, surface area, structural functional groups and chemical compositions were determined using the X-ray diffraction (XRD), thermogravimetry analyser, scanning electron microscope (SEM), nitrogen adsorption-desorption BET, Fourier transform infrared spectroscopy (FTIR) and X-ray fluorescence (XRF) method. The major phases in the kaolin clay samples was the kaolinite with quartz, orthoclase, and albite as minor phases. the kaolin sample loss in weight was due to dihydroxylation. The kaolin particles were made of agglomeration of its irregular sized particles. The BET surface area of kaolin sample was 181.549 m2/g, with particle size of 2.98 nm and pore volume of 0.161 cc/g. The FTIR spectra showed presence of peaks for Si-O at positions 2359.48,1217.35, 1032.21, and 753.55 cm-1, while the Al-O group appeared at 1365.84, 912.65 and 668.21 cm-1. Elemental composition content results from XRF showed that SiO2 was 34.25 wt %, Al2O3 was 28.16 wt % as the major content while the minor content such as Fe2O3, MgO, TiO2, CeO2, K2O and ZrO2 were 1.17, 1.63, 1.59, 0.95, 0.37, and 0.27 wt % respectively.

Enhanced dispersing properties of kaolin due to high-strength kneading process

In this study, the influence of high-strength kneading process on the dispersibility of kaolin was investigated. Various factors including crystallinity, shape and interaction energy of kaolin particles were investigated systematically based on XRD, SEM, FTIR, Zeta potential and DLVO analyses. The results showed that the high-strength kneading treatments increased the proportion of kaolinite (001) planes, reducing the friction between kaolin particles but increasing their crystallinity. In addition, this treatment promoted the tendency of kaolin to a pseudo-hexagonal shape. DLVO analyses further showed that the electrostatic repulsion energy between kaolin particles was proportional to the kneading time due to the increased specific surface area (e.g., increased from 14.63 to 18.24 m2·g−1) and negative charge value (e.g., decreased from −15 to −32 mV) of kaolin sample. This correspondingly led to a lower viscosity of kaolin pulp with better dispersing properties, e.g., the viscosity of kaolin samples decreased by 65.41% when kneading time was extended from 0 to 6 h. This study therefore provides a new strategy to reutilize kaolin sources with low dispersing properties and crystallinity after a high-strength kneading process.

Highly reactive metakaolin: a multi-parameter optimization by response surface methodology

Multi-parameter effect consideration during metakaolin conversion gives the best optimum processing conditions. Kaolin deposits have different properties, which makes it vital to establish optimum conditions for a distinctive kaolin deposit. The Response Surface Methodology under the Box-Behnken Design has been adopted in the current study to optimize the processing conditions for kaolin-to-metakaolin conversion. The temperature of 765 °C, the rate of 10 °C min−1, and 6.46 h of soaking were the optimum conditions for yielding the highly reactive (1382.15 mg Ca (OH)2/g) metakaolin. The kaolin sample’s distinctive reflections on two theta degrees at 14.32° and 29.03° proved that kaolinite was present. However, x-ray diffraction suggested that the optimized metakaolin was lacking those reflections. The Fourier-transformation infrared spectroscopy confirmed the presence of kaolinite in the sample with wave number range at the bands 3692, 3650, and 3620 cm−1, which disappeared to form a broad band in this region, which validates the formation of reactive amorphous metakaolin.

Natural Radionuclide Concentration in Kaolin Deposits and Dose Assessment Within Delta State, Nigeria

The assessment of natural radionuclide concentration in kaolin deposits and dose rate within Delta state, Nigeria has been carried out. Four kaolin mining sites within four Local Government Areas in the state were studied. Background Ionizing Radiation levels of each of the mining site was measured using a Gamma Scout handheld radiation meter and a GPS meter used to obtain the actual positions where the BIR levels were taken around each kaolin site. A total of twenty-five (25) samples were collected for Gamma spectrometry analysis at National Institute of Radiation Protection and Research, University of Ibadan. The mean BIR exposure rates for Ukwuani, Aniocha South, Ughelli North and Ughelli South LGAs were 0.01mRh -1 , 0.013mRh -1 , 0.013mRh -1 and 0.014mRh -1 respectively and were within the world’s recommended permissible limit of 0.013mRh -1 given by UNSCEAR. The mean activity concentrations of 238 U, 232 Th and 40 K in kaolin samples were estimated to be 137.028 ± 7.194, 13.532 ± 1.568 and 6.724 ± 0.396 Bqkg -1 respectively for Ukwuani; 425.494 ± 22.16, 18.63 ± 2.17 and 11.955 ± 0.71 Bqkg -1 respectively for Ughelli South; 596 ± 30.772, 18.728 ± 2.124 and 8.912 ± 0.526 Bqkg -1 respectively for Ughelli North and finally, 120.026 ± 6.235, 10.533 ± 1.182 and 15.024 ± 0.879 Bqkg -1 respectively for Aniocha South. These results compare quite well with the world’s average value of activity concentrations for natural radionuclides reported by UNSCEAR, except for 40 K which is higher than the world’s average at Ughelli North and South. The values of all the radiological hazard parameters for all the mining sites are less than the recommended limits. The calculated Excess Lifetime Cancer Risk also reveal that the values are all within the recommended limits, therefore, the risk of cancer inducement due to radiation exposure is within the acceptable limits for all the mining sites.

Comparison and Characterization Analysis of Locally Sourced Kaolin Samples for the Development of Zeolite Catalysts

Comparison and Characterization Analysis of Locally Sourced Kaolin Samples for the Development of Zeolite Catalysts

Effect of the particle’s shape on the dynamic shear modulus and compressibility of diatomaceous soils

Diatomites are unicellular algae fossils that can be found worldwide. This paper studies the diatom's shape effect on diatomaceous soil mixtures' dynamic and compressibility properties. Physical characteristics of six diatomite samples with variable shapes and taxonomies are presented. Among these six samples, three diatomites of similar grain size distribution were mixed with kaolin, and the mechanical properties (i.e., shear modulus and damping ratio from small to large strains) were analysed. The results showed that diatom frustules increased the mixtures' compressibility and reduced the maximum shear modulus compared with pure kaolin samples. Moreover, the diatom's shape influenced the normalised shear modulus degradation curve and the damping ratio. Overall, the presence of diatomites reduces the energy dissipation capacity in soils. This research evidenced the importance of distinguishing the shape of diatom in soil mixtures when mechanical properties are analysed, a situation that has yet to be explored.

Identification and quantification of soil water components in kaolin by thermogravimetric and kinetic analysis

Different types of soil water, such as bound water and capillary water, have distinct effects on the physicochemical and engineering properties of soils, particularly unsaturated clayey soils. Therefore, it is crucial to develop an accurate and physically meaningful experimental method for identifying and quantifying these components. This study pioneers the use of a multi-step kinetic model to identify and quantify different soil water components across a wide range of relative humidity (RH) using thermogravimetric analysis (TGA) data. To validate the determined kinetic parameters (i.e., activation energy, preexponential factor, and reaction model) and the identification and quantification results of soil water components, TGA with multiple heating rates, nitrogen adsorption method, cation exchange capacity measurement, and nuclear magnetic resonance (NMR) were performed on kaolin samples equilibrated under various RH conditions. These experimental results cross-validate the superior performance of the kinetic model in determining soil water components and predicting the thermal desorption behaviors of soil water. Based on the cross-validation results, the soil water components obtained from the kinetic analysis are further identified as tightly-bound, loosely-bound, and capillary water, which exhibit variations consistent with empirical soil water isotherm models. The T2 cutoff value between bound and capillary water is determined to be 1.79 ms based on TGA and NMR results. The determined thermal kinetic parameters of different soil water components can exhibit their distinct retention mechanisms. The method and results in this study provide a new perspective on identifying different soil water components, as well as understanding the mechanism of soil-water interactions in unsaturated soils.