The Development of Pigments Reflects Infrared Radiation from Gravel (Lateritic) Soils
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Abstract
This research aims to analyze pigments from lateritic soil to reflect infrared radiation. The lateritic soils used in this research were from Ban Wanghai, Mukdahan Thailand. The study started by analyzing the physical properties and chemical composition of the soil to develop the NIR reflective pigments. The lateritic soils were ground and reduced to sizes smaller than 45 millimeters, then were calcined at 900-1300 for 1 hour. The calcined pigments were characterized and observed by XRD and SEM, and infrared reflection was measured by use of a UV-Vis-NIR spectrophotometer. The results of the research have shown that highly reflective NIR pigments from the soil reflect about 70-80% of infrared radiation at 1000
calcined firing temperature. It was found that quartz and FeAl2O4 were the main constituents. The particle size shows that the highest NIR reflectance is around 1-20 micrometers.
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