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Article Abstract
Objective: To control the quality of Limonitum by investigating the thermoanalysis curves.
Methods: Analysis Limonitum samples from different origins by Thermogravimetric-Differential Scanning Calorimetry( TG-DSC),and the processed samples and fake samples were analyzed to compare the difference of them at the same time.
Results: Thermal analysis curves showed that most of Limonitum samples had three weight loss steps in 30 ~ 1 000 ℃,and the process of dehydration weight loss of goethite was obviously in about309 ℃. There was a positive correlation between the weight loss rate of the second step and the content of iron.
Conclusion: The Thermal analysis method can provide reference to the identification and quality control of Limonitum.
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