Thermal Analysis of Calcium Oxalate Using TGA
Calcium oxalate is an important functional material with diverse applications:
- Ceramics & Glass: As a fluxing agent, it lowers glaze melting points and enhances adhesion and gloss. It can also serve as a fine polishing abrasive.
- Chemicals & Reagents: Key intermediate for oxalic acid production, metal separation, and synthesis of compounds like ferrous oxalate or ammonium oxalate, widely used in pharmaceuticals, agrochemicals, and dyes.
- Materials & Environmental Applications: Flame retardant for paper/textiles, heavy metal removal in wastewater, and stone protection in restoration.
- Industrial Additives: Specialty lubricants and chemical waterproofing components.
In our study, we used Thermogravimetric Analysis (TGA) to investigate the thermal decomposition of calcium oxalate. Analytical-grade calcium oxalate monohydrate (5 mg) was placed in an alumina crucible and heated from room temperature to 900°C at 10°C/min under nitrogen. The TGA curve revealed three main weight-loss stages:
1️⃣ 159–272°C (12.1% loss): Loss of crystallization water → anhydrous calcium oxalate
2️⃣ 385–546°C (19.5% loss): Decomposition of anhydrous calcium oxalate → calcium carbonate + CO
3️⃣ 610–819°C (31.6% loss): Calcium carbonate → calcium oxide + CO₂
✅ Final residue: Calcium oxide (CaO), consistent with theoretical predictions.
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