Calcium sulfate dihydrate (CaSO4.2H2O) was prepared from a chemical reaction between duck eggshell and sulfuric acid at room temperature (25ºC). When calcium sulfate dihydrate is dried in an oven at 110ºC, it can change to calcium sulfate hemihydrate or plaster of Paris (CaSO4.0.5H2O). After that, calcium sulfate hemihydrate (CaSO4.0.5H2O) was calcined at 700º, 800º, and 900ºC, it can transform to anhydrite or anhydrous calcium sulfate (CaSO4). Calcium sulfates (calcium sulfate dihydrate (CaSO4.2H2O), calcium sulfate hemihydrate (CaSO4.0.5H2O), and anhydrite (CaSO4)) can be applied for various applications i.e. construction, ceramic, petroleum and petrochemical, dental and medical industries functioning as a filler, binder, coagulant, adsorbent, catalyst, and starting material such as bone cement, mold making, cement, tissue engineering, etc. Furthermore, the raw material used in this research is raw duck eggshell which is the waste eggshell generated from food processing and egg powder industries from the transformation of liquid to solid powder. The obtained anhydrous calcium sulfate or anhydrite has true density, color, specific surface area, avg. pore diameter, and avg. particle size equal to 2.95 g/cm3, white powder, 3.57 m2/g, 96.98 Å, and 3.983 µm, respectively. In addition, characteristics, microstructures, phase transformation, and physical properties of raw materials and calcium sulfates are reported here by using XRF, SEM, XRD, pycnometer method, and BET.
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