high energy milling pw 700i mixer mill. Then calcium oxide (CaO) synthesized by limestone powder calcination at 9000C for 4 hours, after it was destroyed by the motor grinder called samples C0, on the other hand the other samples were destroyed by HEM (high-energy milling PW 700i mixer / Mill) at speed 1000 rpm varies with the duration of milling, whereas C1, C2, C3 samples at 90, 180, 270 ...