| 摘要 |
PROBLEM TO BE SOLVED: To provide MgO for annealing separating agents which enables stable production of grain oriented silicon steel having a uniform and high-quality forsterite coat even when used as an annealing separating agent after baking in a rotary kiln.SOLUTION: MgO for annealing separating agents has a CAA40% of 60-100 s, CAA80% of 150-300 s and a BET specific surface area of 12-35 m/g and contains 0.2-1.0 mass% of CaO, 0.01-0.04 mass% of Cl and 0.15-0.50 mass% of P in terms of PO. Preferably, the MgO is formed by baking Mg(OH)of a BET specific surface area of 10-25 m/g, and the P content in terms of PO[PO](mass%) and the Cl content(mass%) meet equation (1): [PO]≥125[Cl]-9.95[Cl]+0.348. |
