Preparation of Magnesia Insulation Materials by Calcination of Walnut Shell Powder by Silica Sol Impregnation

Table 2

Chemical compositions of the raw materials (ω/%).

Raw materials	Al2O3	SiO2	CaO	MgO	Fe2O3	K2O	Na2O	Il
High-purity magnesia powder	0.32	0.70	0.58	97.50	0.52			0.11
Porous magnesia aggregates	0.34	0.71	0.60	96.80	0.55			0.23
Midrange magnesia powder	0.15	1.51	2.20	94.22	0.92			0.2
Calcium aluminate cement	69.8	0.40	29.40
Walnut shell powder	0.18	0.84	0.28	0.07		0.24	0.04	98.28
Silica fume	0.14	94.87	1.13	0.72			0.43	2.66