Magnesia calcium brick refractory brick

Magnesia calcium brick is also called high calcium magnesium brick. It is a magnesia refractory with periclase as the main crystal phase and tricalcium silicate as the secondary crystal phase. Contains MgO80%～87%, CaO6%～9%, CaO/SiO2 ratio is between 2.2～3.0. Its obvious structural characteristics are that periclase is in direct contact with dicalcium silicate and tricalcium silicate, and the eutectic (4CaO•Al2O3•Fe2O3 is filled in the crystal gaps of dicalcium silicate and tricalcium silicate in thin veins). The porosity is low. The starting temperature of softening under load is generally higher than 1700 ° C, and the resistance to alkali slag is good. However, the thermal shock resistance is poor. It is fired at high temperature of 1550～1600℃.It is used in the wind eye of steelmaking side blowing converter, the top of open hearth furnace and the upper part of oxygen blowing converter. refractory brick
Refractory refractory brick refractory brick refractory brick
Refractory refractory brick refractory brick
Usage

Magnesia calcium bricks are widely used in AOD furnaces, VOD furnaces and LF furnaces and other concentrate equipment. refractory brick

Main Specifications
 

Item	Magnesia calcium brick grades and physical and chemical indicators
	MG-20A	MG-20B	MG-20C	MG-30A	MG-30B	GMG-1	GMG-2	GMG-3
W(MgO)%	≥70	≥70	≥70	≥62	≥62	≥70	≥62	≥70
W(CaO)%	20~22	18~22	20~22	28~32	28~32	22~25	32~36	22~25
W(SiO2)%	≤0.7	≤1.0	≤1.1	≤0.8	≤0.1	≤0.6	≤0.7	≤0.6
W(Al2O3)%	≤1.0	≤0.8	≤1.2	≤1.2	≤0.8	≤1.0	≤0.8	≤1.0
W(Fe2O3)%	≤1.0	≤1.3	≤1.4	≤0.8	≤1.3	≤0.7	≤0.6	≤0.7
ZrO2%								0.8~1.5
Porosity%	≤13	≤14	≤15	≤13	≤14	≤12	≤12	≤12
Density g/cm3	≥2.98	≥2.96	≥2.94	≥2.98	≥2.96	≥3.0	≥3.0	≥3.0
Strength Mpa	≥20	≥15	≥15	≥20	≥15	≥15	≥15	≥15
Softening℃	≥1700	≥1700	≥1700	≥1700	≥1700	≥1700	≥1700	≥1700

refractory brick
Refractory 
Refractory
Refractory