High temperature tunnel kiln (firing temperature ¡Ý1800Celsius)
Process description: The following process is adopted for brickmaking. The high quality sintered magnesite produced by the kiln of the company, chrome concentrate and calcined bauxite are used as raw materials. The concentrate proportion, high temperature firing are adopted to produce various brands basic refractories.
Magnesia Brick
Item |
Spec | |||
MZ-91 |
MZ-89 |
MZ-87 |
MGZ-82 | |
MgO, % Min |
91 |
90 |
87 |
82 |
SiO2, % |
- |
- |
- |
5-10 |
CaO, % Max |
3 |
3 |
3 |
2.5 |
Refractoriness under load at 0.2 MPa Min |
1550 |
1550 |
1520 |
1550 |
Apparent Porosity, % Max |
18 |
20 |
20 |
20 |
Cold Crushing strength MPa Min |
58.5 |
49 |
39.2 |
39.2 |
Reheating Liner Charge Max |
0.5 |
0.6 |
- |
- |
High Grade Magnesia Brick
Item |
Spec | |||
MZ-95 |
MZ-96 |
MZ-97 |
MZ-98 | |
MgO, % Min |
94.5 |
95.5 |
96.5 |
97.5 |
Refractoriness under load at 0.2 MPa Min |
1620 |
1650 |
1680 |
1700 |
Apparent Porosity, % Max |
20 |
20 |
18 |
18 |
Cold Crushing strength MPa Min |
39.2 |
39.2 |
39.2 |
44.1 |
Magnesia-Chrome Brick
Item |
Spec | |||
MGr-20 |
MGr-16 |
MGr-12 |
MGr-8 | |
MgO,% Min |
40 |
45 |
55 |
60 |
Cr2O3,% Min |
20 |
16 |
12 |
8 |
Refractoriness under load at 0.2 MPa Min |
1550 |
1550 |
1550 |
1530 |
Apparent Porosity, % Max |
23 |
23 |
23 |
24 |
Cold Crushing strength MPa Min |
24.5 |
24.5 |
24.5 |
24.5 |
High Quality Magnesia-Chrome Brick
Item |
Spec | ||||
Rebonded |
Semi-rebonded |
Direct-bonded |
Fullsynthetic |
Prtomed reaction | |
MgO, % Min |
60 |
60 |
75 |
65 |
75 |
Cr2O3, % Min |
20 |
16 |
10 |
10 |
6 |
SiO2, % |
1.0 |
2.0 |
2.0 |
1.5 |
2.0 |
Refractoriness under load at 0.2 MPa Min |
1680 |
1650 |
1650 |
1670 |
1650 |
Apparent Porosity, % Max |
15 |
17 |
18 |
16 |
17 |
Cold Crushing strength MPa Min |
45 |
40 |
40 |
40 |
35 |
break down MPa Min |
8 |
8 |
8 |
10 |
12 |
Medium grade MgO-Al2O3-Cr2O3 bricks taking medium grade sintered magnesite, super grade calcined bauxite (or MgO-Al2O3 spinal) and chrome concentrate as raw material, meticulous proportion, high pressure moulding, high temperature firing etc. The bricks are widely used for the arch brick laying because of good thermal shock resistance, slag resistance and better high temperature performance.
Medium Grade Magnesia-Alumina-Chrome Brick
Item |
Spec |
MgO, % Min |
84 |
Al2O3+Cr2O3,
% Min |
6-8 |
Apparent Porosity, % Max |
17 |
Cold Crushing strength MPa Min |
45 |
Refractoriness under load at 0.2 MPa Min |
1630 |
Thermal-Shock resistance |
4 |