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Direct bonded magnesia chrome bricks for cement kiln

MgO (% )≥55～70;　　Cr₂O₃ (%)≥9～20
Cold Crushing Strength(MPa)≥40
Refractoriness Under Load 0.2MPa℃:1650～1700

Application:

Direct bonded magnesia chrome bricks can be used for linings of cement rotary kiln such as transition zone, burning zone and calcining zone in the new dry cement production line.

　　Direct bonded magnesia chrome bricks use high purity sintered magnesia and chromium concentrate as main raw materials, manufactured by sintering at high temperature or ultra-high temperature.

　　In order to form direct bonded, the SiO₂ content in raw materials is best to low, and that the sintering temperature must be raised to about 1700℃.

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Index	DMC12A	DMC9A	DMC12B	DMC9B	DMC20C	DMC18C	DMC16C	DMC12C
MgO (%) ≥	65	70	65	75	55	60	65	70
Cr₂O₃ (%) ≥	12	9	12	9	20	18	16	12
SiO₂ (%) ≤	2.5	2.2	2.0	1.8	2.5	2.4	2.4	2.0
Apparent porosity (%) ≤	18	18	18	18	18	18	18	18
Bulk density (g/cm³) ≥	3.00	3.00	3.05	3.05	3.15	3.10	3.05	3.00
Cold Crushing Strength (MPa) ≥	40	40	40	40	40	40	40	40
Refractoriness Under Load 0.2MPa (℃)	1650	1650	1680	1680	1700	1700	1700	1680
Thermal Shock Resistance, 950℃ Air cooling/1100℃ Water cooling (Times) ≥	4	4	6	6	6	6	6	6

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