　　Direct-bonded magnesite chrome brick uses high-purity magnesite and chrome concentrate as the main raw materials. It is fired at a temperature above 1700 ℃, and most of its refractory grains are in direct contact. Divided into Direct-bonded magnesite chrome brick for cement kiln and Direct-bonded magnesite chrome brick for glass kiln according to application. Direct-bonded magnesite chrome brick for cement kiln is divided into two grades of low chromium type and medium chromium type according to Cr2O3 content. Glass Direct-bonded magnesite chrome brick for kiln is high-chromium type DMC-12.

Physical and chemical indicators:

ItemFor cement kilns		Direct-bonded magnesite chrome brick		For glass kilnDirect-bonded magnesite chrome brick
		Medium chromium type	Low chromium type	DMC-12
MgO % ≥		73	80	70
Cr2O3 %		7～10	2～5	≥12
SiO2 % ≤		1.8		2.0
Bulk Density g/cm³ ≥				3.0
Apparent porosity % ≤		18		18
Compressive strength at room temperature Mpa ≥		50	55	45
Load softening start temperature T0.6 ℃ ≥		1650	1600	1650
Thermal shock stability Times ≥	1100℃,Water cooling	5		5
	950℃,Air chill	30

Magnesia chrome brick

Direct-bonded magnesite chrome brick

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