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Basic refractory products with periclase and magnesia-chrome spinel as the main crystal phases are called magnesia chrome bricks. International standard ISO1109 classifies magnesia-chrome products according to the limited content of the main chemical components. Rongsheng Refractory Brick Manufacturer can provide high-quality magnesia-chrome bricks (55%≤MgO < 80%), chrome-magnesia bricks (25%≤Mg0<55%), and chrome bricks (Cr2O3≥25%, MgO≤25%). Rongsheng Magnesia Chrome Bricks for Sale. Factory direct sales, low price, good quality, fast delivery. Contact Rongsheng for free quotes.

 

Types of Rongsheng Magnesia Chrome Bricks

 

Usually, the raw materials used to produce MgO-Cr2O3 products are mainly magnesia sand, chrome ore, and synthetic magnesia chrome sand. Sometimes a small amount of additives are added. Sintered magnesia sand and fused magnesia sand with different MgO contents (generally greater than 89%) are combined with refractory grade chromium ore, chrome concentrate, sintered or fused synthetic magnesia chrome sand with different Cr2O3 contents (sometimes a small amount of chrome green is added). Magnesia chrome brick products of various qualities can be produced.

Rongsheng refractory brick manufacturer can provide magnesia chrome bricks, directly bonded magnesia chrome bricks, rebonded (semi-rebonded) magnesia chrome bricks, unfired magnesia chrome bricks, etc.

Ordinary magnesia chrome bricks are generally produced from sintered magnesia sand (MgO content between 89% and 92%) and refractory grade chrome bricks. They are referred to as magnesia-chrome bricks.

 

Production Process of Magnesia-Chrome Bricks

 

A typical batch of magnesia chrome bricks is chromium ore 2.0~0 mm, 25%~35%; magnesia sand 3~0 mm, 40%~45%; magnesia sand less than 0.088 mm, 20%~30%.

The batch of a thermally stable magnesia-chrome brick is chromium ore 3~1 mm, 35%; magnesia sand 3~0mm, 30%; magnesia sand less than 0.088 mm, 35%.

The mixing, molding, and drying of magnesia-chrome brick are the same as those of magnesia brick.

Usually, because chromium ore contains low-valent iron, when sulfite pulp waste liquid is used as a binder for molding, the residual carbon is not easy to burn out in the preheating zone. Therefore, the stacking bricks of magnesia chrome bricks should leave a larger fire channel, appropriately reduce the density of the stacking bricks, and increase the heating speed of the bricks in the preheating zone.

Magnesia chrome bricks should be fired at the highest possible temperature. Because the microstructure and properties of magnesia-chrome bricks are greatly affected by the firing temperature. The highest firing temperature of ordinary magnesia-chrome bricks is generally between 1550 and 1600°C. Under the premise of ensuring the shape accuracy of the product, the firing temperature should be as high as possible.

 

Physical and Chemical Properties of Magnesia Chrome Bricks

 

The refractoriness of magnesia chrome bricks is greater than 2000℃. The load softening temperature is generally above 1550℃. The high-temperature volume stability is good, and the resistance to rapid cooling and heating is stronger than that of magnesia bricks. The physical and chemical performance indicators of magnesia-chrome bricks produced by Rongsheng refer to the provisions of YB/T5011-1997. At the same time, Rongsheng Manufacturer can also customize magnesia chrome bricks according to your actual working conditions.

 

Physical and Chemical Indicators of Magnesia Chrome Bricks in Rongsheng
Items	MGO %, ≥	Cr2O3 %, ≥	Apparent Porosity %, ≤	Compressive Strength at Normal Temperature MPa, ≥	0.2MPa Load Softening Start Temperature ℃, ≥
MGe-20A	50	20	18	35	1700
MGe-20B	45	20	19	30	1650
MGe-20C	40	20	22	25	1550
MGe-16A	55	16	18	35	1700
MGe-16B	50	16	19	30	1650
MGe-16C	45	16	22	25	1550
MGe-12A	65	12	18	40	1700
MGe-12B	60	12	19	35	1650
MGe-12C	55	12	21	30	1550
MGe-8A	70	8	18	40	1700
MGe-8B	65	8	19	35	1650
MGe-8C	60	8	21	30	1530

 

Application of Magnesia Chrome Bricks

 

Ordinary magnesia chrome bricks have a simple production process and low price. They are widely used in cement rotary kilns (Cr2O3 content rarely exceeds 14%). Glass kiln regenerators, steelmaking furnace linings, permanent layers of refined steel ladles, and non-ferrous metallurgical furnaces. Lime kilns, mixed iron furnaces refractory high-temperature kiln linings, etc.

 

Rongsheng Refractory Bricks Manufacturer

Rongsheng Manufacturer is a powerful manufacturer of refractory bricks. Rongsheng’s basic refractory bricks, such as magnesia bricks, magnesia chrome bricks, magnesia spinel bricks, magnesia bricks for glass kilns, etc., have guaranteed product quality and are well received by customers. Rongsheng refractory bricks, factory direct sales, preferential prices, and fast delivery! Rongsheng Magnesia Chrome Bricks for Sale. Whether you need refractory bricks for cement kilns, glass kilns, AOD furnaces, or non-ferrous smelting, Rongsheng can provide high-quality refractory bricks in standard and customized sizes according to the actual needs of your project. If you have high-quality requirements for magnesia chrome refractory bricks and need to save procurement costs, please contact Rongsheng. Rongsheng can provide free samples, solutions, and quotations.