High Chrome Brick

High-chromium bricks are shaped refractory products made from industrial-grade chromium trioxide and aluminum oxide as main raw materials, or with the addition of a small amount of zirconium oxide.  They are produced by high-temperature firing, resulting in a chromium trioxide content of not less than 75%, and a combined content of chromium trioxide, aluminum oxide, and zirconium oxide of not less than 98%. They possess excellent corrosion resistance, high compressive strength at room temperature, high strength at high temperatures, excellent wear resistance, high refractoriness, excellent thermal shock resistance, and good high-temperature volume stability.

一.Physical And Chemical Indicators High Chrome Brick

二.Corrosion Resistance of High-Chromium Bricks to Coal Slag

1.Slag resistance of high-chromium bricks. Coal slag is an acidic slag with a low melting point, which is highly corrosive to refractory materials. Both theoretically and practically, high-chromium bricks are proven to be excellent refractory materials for resisting coal slag corrosion.

2.The viscosity of coal slag decreases significantly with increasing temperature.

3. Among various refractory oxides, chromium oxide has the lowest solubility in coal slag.

4.Furnace lining erosion rate. With the increase of chromium oxide content in high-chromium bricks, the erosion rate of the furnace lining decreases. The relationship between the furnace lining erosion rate and the chromium oxide content is shown.

5.Slag corrosion resistance rate of high-chromium bricks (Zirchrom) with chromium oxide content of 60% to 90%.

三.Performance characteristics

1. Excellent high-temperature stability: The core component Cr2O3 has a melting point of up to 2400℃, and combined with high-temperature components such as Al2O3(melting point 2050℃), high-chromium bricks can serve for a long time in ultra-high temperature environments such as steel blast furnaces and glass melting furnaces.

2. Superb resistance to molten slag corrosion and penetration: Cr₂O₃ has extremely low solubility in various coal slags, and most slags have poor wettability to it.

3. Excellent high-temperature mechanical strength: After high-temperature sintering at 1700℃, Cr2O3 and Al₂O₃ form a well-crystallized, continuous aluminum-chromium solid solution, further enhanced by the strengthening effect of components such as ZrO₂ (melting point 2700℃).

4. Outstanding erosion and wear resistance: The structural characteristics of low apparent porosity and high compressive strength, coupled with the enhanced sintering effect of ZrO₂, give high-chromium bricks excellent resistance to fluid erosion.

5. Good thermal shock stability: Domestic high-chromium bricks usually add about 2% monoclinic zirconia, utilizing the volume effect generated during the ZrO₂ phase transition to achieve "phase transformation toughening," significantly improving the thermal shock resistance of the material.

四.Application

I. Iron and Steel Metallurgy Industry (Core Application Fields)

1. Blast Furnace Systems

2. Ladles and Tundishes

3. Electric Arc Furnaces and Converters

II. Cement and Building Materials Industry

1. Cement Rotary Kilns

2. Cement Decomposition Furnaces and Preheaters

III. Glass Manufacturing Industry

1. Glass Melting Furnaces

2. Glass Fiber Tank Furnaces

IV. Non-ferrous Metal Smelting Industry

1. Copper, Nickel, Lead, and Zinc Smelting Furnaces

2. Aluminum Electrolytic Cells

V. Other High-Temperature Industrial Fields

1. Waste Incineration Power Generation

2. Chemical Kilns