How to Use G Size Refractory Bricks

2023-08-15 17:20:42

G-size refractory bricks belong to the size of blast furnace products. The general materials are high alumina and clay. Products of various materials can be customized, such as: clay, high alumina, silicon, corundum, mullite, etc., to meet the needs of blast furnaces. Requirements for the use of refractory bricks.

G1-G8 are blast furnace refractory bricks. Commonly used are high alumina bricks and clay bricks. The following is the standard introduction of G series bricks

G1: 230*15*75(mm)

G2: 345*150*75(mm)

G3: 230*150*135*75(mm)

G4: 345*150*130*75(mm)

G5: 230*150*120*75(mm)

G6: 345*150*110*75(mm)

G7: 230*150*90*75(mm)


There are many kinds of blast furnace refractories. Generally speaking, clay bricks or high alumina bricks with excellent functions are used in the middle and upper parts of the furnace body, while special refractory materials such as carbon products, silicon carbide bricks, mullite bricks, and corundum bricks are used in the lower part of the furnace body. The waist and belly of the furnace body, especially the recently produced silicon carbide bricks, have been successfully used in blast furnaces. At the same time, other unshaped refractory materials have also been widely used.

How to Use G Size Refractory Bricks

When building wall blast furnaces, hot blast furnaces, or lime kilns, the cooperation of the two brick types allows the construction of rings of different diameters to suit the size and diameter of the furnace as the blast furnace changes. Usually, G1 insulation bricks are used to cooperate with G3 or G5 wedge bricks, and G2 insulation bricks are used to cooperate with G4 or G6 wedge bricks. Since the ring diameter is different during the wall-laying process, the number of cooperation between straight bricks and wedge-shaped bricks is also different.

For the lining wall of the furnace, its circular joints require all staggered joints to build walls, and it is required not to cut bricks. If bricks must be cut, they need to be smoothed. The thickness of the masonry and the staggered joints are composed of brick lengths of 230mm and 345mm. The thickness of the cooperative masonry can be adjusted by 115mm, to reach the staggered joint, the thickness change is less than 115mm, which can be adjusted by the filler joint between the masonry and the furnace shell or between the masonry and the cold wall.

With the working conditions and damage mechanism of various parts in the furnace; the way of cooling equipment and its influence on the brick lining; it is necessary to guess whether the shape of the furnace after corrosion is reasonable.

A reasonable brick-type design can ensure the quality of masonry. The thickness of the insulation brick is generally 75mm, and a small level of seam can be obtained. There are two lengths of insulation bricks, 230mm and 345mm, which can be conveniently staggered. There are two types of bricks, straight insulation bricks, and wedge insulation bricks. Wedge-shaped insulation bricks or straight insulation bricks are used in combination with wedge-shaped insulation bricks alone to build walls and produce ring-shaped charges of any diameter to meet the needs of blast furnaces with different furnace capacities.

Calculation of the number of bricks: the bottom of the furnace can be calculated by dividing the total volume of bricks by the capacity of each brick. When calculating the number of bricks per layer, it can be calculated by dividing the horizontal cross-sectional area of the furnace bottom bricks by the corresponding surface area of each brick. Generally, a 2% to 5% loss is also considered.

If you need to calculate the weight of bricks, multiply the weight of each brick by the number of bricks. The rest of the blast furnace is a cylinder or cone. Whether it is the base layer or the inner surface layer, a circle should be built, and when building a circle, it is necessary to use wedge-shaped insulation bricks. If any straight body is built, whether it is the base or the inner surface, a ring must be built, and wedge-shaped insulation bricks must be used when building the ring.

If an arbitrary diameter ring is established, wedge-shaped insulation bricks are required to be used in conjunction with straight insulation bricks. Generally, G11 straight insulation bricks are used in conjunction with G13 or G15 wedge insulation bricks, and G2 straight insulation bricks are used in conjunction with G4 or G16 wedge insulation bricks. The number of cooperation between straight insulation bricks and wedge insulation bricks varies according to the ring diameter.

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