Refractory Bricks for Carbon Baking Furnace

Clay bricks for carbon roasting furnaces are a kind of refractory materials specially designed for carbon roasting furnaces. They have specific physical and chemical properties, are resistant to high temperatures, have high strength, are resistant to erosion and peeling, and ensure the stable operation of carbon roasting furnaces under extreme conditions to meet the use requirements in high temperature environments. Clay bricks for carbon roasting furnaces are based on the production of general clay bricks, using specific homogenized materials as the main raw materials, hard clay, coke and binders, adding appropriate amounts of additives, through fine grinding, mixing, high pressure molding, and transforming into mullite crystal phase at appropriate firing temperatures. The used products have good mineral composition, so that the products have high refractoriness, dense bulk density, low porosity, excellent high temperature creep performance and good volume stability.
Its Al2O3content is generally 30%~40%, and its Fe2O3 content is less than 2.0~2.5%. Carbon roasting furnace clay bricks are weakly acidic refractory products that can resist the erosion of acidic slag and acidic gas.

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Description

Carbon roasting furnace is a kind of thermal equipment that heats various carbon products after high pressure forming indirectly at the prescribed roasting temperature under the condition of air isolation, so as to improve the electrical and thermal conductivity of the products and enhance the strength of the products. Carbon roasting furnace protection Low creep clay bricks used in roasting furnaces often affect the high temperature performance of products due to the large impurity content, especially the load softening temperature and creep resistance of products. At the same time, due to the shrinkage of products during the firing process, the fire channel wall or cross wall will sink during use, which seriously affects the service life of the roasting furnace. Thermal shock stability Traditional low creep clay bricks have poor thermal shock stability and high temperature creep rate, which causes the deformation and depression of the furnace wall to appear early and the wall deformation is large, which seriously affects the production efficiency and the quality of carbon anode products.

Because we adopt new production technology, the performance of products is improved, the thermal shock stability of products is greatly improved, and the overall stability of the furnace chamber is improved. Improvement of thermal conductivity Traditional low creep clay bricks have low thermal conductivity and slow heat transfer, which results in a large temperature difference between the fire channel and the material box (temperature difference is above 100°C), resulting in a huge waste of energy. As we have introduced new materials into the new bricks, the thermal conductivity is increased and the heat transfer performance is enhanced, which reduces the damage of high temperature to the furnace wall.

Products Description

If the carbon products are roasted once, the working temperature of the kiln is generally 800~1250℃; when the second roasting is carried out, the working temperature of the kiln is 600~800℃. In addition, the graphitization furnace is heated by electrodes, and the temperature around the electrodes can reach 2600~3000℃. However, the lining refractory bricks are far away from the electrodes, and the material itself is a conductor, which can protect the lining refractory bricks. Therefore, the lining of the carbon product roasting furnace is generally built with clay bricks with a refractoriness of 1671~1750℃. The price of the refractory bricks is not only cheap but also can meet the requirements of process production.

Carbon roasting furnaces include multi-layer furnaces, linear sintering machines, fluidized bed furnaces and rotary kilns. Roasting is a self-heating process. After ignition, the charge releases a large amount of heat, and sintering can be achieved without adding more fuel. The operating temperature of the furnace is generally lower than 1400°C, there is no chemical erosion and other effects, and the use conditions are good. Therefore, the lining of this type of furnace is generally built with clay bricks, and the lining of individual parts can be built with high-alumina bricks to meet production requirements, and the service life is longer.

Refractory materials for carbon roasting furnaces

Brands/Items	Special clay bricks		Special high alumina brick
Al₂O₃%	42-53		≥65
Fe₂O₃ %	1.5		1.2
CaO+MgO % ≤	0.7		0.7
Na₂O+K₂O % ≤	0.8		0.8
Refractoriness ℃ ≥	1750		1790
0.2MPa Load softening start temperature RUL ≥	1480		1600
Bulk density BD g/cm³≥	2.3		2.50
Apparent porosity AP % ≤	16		19
Normal temperature compressive strength CSS MPa ≥	45		50
High temperature flexural strength MOR Mpa ≥	1200℃	1350℃	1350℃
	10	4	6
Creep rate % 0.2MPa ≤ High temperature	1280℃×50h		1350℃×50h
	0.38		0.4
Re-firing line changes PLC %	1450℃×2h		1350℃×50h
	+0.1～-0.3		+0.1～-0.2
Thermal expansion rate % ≤	1000℃		1000℃
	0.65		0.7

Brand/Item	HX40-A	HX40-B	HX50-A	HX50-B	HX60-A	HX60-B
Al₂O₃ %	42-53	45-53	≥45	≥50	≥60	≥58
Fe₂O₃ %	≤1.6	≤1.6	≤1.0	≤1.2	≤1.1	≤1.4
TiO₂ %			≤1.5	≤2.0
CaO+MgO %	≤0.7	≤0.7				≤0.7
K₂O+Na₂O %	≤0.8	≤0.8	≤0.6			≤0.8
Refractoriness ℃	≥1750	≥1750			≥1770	≥1750
Apparent porosity %	11-19	11-19	≤16	≤14	≤18	11-19
Bulk density g/cm³ Bulk Density	≥2.20	≥2.20	≥2.35	≥2.40	≥2.45	≥2.35
Normal temperature compressive strength Mpa	≥40	≥50	≥40	≥60	≥70	≥60
Softening temperature under load ℃	T0.5≥1450	T0.5≥1490	T0.5≥1470 (Differential method)	T0.5≥1500	T0.5≥1600	T0.5≥1600
Reburning line change rate %	1450℃×2h +0.1～-0.1	1450℃×2h +0.1～-0.1			1600℃×2h ±0.2
Creep rate % 0.2Mpa,(0-25h)	1280℃ ≤0.4	1280℃ ≤0.25	1280℃× (14-24)h ≤0.007	1350℃×(20-50)h ≤0.2	1280℃ ≤0.1
High temperature flexural strength MPa 1350℃×0.5hr	≥4	≥4	≥6	1370℃×0.5hr ≥6		≥6
Linear expansion rate,1000℃ % Linear Expansion	≤0.7	≤0.7				≤0.65

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