International Standard Carbon Brick for Ferroalloy Furnaces and Blast Furnace Bottoms

China refractory manufacturer factory supply carbon brick for ferroalloy furnaces and blast furnace bottoms and hearth

Carbon bricks are made of coke, anthracite or graphite and tar as raw materials, mixed, shaped, and burned to 1450°C in a reducing flame. It can withstand the erosion of molten metal and various slags, but it is easy to oxidize. Anthracite has less volatile matter and compact structure. It is often used as aggregate in the production of carbon bricks, metallurgical coke is added, and pitch is used as a binder.
The technical requirements of carbon bricks are generally carbon content ≥92%; mechanical strength ≥25MPa; ash content ≤8%. The external dimensions are strictly required, and general products must undergo certain mechanical processing.

The manufacture of carbon bricks generally uses coke (<10 mm) with a small particle size and less ash content, and 16-18% coal tar is added and mixed uniformly. At the same time, it is crushed to 6 mm, and then pressed into shape. It also reduces the porosity. Finally, it is fired in a sealed furnace for several days and nights at a firing temperature of 1000°C. There should be no air gaps in this furnace; sand is used to cover the bricks during firing to completely isolate the bricks from air and heat the bricks by conduction. High fuel consumption and low output are the reasons for the high price of carbon bricks.

China refractory manufacturer factory supply carbon brick for ferroalloy furnaces and blast furnace bottoms and hearth

Carbon bricks have good thermal stability, small coefficient of thermal expansion, high temperature resistance, corrosion resistance of various acids, alkalis, salts and organic solvents, but they are easily oxidized in an oxidizing atmosphere.

The carbon brick is dark gray and shiny. A well-fired carbon brick will not stain your hands, and it will have a crisp sound when hit with a small hammer. High refractoriness and load softening temperature, good thermal shock resistance; not wetted by molten slag, molten iron, etc., almost not corroded by all acid-base salts and organic chemicals, good slag resistance, high temperature stability, high mechanical strength, Good wear resistance, good electrical and thermal conductivity.

Carbon brick data sheet

In addition, carbon is easy to oxidize. Whether it is the calcination of raw materials, the calcination of products and the use of products, all must be carried out in a reducing atmosphere.

1. Has extremely high refractoriness
Does not melt or soften. Only when the temperature is very high, there will be volatilization (>3000℃). But this temperature is not reachable in a blast furnace.
2. High compressive strength.
Its compressive strength can reach 250~500kg/cm2, which is similar to sticky brick. But the compressive strength of clay bricks can reach up to 1000kg/cm2.
3. The load softening point is much higher than that of clay bricks. Generally, the load softening temperature of clay bricks is 1400°C, while the load softening temperature of carbon bricks does not exist (that is, the softening point is extremely high), but it must be pointed out that this is only for high-quality carbon bricks with low ash content.
4. The slag resistance is very good, except for the slag containing high FeO, any slag can not play a corrosive effect.
5. It has high wear resistance, and its wear resistance is not inferior to clay bricks.
6. It is not infiltrated by iron and slag (iron slag cannot stick to carbon bricks), so there is less chance of nodulation and damage due to iron and slag. Therefore, in the past, carbon bricks were laid on the furnace body, thinking that this may reduce the chance of nodules (because the furnace nodules are usually generated at the furnace body), but the results prove that if the operation is abnormal, there will still be nodules.
7. The expansion coefficient is small. This is one of the characteristics of carbon bricks, and other refractory materials are far inferior to it. Rapid cooling at high temperatures will not produce cracks, which are extremely desirable properties for certain parts that are prone to cracks (such as the furnace bottom), so the furnace bottom bricks are mostly made of carbon bricks.
8. The thermal conductivity is much higher than that of clay bricks, especially graphite bricks. But its effects can be beneficial or harmful. A large heat loss is a negative effect, but it is advantageous to easily generate slag in the lower part. When the lower part of the blast furnace is built with carbon bricks, the cooling water can be used instead of cooling water, and only air is used for natural cooling. 

Carbon brick size:

China refractory manufacturer factory supply carbon brick for ferroalloy furnaces and blast furnace bottoms and hearth

Carbon bricks are not only widely used in the metallurgical industry, but also in aluminum electrolytic cells.

In addition, it is widely used in pickling tanks and electroplating tanks in the electroplating industry, dissolution tanks in the paper industry, reaction tanks and storage tanks in the chemical industry, autoclaves in the petrochemical industry, ferroalloy industrial furnaces (or equipment linings), acid solutions , Lye tank lining and pipeline, and smelting non-ferrous metals (such as aluminum, lead, tin, etc.) furnace lining.
Because of the above-mentioned properties of carbon bricks, they are widely used in masonry blast furnace bottoms and hearths. In recent years, the scope of use has been continuously expanded, and carbon bricks have also begun to be used in the hearth and lower part of the furnace body. It can increase the continuous operation time of the blast furnace and extend the service life.

The performance of refractory materials for blast furnace hearth is one of the key factors affecting the life of blast furnace. In the development of refractory materials for blast furnace hearths, one is to improve the performance and structure of carbon bricks, and use hot-pressed carbon bricks with high thermal conductivity, high purity, and micro-pores to overcome alkali corrosion, carbon deposition, molten iron penetration and other factors. Damage to the hearth; the second is to use new hearth materials.

China refractory manufacturer factory supply carbon brick for ferroalloy furnaces and blast furnace bottoms and hearth

Packaging for carbon brick
1.Pallet+Paper or Steel angle bead+Paper board +Plastic or Steel belt +Plastic film
(1)Wooden pallet size:Usually0.92*0.92m(standard brick),but 1*1m (special shape brick) at most,
(2)Load weight of each pallet:Usually 1.5-1.7Tons, max 2.0 Tons.
(3)20 Foot Container can be loaded max 25-26Tons, about 13-16Pallets.
2.Can make the package according to customer's requirements.

Shipping for carbon brick
1.FEDEX/DHL/UPS/TNT for samples.
2.By Sea for batch goods.
3.Customers specifying freight forwarders or negotiable shipping methods!
4.Delivery Time for carbon brick:
(1)Samples:3 days for common shape samples;45 days for special shape samples.
(2)Batch goods:Within 7-10days for in stock bricks from ordering shipping space to deliver goods and within 45-60 days for NO in stock bricks.
Payment Terms
(1)T/T, Western Union,LC;
(2)Usually 30% deposits,70% balance to be paid before delivery or against copy of BL or negotiations
Others
MOQ: Usually 1 container, MOQ 1Tons, Customers can order certain PCS for special carbon brick.

Henan hongtai kiln refractory co., LTD. Is well aware that there are thousands of demands from customers, which can be summarized in four aspects: reliable quality, timely delivery, reasonable price and considerate service.The company will continue to adhere to the corporate spirit of "contributing to society and serving customers" and the business philosophy of "mutual benefit, win-win, integrity, efficiency, preciseness and responsibility".Our company is willing to develop a wide range of technical exchanges with colleges and universities and colleagues from all walks of life at home and abroad in a flexible and diversified way.

Henan hongtai kiln refractory co., LTD. Main products are high alumina brick, clay brick, silica brick, fused zirconium corundum brick, carbon brick, magnesia brick, fireproof ball lightweight insulation brick, magnesia brick, carbon brick, wear-resistant pouring material, corundum pouring material, low cement high strength pouring material, impermeable material, self-flowing material, plastic material, and various types of refractory materials.

Henan hongtai kiln refractory co., LTD. : "quality first, reputation first, customer first: it is our aim."Scientific management, strong technical force, perfect testing means, advanced technological equipment and stable product quality are the guarantee of quality service.Henan hongtai kiln refractories co., LTD sincerely hopes to cooperate with you hand in hand and in good faith.

China refractory manufacturer factory supply carbon brick for ferroalloy furnaces and blast furnace bottoms and hearth
1. Strong professional:
Our company has thirty years producing experience in refractory products. Our manager will supervise on a various refractorys production materials, process control, quality supervision and package delivery, and ensure the products are 100% qualified.
2.Annual supply:
Our company has passed ISO9001 quality management system certification and SGS certification. And the annual supply of shaped and unshaped refractory product is 28, 800-35, 000 tons.
3. Export experiences:
Now we have gained a global sales network reaching Taiwan, Russia, South Korea, Vietnam, Pakistan, Bulgaria, French, India, Congo, Angola, South Africa, and so on.
4. Production equipment:
Production and testing equipments for carbon bricks are new, complete and automated or semi- automated. Such modern facilities and equipments have provided the fine technical guarantee for the production and testing.
5. Testing equipment:
Our company's testing equipments for carbon brick as follows:
High Temperature RUL Tester Bulk Density Tester The Pressure Tester Refractoriness Tester

Hongtai Kiln Refractory has professional sales and after-sale service team who provide customers all-around service about product selection, transportation, installation and operation technology training etc. Now we have established cooperation relationship with many science and research units and our products have been sold to Vietnam, Thailand, Malaysia, South Korea, Pakistan, Kazakhstan, India, Japan, Indonesia, Germany, Italy, Mongolia, Russia, Argentina, colombia, Eygpt, South Africa and etc.

We has over 20 years experience on producing carbon brick for blast furnace bottoms and hearths.

Payment Guarantee: If couldn't trust us at first order, could use trade Assurance.

Jerry Li         

Cell&WhatsApp: 0086-13373957739 

Email: jerry(at)ht-refractory.com