Recycled big size of graphite carbon refractory brick in low price 
Denfinition:
Carbon brick (Recycled big size of graphite carbon refractory brick in low price ) is a neutral refractory product made of carbonaceous as raw materials, adding appropriate amount of binder.
Raw Merterial:
Carbon brick raw materials include anthracite, coke and graphite, as well as asphalt, tar and anthracene oil and other bonding agent. AS anthracite volatile less, and has dense structure, carbon brick use it as aggregate, adding metallurgical coke (coal), and asphalt as a binder.
Production process:
the production process of carbon brick is similar with other refractory bricks, but carbon is easy to be oxidized at high temperatures, so the raw materials roasting and products firing must be carried out in a reducing atmosphere. Anthracite should be roasted before use to remove volatile, sulfur, moisture, and increase the volumetric stability, mechanical strength and oxidation resistance of anthracite. Coke should be dried first to avoid molding difficulties due to high moisture content and the product cracking during firing. Asphalt should first melt and dehydration, so that the water content is less than 0.2%, dehydration temperature should be 120 ~ 160 ℃.
Carbon brick ingredients are roasted granular anthracite as aggregate, and its particle size depends on the size of the product: anthracite in large brick is 8 to 12 mm, small brick is 4 to 6 mm. Anthracite is about 60%. Coke is added with fine powder state, whose particle size of less than 88 microns should be about 70%. Blast furnace used carbon brick binder is usually added from 15 to 20%. In order to prevent oxidation, the brick in the firing use coke powder or coal powder as protection filler. Carbon brick’s firing temperature is 1300 ~ 1450 ℃, holding time is about 20 hours, the total firing time is about 240 to 420 hours,and then cooled to 40 ~ 60 ℃, finally be taken out from the kiln. It is must be paid attention that carbon brick out of the kiln is in high temperature, easy to fired and burn.
Features of carbon brick:
1. good thermal stability,
2. Small thermal expansion coefficient,
3. high temperature resistant,
4. resistant to acid, alkali, salt and organic solvent erosion,
5. but easy to oxidation in the oxidation atmosphere.
Uses of carbon brick:
1. metallurgical industry, such as blast furnace
2. aluminum electrolytic cells
3. pickling tank, plating tank of electroplating industry
4. dissolving tank of paper making industry
5. reaction tank, storage tank of chemical industry
6. autoclave of petrochemical industry and so on.
