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Carbon brick production process
Keywords: anti-corrosion carbon bricks
Release time:
2023-03-06 17:15
Source:
network
The production process of carbon bricks is roughly similar to other refractory bricks, but carbon oxidation must be prevented at high temperatures. Therefore, the roasting of raw materials and the firing of products must be carried out in a reducing atmosphere. Anthracite should be roasted well before use to eliminate volatile matter, sulfur and moisture, and improve the volume stability, mechanical strength and oxidation resistance of anthracite. Coke needs to be dried first to avoid difficulties in forming due to high moisture content and cracking of the product during the firing process. Asphalt should be melted and dehydrated first, so that its moisture content is less than 0.2%, and the dehydration temperature should be between 120~160 ℃.
The carbon brick ingredient is based on the baked granular anthracite as the aggregate. Its particle size depends on the size of the product: 8~12mm for large bricks and 4~6mm for small bricks. The addition amount of anthracite is about 60%. Coke is added as fine powder, with a content of about 70% for particles smaller than 88 microns. The amount of binder added to blast furnace carbon bricks is usually 15-20%. To prevent oxidation, brick billets are usually filled with coke powder or coal powder as protective fillers during firing. The firing temperature is 1300~1450 ℃, the insulation time is about 20 hours, and the total firing time is about 240~420 hours. When cooled to 40~60 ℃, the kiln is discharged. Carbon bricks are prone to ignition and combustion when discharged from the kiln at high temperatures.
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