Wall of electric stove furnace is optimized with firebrick

Lining of electric arc furnace basically includes furnace lid, furnace wall and hearth, the most commonly used lining is alkaline furnace lining. Fireproof material should have the following character in lining of alkalescent electric arc:

　　
1. has enough fireproof sex and fireproof sex below load, because be in electric arc action? ? Below, temperature of lining of electric arc furnace can amount to 1500~1800 ℃ .

　　
2. should have the stronger sex that fight broken bits, because of slag, the gap that soot and dust can leave through high temperature is amiable aperture infiltration liner, the melt that this meeting brings about fireproof material damages and bring about flake.

　　
3. fights thermal shock sex goodly. In steely smelt process, furnace door opening furnace and litre fall furnace lid can bring about temperature to change quickly, furnace may flake or craze.

　　
4. should have enough strength, because lining is charging,be pounded in the process, the meeting when tilting produces vibration, metal, slaggy the air when boiling with iron fluid is rinsed.

　　
5. coefficient of thermal conductivity is low, conductivity is low.

Fireproof material has the electric arc heat that uses normally water chestnut magnesia brick, dolomite brick, tall aluminous brick, silica brick, compound of punch of to calcine magnesite. Because the working requirement difference of different position is very big, should choose relevant fireproof data.

Fireproof material often is in lining of electric arc furnace high temperature, slaggy erode the condition with urgent cold urgent heat to fall, working requirement is extremely abominable. In steel-making fused period with oxidation period, lining is not sent damage for high temperature place, but in deoxidizing stage blocking stage, steel fluid temperature is quite high, suffer electric arc again direct radiate, lining damages very easily. Additional, when giving steel feed a machine, lining temperature drops suddenly, install makings begin power transmission, temperature lifts gradually again, the temperature change of this kind of urgent cold urgent heat often is the immediate cause that lining flakes.

Slag is right of lining erode action, the decision grants its composition and fluidity. Content of the SiO2 in broken bits heals tall, alkalescent lining corrodes more serious. Outside dividing SiO2, the Al2O3 in broken bits, Fe2O3, CaF2 erode lining likewise. The fluidity of slag is influential also to lining, broken bits is rare erode to lining effect is serious, the capability that and turn over shoots electric arc is strong, can increase lining the thermic load of fireproof material; Broken bits is stiff it is difficult to make bath heats, content changes reaction condition to become poor, extend time of effect of lining high temperature (namely smelt time) . These metropolises quicken the attaint of lining.

 Raise furnace wall the technical measure of fireproof material life:

 
1, big crystallization magnesia: Tall purity, low SiO2, B2O3, tall CaO/SiO2, grain is more than 150μm

 
2, high pure black lead: Phyletic, particle size distribution, purity

3, additive: Al, Si, Mg, alloy, boride (ZrB2, CaB2, Mg2B3) , B4C

4, vacuum oily dip: Can close stomatic, rise fight aggressivity

 
5, bond: Phenolic aldehyde colophony (taller incomplete carbon measures 50 ～ 60 ％ ) , bitumen, bitumen - colophony is compound

Commonly used and fireproof material has electric stove: Combine magnesian chromic brick directly, magnesia brick, magnesian chromic brick, chromic brick of magnesium of chromic brick of magnesium of oily dip magnesia brick, direct union, founding.