Blast furnace is the key equipment for ironmaking, and now blast furnace ironmaking is the common techinical process used worldwide. The blast furnace body is divided into 5 parts from top to bottom: furnace throat, furnace body, furnace waist, furnace belly and furnace cylinder. The temperature of each part of the furnace is: the bottom of the furnace is generally 1,450 ~ 1,500 ℃, the furnace cylinder parts, especially the wind mouth area of 1,700 ~ 2,000 ℃, the furnace belly, the furnace waist area of 1,400 ~ 1,600 ℃, the furnace on the upper part of the body for 600 ~ 800 ℃.
1、Furnace throat: blast furnace clay bricks, blast furnace high alumina bricks
2、Furnace body: blast furnace clay bricks, blast furnace high alumina bricks
3、Furnace waist: silicon nitride combined with silicon carbide bricks
4、Furnace belly: silicon nitride combined with silicon carbide bricks
5、Furnace cylinder: carbon bricks, corundum-mullite bricks, plastic phase composite corundum bricks
| Item | blast furnace clay brick | blast furnace high alumina brick | corundum-mullite brick | plastic phase composite corundum brick | silicon nitride combined with silicon carbide brick |
| GN-42 | GL-65 | GMZ-80 | ZSG | ||
| SiC；% | / | / | / | 6～10 | ≥70 |
| Fe2O3；% | ≤2.0 | ≤2.0 | ≤1.0 | ≤1.0 | ≤0.7 |
| Al2O3；% | ≥42 | ≥65 | ≥80 | ≥75 | / |
| refractoriness；℃ | ≥1700 | ≥1750 | ≥1790 | ≥1790 | ≥1790 |
| Apparent porosity；% | ≤22 | ≤20 | ≤18 | ≤16 | ≤18 |
| bulk density；g/cm3 | ≥2.15 | ≥2.35 | ≥2.80 | ≥2.90 | ≥2.65 |
| Cold crushing strength；Mpa | ≥35 | ≥55 | ≥100 | ≥100 | ≥120 |
| 0.2MPa refractoriness-under-load；℃ | ≥1400 | ≥1500 | ≥1680 | ≥1650 | / |
| Permanent linar change on heating；% | 1300℃×2h 0～-0.4 |
1400℃×2h 0～-0.4 |
1500℃×2h +1～-0.2 |
1500℃×2h +1～-0.2 |
/ |
| alkaline resistance；% | / | / | / | ≤10 | / |
| Iron dissolution index；% | / | / | ≤2 | ≤2 | / |
| Application | Upper part of the furnace | Upper part of the furnace | Furnace Base, Furnace Cylinder Ceramic cups, ceramic mats |
Furnace Base, Furnace Cylinder Ceramic cups, ceramic mats |
The lower part of the furnace body, Waist, belly |
| Item | Carbon ramming material | silicon carbide filler | Feeding without water pressure | buffer mud | Self-flowing castable |
| SiC；% | / | ≥70 | / | / | / |
| C；% | ≥80 | / | / | / | / |
| Al2O3；% | / | / | ≥55 | ≥70 | ≥60 |
| bulk density；g/cm3 | ≥1.5 | ≥2.0 | ≥2.0 | 1.7～1.8 | ≥2.30 |
| Cold crushing strength；Mpa | ≥12 | ≥10 | ≥10 | ≥0.5 | ≥35 |
| Modulus of rupture；Mpa | / | ≥5 | ≥4 | ≥0.2 | ≥10 |
| Thermal conductivity；W（m·k） | ≥10 | ≥5 | |||
| Application | Between the water-cooling plate and carbon bricks at the bottom of the furnace | Gap between blast furnace cooling staves | Between blast furnace cooling stave and furnace shell | High temperature kiln lining thermal stress buffer | Between the cooling stave on the upper part of the furnace body and the furnace shell |
Coking
Refractory materials for Blast furnace
Refractory materials for casting
Hot blast stove
Pretreatment of Liquid Iron
