Aluminum silicon carbide castables are resistant to erosion and corrosion, high temperature, and not easy to stick to iron slag. Our factory has mature experience in the production and use of aluminum silicon carbide castables. Our products are used in large steel smelting companies, with a package of up to 700~800 times, durable and reducing corporate costs.
The working temperature is 1300-1450 ℃. The reason why the lining material needs to be frequently inspected or repaired is determined by the working environment that is superior to high temperature resistant materials:
(1) When the refractory lining of the working layer is impacted by high temperature, it will produce erosion and strong thermal shock stress;
(2) During the period of molten iron, it will be chemically eroded by molten iron and slag and oxidized by air;
(3) When pouring copper, nickel, lead, zinc and molten iron, it will be eroded and oxidized by high temperature;
(4) After the molten iron in the copper, nickel, lead, zinc and molten iron ladle is emptied, the temperature drops sharply, causing the ladle lining to cool rapidly and oxidize when exposed to air;
In this process, the lining is repeatedly subjected to rapid cooling and heating, erosion by slag iron, oxidation by air and scouring by molten iron, so it is very important to select materials that are resistant to thermal shock, scouring and oxidation.
Characteristics of aluminum-silicon carbide castables:
(1) Strong resistance to corrosion by copper, nickel, lead-zinc molten iron and slag;
(2) Good thermal shock resistance, small volume change after reburning;
(3) Strong antioxidant ability;
(4) Easy to construct, can be quickly baked without bursting, easy to repair and dismantle;
(5) When in use, no harmful gas is generated, no slag is sticky, and the service life is long.
The non-ferrous metals copper, lead and zinc usually have a short service life of the chute due to their low viscosity and strong metal permeability at high temperatures.
Aluminum silicon carbide castables are made of silicon carbide particles, silicon carbide fine powder, silicon nitride fine powder, modified carbon fine powder, sintered mullite fine powder, aluminate cement, silica fume and α-alumina micropowder, and composite admixtures are added and mixed to obtain castables for copper smelting chutes. Although this patented technology has the advantages of good resistance to copper corrosion and penetration, strong integrity and high strength of the copper smelting chute and long service life of the copper smelting chute, the modified carbon material and composite additives need to be prepared in advance, and the construction operation is relatively inconvenient; due to the high thermal conductivity of silicon carbide, the heat loss of the copper chute is large, resulting in energy waste.
Product Features
The aluminum silicon carbide castable developed by our company has the characteristics of erosion resistance, corrosion resistance and long life, and is widely used in copper, nickel iron, lead zinc and high nickel matte chutes.
Performance Table
Physicochemical indicators of aluminum silicon carbide castables for copper, nickel and lead zinc
|
project |
HX-AT |
HX-AT-X Steel Fiber |
|
|
chemical composition (%) ≥ |
Al2O3 |
55 |
55 |
|
SiC |
5 |
5 |
|
|
Bulk density (g/cm3) ≥ |
110℃×16h |
2.4 |
2.4 |
|
Compressive strength (MPa) ≥ |
110℃×16h |
45 |
45 |
|
1350℃×3h |
60 |
60 |
|
|
Flexural strength (MPa) ≥ |
110℃×16h |
6 |
6 |
|
1350℃×3h |
8 |
8 |
|
|
Line change rate (%) |
1350℃×3h |
-0.5～+0.5 |
-0.5～+0.5 |
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