The lining of the submerged arc furnace is composed of a thermal insulation layer, a thermal insulation layer, a thermal insulation layer and a working layer. The smelting process is in a complex environment of high temperature, corrosion and heat loss. Damage to the furnace lining increases energy consumption and production costs. Therefore, optimizing the furnace lining structure is the key to the mining industry. An important direction for energy saving in thermal furnaces.
1. To extend the service life of the cast iron electric furnace lining, forced water cooling slag-hanging lining technology can be used. This technology uses low thermal resistance refractory materials to build the furnace body and is equipped with corresponding cooling facilities. Through forced water cooling, the submerged arc furnace shell can be effectively cooled, so that the molten iron or slag on the inner surface of the furnace lining forms a stable solidification layer. This solidified layer plays a good thermal insulation and protective role between the furnace lining and slag iron, greatly reducing the risk of thermal erosion of the furnace lining, thereby significantly extending the service life of the furnace lining. This technology not only improves the operating efficiency of equipment, but also reduces maintenance costs for enterprises.
2. In the process of smelting ferrosilicon and silicomanganese in submerged arc furnaces, carbon bricks are the key building materials. Carbon bricks are selected mainly based on their excellent physical and chemical properties. Carbon bricks have a high melting point, which allows them to remain stable in the high-temperature environment of submerged arc furnaces and are not easily melted or deformed. At the same time, its excellent thermal shock resistance ensures that the furnace body can still maintain good structural integrity when encountering drastic changes in temperature, preventing damage caused by thermal shock. In addition, carbon bricks can maintain high strength at high temperatures, effectively supporting the furnace structure and preventing furnace collapse due to material softening. More importantly, the carbon bricks are not easily infiltrated by alloys and slag, which greatly reduces the corrosion rate of the furnace lining and extends the service life of the furnace body. These advantages make carbon bricks an ideal choice for smelting ferrosilicon and silicomanganese in submerged arc furnaces.
3. High-carbon chromite furnaces are mainly built with magnesia bricks because magnesia bricks have excellent physical properties. Its high strength can effectively support the furnace body and ensure the stability of the structure; at the same time, the excellent high temperature resistance of magnesia bricks enables it to maintain stability in high temperature environments for a long time and is not prone to deformation or performance degradation. It is particularly worth mentioning that magnesia bricks are particularly suitable for alkaline slag smelting environments. In addition, the load softening temperature of magnesia bricks is as high as 1550°C, which means that under extreme high temperature conditions, magnesia bricks can still maintain their structural strength and stability, thereby ensuring the safe operation of the furnace body. These properties make magnesia bricks an ideal choice for high carbon chromite furnace masonry.
4. During the construction process of the nickel-iron ore furnace, refractory materials need to be carefully selected to ensure the stability and durability of the furnace body. Among them, commonly used refractory materials include carbon bricks, chrome magnesia bricks and magnesia ramming materials.
When building furnace walls and furnace bottoms, we often use carbon bricks and use electrode paste for bonding. However, under high temperature, the electrode paste will produce volatiles, which may cause tiny gaps between the carbon bricks. These gaps become channels for liquid nickel iron to penetrate, allowing it to penetrate into the bottom of the carbon bricks, causing the carbon bricks to float.
In addition to carbon bricks, we also use magnesia carbon bricks for furnace bottom masonry. However, magnesia carbon bricks also have the problem of floating. In order to solve this problem, we introduced magnesia ramming materials for furnace bottom masonry. Magnesia ramming material has strong anti-penetration properties, which significantly extends the service life of the furnace bottom.
In addition, magnesia chrome bricks perform well in solving the problem of magnesia brick penetration. Its slag resistance has been significantly improved, while its volume remains stable at high temperatures up to 1800°C, demonstrating excellent high-temperature strength. This makes magnesia-chromium bricks an indispensable and important material in the construction of nickel-iron ore furnaces.
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