Molten iron ladle is an important equipment in the steel smelting process, mainly used to transport molten iron from the blast furnace to the steelmaking furnace. In the process of using the ladle, due to the erosion and erosion of the high-temperature molten iron, the requirements for the lining material of the ladle are very high. As a commonly used refractory material, clay refractory bricks have good high temperature resistance, thermal shock resistance and slag erosion resistance, so they have been widely used in molten iron ladle lining. This article will introduce the clay refractory bricks for 1300 degree molten iron ladle in detail.
First of all, let's understand the basic concept of clay refractory bricks. Clay refractory brick is a kind of refractory material made of clay as the main raw material, through molding, drying, firing and other processes. The main components of clay refractory bricks are natural minerals such as kaolin, bentonite, and diatomaceous earth, which undergo sintering reactions at high temperatures to form a hard ceramic body. Clay refractory bricks have good high temperature resistance, thermal shock resistance and slag erosion resistance, so they are widely used in steel, metallurgy, building materials and other industries.
Next, let's take a look at the performance characteristics of clay refractory bricks for 1300 degree molten iron ladle. Clay refractory bricks for 1300 degree ladle mainly have the following performance characteristics:
Good high temperature resistance: the refractory degree of clay refractory bricks for 1300 degree ladle is generally between 1400-1500, which can meet the requirements of the ladle lining.
Good thermal shock resistance: clay refractory bricks have good thermal shock resistance at high temperatures, and can resist the risk of cracking caused by rapid temperature changes.
Strong resistance to slag erosion: Clay refractory bricks have good resistance to slag erosion, can resist molten iron erosion and slag erosion, and prolong the service life of molten iron ladle.
Good wear resistance: clay refractory bricks have good wear resistance at high temperatures, which can resist the friction and wear of molten iron and reduce the loss of lining materials.
Convenient construction: The forming process of clay refractory bricks is simple and easy to construct, which can meet the different shape and size requirements of the ladle lining.
*Moderate: Compared with other high-performance refractories, clay refractory bricks are more moderate and have a higher cost performance.
Finally, let's take a look at the construction method of clay refractory bricks for 1300 degree molten iron ladle. The construction of clay refractory bricks for 1300 degree molten iron ladle mainly includes the following steps:
Clean the base surface: Before construction, it is necessary to clean the base surface of the ladle lining to remove oil, rust and other debris to ensure the adhesion between the clay refractory bricks and the base surface.
Cutting clay refractory bricks: According to the shape and size requirements of the ladle lining, the clay refractory bricks are cut to meet the construction needs.
Masonry clay refractory bricks: The cut clay refractory bricks are masonry according to the design requirements, and attention is paid to the filling and compaction of the brick joints to ensure the overall stability of the lining.
Baking clay refractory bricks: After the masonry is completed, the clay refractory bricks need to be baked to make them reach the service temperature and improve their use performance.
In short, the clay refractory bricks for 1300 degree ladle have good high temperature resistance, thermal shock resistance and slag erosion resistance, which can meet the requirements of the ladle lining. At the same time, the clay refractory bricks are moderate, easy to construct and have a high cost performance. When selecting and using clay refractory bricks for 1300 degree molten iron ladle, we need to consider comprehensively according to the specific use conditions and requirements to ensure that the most suitable products are selected.
Molten iron ladle is a container for temporary storage or transportation of molten iron, the protective layer of a variety of refractory bricks is used inside the ladle, and the use of clay refractory bricks at 1300 degrees of the ladle is a good choice, and the refractory materials used in the ladle should be selected according to the specific part, please see the detailed introduction below.
The ladle is operated under alternating high and low temperatures, and the longer the interval period, the more severe the lining damage. Therefore, the ladle lining should generally choose corrosion-resistant, high-strength, thermal shock-resistant refractory materials. When the molten iron ladle is desulfurized, the molten iron moves violently, which aggravates the corrosion of the refractory material, and the materials of the current masonry ladle include general clay refractory bricks, general high-alumina bricks, fine clay bricks, pyrophyllite bricks, and aluminum-silicon carbide castables.
Physical and chemical indicators
Molten iron ladle 1300 degrees with clay refractory bricks, also known as clay bricks, with clay clinker as aggregate, refractory clay as a binding agent made of Al2O3 content of 48% refractory products. The refractory degree of clay bricks is as high as 1690 1730, and it is often used as heat boilers, glass kilns, cement kilns, fertilizer gas furnaces, blast furnaces, hot blast stoves, coking ovens, electric furnaces, bricks for casting and pouring steel, etc.
The raw materials of clay refractory bricks are abundant, the manufacturing process is simple, the raw material cost is low, the operating temperature is about 1400, and there is a certain resistance to acid and alkaline slag, so it is widely used in metallurgical production to meet the application requirements of 1300 degrees of molten iron.
When the desulfurizer of the molten iron ladle is baking soda (Na2CO3), it will directly melt the refractory and accelerate the damage at the slag lineWhen calcium carbide is selected as a desulfurizer, the slag will become sticky and easy to hang on the wall of refractory materials, making it difficult to finish. If the molten iron contains high manganese and phosphorus, and the silicon content is low, and the temperature of the molten iron is high, the damage to the refractory material is also relatively large. The desulfurization treatment agent is lime, fluorite or calcium carbide;The desiliconization treatment agents are iron scales and lime;The desulfurization treatment uses Feo-Cao-CaF2 or soda Na2CO3.
In the process of dephosphorization, desiliconization and desulfurization, the alkalinity of the slag changes greatly, from 05 to 3Above 0, the corrosion of refractory materials is severe, coupled with the erosion of agitated molten iron, and the temperature fluctuation caused by intermittent operation, the damage of refractory materials in the lining of the molten iron ladle, especially in the slag line part, is aggravated.
According to the working environment of the molten iron ladle, the requirements for the refractory materials used are high compressive strength, good slag resistance (both acid and alkaline slag resistance), good thermal shock resistance, good shedding resistance, and fine structure. Generally, clay bricks, high-alumina bricks, impregnated bricks, magnesia carbon bricks, silicon-aluminum bricks, and some refractory castables and spray coatings are used.