Ferroalloy furnace refractories include three parts: top refractories, wall refractories and molten pool refractories (furnace slope and bottom).In the process of ferroalloy smelting, different parts of refractories are in different working states.
The impact of high temperature furnace gas and spray slag on the refractory on the top of the furnace, the temperature change between feeding intervals, the radiation heat of high temperature arc light, the air flow impact and pressure change during the collapse of the furnace.
The refractory of furnace wall is mainly subjected to the high temperature radiation of arc and the temperature change during the intermittent feeding.Erosion shock effect of high temperature furnace gas and blast furnace slag;Impact wear of solid and semi-molten materials;Serious erosion and impact of slag near the slag line.In addition, the furnace body tilting, but also under additional pressure.
Furnace slope and bottom refractory mainly bear the pressure of upper burden or molten iron;Temperature change, charge impact and arc melting during intermittent charging period;Erosion impact of hot molten iron and slag.
In order to ensure the normal operation of the electric furnace, it is necessary to choose refractory and load softening temperature high, rapid cold and hot resistance and slag resistance, there is a greater heat capacity and a certain thermal conductivity of refractory materials to masonry furnace lining.
The properties and characteristics of lining refractories often used in ferroalloy production are as follows.
1. Clay bricks
The main raw material for making clay bricks is refractory clay with good plasticity and binding force.
The main performance characteristics of clay brick are as follows: strong resistance to acid slag, good quench and heat resistance, good insulation ability and certain insulation performance;Low fire resistance and load softening temperature.Clay bricks should not be used directly under high temperature conditions and special requirements.
In the production of ferroalloy, clay bricks are mainly used for laying the lining of the exposed part of mineral heat furnace, the outer lining of the wall and bottom of the furnace, or the lining of molten iron ladle.
2. High alumina bricks
The main raw material of high alumina brick is high alumina clay, and the binder is refractory clay.
Compared with clay brick, high alumina brick is the biggest advantage is, high load softening Hao degrees refractoriness, good slag resistance, mechanical strength.The disadvantage is that the high aluminum brick is not good in heat and cold resistance.
In the production of ferroalloy, high alumina bricks can be used for laying bricks at the iron mouth of mineral hot furnace, refining the top of electric furnace, and lining of molten iron ladle.
3. Magnesite brick and magnesite
The main raw material for making magnesite bricks is magnesite and the binder is water and brine or sulfite pulp waste liquor.
The main properties of magnesite bricks are as follows: high refractoriness and excellent resistance to alkaline slag;However, the thermal conductivity and conductivity at high temperature are larger, and the softening temperature under load is lower, and the resistance to rapid cooling and heat is worse.Pulverization occurs at high temperatures when subjected to water or steam.
In the production of ferroalloy, magnesite brick is used for laying the wall and bottom of high carbon ferrochrome reductive electric furnace, medium and low carbon ferrochrome converter, shaking furnace and refining electric furnace, as well as the lining of molten iron ladling containing ferrochrome and medium and low carbon ferromanganese.Use magnesite - aluminum brick instead of magnesite brick to build furnace top.Magnesite has a high fire resistance. In ferroalloy production, magnesite is often used for knotting furnace bottom, making and repairing furnace wall and bottom, and can be used as material for blocking holes or making knotting ingot mould.
4, carbon brick
The main raw materials for making carbon bricks are broken coke and anthracite, and the binder is coal tar or asphalt.
Compared with other common refractories, carbon bricks not only have high compressive strength, small thermal expansion coefficient, good abrasion resistance, high refractoriness and load softening temperature, good quench and heat resistance, but also have good slag resistance.Therefore, all smelting is not afraid of carburizing varieties of ferroalloy, can be used as mineral heat furnace lining materials.
However, carbon bricks are easy to be oxidized at high temperature, and their thermal conductivity and conductivity coefficient are large. In the production of ferroalloy, carbon bricks are mainly used for laying the wall and bottom of the mineral heat furnace which are not exposed to air.
The lining refractory material configuration and different laying methods of electric furnace can reduce the electric energy consumption of mineral thermal electric furnace, extend the life cycle of electric furnace, and thus reduce the production cost of enterprises.
Our company sells high quality high alumina brick, clay brick, silicon brick and so on for a long time, the price is reasonable, the quality is superior.Contact number: 0086-13608670776