The application of converter tapping hole

The tapping hole of the converter is the channel through which the molten steel flows from the converter to the ladle. It is one of the key refractory components of the converter. Tapping the tapping process to achieve the steel slag separation process to reduce the flow of molten steel into the ladle caused by steel pollution, also reduces the burning of alloying elements. At the same time, the steel flow at the tapping hole strongly agitates the ladle molten steel and promotes the slagfloating and the deoxidation products to float up, which not only affects the production efficiency of the molten steel smelting but also the quality of the molten steel.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.
Article Source:The application of converter tapping hole
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Factors Affecting Refractory Materials for Electric Furnace Cover

1.Arc radiation
When the electric furnace is smelted, the arc temperature generated by the discharge of the electrode is as high as 3000 ° C or more, and the small furnace cover working face is subjected to severe melting loss.
2.Thermal shock
The arc heating, tapping and the rotation of the furnace cover to the outside of the furnace cause quenching and rapid heat, which causes the furnace cover to generate thermal stress and cause the working surface to peel off.
3. Chemical attack
The molten steel and slag are sprayed onto the working surface of the furnace cover, and some of the chemical components chemically react with the working surface and penetrate into the working surface to form a metamorphic layer.
4. Electrode spray water
The use of spray water on the electrode not only reduces the electrode consumption, but also causes the temperature around the electrode hole to decrease, thereby suppressing the high temperature melt loss to some extent. If this measure is not used, the electrode hole damage will be aggravated, mainly as reaming.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source : Factors Affecting Refractory Materials for Electric Furnace Cover
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Refractory Materials for Electric Arc Furnace Working Layer

For electric arc furnace, the key point effecting service life is working layer. Working layer would touch with melton steel directly, where is of high thermal load, heavy chemical mechanical erosion. So high quality refractory materials should be adapted in working layer.

Regular lining method for EAF working layer is namely sintering, vibrating and brick-construction. For brick-construction method, asphalt binder magnesia brick is widely used. For sintering and vibrating method, magnesia sand with tar as bonding agent are normally used. In nowever days, brick-construction and sintering method are gradually eliminated because of low service life and less applicability. For high power EAF, dry magnesia vibration mix is widely used. After powerful ramming and the density requirement, the mix can be sintered into overall under certain temperature, and a good service life can appear. In regular condition, service life of dry vibration mix can reach 300 heats. After one time hot-repairing, the service life can be as long as 500-600 heats. With this method, furnace stopping time would decrease, and steel unit cost would also low down by a large degree, then the steel plant profit would increase a lot.

Article Source：Refractory materials for electric arc furnace working layer
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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The refractories trend for EAF cover

Electric furnace cover with refractory material development trend is: brick - prefabricated block - the overall pouring. 

For alkaline fire brick cover, electric tile with magnets. In order to ensure the stability of the furnace cover structure and reduce the deformation and peeling of magnesia, the use of iron plaster or masonry insert iron. As the metal induced current (especially high power electric furnace cover), the formation of local overheating to non-magnetic steel fire brick, on the other hand pure magnesia brick linear expansion coefficient is too large, the amount of small. 

In addition, the whole pouring the cover. The use of the overall casting furnace cover to promote the life of the furnace to further improve. After the water is cooled, the electrode is also water-cooled around the electrode, and the high-alumina ultra-low cement castable containing 3% Cr2O3 is added from the material and the stainless steel fiber is added. The furnace cover is used in the case of slightly repaired 594 furnace and service life is 4 times than before.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source：The refractories trend for EAF cover
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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How to choose insulating bricks

Insulating bricks used in thermal equipment can greatly reduce heat loss and furnace weight and increase thermal efficiency and labor productivity.
For most thermal equipment, to save energy and improve working conditions, insulation is necessary. However, insulation for certain equipment is not necessary because of the advantages and disadvantages of insulation. Therefore, in the actual situation and the performance of the insulation brick should be considered when selecting suitable insulation bricks.

The principles for selecting insulation bricks include:

1.It should not affect the service life of the entire refractory masonry;

2.For high-temperature furnaces that work continuously, general large-area insulation is reasonable and can reduce heat loss. However, for some special areas, such as open hearth roofs, insulation can reduce the service life. For periodic working furnaces, regenerative heat loss is a major factor in heat loss. Insulation can increase the temperature of the masonry and increase the heat of regeneration. Therefore, it is determined whether the regular working furnace should be insulated after calculating the heat storage and heat loss.

3.Because insulating bricks have high porosity, they cannot withstand excessive loads and should not be in direct contact with molten metal, slag and high temperature dust.

4.Insulation bricks have low strength. Brick joints and expansion joints should be properly disposed to avoid damage due to volume expansion. Insulating refractory fire bricks should not be subject to strong mechanical vibration, shock and friction;

5.Since the insulating brick has a large reheat linear contraction, the maximum working temperature should be less than 100℃?than the firing temperature.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:How to choose insulating bricks
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Function of Refining Slag

In order to take with the problem of serious erosion of ladle lining during the desulfrization of LF refining, LF refining slag is adjusted and calcium aluminate system substituted fluorine free refining slag with fluorine. After the adjustment of the slag, the erosion conditions on ladle were improved greatly and refining number, refining ratio and remaining lining thickness after demolishing all increased substantially. The liquidity of new slag system and desulfrization effect could meet the production requirement.

Factors which would effect refractory to dissolve with slag contains as following,?chemical composition and properties of slag; slag refractory component saturation concentration and the actual concentration difference; the reaction product of slag with Refractories; viscosity of slag. For steel mill with refining ladle, especially on Wall slag line, the use of magnesium aluminum carbon brick building, MgO as the main oxides, it is classified as basic refractories. The higher the alkalinity of slag, its ability to dissolve erosion weaker; dissolution erosion rate of slag refractory drank proportional to the difference between the actual concentration of a slag refractory component Cs and the actual concentration Co. Cs-Co larger Refractories in slag dissolution rate will be. The slag viscosity increases, will reduce the rate of dissolution of refractory, refractory damage weakened.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Function of refining slag
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Construction of Converter Refractories

The converter is an upright cylindrical smelting furnace that does not require an external heating source and mainly uses liquid pig iron as a refractory raw material for steel making. According to the nature of the furnace lining refractory, it is divided into two types: acid converter and alkaline converter. According to the part of the gas blown into the furnace, it is divided into a bottom blowing, a top blowing, a side blowing and a top-bottom composite blowing converter. Bottom blowing, top and bottom composite blowing converter bottom design breathable fire bricks. When laying, you need to locate the position of the ventilation bricks. The bottom blowing and side blowing blowing furnace bottoms are not designed with ventilated bricks, and the bottom of the furnace is relatively simple.
According to the bottom drawing of the converter, the production of magnesia carbon bricks for the bottom of the furnace is arranged, and each type of brick is used for production. The center brick of the bottom is processed bricks. According to the physical and chemical indicators of the design materials, the appropriate magnesia carbon bricks are selected for bonding processing. After processing, the cross reference line shall be drawn on the plane of the upper part of the center brick to provide a reference for positioning the ventilating bricks in the subsequent pre-laying and determining the position of the steel side and the steel side.
Breathable bricks need to be pre-made models. The model is generally made of wood. If the size is too small, it can be replaced by other refractory materials such as magnesia carbon brick. When processing ventilated bricks, special attention should be paid to technical indicators such as slightness, diagonal difference, and distortion. The dimensional deviation of the permeable brick directly affects the masonry of the steel mill. When making a ventilated brick mold, the dimensional tolerance should be controlled as a negative rule as much as possible. If it is a square rule, the steel factory may have a large gap around the ventilated brick.
In addition to the above refractory materials, it is also necessary to prepare sand at the bottom of the furnace (3mm-1mm), grinding tools, cutting machines, rubber hammers and other auxiliary materials.
Article Source:Construction of converter refractories
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Some measures to improve the life of ladle slag line bricks

1. Optimize the refined slag system

The light burned dolomite is added during the refining process to increase the MgO concentration in the slag, increase the alkalinity and viscosity of the slag, control the amount of slag under the converter, and reduce the FeO content in the slag. The alkalinity of the refining slag is controlled in the range of 4.2~5.0, and the FeO content in the slag is controlled at about 0.5%. At the same time, the viscosity of the slag is adjusted, and the MgO content in the slag is controlled at about 12%, which can effectively reduce the erosion of the slag on the magnesia carbon brick.

2. Improve slag brick material

The higher the purity of magnesia used in magnesia carbon bricks, the less B2O3 in impurities, and the higher the corrosion resistance of lining bricks when the proportion of carbon to sulfur is high.

The material of the slag-line magnesia carbon brick is improved, and the fused magnesia with high purity is used as the refrafctory raw material, and the carbon content is controlled at about 14%, which can effectively improve the corrosion resistance of the slag line.

3. Control the argon blowing system and the power supply system

The LF furnace adopts an argon blowing mode combining intelligent argon blowing and manual control. By manually controlling the intermittent stirring of large argon gas, the heat transfer of the steel slag near the electrode is promoted, and the slag temperature is too high to cause destructive erosion of the magnesia carbon brick. The VD furnace uses a staged argon control mode. At the same time, the refining and energizing system is controlled. When the power is turned on, the high voltage and low current long arc operation is adopted. After the slag is formed, the low voltage and high current submerged arc operation is used.

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The performance advantages of high alumina refractory castables

The prefabricated furnacecover adopts assembly process, so the installation is convenient and rapid;
At the same time, due to the use of casting molding powder, the unsafe factors such as peeling off pieces or falling fire bricks are eliminated, and the installation period of the furnace cover can be significantly shortened and the production cost can be reduced.
However, high-aluminum refractory castable prefabricated furnace cover is superior to the high-aluminum brick cover, the key is the length of the thermal insulation performance.
Since the percentage of raw material quota for high-aluminum bricks has been standardized, once the kiln is fired, its physical performance parameters have been determined. Therefore,the high-aluminum brick can be considered unchangeable. The precast block casting material is mainly made of high-aluminum raw materials, and MgO, Cr2O3, ZrO2, etc. are added at the same time. The parameters such as thermal conductivity, thermal expansion coefficient and elastic modulus of the casting material can be changed with the percentage of each component, which indicates the prefabricated furnace cover is controllable.

Article Source:High alumina refractory castables
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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