Slag regulating material for converter slag splash protection

Slag splashing furnace protection is a new technology developed this year to increase converter age. The basic principle is that after the final molten steel is blown, the remaining MgO content reaches the saturated or supersaturated final slag, and a high-pressure nitrogen gas of 0.8-0.9 MPa is blown at 0.8-2.0 m at the theoretical level of the molten pool using a spray gun , Spatter the slag and form a layer with a high melting point on the surface of the furnace lining. The slag-spattering layer adheres well to the furnace lining to protect the furnace lining.
The effect of slag splashing furnace protection is mainly determined by the MgO content in the slag before slag splashing. The addition of slag regulator can increase the MgO content in the slag. There are two ways to add it: adding slag adjuster after tapping to make the MgO content meet the requirements of slag splashing furnace protection; when the converter is blowing, add the slag adjuster and the slagging material into the furnace and control the final slag composition to make the MgO content meet the requirements. The commonly used slag conditioner and its chemical composition are shown in Table 1. When selecting a slag conditioner, the MgO content in the slag conditioner and its price should be comprehensively considered.

Table 1 Commonly used slag conditioner and its chemical composition（w）

Raw Material	CaO	SiO2	MgO	LOI	MgO
Metallurgical magnesia	8.0	5.0	83.0	0.8	75.8
Light burned magnesia ball	1.5	5.8	67.4	22.5	56.7
Light burned dolomite	51.0	5.5	37.9	5.6	55.5
Magnesium-containing lime	81.0	3.2	15.0	0.8	49.7
Raw dolomite	30.3	2.0	21.7	44.5	28.3
Magnesite slag grains	0.8	1.2	45.9	50.7	44.4

Article Source:Slag regulating material for converter slag splash protection
Company name：Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Introduction of continuous casting technology

Continuous casting technology is characterized by fast casting and focus investment, which was developing in a very fast speed from 1970s. At the first beginning, continuous casting only took 5.6% all over the world, while the data reached to 64.4% in the end of 21st century. And in some of the developed countries, it was even above 96%. In recent years, many steel plants adapted continuous casting technology instead of mould casting.

To compare with the traditional mould casting, continuous casting can improve metal recycle rate and low down power consumption. It can also make the melting work simple and short the melting time, in which way the production efficiency can improve in a large degree. Tundish is a middle progress of steel making, and it is the kep point which can decide continues casting or not. Furthermore, tundish would have a big effect on melten steel quantity and quality. Its functions are as following:

A.Diversion. For multi-strand continuous casting machine, the melten steel would be divided from tundish.

B.Continues casting. When multi-furnace continuous casting, tundish can be a holder when changing ladle.

C.Lowing down the presure.

D.Protecting melten steel quality. Through using covering agent, long nozzle and other protecting device, tundish can help to protect the melten steel quality.

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:Introduction of continuous casting technology
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Repair of EAF bottom

All the steel slags should be tapped out before repairing EAF bottom. Apart from the refining slag tapping during oxidizing period, slags should be tapped out or into slag ladle after tapping of molten steel. Please pay attention to the following matters:
1.The charging amount of steel srape should be decrease before reparing EAF bottom, try not to charge dolomite.
2.The tapping temperature for the heat before repairing should be 30-70℃ higher than normal tapping temperature.
3.Adjust the fluidity in order to facilitate slag tapping.
4.If there is some slag remaining in the furnace, while waiting for ladle, slag melting for heat preservation should be done, which requires making the electrodes longer to avoid power transmission failure.
5.If the tapping of molten steel is not thorough, use steel billets to adhere the molten steel until there is no molten steel left.
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：Repair of EAF bottom
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Repair of converter lining

The repair of converter lining is the key measurement for prolonging lining service life, balance lining damage and lowering cost. The following matters should be paid attention to:
1.In the total comsuption of lining refractory material, the resonable ratio of repairing material should be 1/3 to 1/2.
2.Choose suitable repairing method. The most common repairing methods are: throwing, Semi-dry gunning and flame gunning.
3.Choose suitable repairing material.
4.Use slag splashing technique to prolong the service life of converter lining.
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：Repair of converter lining
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Come to know the application of casting powder in Chinafirebrick

Mold powder is an important auxiliary material in continuous casting production. With the development of China's steelmaking and continuous casting technology, the technology of protective flux has also been continuously improved. However, in the current backdrop of fierce competition in the steel market, continuous casting is undergoing a comprehensive technical upgrade with characteristics such as specialization, constant pull, high quality, and multiple varieties. Whether China's Mold powder technology can meet the need for continuous improvement of continuous casting technology is a matter of common concern to researchers and manufacturers of continuous casting production plants and protective casting powder. What are the advantages of continuous casting and mold protection technology in China? Where are the links that restrict the steady improvement of product quality and technological development? Faced with complex varieties and continuous casting processes, and how many mold powder supplier continue to choose mold powders?

For continuous casting production to achieve high quality and high efficiency, and even to achieve heat-free hot charging defect-free billet, the correct choice and use of mold flux is very necessary. However, the most basic problem is to first understand the role of the protective slag, and how to ensure the normal function of the protective slag under the conditions of complicated and continuous casting process.
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:casting powder
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The working mode of moulding powder

Moulding powder forms ”three layers”?in the crystallizer, powder layer, sintered layer and slag layer. This working mode is the key to play the role of moulding powder.

The casting powder (1100~1200℃ melting point) on the surface of the molten steel (1500℃), heated by the molten steel and forms slag layer with 10-15mm thickness on the surface of molten steel. With the heat transfer slowed down, the moulding powder above slag layer sintered, forms sintered layer (900-600℃). And the casting powder above the sintered layer will gets fewer heat transfer, less than 500℃, so this is the powder layer. And the moulding powder covers in the molten steel surface evenly, to prevent cooling and secondary oxidation of molten steel.

During casting, the slag film between crystallizer and solidified slab shell could reduce the casting resistance and improve the heat transfer of crystallizer. As casting going , the slag layer is consumed constantly, then sintered layer becomes slag layer, powder layer becomes sintered layer, and adds more moulding powder into the crystallizer, makes the moulding powder keeps “three layers“.

Article Source: Moulding powder
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