Slide gate plates used for different types of steel melting

The slide gate board in the use of high temperature molten steel was repeatedly, use the article very critical, erosion is serious, so it need has high strength, resistance to request skateboard erosion, spalling resistance, and good properties such as wear resistance, the mediator in the casting process card not leaking steel plate. Different material of skateboards brick is suitable for the different steel species, it is in the refractory industry and some steel enterprises become the consensus, including carbon board such as alumina, alumina zirconium carbon is suitable for most types of steel, but they do not apply to high oxygen steel and steel calcium treatment, on the other hand, the carbon skateboarding is suitable for the high oxygen steel, and calcium treatment generally applicable material for the steel carbon, alkaline materials, such as magnesia board. This is because of high oxygen steel oxygen ions of the carbon oxidation at high temperature, the carbon in the skateboard skateboards brick intensity due to loss of carbon combined with lower, the structure of the organization is loose phenomenon, erosion resistance, erosion resistance of skateboards brick slash, slippery the service life of the plank brick will reduce naturally. Calcium treatment steel in molten steel the existence of strong alkaline Ca2 + ions in the aluminum and carbon, alumina, zirconium carbonaceous Al2O3 react at high temperature low temperature phase formation, corresponding, alkaline materials skateboarding is more able to adapt to this kind of steel grade.
The source: http://www.chinafirebrick.com/Company_News_76.html

The application of stuffing sand

Changxing Refractory is a Chinese leading refractory and oil fracturing proppant manufacturer & supplier with a wide range industries in high temperature field . From a refractory bricks manufacturing factory, Changxing has become a professional manufacturer with various refractory materials and oil fracturing proppant both in domestic and international market during 30+ years, whose customers covers North America, Middle East, Asia, Africa, etc.
Stuffing sand is an necessary refractory material for electric furnace taphole. Mainly made by magnesium olivine sand and fuse magnesite as raw material, adding the carbon material as additives, composite according to the specially appointed grain size and weight percent. Finally mixing them and produce filling sand. After testing , it is proved that it has good dispersion and mobility,high refractoriness, no sintering, no clogging. Also the tapping drainage rate is more than 100% and the service temperature is more than 1750 ℃。 It won’t react with molten steel and alloy composition. Storage quality does not change. So it can satisfy steel making process requirements and is the most Ideal refractory material for eccentric furnace steelmaking.
Changxing has a production line, which is base on oil & gas applied ceramic proppant, and also with 3 factories focusing on all kinds of refractory materials used for iron & steel casting, cement, glass petrochemical and ceramics industries. With abundant sources and professional techniques, Changxing Refractory would like to build a reliable and efficient platform for customers all over the world.
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Cement kiln SNCR denitration technology

1.The SNCR Denitration Process
SNCR system of flue gas denitration process is completed by the following four basic processes:
(1)To receive and store reductant;
(2)Reducing agent of measuring output, mixed with water dilution;
(3)In the boiler proper place injection diluted reductant;
(4)Reducing agent mixed with the flue gas denitration reaction

2. The Problem of Cement Kiln SNCR Denitration
(1) Amino reducer (NH3), urea reaction features and additive modification method;
(2) Reducing agent is sprayed into the area of the composition and temperature, atmosphere, dust concentration, as well as reducing agent in the retention period of SNCR reaction temperature range;
(3) The effect of ammonia nitrogen ratio on the denitration efficiency and high ammonia escape sequence of pipeline jam, pollution;
(4) Reducing agent and gas mixed problem quickly.

3.The Main Factors Influencing the SNCR Denitration Efficiency
Experimental results show the main factors influencing the SNCR denitration efficiency：
(1) Temperature range (850 ~ 1 050 ℃).
(2) The retention time (0.1 ~ 0.5 s);
(3) The ammonia nitrogen ratio (1 ~ 2);
(4) Reducing agent and the mixing degree of flue gas.
(5) The denitration efficiency of SNCR technology is also related to the content of O2, CO content. When c (NH3)/c (NOX) for 12 or so, the efficiency is as high as 80%.But if c (NH3)/c (NOX) is too high, will cause the penetration of NH3, which produce secondary pollution.

Except these, there are other different refractory material in our factory, and all of them have been used by many companies .
The source:http://www.chinafirebrick.com/Company_News_74.html

The foundry-related characteristics of chromite sand

1.Excellent chilling performance, it can affect temperature gradient without decreasing heat cracks, promote directional solidification without using chills;

2.It is inactive, therefore it doesn’t react with metallic oxide and won’t be wetted by molten manganese steel.Chromite sand can be successfully used with manganese steel casting. If the painting of casting mould is good and with low silicon oxide, there won’t be iron olivine reaction;

3.Low linear expansion. Linear expansion is one of the factors that causes sand inclusion in casting mould. Therefore chromite sand can be used to mix green sand mold for heavy casting;

4.Through fine grain sintering, with chilling performance and high residue hot strength, chromite sand can eliminate metal penetration;

5.It is universal, can be used with all kinds of binding agent;

6.No harm for human health.
The source:http://www.chinafirebrick.com/Company_News_73.html

The application of aluminum silicate fiber products

Aluminum silicate fiber and ceramic fiber is a new type of lightweight refractory materials, the material has the advantage of light unit weight, high temperature resistance, good thermal stability, low thermal conductivity, low heat capacity, good resistance to mechanical vibration, small thermal expansion and thermal insulation performance is good, which wait for an advantage. Through special processing, it can be made into aluminum silicate fiber board, aluminum silicate fiber mat, aluminum silicate fiber rope, aluminum silicate fiber blanket, etc. New type sealing material has high temperature resistant low thermal conductivity, volume weight is light, long service life, tensile strength, good elasticity, non-toxic characteristics, is a new kind of material instead of asbestos, widely used in metallurgy, electric power, machinery, chemical heat insulation equipment.

Aluminum silicate fiber is a kind of high temperature resistant fiber. It has the advantage of light unit weight, high temperature resistance, good thermal stability, low thermal conductivity, mechanical shock resistance, elastic, sound insulation, electrical insulation and chemical stability is good, which wait for a characteristic. In metallurgical, chemical, electric power, machinery, industrial furnace such as high temperature insulation filling equipment used for high temperature furnace, kiln temperature preservation and other projects. It also can be used for high temperature sealing, filtering, noise elimination, catalyst carrier and reinforced composite materials. Aluminum silicate fiber products have board, blanket (mat), tube, rope, brick, etc. They used for high temperature furnace, kiln thermal insulation layer and filling production of fiber products.
The source:http://www.chinafirebrick.com/Company_News_72.html

The discussion on ladle slide gate plate and lower nozzle

During our visits to many steel companies around the world, we found that some of them focus too much on the service life of ladle slide gate plate and lower nozzle, some even ask for more than 10 heats, here are some of our opinions on this condition:

1.Longer service life slide gate plate and lower nozzle leads to more accidents. After being used for some time, leakages are tend to happen at the joints or molten steel could penetrate from the bodies. In addition to that, workers has different opinions on the using conditions of them, if a certain long life is fixed, accidents could easily happen;

2.Longer service life not necessarily mean less or easier work. Everyone knows Chinese steel industry is very mature, but the Chinese steel plants prefer one heat ladle slide gate plate or four heats at most, that’s because the sliding mechanism they choose is very easy to operate, it takes only less than 1 minutes to change the slide gate plates and lower nozzle, many of the long service life ladle slide gate plate and lower nozzle are with sliding mechanisms take 10 to 20 minutes to do that, which would affect the production procedure and increase workload;

3.Longer service life not necessarily equals to lower cost. The prices for long service life ladle slide gate plate and lower nozzles are normally very high, if something happens and the production has to be stopped, the ladle slide gate plate and lower nozzle can not be used again after cooling, which will be wasted.

Overall, we think it will be better if the customers choose ladle slide gate plate and lower nozzles according to their practical needs, not just based on which are with longer service life.
The source :http://www.chinafirebrick.com/Company_News_71.html

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 melton steel directly, where is of high thermal load, heavy chemical mechanical erosion. So high quality refractories 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 refractory 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 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.
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Introduction of carbonized rice husk covering agent

The covering agent mentioned in the title is a kind of refractories. It is a particulate carbonized rice husk covering agent, which includes 44-52% bran shell powder, 29-33% vermiculite, 9-11% cement clinker and 7.8-8.5% cassava flour, also includes 2.5-3.5% expanded graphite. It’s characterized to improve the thermal expansion coefficient of the covering agent.

The particulate carbonized rice husk covering agent is in ball shape, particle size is 3mm-10mm, to ensure the spreadability. This kind of covering agent has quite good coverage density and uniformity of spreading, to guarantee its good insulation effect, which is widely used in small and large Tundish.

It can reduce the rate of liquid steel recycling caused by cold casting and junction plug single-flow phenomena, in that case, it will help improving the steel production efficiency, reducing economic losses. Moreover, it will cause less dust during using, which will help to improve the refractories site operating environment, and also is benefit for the operators’ physical and mental health.
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Function and classification of ladle shroud

Ladle shroud, also named as long nozzle, as a refractory product it is used as a connection nozzle between Ladle and Tundish. In order to keep the molten liquid from being oxidized and splattered when it flows from ladle to tundish, a shroud is needed to be installed underneath the ladle. One side is connected with lower nozzle, and the other side inserts into the tundish for casting in a sealed condition.
Ladle shroud function is stated as follows: Protect the molten liquid from oxidized, which could improve the steel quality accordingly; Reduce the deposition of oxidation material stacking on nozzle surface, prolong its service life; Ladle shroud can be used for many times, so it reduce the refractory consumption to some content.

Ladle shroud is characterized with following properties: excellent thermal shock resistance; good mechanical behavior and resistance to shake or vibration; High erosion resistance to molten liquid and slag; it is equipped with airtight device at the joint.

There are two types of ladle shroud, which are classified as quartz and aluminum carbon based. Those two types ladle shroud both have good resistant ability to thermal shock and erosion, high mechanical strength. However, compared with aluminum carbon shroud, quartz shroud is comparatively easy to react with Fe and Manganese containing in the liquid and slag, which is not good for liquid purity either.
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Come to know more about Classification and application of Monoblock Stopper

Monoblock stopper?is formed by static pressing. The shape and size depend on the capacity of tundish, the height of steel surface, horn shape of tundish nozzle and aperture size. Monoblock stopper head is monoblock stopper hollow with argon blowing hole and air plug. The key point is fixing method. One type is fixed by metal pin. The other type is fixed by screw thread.

The main function of monoblock stopper is used for on-off of tundish. It can not only control the flow of the molten steel from tundish to crystallizer automatically, but also can blow the argon and other inert gas to tundish by the argon blowing hole to purify the molten steel.

Generally the material of?monoblock stopper?is aluminum carbon material. The head of the stopper rod is provided with an argon blowing hole or a gas permeable plug. When casting, the argon is blown to submerged entry nozzle by blowing hole or air plug. It enters the molten steel with fine shape. Then reducing the aggregation of Al2O3 and the deposition in the submerged nozzle to prolong service life of monoblock stopper.
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