Refractory Brick for Converter Furnace Lining

The converter furnace is a high temperature metallurgical equipment and must be stacked with refractory materials. In particular, the inner lining of the converter is subject to the chemical corrosion of high temperature molten steel and slag, as well as the scouring effect of molten steel, slag, furnace gas and the mechanical resistance of waste indium. which is more demanding on refractory materials. The function of the refractory material is not only related to the life of the lining, but also affects the quality of the steel.

The converter refractory brick lining consists of a working layer, a filling layer and a permanent layer. The working layer is directly touched by molten steel, slag and furnace gas, which is constantly subjected to physical, mechanical and chemical corrosion effects, the filling layer is interposed between the working layer and the permanent layer, generally using tar magnesia or tar dolomite. The effect is to reduce the extrusion of the furnace shell when the refractory brick lining expands to prevent damage to the permanent layer, and to remove the residual bricks in the working layer, the permanent layer is used to maintain the furnace shell, which can be used to burn magnesia brick, tar combined with magnesium, refers to the construction of refractory bricks. Generally do not replace when repairing the furnace.

The damage mechanism of the converter lining is very complicated. In general, the oxygen converter lining under the effect of physical, chemical and thermal stress, the phenomenon of mechanical wear, erosion and heat loss occurs, which eventually leads to the damage of the lining. Because the working conditions of the various parts of the converter lining are very different, the damage of the various parts of the converter lining is different, so the function of the refractory bricks for each part of the converter lining is very demanding.

The mouth of the furnace and the part of the furnace hat: firstly, it is washed by the high the attachment is finished, it is mechanically hit, the two furnaces are subjected to intense exercise during the exercise. The influence of thermal shock requires that the refractory material of the masonry has high thermal shock resistance and slag resistance, slag resistance and high temperature furnace gas scouring, which is not easy to stick steel, even if the steel is easy to be finished. Therefore, the high strength magnesium charcoal fire bricks are often used in this part.

The charging side of the lining: in addition to the corrosion of molten steel and slag, it is also subjected to the intense impact of scrap steel and the intense erosion of molten iron during charging, this effect is very severe. Therefore, the refractory material required for masonry on the converter charging side has high temperature strength, good thermal shock resistance, high slag resistance. Therefore, most of the areas used are high corrosion resistant and high thermal resistant magnesia carbon bricks.

The tapping side of the lining: less affected by thermal shock, but due to the hot scouring effect of the molten steel, the same grade of refractory material as the charging side can be used, and the thickness can be slightly thinner.

The trunnion parts on both sides: in addition to the corrosion of molten steel and slag during the blowing process, and also subjected to the erosion and oxidation of the airflow, the surface of the lining is not covered by the slag layer, so the carbon in the lining refractory brick is easily oxidized, and further damaged, It is not very good to repair, so the erosion is severe. The masonry brick with high oxidation resistance and slightly higher carbon content should be used for masonry.

Slag line: Long term contact with slag is a severe part of corrosion caused by slag. The tapping side slag line changes with the time of tapping, and the damage is not significant; but the slag side, because of the intense slag corrosion effect, plus other effects suffered by the converter belly during the blowing process, the corrosion is more severe. Therefore, high corrosion resistant magnesium carbon bricks should be used.

The molten pool part: although it is affected by the erosion effect of molten steel in the blowing process, compared with other parts, the damage is lighter, and the operation of the slag splashing protection of the converter tends to increase the bottom of the converter, so the molten pool part of the converter can be used. General magnesium charcoal bricks.

The tapping part: the tapping port is affected by the corrosion and erosion of high temperature molten steel and slag, the sudden change of temperature, the damage is more severe, so the masonry fire brick with good erosion resistance and high oxidation resistance should be built. Use all the magnesia carbon bricks, or combination of magnesia carbon bricks, and repair or replace them after using them for a certain number of times.

Refractory Brick for Converter Furnace Construction

1.Shake the converter to zero position, find the center line of the bottom of the furnace, check the air holes on the gas supply casing and the steel structure, and ensure that all the pipes and air holes are unblocked, the three layers of magnesia bricks are laid on the bottom of the furnace floor and are laid to the ventilation place. The hole is close to the furnace shell and is required to be flush with the refractory brick. The third layer of magnesia fire brick is placed on the lower edge of the flange, the gap between the fire brick and the flange is filled with refractory material.

2.The working layer of the bottom of the furnace is set up with magnesia carbon bricks. Firstly, find the center of the bottom of the furnace, and pre-assemble the masonry center firebricks. The degree of partial pain should meet the requirements. The surrounding bricks should be built according to the planned bricks, and the wrong teeth should be handled. When laying permeable bricks, the thickness of the fire bricks around the ventilated bricks is not more than 1mm. The venting pipes should be twisted according to the orientation of the venting ducts. After the venting bricks are positioned, the materials are used to cut the holes under the venting firebricks.

1) When laying the briquetting bricks, use the ramming refractory material to control the height of the briquetting bricks to ensure the flatness of the outer side of the briquetting bricks, use the alcohol resin to select the air hammer between the briquetting brick and the permanent layer.

2) The permanent layer of the furnace body is built, the cone part of the converter pool, the straight part of the furnace body, the permanent layer of the cone part of the furnace cap are made of magnesia refractory brick, with the furnace shell as the guide surface, close to the furnace shell, and the conditioning fire brick door, control the level of each ring, fill the firebrick joint with fine magnesia powder.

3).The cone part of the converter pool, the straight part of the furnace body, the cone part of the furnace cap are made of magnesia carbon brick, with the furnace shell as the guide surface, the working layer is close to the permanent layer, the expansion layer is pressed as required, and the working layer brick. The gap between the fire bricks and the permanent layer bricks is filled with materials to ensure the level of each ring; each door is closed at a door, the orientation of the door bricks is arranged between 15℃ and 30℃ of the center line of the interval tapholes. The door bricks should be staggered by at least 2~3 bricks, the processing of the door bricks should not exceed two-thirds of the original brick width.

1) When the tapping hole is built, the orientation and viewpoint of the tapping port should meet the planning requirements. The center line of the tapping port should be consistent with the center line of the furnace. Use the brine magma mud to wet the firebrick, between the refractory brick and the pipe. The lining and the furnace shell are filled with refractory materials, and the seam is not clamped within 1m of the tapping area. The fire brick joint is not more than 1mm.

2) Reserve about 100mm between the topmost brick of the furnace hat and the furnace door, weld the anchor on the furnace shell, and beat it with the ramming material.

Corundum Refractory Castable

Corundum Refractory Castable Introduction

Corundum castable as a kind of hot sales refractory castable for furnace application in Rongsheng factory manufacturing with the lining materials for various kiln such as boiler, blast furnace hot blast stove, heating furnace, ceramic kiln. Corundum refractory castable have good properties of high strength, good high temperature performance, stable volume, low thermal conductivity, strong resistance to slag penetration, erosion resistance, convenient construction, strong furnace structure. There are high quality refractory castable corundum for sale cheap in RongSheng refractory bricks company can provide refractory castable specification and category as well as competitive price & high grade quality corundum castable refractory products, other specification according to customer requirements,welcome to contact us or email us for free quote or price list.

Corundum Refractory Castable Definition

The corundum product package is rich in corundum castables, corundum can be plastic, corundum ramming material, corundum wear resistant material, corundum products use Al2O3 content greater than 90%, corundum-based refractory products with appropriate dispersant , coagulant, stainless steel fiber, compounded according to strict formula.

Corundum Refractory Castable Features

Corundum refractory castable have good sealing

Corundum refractory castable have wear resistance

Corundum refractory castable have corrosion resistance

Corundum refractory castable have high heat conductivity

Corundum refractory castable have thermal shock resistance

Corundum refractory castable have high temperature strength

Corundum Refractory Castable Specification

Item		JJG-16	JJG-17	JJG-18
AL2O3(%)		85	90	93
Sio2(%)		10	6	2
Bulk Density(g/cm3)		2.9	3.0	3.0
Cold Crushing Strength(Mpa) C.C.S Mpa	110℃*24h	80	100	80
	1100℃*3h	80	100	80
	1500℃*3h	80	100	80
Cold Pressed Antisegregation Strength(Mpa) M.O.R.MPa	110℃*24h	8	12	8
	1100℃*3h	8	12	8
	1500℃*3h	8	15	8
Hot after-line rate of change(%)	1100℃*3h	-0.1~-0.3	-0.1~-0.3	+-0.2
Max Service temp(℃）	1650	-0.1~-0.5	-0.2~-0.6	+-0.5
Construction methods		Vibration	Vibration	Vibration
Reference water volume（%）		5~6	5.5~6.5	5.5~6.5

Corundum Refractory Castable Application

1.Corundum refractory castable is suitable for the high abrasion resistance, erosion resistance and tortoise mesh of the refinery catalytic cracking equipment, cyclone separator and inclined tube device. The processing equipment such as synthetic ammonia is used for one stage and two stage reforming furnace lining pouring.

2.Corundum castable refractory material mainly used for the parts of the circulating fluidized bed boiler combustion chamber, separator and flue.

Corundum castable refractory is used for heating furnace hearth, tapping tank and cement rotary kiln kiln mouth.

Corundum Refractory Castable Instructions

1.Corundum Castable Refractory Stirring

Stirring is carried out by a forced mixer. Each bag is an integral unit. It can be stirred in multiple bags according to the actual dosage. The construction temperature is 5 ℃-35 ℃. When the temperature is low or high, the heating or cooling measures must be adopted to meet the construction temperature requirements.

2.Corundum Castable Refractory Stirring Method

firstly put the refractory aggregate and the binder into the forced mixer, dry the dry material for 2 minutes, make the color of the material uniform, and then add water for 3-5 minutes until the material color is uniform. The agitated material can be agglomerated by hand but not leaking.

3.Corundum Castable Refractory Add Water

❉ 6-8% of the weight of refractory castable materials, can be properly floated according to weather conditions, water must be clean drinking water.

❉ Refractory corundum castables must be completed within 30 minutes after mixing with water.  is strictly forbidden to return material and stir mixing construction and secondary water mixing.

4.Corundum Castable Refractory Vibrating

❉Corundum castables should be cast by insert vibrator or flat vibrator. The casting height of each layer shall not exceed 400mm. The vibration of each layer may cause the surface to be slurry. In one part, Corundum castable refractory material shall not vibrate for a long time to prevent the material particles from being graded or the template being displaced. Corundum castable refractory material must be vibrated by vibrator during construction, manual vibrating construction is not allowed.

❉The pouring material should be continuously carried out during construction. Before the initial pouring of the previous layer, the next layer of castable should be poured. If the construction gap exceeds its initial setting period, Corundum castables should be treated according to the construction joint requirements.

4.Refractory Castables Maintenance and Demoulding

After the pouring, natural curing can be demoulded after 24 hours. After the corundum castable is poured, Corundum refractory castables can be naturally cured. Castable refractory  corundum can not be watered during curing, and the curing temperature is 5 ℃ - 35 ℃. After curing for 72 hours after demolding, castable corundum refractory can be baked according to the heating curve.

Corundum Refractory Castable Supplier in Rongsheng Firebricks Factory

Rongsheng refractory manufacturer has 20 years of quality assurance, bringing maximum benefits to customers.

❉Rongsheng refractory castables manufacturer has four advantages

1.Rongsheng refractory bricks manufacture have strong production capacity, supply is guaranteed.

2.Rongsheng refractory bricks company has professional refractory brick production plants and amorphous refractory production plants.

3.,Rongsheng refractory bricks manufacture Have advanced concepts and scientific management.

Rongsheng Refractory is constantly committed to quality management, process management and cost management, strives for internal strength, adheres to the development of science and technology, wins by quality and reputation, provides technical guidance services to provide customers with quality products and services.

4.Rongsheng refractory bricks manufacture have perfect after-sales service system

From raw material procurement to final product inspection and after-sales service. Ensure that the product offered to the user is 100% qualified.

Why to Choose the Rongsheng Firebricks Factory

Rongsheng refractory bricks factory direct sales, reasonable price, provide customized services, welcome to consult. Rongsheng refractory castable manufacturer adhering to: quality first, reputation first, customer first. Scientific management, strong technical force, perfect testing methods, advanced technology and equipment, stable product quality are the guarantee of quality service.

Low Cement Castable

Low Cement Castable Feature
 
The water consumption is small, only 1/2-1/3 (about 5-7%) of ordinary refractory castables, so the bulk density is high, the porosity is low, there is no obvious dehydration stage during baking, and the thermal shock performance is good. It is comparable to baked refractory products.
 
The use of refractory cement is greatly reduced, the high temperature use performance and slag resistance of the refractory material are improved.
 
There is little hydrate or anhydrous compound after molding and curing, and there is no hydration bond damage during baking, which affects the medium temperature strength. Therefore, the inconvenience of medium temperature or high temperature does not decrease, but increases.
 
The low fire refractory castable has a refractoriness of more than 1790 ° C, and the load softening temperature (deformation 4%) at 0.2 MPa is 20 to 100 ° C higher than that of the CA50 cement refractory castable. Therefore, the use temperature is generally about 100 ° C higher than that of the CA50 cement refractory castable of the same refractory material.
 
The coefficient of thermal expansion of low cement refractory castables exhibits an expanding characteristic throughout the heating process. It can be seen that as the heating temperature increases, the thermal expansion rate increases to a maximum at 1250 ℃, which is about 0.68%. Thereafter, a slow shrinkage was started, and the coefficient of thermal expansion at 1400 ° C was 0.43%. When the temperature was 1500 ° C, the coefficient of thermal expansion returned to 0.5%.
 
Low Cement Castable Application
 
Low cement castable refractory is suitable for petroleum, metallurgy, chemical industry and various silicate kiln furnaces, such as some components of refining equipment outside the furnace, refining bag cover outside the furnace, integral spray gun for molten iron, treated steel water, electric furnace top lining body, soaking furnace, heating furnace, retreat furnace lining, tapping tank, tundish lining, high temperature burner and blast furnace tapping groove cover, ladle lining, etc.
 
The vibrating low cement refractory castable is suitable for heating furnace, various heat treatment furnace, electric furnace cover, shaft kiln, rotary kiln, blast furnace tap hole, ladle, ladle, etc. Self flowing low cement castable is suitable for metal. The lining of the high temperature refractory member of the anchor, such as the water cooled pipe lining of the heating furnace, the spray gun metallurgy integral spray gun lining, the RH, DH vacuum degasser immersed pipe lining, the ladle gas supply component and the petrochemical catalytic cracking reaction The high temperature wear-resistant lining of the device; used for the construction of complex structures, the refractory castables manufacturers of industrial can also customize the production of low cement refractory prefabricated parts according to customer needs, construction, installation, convenient and quick.
 
Low Cement Castable Advantage
 
The low cement series refractory castables are characterized by high density and high strength, which bring benefits to the use, but bring trouble to the baking, that is, improper baking, prone to flaking or bursting. Therefore, various countries have carried out various researches on the baking of low cement series refractory castables. The main technical measures are to formulate a reasonable oven curve and use an excellent explosion-proof admixture, etc., so that the moisture in the refractory castable molded body can be smoothly removed without any influence.
 
Due to the low content of calcium oxide in low cement refractory castables and less impurities, the regrind, corrosion resistance, high temperature strength and high temperature volume stability of the castable itself can be improved.
 
1. Low cement refractory castable can be used in a variety of construction methods, more convenient and fast.
 
2. Casting the inner lining with low cement refractory castable for longer service life.
 
Low Cement Castable Manufacturing Process
 
Raw material selection a variety of raw material ingredients forced mixing inspection, packaging and storage factory inspection, loading.
 
Since refractory castable is to be used within the specified time, generally 6 months, the refractory product has less inventory, but the output is high. After receiving the order, the production can be completed in a short time, or customized according to customer needs. product.
 
1. Determine the raw materials used in low cement refractory castables according to the application.
 
2.according to the formulation of raw materials, screening aggregate size and aggregate of aggregate size, determine the proportion of each raw material, and strictly control the formulation of materials.
 
3.According to the order of ingredients, firstly mix and stir the powder, then stir the aggregate evenly, mix the powder with the aggregate, and control the mixing time, generally 8-10 minutes.
 
4.Packing the stirred cast bulk material, and at the same time, it is equipped with a binder and an additive.
 
5.The installed low cement refractory castables are placed in the warehouse to prevent moisture and water.
 
Low Cement Castable Using Precautions
 
1.When storing, do a good job of moisture proof and waterproof work to prevent agglomeration of the refractory castables.
 
2.Strictly control the water consumption to ensure that the pouring refractory material is easy to construct.
 
3.The castable material produced each time is not too much, so as to prevent the castable from being used for condensation.
 
4.When baking, pay attention to the heating rate, not too fast.
 
The low cement refractory castable is different from the traditional refractory castable: in the low cement matrix, some or most of the calcium aluminate cement is replaced by a fine powder having the same or similar chemical composition as the main material of the castable. The low cement refractory castable belongs to a castable in which hydration combines and agglomerates in combination.