Refractory Brick Converter Furnace Lining

Refractory Brick Converter Furnace Lining

Converter furnace is a high temperature metallurgical equipment and must be stacked with refractory materials. In particular, the inner refractory 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, etc., which is more demanding on refractory materials. The function of the refractory material is not only related to the life of the refractory lining, but also affects the quality of the steel.

The converter furnace refractory brick lining consists of a working layer, a filling layer and a permanent layer. The furnace of working layer is directly touched by molten steel, slag and furnace gas, and 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, and can be used to burn magnesia brick, tar combined with magnesia ,refers to the construction of refractory bricks, etc., generally do not replace when repairing the furnace.

The damage mechanism of the furnace 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, erosion and heat loss occurs, which eventually leads to the damage of the refractory lining. Because the working conditions of the various parts of the converter refractory lining bricks 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 temperature furnace gas, the splash of the furnace is often attached with slag and metal, and when the attachment is finished, it is mechanically hit, and 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, and is not easy to stick steel, even if the steel is easy to be finished. Therefore, the high-strength magnesium charcoal 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, and 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, and 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 refractory lining is not covered by the slag layer, so the carbon in the lining fire 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 magnesia carbon refractory 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, and the sudden change of temperature, the damage is more severe, so the masonry 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.

Converter Refractory Brick Construction

1.Masonry at the bottom of the furnace:

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 fire brick. The third layer of magnesium brick is placed on the lower edge of the flange, and the gap between the firebrick and the flange is filled with refractory material.

2.Masonry at the bottom of the furnace:

1) 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 bricks. 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 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 refractory materials are used to cut the holes under the venting bricks. .

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

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

3.Masonry work layer masonry:

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

2) 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 brick and the pipe, and the firebrick. The lining and the furnace shell are filled with refractory materials, and the seam is not clamped within 1m of the tapping area. The refractory brick joint is not more than 1mm.

3) 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 refractory material.

High Chrome Bricks

High Chrome Bricks Introduction

High chromium brick as a kind of hot-sales refractory bricks for furnace application in Rongsheng factory manufacturing with chemical industry, chemical industry kiln, alkali-free glass fiber kiln, key parts of waste incinerator,refractory high chrome brick is made of corundum and fused chromium oxide as the main raw materials, together with additives such as fine powder, which are kneaded, formed, dried and fired at a high temperature in a shuttle kiln.High chrome bricks have good properties of excellent thermal shock stability and high temperature creep performance.There are high quality high chrome bricks for sale cheap in RS Company can provide standard chrome brick size specification and category as well as competitive price & high-grade quality high chrome fire bricks products,other specification and size of high refractory chrome bricks according to customer requirements,welcome to contact us or email us for free quote or price list.

High Chrome Bricks Properties

1. Refractory Chrome Bricks have acid corrosion resistance

2. Refractory Chrome Bricks have alkali corrosion resistance

3. Refractory Chrome Bricks have thermal shock resistance

4. Refractory Chrome Bricks have high temperature resistance

5. Refractory Chrome Bricks have high temperature strength

6. Refractory Chrome Bricks have excellent wear resistance

7. Refractory Chrome Bricks have high temperature resistance

8. Refractory Chrome Bricks have high temperature stability

9. Refractory Chrome Bricks have excellent thermal shock resistance

High Chrome Bricks Specification

Index Item Item		RS-75	RS-85	RS-90	RS-95
Cr203	%	75	85	90	95
Cr203+Al2o3+Zr203	%	98	98	98	98
Sio2	%	0.2	0.2	0.2	0.2
Fe2o3	%	0.3	0.3	0.3	0.3
K2O+Na20	%	0.2	0.2	0.2	0.2
Apparent Porosity	%	18	18	16	16
Bulk Density	g/cm3	3.9	4.2	4.22	4.25
Cold crushing Strength	Mpa	120	120	120	120

High Chrome Bricks Application

High chromium bricks are mainly used in the chemical chemical industry, chemical industry furnaces, alkali-free glass fiber furnaces, the key parts of waste incinerators. Water based slurry pressurized gasifier and other related reducing atmosphere industrial furnace working lining.

Rongsheng Factory Testing High Chrome Bricks

Improve Service Life of High Chrome Bricks

In order to effectively improve the physical properties of high chromium fire bricks at room temperature, high refractory chrome bricks can resist the erosion performance and prolong its service life in the coal-water slurry pressurized gasifier. Under the conditions of carbon sequestration, it is fired at 1350℃, 1540, and 1550 ℃ respectively. Compared with the calcined sample in air at 1700 ℃, Rongsheng factory studied the effect of the firing atmosphere on the bulk density, apparent porosity, normal temperature high pressure strength and resistance to slag penetration of high chromium bricks. The results show that with the increase of temperature, the apparent porosity of high chromium bricks decreases and the bulk density increases, while the 1450℃ carbon fired high chromium bricks have the highest normal temperature compressive strength, reaching 214Mpa; the carbon-buried performance significantly reduces the high chromium refractory bricks. The firing temperature and the improvement of its remarkable structure; the slag penetration resistance of the high chromium fire bricks buried at 1450 ℃ is better than 1700 ℃.

Porosity refinement may be an important way to improve the anti-penetration ability of refractory high chromium bricks, which largely prevents or reduces the penetration of slag, thereby minimizing the structural spalling of high chromium bricks and effectively extending their service life.

Rongsheng Factory Testing High Chrome Bricks

1.High Chrome Bricks Temperature

In the influence of the firing temperature on the microstructure of high chromium bricks, Rongsheng used scanning electron microscopy to analyze the microscopy of high chromium bricks after firing at 170 0 ℃, 174 0 ℃, 1780 ℃, 182 0℃ and 186 0 ℃. The results show that the firing temperature of the high chrome brick is not as high as possible, but a suitable firing temperature of 174 0 ℃. The high chromium brick prepared at the firing temperature has a moderate grain size of Cr2O3 in the matrix, a dense matrix structure, a tight bond between the matrix and the particles, no crack, and the best mechanical properties.

2.Effect of Iron Oxide Content on High Chromium Brick

When the content of iron oxide in the coal slag is high, the ash fusion temperature of the coal slag is lowered, and the osmosis erosion of the refractory material is serious. Although a so-called composite spinel protective layer can be formed at the interface between the slag and the refractory material, the life of the refractory material is raising it will not have a significant effect, but will reduce high chrome refractory bricks service life.

High Chrome Bricks Package

Fireproof chome bricks package is general export package-general fumigation wooden pallet , paper corner protector, plastic-steel belt and plastic shrink film protected outside, neutral package or as client's requirements.

Where to Buy High Chrome Bricks - RS Factory

RongSheng refractory factory has been engaged in refractory material industry for more than 20 years.RS refractory have a excellent technological team and have the professional sales team.

Rongsheng firebricks manufacturer can provide specification and category as well as competitive price & high-grade quality bricks products.Rongsheng firebricks factory can provide refractory high chrome bricks density, standard chrome brick size according to client requirements.

Steel Ladle Refractories Damage Causes

Steel Ladle Refractories Damage Causes

First, the ladle refractory is used to transport high temperature molten steel. During the transportation process, high temperature molten steel and molten slag around 1680 ℃ scouring and eroding it, especially in the slag line area, and the erosion erosion is more serious, which is an important factor determining the service life of a tank.

Second, the refining treatment outside the furnace such as LF is serious for the destruction of unburned fire bricks.

Third, the refractory lining is subjected to severe temperature changes during tapping and outflow of molten steel, and thereby causes cracking and flaking of the lining refractory material.

Fourth, when the refractory ladle is loaded into the molten steel in the converter, the high temperature molten steel has a strong mechanical scouring on the bottom, so that the lining refractory material at the part is prone to damage due to thermal shock.

The damage mechanism of ladle refractories is mainly caused by high temperature slag erosion and penetration. The ladle slag line is mainly melted, and the side wall portion is cracked and thermally peeled off due to the penetration of the slag. The rate of melt loss is related to the slag temperature, viscosity, and the rate of reaction of the refractory material. The high temperature of the molten steel, the long residence time in the bag, the low viscosity of the slag, the pore penetration of the matrix material, the liquid phase penetration and the diffusion in the solid phase cause a qualitative change in the composition and structure of the material surface to form a dissolution. A higher degree of metamorphic layer is prone to spalling and accelerates the damage of the lining refractory brick.

The lining of refractory materials with the same chemical composition or different varieties has different damage speeds due to their different structures and properties. The refractory ladle can not be operated continuously, so that the temperature of the refractory lining is reduced or even cold packed, and the refractory lining structure peeling off is easy to occur, and the service life of the ladle is reduced.

The erosion of the refractory material by the slag is not limited to the dissolution of the surface, and the slag can infiltrate the inside of the refractory material, enlarge the reaction area and depth, and change its composition and structure near the surface of the refractory material to form a highly soluble metamorphism. Layer, accelerated damage, the proportion of such intrusion is roughly proportional to the porosity. Therefore, even if the chemical composition of the refractory material is the same, the melting loss rate is significantly different due to its different structural structure.

The higher the open porosity of the refractory material, the faster the slag intrusion rate, and the intrusion ratio is approximately proportional to the porosity. Even if the fireproof refractory material has the same apparent porosity, the shape, size, and distribution of the pores are different, and the erosion rate changes.

Refractory Ladle Lining Feature

1. Dense and uniform structure.

2. High temperature micro-expansion.

3. Good volume stability; high strength.

4. Low ratio of medium temperature strength to high temperature strength.

Refractory Ladle Lining Man- Made Causes

1.Improper selection and mismatch off fireproof refractory materials.

2.Improper use of refractory materials, such as masonry methods and unreasonable baking methods.

3.The ladle turnover period is too long to cause cold pack.

4.Improper unpacking, damage to the permanent layer of the ladle.

5.Failure to take timely repair measures.

Refractory Ladle Lining Solution

1. Improving the slag resistance of refractory materials.

2. Reducing the porosity of the refractory material and reducing the erosion passage of the slag.

3. The slag reacts with the refractory material to form a high melting point compound retaining wall to prevent the slag from penetrating.

4. Increase the viscosity of the slag. The greater the viscosity of the slag, the less aggressive it is to the refractory.

5. Understand the performance of the refractory materials used, rationally determine the conditions for use of the ladle.

6. Accelerate the use cycle of ladle as much as possible to achieve "red envelope" work.

7. The damaged part of the lining refractory material should be sprayed or replaced in time.