2017年5月24日星期三

Converter magnesia carbon brick

Converter magnesia carbon brick
Changxing Refractory magnesia carbon brick factory is located in the magnesium capital of China, and products with high bulk density and low porosity.
Magnesia carbon brick for converter
Magnesite and graphite as the main refractory raw material for the converter lining made of magnesium carbon refractory material products.
Performance converter magnesia carbon brick with high temperature, slag resistance, good thermal shock resistance, high temperature strength and so on. But its disadvantage is easy to oxidize in use, can be improved by adding antioxidants. Its physical and chemical properties see table.
The main raw material for the production process is fused magnesia or high purity sintered magnesite and high purity graphite. Generally, MgO is larger than or equal to 95%, and the c content in graphite is more than or equal to 94%. With phenolic resin or asphalt as a binder, according to the use of conditions to select the appropriate additives, by ingredients, kneading, molding, heat treatment made after the finished product. (See magnesia carbon brick) used in the smelting process, due to the use of various parts of the converter conditions and damage are different. In order to achieve a balanced corrosion, for different conditions of use of the converter parts, the choice of MgO-C bricks grades and quality are also different.
Furnace mouth, furnace cap parts of the temperature changes drastically, by the slag corrosion is more serious, should use good thermal shock resistance, slag resistance of magnesia carbon brick. Trunnions on both sides in addition to the role of damage when blowing, the surface without covered with slag layer, easy to repair, easy to oxidize the brick. Should be masonry good slag resistance, good oxidation resistance of high quality magnesia carbon refractory brick. Slag line parts and slag long-term contact, by slag corrosion serious, to be masonry and into the direct impact of scrap and molten iron and erosion. Should be used with a strong anti-slag, high temperature strength, good thermal shock resistance of magnesia carbon brick. Hearth, the bottom of the furnace compared with other parts of the erosion of light, the choice of ordinary magnesia carbon brick, when the top and bottom composite blowing technology, especially at the end of CO2, O2 and other gases, the damage is more serious. Should use good oxidation resistance, good thermal shock resistance, high temperature strength, high slag resistance of high-grade magnesia carbon brick. According to the different parts of the converter, the corresponding performance of magnesia carbon brick is to improve the technical indicators of the converter and effective method.

Application of magnesia carbon brick in Converter Lining

magnesia carbon brick
Changxing Refractory is able to manufacture magnesia carbon brick for every ladle, EAF, and BOF. We will design you a well-balanced lining, providing optimal performance at the lowest possible cost. Our magnesia-carbon brick is made from more than 98% electrically fused magnesite, high purity graphite and metallic antioxidants as needed. Size and specification can be tailored according to furnace type. 
In the smelting process, the use of various parts of the converter conditions, damage is different, for different conditions of use of the various parts of the converter, the masonry refractories are not the same.
(1) furnace mouth: As the furnace temperature changes drastically, slag and high temperature exhaust scouring more powerful, and in the removal of scrap and feeding, the furnace was hit, so the furnace for the refractory material must have a high resistance Thermal shock resistance and slag resistance, to resistance to slag and high temperature exhaust scour, and not easy to hang steel and easy to clean.
(2) furnace cap: the furnace cap is the more serious parts of the slag corrosion, but also by the temperature changes, as well as the oxidation of carbon and dust, such as the role of scouring, so the need for strong slag resistance and thermal shock resistance magnesia carbon brick.
(3) Filling side: The splashing of slag and molten steel is easy to cause chemical erosion, abrasion, erosion, and charging on the charging side. It is also affected by the direct impact and erosion of scrap and molten iron Serious mechanical damage, so the requirements of MgO-C bricks in addition to a high slag resistance and a high high temperature strength, but also must have a very good thermal shock resistance, usually by adding antioxidant high-strength magnesia carbon brick.
(4) the steel side: the steel side of the basic damage from the mechanical damage when the thermal shock is also smaller, but by the tapping of molten steel when the thermal shock and erosion, damage faster than the loading side of the small When the same material as the charging side is used, in order to maintain the equilibrium life of the converter charge, we use masonry with a thickness in the form of a thin side.
(5) slag line parts: slag line is the long-term contact with the slag and slag corrosion serious parts, in the tapping side, with the slag position with the tapping time changes, and more obvious. In the slag side, due to the strong impact of the slag erosion and the other effects of the abdomen caused by the abdomen in the process of blowing, the damage is serious, so we need to masonry with good slag resistance of magnesia carbon refractory brick.
(6) trunnion on both sides: both sides of the trunnion in addition to the role of damage when blowing, the surface of the protective layer of the cover, not easy to repair, so the charge material in the carbon easily oxidized, and thus damaged, Excellent slag resistance, high oxidation resistance of high-grade magnesia carbon brick.
(7) hearth and bottom: these parts in the blowing by the severe scouring of molten steel, but compared with other parts of the damage to a more tired, the choice of low carbon content of magnesia carbon brick can also be used tar dolomite brick The When the high-speed blowing and the pool is too shallow, the bottom of the furnace site damage may be serious. In addition, when the use of bottom blowing, these parts of the damage may increase, should be used and the furnace side of the same material.

2017年5月16日星期二

Magnesium Carbon Brick Product Consumption Knowledge

magnesia carbon brick
Changxing Refractory magnesia carbon brick factory is located in the magnesium capital of China, and products with high bulk density and low porosity.
Magnesia carbon brick is a kind of important refractory used in steelmaking converter, steel making electric furnace, steel refining furnace and its ladle as lining (lining). As the erosion resistance, not easy to slag, so the use of magnesia brick can significantly improve the life of steel-making furnace (bag).
MgO-C bricks is the use of high-quality fused magnesia, high purity flake graphite, metal additives and other raw materials, phenolic resin as a binder by high-pressure molding, about 200 ℃ heat treatment made of a refractory products. High quality magnesium carbon brick to ensure the service life and safety, the use of poor quality magnesium carbon brick masonry furnace easy to burn, the occurrence of running steel, leakage of steel, casualties and other vicious accidents, so the procurement must be good Quality off.
The appearance of the black and white carbon brick products, the appearance of oil black shiny, cross-section neat; poor magnesia carbon brick product appearance rough white point, cross-section has a layer, resulting in particle segregation, and particles continue.
magnesite carbon bricks physical and chemical indicators with the naked eye is difficult to judge, the user can randomly send the authority to send the department for quality inspection. GB / T 22589-2008 "magnesium carbon brick" requirements of the physical and chemical indicators are as follows: MgO content, C content, significantly porosity, bulk density, room temperature compressive strength, high temperature bending strength.
Magnesium carbon brick is easy to hydrate, so the MGO brick manufacturers must be kept in the rain, moisture-proof warehouse. Packaging and transportation should also take measures to prevent rain and moisture, the product once the damp, product quality will decline, serious will lead to magnesium carbon brick products scrapped.

What are the processes for the preparation of magnesium carbon brick

magnesia carbon brick
Changxing Refractory is able to manufacture magnesia carbon brick for every ladle, EAF, and BOF. We will design you a well-balanced lining, providing optimal performance at the lowest possible cost. Our magnesia-carbon brick is made from more than 98% electrically fused magnesite, high purity graphite and metallic antioxidants as needed. Size and specification can be tailored according to furnace type.


Magnesium carbon brick is a high melting point of basic oxide oxide (melting point 2800 ℃) and difficult to be slag invasion of high melting point carbon material as raw material, add a variety of non-oxide additives. With carbonaceous binder combination of non-burning carbon composite refractory.

The traditional magnesia carbon brick produced by the synthetic tar binder in the cold mixing process is hardened during the process of tar damage and the necessary strength is obtained, thus forming isotropic glassy carbon. The carbon does not exhibit thermoplasticity, and the thermoplastic properties are eliminated in a large amount of stress during lining or during operation. The bituminous carbon brick produced by the asphalt binder has a high high temperature plasticity due to the formation of anisotropic graphitized coke during the asphalt carbonization process.

Therefore, the use of asphalt combined with the brick crack resistance is higher than the asphalt bonded brick. However, one of the disadvantages of bitumen-bonded bricks is the need for thermal mixing during the production and the provision of a brick mold preheating device. In this paper, the method of making MgO-C bricks  by cold mixing process is described. The resulting bricks have a lower modulus of elasticity so that they act to eliminate stress during operation. Ordinary coal tar pitch is harmful to environmental protection because of the presence of benzophen. The choice of benzene and low content of the special meet the environmental requirements of the binding agent.

In order to improve its oxidation resistance, can be added in the ingredients such as Si powder, Al powder, SiC powder or ferrosilicon powder additives, resin as a binder, high pressure molding, after 200 ~ 300 ℃ treatment can be used without Calcined. Mainly used for large-scale converter and ultra-high power furnace steel lining and furnace refining furnace lining and so on.

With the increase of carbon content, the bulk density and compressive strength of the magnesia-carbon brick are reduced. When the carbon content is between 6% and 8%, the high temperature flexural strength, thermal shock resistance, slag resistance and oxidation resistance of the magnesium carbon brick are good The carbon content is low and the slag resistance of the magnesia carbon bricks manufacturers is reduced. When the carbon content is 14%, the oxidation resistance of the magnesium carbon brick is the worst.

2017年5月10日星期三

Application and formulation of ladle castable

Ladle Castables

Ladle refractory castable is used for the ladle of a refractory castable by adding a certain amount of binder made of amorphous bulk refractory. Ladle is used in steel mills, foundries in the open furnace, electric furnace or converter to undertake molten steel before the casting operation. Ladle refractory castable to magnesia or high alumina spinel-based. Refractory aggregate for the pure magnesia or special bauxite clinker, refractory powder for the magnesium aluminum spinel powder; binding agent for the composite binder, while adding admixtures. This kind of refractory castable has good slag resistance, anti-peeling and thermal shock resistance, compared with the magnesium-aluminum spinel refractory castable, the performance is slightly inferior, the cost is significantly reduced, suitable for national conditions, easy to promote; and Ordinary aluminum and magnesium refractory castable materials , due to the addition of spinel, rather than in the course of the gradual formation of the use, so the performance significantly improved, the cost of the user can accept the extension of life, it is more promising.

Ladle refractory castable selection of high quality bauxite, corundum and high quality magnesia as the main material, the use of composite powder and add some additives from the preparation of a kind of unshaped refractory. Ladle refractory castable its main features are: explosion-proof performance, high temperature strength, resistance to erosion and erosion erosion ability. According to different conditions of use of the preparation of different types of ladle castable points: the general aluminum and Refractory company magnesium castable, slag and Baoshen composite aluminum magnesium castable, high-grade aluminum and magnesium castable, aluminum and magnesium spinel castables and other varieties.

With the requirements of the steelmaking plant production process, the development of continuous casting and furnace refining, so that the molten steel in the ladle residence time is relatively extended, thus accelerating the damage to the lining of the molten steel, resulting in ladle low life, So the need for high-grade high-strength refractory castable. Ladle refractory castable material to high-purity fused steel jade-based materials, the matrix mixed with high purity spinel, and add the right amount of binder, admixture (dispersant, water reducing agent) made. Has a good anti-slag and anti-striatability, high volume stability, strength, sintering time is short. Effectively improve the package age and service life, can be more than eight hundred traditional furnace increased to one hundred and thirty-four furnace.

Ladle refractory castable features:
1. Strong resistance to hot metal and slag erosion;
2. Good thermal shock resistance, small change in burn volume;
3. Strong antioxidant capacity;
4. Easy construction, quick baking without burst, easy to repair and dismantle;
5. When used, do not produce harmful gases, non-stick residue, long life.

we are ladle castable manufacturer in China. our ladle castable price is best. If you need please contact us via E-mail:sales8@chinaelong.com

What are the precautions for ladle castables when they are used and operated

Ladle Castables
Based on low-cement castable and superfine powder technologies, our company developed the series of castables for ladles to meet the operation conditions of various ladles. The castables are made by setting up scientific optimization of ingredients and accurate distributing of grain size as well as adding of high-quality binding agents and high-efficiency external reactants.
1, Refractory material construction with a forced mixer mixing, mixing may not be mixed with bags, rope and other debris, affecting the pouring effect and performance.

2, stir depending on the refractory castable site unpacking, mixing the amount according to the capacity of the mixer, castable should be accurately measured, into the mixer.

3, the first dry mixed with wet mixing process, the castable added to the mixer, dry mixing 2 minutes, add water about 5.2 to 5.5%, while stirring with water, first add 80% of the total, and then depending on the consistency of the situation as appropriate Add (and pay attention to the mixing water must be clean tap water, not sewage), wet mixing 4 minutes, one-time mixing shall not be less than 6 minutes until the insulating castable uniform, the surface of the slurry after the material, in general, When slightly dry, slightly thin wall (the above water for the reference value).

4, stirring to strictly control the amount of water and mixing time, to ensure the consistency required for construction. Castable materials  too thin will seriously affect the quality of material properties. Each time the amount of mixing, mixing time, add water uniform, If you find the mixing material consistency does not meet the requirements, should return to the mixer appropriate water or dry material mixing, is strictly prohibited in the pouring temporary use of water.

we are ladle castable exporter in China. our ladle castable price is best. If you need please contact us via E-mail:sales8@chinaelong.com

2017年5月9日星期二

Ladle Castable, ladle castables, Refractory Castable - Changxing Refractory

Ladle Castables

Ladle Castable, ladle castables, Refractory Castable - Changxing Refractory
Ladle Castable, ladle castables, Refractory Castable - Changxing Refractory
Introduction:
Based on low-cement castable and superfine powder technologies, our company developed the series of castables for ladles to meet the operation conditions of various ladles. The castables are made by setting up scientific optimization of ingredients and accurate distributing of grain size as well as adding of high-quality binding agents and high-efficiency external reactants.

Advantages:
1. Ladle castables show the features of high strength 2. Excellent thermal shock resistance 3. Corrosion resistance 4. High abrasion resistance and refractoriness 5. Stable volume

Application:
The products can be applied for ordinary ladles, refining ladles and ladles of EAF.

Contect source:
http://www.yilongrefractory.com/AllProductOneServlet?id1=2&id=24
E-mail:sales8@chinaelong.com

coil grout, red coil grout, induction furnace refractories, furnace coil grout - Changxing Refractories

Coil Grout

coil grout, red coil grout, induction furnace refractories, furnace coil grout - Changxing Refractories
Introduction and Advantages:
This coil grout is a grouting compound to coat coils in induction furnaces. Coil grout is required to be mixed with water and then applied by trowelling. Coil grout will provide a smooth surface to the slip plane medium, in order to allow uninhibited expansion and contraction of the working lining.

Application:
Coil grout is used as a grouting compound to coat coils in induction furnace.

Contect source:
http://www.yilongrefractory.com/AllProductOneServlet?id1=2&id=23
E-mail:sales8@chinaelong.com

Residual Heat Utilization of Refractory Gas Burning Kiln

Refractory With the gradual implementation of the national environmental protection policy, the original domestic coal-fired kiln in the...