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{"title":"Superior Performance Magnesia Chrome Refractory for Cement Rotary Kiln Furnace","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/1d\/8e\/cf935ff4ef8720f35a61d7e27c88-200x200-1\/superior_performance_magnesia_chrome_refractory_for_cement_rotary_kiln_furnace_lining.jpg","attrs":{"Place of Origin":"Henan, China","Shape":"Brick","Material":"Magnesia Chrome","SiO2 Content (%)":"0.3-15%"}}
{"title":"12% CrO Content Magnesia Chrome Refractory Fire Bricks for High Temperature","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/ce\/cc\/ccf027ec866e75942977f2b52e0f-200x200-1\/12_25_cro_content_magnesia_chrome_refractory_fire_bricks_for_high_temperature_furnaces.jpg","attrs":{"Place of Origin":"Henan, China","Shape":"Brick","Material":"Magnesia Chrome","SiO2 Content (%)":"0.3-15%"}}
plywood cases for export, or other packages required by customer.
Port
Tianjin, Qingdao, Lianyungang, Shanghai, Ningbo
Supply Ability
3000 Ton/Tons per Month Magnesia carbon bricks
Place of Origin
Henan, China
Model Number
MT-12A,MT-12B,MT-12C
Brand Name
Hongtai
Product Description
Introduction of the performance and production process of refractory magnesia carbon brick
Magnesia carbon brick is a refractory material made of high-melting-point alkaline magnesium oxide (melting point 2800 ° C) and high melting point carbon material which is difficult to be infiltrated by slag,adding various non-oxide additives and combining carbonaceous binder. Magnesia carbon bricks are mainly used in converters, AC arc furnaces, linings of DC arc furnaces, slag lines of ladle, and the like.
Magnesia carbon brick Usually, the melting loss of magnesia carbon brick is carried out by reacting magnesia with slag on the working surface. The melting loss rate depends on the nature of the magnesia itself and on the size of the magnesia particles. Larger particles have higher corrosion resistance, but they are more likely to escape from the working face of the magnesia carbon brick to the slag. Once this happens, the rate of damage of the magnesia carbon brick will be accelerated. Magnesia carbon brick The absolute expansion of large particles of magnesia is larger than that of small particles. In addition, the expansion coefficient of magnesia is much larger than that of graphite. Therefore, in the MgO-C brick, the large particle/graphite interface of magnesia is produced at the interface of small particles/graphite of magnesia. The stress is large, and the crack generated is also large, which indicates that the critical grain size of the magnesia in the MgO-C brick is small, which has the effect of relieving thermal stress. Magnesia carbon brick From the aspect of product performance, the critical particle size becomes smaller, the open pores of the product decrease, and the pore diameter becomes smaller, which is beneficial to the improvement of the oxidation resistance of the product; at the same time, the internal friction between the materials is increased, the molding is difficult, and the density is lowered. Therefore, in the production of MgO-C bricks, it is very difficult to generalize the critical particle size of magnesia-silica. It is often necessary to determine the critical particle size of the magnesia based on the specific conditions of use of the MgO-C brick. In general, MgO-C bricks used in places with large temperature gradients and intense thermal shocks need to choose a smaller critical particle size; while those requiring high corrosion resistance, the critical grain size required is required.
1. Magnesia fine powder Magnesia carbon brick Magnesia carbon brick In order to maintain the overall uniformity of the thermal expansion of the particles and the matrix portion of the MgO-C brick, the matrix portion needs to be mixed with a certain amount of fine powder of magnesia, and also the structure maintains a certain integrity after partial oxidation of the matrix. However, if the fine powder of magnesia is too fine, the reduction rate of MgO will be accelerated, thereby accelerating the damage of the MgO-C brick. Magnesia sand less than 0.01mm is easy to react with graphite, so it is best not to mix such too fine magnesia when producing MgO-C bricks. In order to obtain MgO-C bricks with excellent performance, the ratio of magnesia to graphite of less than 0.074 mm in MgO-C bricks should be less than 0.5, and if it exceeds 1, the porosity of the matrix portion is sharply increased. 2, the amount of graphite added Magnesia carbon brick Magnesia carbon brick The amount of graphite added should be considered in combination with different bricks and different parts of the brick. In general, if the amount of graphite added is less than 10%, it is difficult to form a continuous carbon network in the product, and the carbon may not be effectively exhibited; the amount of graphite added is more than 20%, the molding is difficult during production, cracks are easily generated, and the product is easily oxidized. Therefore, the amount of graphite added is generally between 10% and 20%. According to different parts, different amounts of graphite are selected. The melting loss of MgO-C bricks is governed by the oxidation of graphite ink and the dissolution of MgO into the slag. Increasing the graphite can reduce the erosion rate of slag, but it increases the oxidation of gas phase and liquid phase. Damaged. 3, mixing Magnesia carbon brick Magnesia carbon brick The graphite is light in density and tends to float on top of the mix during mixing, making it incompletely in contact with other components in the furnish. High speed mixers or planetary mixers are generally used. When producing MgO-C bricks, if the feeding order is not paid attention to during the mixing, the plasticity and formability of the slurry will be affected, thereby affecting the yield and performance of the product. Magnesia carbon brick The correct order of addition is: magnesia (coarse, medium) → binder → graphite → magnesia powder and additives mixed powder. The mixing time varies slightly depending on the mixing equipment. If the mixing time is too long, the graphite and the fine powder around the magnesia are easily peeled off, and the mud is dried due to the large amount of solvent in the binder; if it is too short, the mixture is uneven and the plasticity is poor, which is not favorable for molding. 4, molding Magnesia carbon brick Magnesia carbon brick Molding is an important way to increase the packing density and densify the structure of the product. Therefore, high-pressure molding is required, and the pressing is strictly carried out according to the operating procedure of llight weight, heavy weight and multiple pressurization. When producing MgO-C bricks, the density of bricks is commonly used. Controlling the forming process, the higher the tonnage of the general press, the higher the density of the brick, and the less binder required for the mixture (otherwise, due to the shortening of the distance between the particles and the thinning of the liquid film, the bonding agent is partially localized, resulting in several The structure of the product is not uniform, which affects the performance of the product and also causes the elastic aftereffect to cause the brick to crack. 5, hardening treatment Magnesia carbon brick Magnesia carbon brick The phenolic resin-bonded MgO-C brick can be heat treated at a temperature of 200 to 250 ° C. The resin can be directly (thermosetting resin) or indirectly (thermoplastic resin) hardened to give the product a high strength, and the general processing time is 24 ~32h, of which 50~60°C needs to be kept warm due to resin softening; 100~110°C needs to be kept warm due to large amount of solvent evaporation; 200~250°C needs heat preservation due to condensation hardening of the bonding agent.
Specification
technical data:
Item
MT—12A
MT—12B
MT—12C
MT—14A
MT—14B
MT—14B
MgO
78
76
74
76
74
72
C
12
12
12
14
14
14
Apparent porosity %，≤
4
5
6
4
5
6
Bulk Density g/cm3
2.98
2.96
2.95
3
2.96
2.95
Crushing strength/Mpa，≥
40
40
35
40
40
35
Hot Modulus of(1450℃)/0.2MPa
8
7
6
12
10
8
Technical Data: There are 18 specifications from MT4 to MT 16 grades maganesia carbon bricks,please kindly Contact us for sending you all the datasheets.You can also send your specificaiton to us. As a professinal refractory bricks manufactuer, we can also produce other magnesia series refractory bricks, such as magnesia alumina carbon brick,magnesia alumina spinel brick,alumina magnesia bricks and etc. Except for those bricks,We can also produce sliding plate and sliding gate nozzle for steel ladle.
Scope of application: Magnesia carbon bricks are mainly used for the lining of converters, AC electric arc furnaces, and DC electric arc furnaces, and the slag line of ladle.
Advantage: 1.High tempreture resistance 2.Strong slag resistance 3.Good thermal shock resistance 4.Low creep under high tempreture
Packing & Delivery
Packaging of refractory bricks： 1.on wooden pallets with plastic cover: wooden pallet size :930*930 or 1000*1000mm, 2.Load weight of each pallet: 1.5-2.0 tons, 3.230*114*65mm:512PCS/Pallet, 230*114*75mm:448PCS/Pallet.
Shipping of refractory bricks： 1.Our packaging is as per customer’s request 2.Normal goods delivered by sea transport 3.Sample shipping by express 4.We will shipping and delivery goods timely, quanlity and quantity guaranteed, and also in accordance with the contract and customer's requirment completely.
Payment Terms
(1)T/T, Western Union,LC; (2)Usually 30% deposits,70% balance to be paid before delivery or against copy of BL or negotiations Others 1. MOQ: Usually 1 container, MOQ 1Tons, Customers can order certain PCS for special high chrome brick.
Why Choose Us
1. Strong professional: Our company has thirty years producing experience in refractory products. Our manager will supervise on a various refractorys production materials, process control, quality supervision and package delivery, and ensure the products are 100% qualified.
2.Annual supply: Our company has passed ISO9001 quality management system certification and SGS certification. And the annual supply of shaped and unshaped refractory product is 28, 800-35, 000 tons.
3. Export experiences: Now we have gained a global sales network reaching Taiwan, Russia, Vietnam, Pakistan, Bulgaria, French, India, Congo, Angola, South Africa, and so on. 4. Production equipment: Production and testing equipments are new, complete and automated or semi- automated. Such modern facilities and equipments have provided the fine technical guarantee for the production and testing.
5. Testing equipment: Our company's testing equipments as follows: High Temperature RUL Tester Bulk Density Tester The Pressure Tester Refractoriness Tester
Contact
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2012
Total Annual:
10000000-50000000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Henan Hongtai Kiln Refractory Co., Ltd. is established in 2012, located in Xinmi City, 40 kilometers southwest of Zhengzhou City in Henan Province, close to Jingguang, Longhai railway lines, with road transport facilities. Rich resources of Refractory materials, adequate and qualified fuel in this a... Henan Hongtai Kiln Refractory Co., Ltd. is established in 2012, located in Xinmi City, 40 kilometers southwest of Zhengzhou City in Henan Province, close to Jingguang, Longhai railway lines, with road transport facilities. Rich resources of Refractory materials, adequate and qualified fuel in this a...
