Magnesite Bof Gunning Material

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Product Description:

Magnesite unshaped products  

   Gunning material for tundish

specification

Chemical composition( % )

MgO

CaO

SiO2

≥ 80

≤ 2

≤ 8

Size  (mm)

0-3

Bulk density (g/cm3)
110
℃× 24h

≤ 2.5

Cold crushing strength (MPa)
110
℃× 24h
1550 ℃× 2h

≥ 8

Linear change after burning (%)
1550
℃× 2h

-3

   Gunning mix

Type

Chemical composition( % )

MgO

CaO

C

SiO2

Patching mix for tapping hole

85

6

8

3

Stuffing material for tapping hole

36

≥ 5

30

   Gunning mix for electric furnace

Chemical composition( % )

SiO2

MgO

5.50

83

   Ferroalloy ramming mass

Chemical composition(%)

MgO

CaO

Fe2O3

Al2O3

SiO2

IL

85

6-8

4-6

0.5

1.2

0.5

   Gunning mix for converter

Chemical composition( % )

MgO

82

SiO2

5.5

large area patching mix for converter

Specification  

Chemical composition (%)

MgO

SiO2

C

≥ 73

≤ 2

≥ 8

Size ( mm )

0-10

Bulk density(g/cm3)800 ℃

≥ 2.3

Compression strength( MPa )after heat treatment800 ℃

≥ 10

Production Technics:

1.Based on high pure magnesia, as the main raw material;

2.adding various compound anchoring agent, ;

3.By mixing and refining.

Production Features:

1.High refractoriness ,excellent resistance for spall , high tap density

2.Easy to spry and sinter, Adhesive rate reach 94% , low rebounding ;

3.Long service life ,once can last 10-24 hours ;

4.Minimum pollutants

Construction method :

1.using quantity:for 30 tons converter, one ton /time

2.Using method : to fill  Gunning Mass into the spraying tank (compressed air without water under 2.2-0.4pa ); and then spray to the part need to be repair .

3.After spraying , there will be 20 minutes for sintering ;

4.Note: if somewhere occur weak situation,must stick the brick firstly ,and then spray again .

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Q:Which schools are the best schools in the world for learning knowledge about refractories?
If you search on a worldwide scale, I might say you are ambitious!!! This major becomes an unpopular one and you must have to embark on graduate and PhD to specialize in it provided that you want to go abroad for further study. Wuhan University of Science and Technology may be the best school in this field with its close relatinship with many refractory manufacture factories across the country. Henan University of Science and Technology is also advisable in terms of this major, which probably promise you a job. Other universities in this regard are not quite familiar to me. You raised these questions, which shows that you are a layman to this major or not quite familiar with this major. If you have any questions, you can resort to me if I can.
Q:What kinds of refractory will be used in kiln of sintering ceramics?
Porcelain has many classes, including acid, alkaline and neutral materials.
Q:I want to consult the fire resistant level standards of external wall thermal insulation materials.
1, The building with the height larger than or equal to 100m, should have the A-level combustion performance. 2, The thermal insulation material of the building, with a height larger than or equal 60m and less than 100m, should not be less than the level B2 combustion performance. When using the level B2 insulation material, each level should set horizonal fire barrier zone. 3, The thermal insulation material of the building, with a height larger than or equal to 24m and less than 100m, should not be less than the level B2 combustion performance. When using the level B2 insulation material, each two levels should set horizonal fire barrier zone. 4, The thermal insulation material of the building, with a height less than 24m, should not be less than the level B2 combustion performance. When using the level B2 insulation material, each three levels should set horizonal fire barrier zone. I hope my answer will help you. Thank you!
Q:Using what kind of melting aluminium furnace refractories is more appropriate?
If it's the ordinary, you can use high aluminum refractory brick with general clay, GB/T 3994-2005 clay heat insulation refractory brick. If you need these with good material, there is high alumina thermal insulation refractory brick, GB/T 3995-2006 high aluminum heat insulation refractory brick, models have A13 and material is the alumina, A13 50 u, high insulating brick B5.Intermediate insulating brick B2, etc. Dolomite brick: good hang kiln performance, good erosion resistance, but brick is usually without f - CaO, hydration, and difficult to transport and storage, less used in the production. Magnesia-chrome bricks: good hang kiln, used in calcining zone. The disadvantage is that its thermal shock resistance is poor and plus hexavalent Cr is toxic, the production and use of magnesite chrome bricks in international countries gradually reduce. Now unit using the brick find replacements as soon as possible.
Q:what is the Specifications Grading for Fireproof rubber insulation materials ?
At present, China Building Materials has two grading criteria for combustion performance. "Combustion Performance Classification Method of Building Materials" and "Combustion Performance Classification Method of Building Materials and Products" (GB8624-2006). Among them, one of the major changes of GB8624-2006 and GB8624-1997 is to divide the material combustion performance grading from homogenous material)Class A (composite sandwich material), B1, B2 and B3 level five minutes as A1, A2, B, C, D, E, F seven levels.
Q:How long does it take for refractory cement to solidify?
1. First you should be aware of the concepts of condensation and condesation time. Refractory cement belongs unshaped refractories, which when added water or liquid binding agent to mix, the agitation material will gradually lose thixotropy or plasticity and become in a state of solidification, thus is solidified. The time needed to finish the process is called solidification time. The whole process is divided into initial and final set. When beginning to lose plasticity called the initial setting, when called plasticity completely lost the final setting. 2. For refractory cement, the solidification time depends on the matching of the material and the parts and using methods. Under normal circumstances, in order to meet the requirements of time of construction, the initial set time should be no shorter than 40min, and the final set time should be no longer than 8H 3. There are also some exceptions. When refractory cement is used for spraying and injection operation together with other refractory castable, the set time is required as short as possible, sometimes flash set is required to prevent the occurrence of peeling or collapse of the spraying layer.
Q:What is high alumina refractory?
It refers to inorganic non-metallic material with refractoriness of higher than 1580℃. Refractoriness refers to the celsius temperature that the cone-shaped refractory sample without load can resist, and under which the sample won't soften and melt down. Refractory material appears together with high temperature technology, and roughly dates from the Middle Bronze age. In the Eastern Han Dynasty (AD25~AD220) of China, fireclay refractories has been used as furnace refractories and saggers for making porcelains. In the early 20th century, refractory material develops toward the direction of high purity, high dense and ultra high temperature products, and meanwhile unshaped refractory and refractory fiber with no need of firing at all and with low energy consumption appear.
Q:Who knows about the fire endurance of grade C fire doors?
The fire endurance of grade C fire doors is no less than 0.5 hours. As the key role of family fireproofing, fire doors is particularly important. It can be classified according to the fire endurance and thermal insulation performance: The fire endurance of grade A fire doors is not less than 1.5 hours; that of grade B fire doors is not less than 1.0 hours; and that of grade C fire doors is not less than 0.5 hours. We can choose in accordance with different needs, but commonly used fire doors are grade A and B fire doors now.
Q:Who knows about the types of Dalian thermal insulating and refractory materials?
There are many Dalian thermal insulation materials, which can be divided into organic and inorganic thermal insulation materials. Materials include inorganic thermal insulation materials, polyfoam, mineral wool products, foam glass, expanded perlite insulation products, gelatine powder EPS grain heat insulating slurry, sprayed mineral wool, thermal insulation product of foam cements, and vacuum thermal insulation board.
Q:Which one is the best refractory material?
Resin bonded refractory is mainly abot aluminum magnesium carbon, and carbonaceous etc. Thermoplastic resins need to add the coagulant (Uto), ageing mixture for a period of time, so the production cycle is long. Hot hard resin is relatively not so complex, but it’s not as good as thermoplastic resins in thermoplastic binding.

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