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:How to divide the materials according to the National Fireproofing Material Standard?
according to China's national standard GB8624-97, the combustion performance of construction materials can be divided into several classes: Class A: Incombustible building material: Almost no burning material. Class B1: nonflammable building material: nonflammable material has a good flame resistance effect. when it meet the open fire in the air or burnd at high temperature, it is difficult to spread quickly, and when the fire source is removed, the combustion stop immediately. Class B2: flammable building material: flammable material has a good flame resistance effect. when it meets open fire in the air or at high temperature, it will immediately burst into flames and easily cause fire spread, such as wooden column, timber roof truss, timber beam, and wooden stairs,ect.. Class B3: inflammable building material: No flame resisting effects, highly flammable, high fire risk.
Q:What are the construction measures of refractory material in winter? Please descriptive briefly.
The temperature is low in winter, so refractory bulk materials should be stirred evenly on time to avoid freezing.
Q:What is the fire resistance thickness of the thin fire-retardant coatings?
Our thin steelwork fireproof coatings: the fire resistance is 2.5 hours, the thickness is 4.9 mm, the fire resistance is 2.0 hours, the thickness is 3.5 mm, the fire resistance is 1.5 hours, the thickness is 1.75 mm, the fire resistance is 1.0 hours, the thickness is 1.17 mm.
Q:Who can introduce the external wall thermal insulation materials fire rating regulations?
According to public fire-fighting [2007] No. 182, the contents of the notification on the implementation of a number of issues of national standards GB8624-2006 "building materials and products combustion performance classification", since there is large differences between the new version of the standard GB8624-2006 and the old version of GB8624-1997 in the principle, hierarchical structure and test methods. According to the cintent of notification, in order to ensure a smooth transition between the old and new standards, the current national standard "Fireproof  Specification of Building Interior Decoration Design" GB50222, "fire safety rules of tall civil buildings design" GB50045, "Fireproof  Specification of Building Design" GB50016 have not completed the relevant amendments, the new classification method of GB8624-1997 and GB8624-2006 can be used for temporary reference in terms of combustion performance of materials . From GB8624-2006 standard implementation, the classification of combustion performance is too granular, which do not match to the actual construction of the current project in our country. Therefore, the relevant departments carry on the 3rd amendment for the GB8624-2006 standards, namely GB8624-2012, and it will be released on December 31, 2012 and implemented on October 1, 2013. The combustion grading requirements in the standard: Level A is non-combustible materials (products); level B1 is nonflammable material (products); level B2 is combustible materials (products); level B3 is flammable materials (products).
Q:Who knows about the grade C fireproof door materials?
I am happy to answer your questions. Wood or steel materials are usually used. The new national standard fire doors: According to the enacted GB12955-2008, the fire endurance of grade C fire doors is 0.5 hours and that of grade A and B are 1.5 hours and 1.0 hours respectively. I hope my answer can help you.
Q:What are the chemical composition of refractory cement?
Calcium aluminate prepared by calcining as the main component. Aluminate cement takes bauxite and limestone as raw materials, alumina content of about 50% as the clinker. And it is a hydraulic cementing material made by grinding. Refractory cement is also known as aluminate cement.
Q:How do refractory materials apply into pyrophyllite?
When it is sized, add some clinker and after calcination, aggregate will be finished. From: turn to help
Q:What is the difference between wear-resistant material and refractory material?
Focus is different. Some materials are called wear-resistant and refractory material. For example, refractory castable with high strength and wear-resistance, impressionable plastic material or brick. They all begin with fire-resistance and wear-resistance.
Q:What is the requirement of refractory concrete for raw materials? What is the main principle of commercial mixing station?
There are many kinds of raw materials used, three, two aluminum oxide is one of the most commonly used raw materials, as well as alumina, hollow ball, Magnesium Oxide, zircon, etc., or the specific design temperature and the use of parts.
Q:How is grade of fire endurance divided?
You can search the answer on the Internet, thank you!

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