• Raw Materials for Refractory:Magnesite BOF Gunning Material System 1
Raw Materials for Refractory:Magnesite BOF Gunning Material

Raw Materials for Refractory:Magnesite BOF Gunning Material

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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 .

Q: What are the fire protection standards of insulation materials?
According to the three versions of GB8624 (1997,2006,2011), the fire rating of external walls can be basically divided into: A1-, A2-, B1-, B2-, B3-level. The detailed divisions are determined by many technical indicators. It is a very professional and technical long story. Please contact QINGDAO SHANFANG INSTRUMENT CO., LTD for detail information, they are specialized in manufacturing fire rating testing instruments of external walls.
Q: What are the qualifications of refractory industry?
1 business license 2 tax registration certificate 3 organizing institution bar code 4 production permit
Q: Concrete composition and function of magnesia bond used in refractory
The main component of magnesia binder is silica powder and six partial, the mechanism is gel combination, and six can react with magnesium (basic refractory) to produce complex compound, and improve the strength of products
Q: What kind of refractories do the anode baking furnace use?
Usually the clay refractory bricks will be able to meet the requirements
Q: What are the requirements for the performance of refractory materials?
Performance requirements for electric furnace lining refractory: 1, sufficient refractoriness and softening point. Because of eletric arc, the inner surface temperature of lining can be as high as 1500 to 1800 degree. 2, strong resistance to slag. Because the dust penetrate into the furnace through pore lining, and the refractory material subject to loss, leading to spalling. 3, good thermal and shock resistance. Because during steelmaking, opening door and lifting of the furnace will lead to sudden changes in the temperature of the furnace lining refractory material, so spalling and cracking may occur, damaging the lining premature. 4, enough strength, because the lining is impact during charging, tilted when vibration,and eroded by metal, slag and airflow. 5, the thermal conductivity shall be small, and the conductivity shall be low. The commonly used furnace refractories are dolomite brick, magnesia brick, high alumina brick, silica brick and magnesia ramming etc.. Because of different working conditions of the various parts of the furnace, the refractory materials are not the same.
Q: Can anyone tell me which materials are fire-proof high temperature resistant material?
Fireproof high temperature resistant material is the synthetic material with fireproofing properties, or the material itself is high temperature resistant, heat-resistant, flame-retardant material. Fireproof materials are mainly used for construction with a variety of forms, which plays an absolute role in modern fire protection. The commonly used fireproof materials including fireproof panels, fire doors, fireproof glass, fire retardant coating and fireproof bag, etc.
Q: what's the detailed address of fireproof and thermal inuslation matertial market?
Detailed address of fire insulation materials market is as follows: A: Guangzhou Huatai building materials co., LTD. Address: Guangzhou Tianhe Chepo Road no. 10 B: Address of Donglong building materials market: Guangzhou Tianhe Taian North Road no. 7 C: Address of Huiya building materials trade market : Guangzhou Tianhe Sports West Road No. 109
Q: Is it normal for caable fire resistant material to catch on fire?
Abnormal, preventive measures: 1 take fire preventive measures. Measures taken for fire retardant measures of cable: (1) seal closely with fire resistant materials holes ran by cables through walls, shafts to prevent the cable fire, high temperature gas diffusion and spread when cables are on fire. (2) to wrap the cable with the insulation refractory material, when the cable is surrounded with fire, warpped cable is insulated by the insulation material from fire, so it will not be burned. If the cable itself is on fire, fire will be extinguished thankes to lack of oxygen in warpped cable, to avoid the fire to spread out. 2 to strengthen the cable circuit switch and regular protective check and maintenance, to ensure that the action is reliable. 3 to strengthen the cable operation and monitoring, to avoid the overload of the cable operation. . 4 regularly clean dust on the cable, to prevent cable from catching on fire due to the accumulation of dust. 5 to ensure the construction quality, the quality the cable must be strictly in line with the requirements and standards. 6 cable laying should maintain enough distance form the heat pipe, control cable is no longer than 0.5 meters; power cable is no longer than l meters. Control cable and power cable should be divided into slots, be layered and seperated instead of being overlapped . For the parts that do not meet the requirements, measures must be taken to insulate heat and fire. 7 regularly teat cable , abnormal problem should be handled in a timely manner. 8 install fire alarm so that fire will be discovered on time, and cables will not catch on fire. 9 the cable trench should be kept dry to prevent the cable from being affected with damp, or leading to declined insulating function and short circuit.

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