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UKRAINIAN CUSTOMERS
UKRAINIAN CUSTOMERS
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The MgO-C bricks which used in EAF has a good performance in 75 furnaces, we are so satificated with the using performance of the bricks from LMM YOTAI
	 EGYPT A CUSTOMERS
EGYPT A CUSTOMERS
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We improved the bricks formula and specification accoridng to our experience, the final using performance doubled compared with their previous specification.
	 EGYPT B CUSTOMERS
EGYPT B CUSTOMERS
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In the ladle we have been using high alumina bricks with a performance of 50 heats. After the improved design of LMM YOTAI engineers, we use magnesia carbon bricks instead of high alumina bricks, and the performance reaches 60 furnaces and is still running.
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Magnesia-dolomite materials for EAF hearth


Brand: LMM YOTAI
Warranty: 1 year
Sample: Sample testing is available
Certification: ISO9001/ISO14001
Payment method: TT/LC
Shipping method: sea/land/air
Specifications: Customized products according to customer drawings

Magnesia-dolomite materials for EAF hearth

Refractories for EAF hearth

Wet type of stamping material, which magnesia is mixed with bittern solution and molded by rammer, is generally used for lining material for hearth of electric arc furnace. However, in case of severe operation conditions on hearth of DC furnace or any, dry type of magnesia-dolomite stamping material which emphasizes sinterability is mainly chosen. YOTAI supplies kinds of materials introduced below.

Wet Type Stamping Material

  • Superior in slag corrosion  resistance.
  • Grades are divided by magnesia raw material.
  • Mix after adding bittern solution or Magnesium  Chloride powder with water
  • Constructed by rammer or vibrating stamping machine.
 S-MT –DVS-MT-DV2S-MT-DV3S-MT -DP
Chemical Composition (%)
MgO93959493
SiO²3224
Grain composition (%)
Maximum grain5mm5mm5mm5mm
1.2mm<47474747
0.09mm>23242321

S-MT –DV:balanced with both sinterability and corrosion resistance by using seawater magnesia clinker.

S-MT-DV2:corrosion resistant type by using fused magnesia clinker.

S-MT-DV3:sinterable type by using natural magnesia clinker.

S-MT -DP:adjusted grain sizes for rammer by using seawater magnesia clinker.

 

Dry Type Stamping Material

  • Superior to sinterability. Dense and high intensity construction can be offered.
  • Grades are divided by amount of dolomite material.
  • Constructed by vibration fabrication in dry condition.
 S-MD-DV56S-MD-DV65S-MD-DV30BS-MD -DV
Chemical Composition (%)
MgO80738485
CaO13171210
Fe₂O₃  13
Maximum grain10mm10mm10mm10mm
1.2mm<48485149
0.09mm>17172122
CCS (MPa)1500℃x3h65788090
Added materials
Magnesia
Dolomite
Iron bonded Magnesia××

 

S-MD-DV56:basic type. 

S-MD-DV65:improved sinterability by increasing amount of dolomite.

S-MD-DV30B:improved sinterability by adding iron bonded magnesia clinker.

S-MD -DV:improved sinterability the most. Suitable in front of work door of DC furnace and around electrode circumference of DC furnace bottom.

Magnesia-dolomite materials for EAF repairing

Refractories for EAF repairing

These materials are applied for hot gunning for electronic furnace repair, and used of basic gunning material in general. Yotai consider for various kind of materials and develop the materials to get the satisfaction by user, and the introduction is mentioned as below.

 Features:
  • We have general type using virgin materials, and cost cut type using recycled materials.

  • Our general type has Magnesia G-E series for corrosion resistance, Magnesia dolomite G-MD/HD series for Sinterability to wall of furnace and Magnesia spinel type of G-E1SP/BSP8 for suitable to operation in low C/S slag line.

  • Our cost down type has Magnesia Chrome G-R2Y, that is made by recycled material. The recycled material after using at the furnace is provided by steel manufacturer, and is done for sizing and grading.
 Gunning repairing material

Chemical composition, grain composition and features

Table 1  Magnesia type

 G-E1G-E3TG-E7SG-E8S
Chemical composition(%)    
MgO88899191
SiO23333
CaO2222
Grain composition(%)    
Maximum grain5mm5mm5mm3mm
1.2mm<40404535
0.09mm>29292833

G-E1 General type by natural magnesia 

G-E3T Fine part of material of sea water magnesia, and improved for corrosion resistance

G-E7S Material of sea water magnesia, further improvement for corrosion resistance

G-E8S Main material of sea water magnesia, and grain composition for good adhesion

Table 2 Magnesia dolomite type

 G-MD-ENG-HD50G-HD100
Chemical composition(%)   
MgO836870
SiO2443.5
CaO72223
Fe2O312.52.5
Grain composition(%)   
Maximum grain5mm5mm5mm
1.2mm<404545
0.09mm>272828

G-MD-EN Based material of G-E1, additional of dolomite to get sinterability

G-HD50 Use of high calcium dolomite for improvement of sinterability, and material of natural magnesia 

G-HD100 Base material of G-HD50, and use of sea water magnesia

Table 3 Magnesia spinel、Magnesia chrome

 G-E1SPG-BSP8G-R2Y
Chemical composition(%)   
MgO857881
SiO2335
CaO222
Al2O3615
Cr2O35
Grain composition(%)   
Maximum grain5mm5mm5mm
1.2mm<404340
0.09mm>292929

G-E1SP Base material of G-E1, additional of spinel

G-BSP8 Main material of spinel 

G-R2Y Base material of G-E1, and additional of recycled magnesia chrome

Comprehensive solution of Refractory for steelmaking

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