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Magnesia dolomite For eaf

Magnesia-dolomite materials for EAF hearth

Use Bland
Sleeve of electrode: precast block LY-CFC-18RX
Work bricks:  MgO-C bricks LY-S-NSA-110XMA
Permanent bricks: magnesia bricks LY-HPT-B 
Stamping materials(dry setting):   magnesia-dolomite LY-S-MD-DV 
Eccentric bottom tap hole: Terminal block:Al2O3-SiC-C bricks  LY-ASG-X
Tapping tube: MgO-C bricks  LY-MG-15SX 
Electrode of furnace bottom: MgO-C bricks  LY-MG-16BSX 
Gunning repairing material:    magnesia-dolomite materials LY-G-HD100

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.
LY-S-MT –DV LY-S-MT-DV2 LY-S-MT-DV3 LY-S-MT -DP
Chemical Composition (%) MgO 93 95 94 93
SiO² 3 2 2 4
Grain composition (%) Maximum grain 5mm 5mm 5mm 5mm
1.2mm< 47 47 47 47
0.09mm> 23 24 23 21
balanced with both sinterability and corrosion resistance by using seawater magnesia clinker. corrosion resistant type by using fused magnesia clinker. sinterable type by using natural magnesia clinker. 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.
Brand LY-S-MD-DV56 LY-S-MD-DV65 LY-S-MD-DV30B LY-S-MD -DV
Chemical Composition (%) MgO 80 73 84 85
CaO 13 17 12 10
Fe₂O₃ 1 3
Grain composition (%) Maximum grain 10mm 10mm 10mm 10mm
1.2mm< 48 48 51 49
0.09mm> 17 17 21 22
CCS (MPa) 1500℃x3h 65 78 80 90
Added materials Magnesia
Dolomite
Iron bonded Magnesia × ×
basic type.  improved sinterability by increasing amount of dolomite. improved sinterability by adding iron bonded magnesia clinker. 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

Use Bland
Sleeve of electrode: precast block LY-CFC-18RX
Work bricks:  MgO-C bricks LY-S-NSA-110XMA
Permanent bricks: magnesia bricks LY-HPT-B 
Stamping materials(dry setting):     magnesia-dolomite LY-S-MD-DV 
Eccentric bottom tap hole: Terminal block:Al2O3-SiC-C bricks LY-ASG-X
Tapping tube: MgO-C bricks  LY-MG-15SX 
Electrode of furnace bottom: MgO-C bricks   LY-MG-16BSX 
Gunning repairing material:  magnesia-dolomite materials LY-G-HD100

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

LY-G-E1 LY-G-E3T LY-G-E7S LY-G-E8S
MgO 88 89 91 91
SiO2 3 3 3 3
CaO 2 2 2 2
Maximum grain 5mm 5mm 5mm 3mm
1.2mm< 40 40 45 35
0.09mm> 29 29 28 33
General type by natural magnesia   Fine part of material of sea water magnesia, and improved for corrosion resistance Material of sea water magnesia, further improvement for corrosion resistance Main material of sea water magnesia, and grain composition for good adhesion

Table 2 Magnesia dolomite type

LY-G-MD-EN LY-G-HD50 LY-G-HD100
Chemical composition(%) MgO 83 68 70
SiO2 4 4 3.5
CaO 7 22 23
Fe2O3 1 2.5 2.5
Grain composition(%) Maximum grain 5mm 5mm 5mm
1.2mm< 40 45 45
0.09mm> 27 28 28
Feature Based material of G-E1, additional of dolomite to get sinterability    Use of high calcium dolomite for improvement of sinterability, and material of natural magnesia  Base material of G-HD50, and use of sea water magnesia

Table 3 Magnesia spinel、Magnesia chrome

LY-G-E1SP LY-G-BSP8 LY-G-R2Y
Chemical composition(%) MgO 85 78 81
SiO2 3 3 5
CaO 2 2 2
Al2O3 6 15 -
Cr2O3 - - 5
Grain composition(%) Maximum grain 5mm 5mm 5mm
1.2mm< 40 43 40
0.09mm> 29 29 29
Feature Base material of G-E1, additional of spinel Main material of spinel Base material of G-E1, and additional of recycled magnesia chrome

LMM YOTAI PRODUCT

LMM TOTAI offer a complete product and service portfolio for all steelmaking processes.
From basic and non-basic bricks and mixes, slide gate plates, isostatic products and prefab components to special machinery, mechanisms and repair systems.

Our Clients Give The Best Feedback

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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LMM YOTAI established in 2007. Our production technology comes from Japanese Yotai. As an experienced and international player in the refractories industry. We have succeeded in expanding both the breadth of its product range and the depth of its services. From raw material selection, refractory portofio & optimization, installation & services & recycle of used refractories on site to further reduce client’s Opex & Capex in refractory consumption per ton steel output, meanwhile improve product quality of client.

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