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Copper Melting and Holding

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Two types of lining materials for copper melting: 

SIL-RAM ® 120CU is a fused silica-based acid lining material with excellent volume stability and resistance to molten copper penetration.It is recommended as the lining material to large coreless induction furnace for melting brass and propeller bronze;

ALU-RAM ® CU series are alumina-based materials with silicon carbide, fused silica or magnesium oxide added.

The addition of silicon carbide improves the material's resistance to slag and corrosion.

The addition of magnesium oxide improves the density and erosion resistance;

This series include ALU-RAM ® 122CU, ALU-RAM ® 125CU, ALU-RAM ® 130CU, ALU-RAM ® 135CU etc.

Main points of demolding during sintering process:

  1. For large furnaces, use smeltable molds as the first choice. The lining needs to be sintered to the specified temperature before pulling out the mold, and a long-time heat preservation is necessary. If the process control is not strict, the lining will be damaged easily;
  2. The penetration of copper is strong, so the density of the lining during installing must be ensured, and the paper or tape for wrapping the mold is easily be broken during the installation process, so avoid the scraps falling into the lining;
  3. the large furnace must use the split mold, and use gas for sintering as much as possible, if use the electric power for sintering, the joint of the mold is easy to have arc discharge, that will damage the mold, and it is not conducive to demolding later;
  4. It is also a key link of the charging and melting process after demolding. The surface strength of the lining after the first stage sintering is not very high. If the charging material is too large, the lining is easily damaged, especially in the upper part when the material is sinking, the worst result is to reject the lining.
 
耐热材料
 
No. Location Product Name
Product 
Description
Al₂O₃
%
SiO₂
%
Cr₂O₃
%
CaO
%
B.D.
g/cm³
Max.
Temp.℃
1 Cover ULTRA-CAST 200 Aluminum silicon based castable 45.0 50.0   2.0 2.30 1650
2 Spout ALU-PAK® 55 Aluminum silicon based plastic 61.0 32.0     2.55 1680
ALU-PAK® 67 Aluminum silicon based plastic 68.0 26.0     2.65 1700
3 Upper Ring ULTRA-FLO 85 Alumina Based Castable 84.0 12.0   2.0 2.85 1800
ULTRA-FLO 61 Mullite Based Castable 63.0 30.0   1.5 2.50 1700
4 GROUT COIL CRETE 390 White Alumina Based Grout 85.0 6.0   5.0 2.60 1760
COIL CRETE 590 Red Alumina Based Grout 91.0 2.0   5.0 2.80 1760
5
Patching 
material
ALU-SEAL 68 Aluminum silicon based plastic 68.0 26.0     2.65 1650
ALU-PAK® 73CR Alumina chromium-containing
plastic material
75.0 9.0 4.0   2.85 1750
6 Work lining SIL-RAM 120CU Fused silica-based dry vibrating material   98.7     1.98 1450
ALU-RAM 135CU Corundum based dry vibrating material 90.0 3.0   4(SIC) 3.10 1450
ALU-RAM 122CU Alumina based dry vibrating material 80.0 13.0   4(SIC) 2.60 1400
ALU-RAM 125CU Alumina based dry vibrating material 80.0 13.0   4(SIC) 2.60 1450
ALU-RAM 130CU Corundum spinel based
dry vibrating material
86.0 0.5 10.0   3.20 1650
7 push out blocks ULTRA-FLO 85 Alumina based low cement castable 84.00 12.00   2.0 2.85 1800
8 slip plane SFR-MICA 0.3mm thickness Mica Paper           900

 


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