Steel structure
Furnace brick body
Furnace door and transmission mechanism: 2 sets, 1 slagging door
Natural gas burner: 3 No.
1.1 Steel structure:
In order for the furnace not to deform under high temperature, 24 pieces of H steel 28# are used as steel structure for the furnace, which are joined withφ45# 50mm steel bar and lined up with 40mm thick cast iron plate on the bottom and around. In the vertical column around the furnace door and close to the burner, water is filled for cooling in order to prevent deformation under high temperature.
1.2 Furnace door and slagging door
The charging mouth is of 20# furnace door structure, which is water-cooled. Its inner layer is in a dimension of 1100×680×240mm, of fixed water-jacket door frame with inclined outer side. The moveable water jacket is attached to the door frame under its own weight. In operation, the door slides up and down on its inclined outer side and its sealing is perfectly good. The door is lifted by hoister. While the slagging door is set at the furnace tail, in a size of 550×530mm, so it is small but is lifted by heavy hammer.
1.3 Brick body
1.3.1 Bottom:
Piers are first of all made on the foundation, followed by cast iron plates, which are then lined with a layer of asbestos sheets, then five layers of refractory bricks, then with refractory filler, which form into an inverted arch. After drying up, vertical shaped magnesium bricks 380 are laid on top;
1.3.2 Wall:
Chromium-magnesium bricks are used, with the back wall in 450mm thickness and the front wall in 600mm thickness. To get more temperature holding effect of the entire furnace, clay bricks in 113mm thickness are laid between the wall and the encircling plates, and refractory filler in 50mm thickness is filled in the gap between;
1.3.3 Top
As temperature varies a lot on the top of the furnace, chromium-magnesium bricks, which have better thermal stability, are used to lay the two sections or three section, with an expansion seam of 10mm in between, and for each ring, an expansion seam is properly reserved. Thickness of the brick on top of the furnace is 380mm;
1.3.4 Spout
It is set in the back wall of the furnace, of eyelet type in inner and outer layers, of which the inner layer is of a square hole in 75x75mm size and 150mm length, while the outer layer is of a round hole in 25mm diameter in 200mm length, laid with three layers of bricks. The center of the round hole is 75mm higher than the furnace bottom. After copper melt flows out, a little amount of copper melt remains over the bottom so as to prevent scum from bonding with the bottom and the spout;
1.3.5 Flue
There is a rising flue at the tail of the furnace, which goes to horizontal flue, lower flue, and underpass flue to the chimney, in a length of 30~40m. The underpass flue is laid with single brick and the rest of flue is laid with one and a half brick, with chromium-magnesium brick as the inner layer and clay as the outer layer.
1.4 Gas Burner
It’s of mixed swirling type. It’s simple in construction, easy to ignite, and stable in burning, good for long-term operation.
1.5 Air Blower
There are two types of air blowers, one is of lower pressure blower for burning fuel, at an air capacity of 10,000M3/h, pressure of 1,000mmH2O, and power at 45kw. The other one is compressed air for oxidation operation, at a capacity of 12M3/min and pressure of 4kg/mm.
1.6 Charger
By manual charging with the help of lever. See attached drawing.
2. Main Technical Parameters
2.1 Application: melting and refining the red copper scraps
2.2 Type: stationary
2.3 Rated capacity:50t
2.4 Type of fuel: natural gas
2.5 Heating mode: heating by flame spurt from the burner to the furnace material by means of convective impact;
2.6 Melting capacity: 1,200°C
3.7. Temperature of metal
3.8 Casting speed: 15~18t/h.
3.9 Maximum temperature inside furnace: 1400°C.
3.10 Size of furnace chamber: 8590×4230×2200
3.11 Temperature control: by adjusting the size of flame
3.12 Consumption of natural gas: 90~110M3 /t
