1. Equipment use
This reverberating furnace is used for melting and refining copper scraps, supplying the qualified raw material for manufacturing Φ8mm bright copper rod.
2. Technological process
Copper scraps→ melting in reverberating furnace, oxidation-reduction smelting process→ launder→ continuous casting and rolling line
3. Requirement for the red copper scraps
The red copper scraps as raw material should be put into the furnace according to the following proportions: 60% first-grade copper scraps+40% second-grade copper scraps.
-- Copper scrap on excellent grade (Pb<100, Sn<300, Ni<50, Zn<50, Fe<50 and Sb<20) should be clean and non-alloy copper wires free from tin, containing no fragile burned wires. copper content no less than 98%.
-- Copper scrap on grade 2 (Pb<1000, Sn<800, Ni<150, Zn<300, Fe< 500, Sb<100, S<200) should be small director copper wires without insulation, usually containing telephone wires, copper bus bar with varnish coating or paper insulation, and thick or thin, clean copper bar.copper content no less than 94%.
4. Technical data
4.1 Raw material: Red copper scraps
4.2 Type: Stationary rectangular reverberatory furnace
4.3 Heating fuel: Natural gas
4.4 No. of the burner: 3
4.5 Material of the burner: 45# medium carbon steel
4.6 Melting rate: 10T/h
4.7 Fuel consumption: 60-70 m³/ Ton copper
4.8 Temperature of hearth: 1,300~1,400℃
4.9 Temperature of liquid copper: ~1,200℃
4.10 Capacity: 60T
4.11 Hearth size: 6.7(L)*2.7(W) (as a reference, Subject to final design)
4.12 Molten pool depth: 600mm
4.13 Overall dimension of furnace: L* W * H=8.2(L)*4.2(W)*3(H). (as a reference, Subject to final design)
4.14 Total weight of furnace: Appro. 260T (the heat resistant brick about 230T)
4.15 Total power: ~120KW
4.16 Power supply: 415V+/-5%, 50HZ, 3-PHASE, 4-WIRE.
5. Main composition
This reverberating furnace is made up by the below components:
Refractory material
Furnace door and driving mechanism
Burning system
Air delivery system
Flue system (Buyer self-provided)
Electrical control system
5.1 Steel structure
In order to make the panels do not deform at high temperatures, the steel structure of the furnace is assembled by a 25mm thick panels, round steel, etc. There are reinforcement ribs in column rebar, columns combination with I-Beam steel.
5.2 Furnace door and slag notch
Furnace with double door structure, water-cooled door, there is a fixed outer inclined water jacket furnace door. Movable water jacket door is attached to the door frame by its weight. When using, the movable door is along the inclined outer side sliding up and down, good sealing performance, no flaming phenomenon between the door and the oven door frames, door lifting mechanism adopts lifting hoist.
Furnace slag notch open in the end, the size of 360 × 360mm, the slag door by lifting weights.
5.3 Refractory material
5.3.1 Furnace bottom
First spread a layer of asbestos board in cast iron plate, six layers of refractory bricks, and then tie the refractory filler layer anti-arched masonry, forming 380mm of magnesia bricks on the filler layer thickness.
5.3.2 Furnace wall
Usually chrome magnesia brick masonry. Between the furnace walls and hoardings, leaving a gap of 50mm, full of filler.
5.3.3 Furnace top
Due to large temperature changes, build by chrome magnesite brick resistant to thermal shock. In order to maintain the thermal stability of the roof, the entire roof is usually composed of two-stage or three-stage, during which remain appropriate expansion joints, roof tile thickness is 380mm.
5.3.4 Outlet copper mouth
Located on the stove side wall, holes type, split outer and inner layers, the inner layer is a 120 × 120mm square hole, the length of 450mm, an outer diameter of 25mm hole, length of 150mm, has two brick side by side brick, this hole center higher than the bottom 75mm, after the completion of copper, bottom always leave a small amount of copper liquid, to avoid the scum bonded copper bottom and the mouth.
5.3.5 Flue system
Flue system generally built inner layer by magnesium aluminum brick, outer structure
5.5 Air delivery system
The reverberating furnace requires two air, one of the fuel used in the combustion, is low-pressure air, which is provided by the low-pressure blower; the second is the oxidation operation compressed air (1.3MPa), provided by the air compressor ( purchased by the demand side) .
5.6 Charging device
It adopts the Leveraged artificial feeding mechanism.
5.7 Electrical control system
Electrical control system of burning system and water cooling system are all placed in one electrical operating cabinet, which beneficial to the operation.
For details, see the circuit diagram.
6. Supply list
6.1. The whole set of steel structure
6.2 The whole set of furnace door
6.3 The whole set of refractory material
6.4 Material for Launder and intermediate fort
6.5 The whole set of burning system
6.6 The whole set of air delivery system (not including air compressor)
6.7 The whole set of electrical control system.
