Rotary Furnace with Air-Pollution Control Device:-
About Rotary Furnace
The Rotary Melting Furnace is a very flexible and universal equipment used for recycling many non-ferrous metals.A lead production system based on this technology has certain distinct characteristics such as:
Description of Rotary Furnace
It is a Rotary kiln in the form of a metallic cylinder with conical sides on both ends. Mild steel plate is used for construction of this shell and its thickness varies depending upon the capacity of the equipment. This shell is rotated on its own axis at 1-2 rpm.These are fabricated from MS squares or flats, machined for a smooth finish.These rollers are fitted on a robust MS structural frame and driven by a gear & motor arrangement.
Conical ends of the furnace are open on both sides. The furnace is charged with Raw material along with additives from the front end. This side is provided with a movable door on which a burner is mounted.At the other end, an exhaust block lined with refractory bricks is provided. Flue gases generated are sucked from the exhaust block side of the furnace.
Process Details of a typical 3.0 TpB Rotary Furnace
Raw Material Charged |
3000 kgs/ Batch |
Total additive chemicals charged |
400-500 kgs/ Batch |
Rotational speed |
1-2 RPM |
Fuel used |
Furnace Oil |
Calorific value of fuel used |
8600 kCal/ kg. |
Fuel consumed |
30-40 lt/ hr. |
Air provided for process |
1250 cmh |
Lead produced |
9000-10000 kg/day (for Raw Material feed of 12-15 TpD; |
Flue gas generation |
15000 cmh |
Section View of Rotary Furnace
Advantages and Disadvantages of Rotary Furnace
Advantages
Disadvantages
Characteristics of Air Pollution generated in Rotary Furnace
Dust |
8000-15000 mg/Nm3 |
Temperature |
100-120o C |
Gases |
Traces of NOx and SO2 |
Discharge Characteristics required as per Norms
Dust |
Less than 50 mg / Nm3 |
Lead (Pb) |
Less than 10 mg / Nm3 |