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:
Equipment scalable for installing higher capacities
Recovers all lead in one production cycle
Plates & powder from scrap battery as well as slag from Mini Blast Furnace can be used as raw material
Requires addition of certain consumables
Generates high Pollution both as Flue Gases & Fugitive Emissions
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
Calorific value of fuel used
8600 kCal/ kg.
30-40 lt/ hr.
Air provided for process
9000-10000 kg/day (for Raw Material feed of 12-15 TpD;
Flue gas generation
Section View of Rotary Furnace
Advantages and Disadvantages of Rotary Furnace
- Recovers 100% lead in the first operation.
- Slag produced is lead free.
- Equipment can be scaled up for higher production capacities.
- Many chemicals are required for operation.
- High power consumption.
- Fugitive Emissions need to be captured in addition to flue gases.
- Need skilled operators and careful maintenance.
Characteristics of Air Pollution generated in Rotary Furnace
Traces of NOx and SO2
Discharge Characteristics required as per Norms
Less than 50 mg / Nm3
Less than 10 mg / Nm3