The Latest Development of Oxygen Bottom Blowing …
329
Technological Process
Pretreatment of Waste Lead Acid Battery
The waste lead acid battery is caught into the hopper by multi-lobe grab crane, which
is uniformly added to the belt conveyor through the vibrating feeder and transported
to the crusher for crushing. The crushed accumulator is continuously sent to the
hydraulic grading box by the screw conveyor. The heavy parts with large density
(i.e. metal particles) sink to the bottom of the grading box, which are taken away by
the screw conveyor. And the qualified metal particles after washing are sent to the
lead-based alloy production system by the belt conveyor. The light parts with low
density are sent to the horizontal sieve with the water flow. The material under the
screen is the oxide with small particle size (lead paste), which is sent to the filter press
by pump. The filter cake is sent to the melting system for processing, and the filtrate
is sent to the circulation tank for recycling. The organic matter on the screen flows
into another hydraulic grading box for grading. The plastic parts with low density
and the rubber parts with high density are separated and unloaded, respectively, by
the corresponding screw machine. The plastic and rubber parts are sent to the waste
plastic modified granulation comprehensive utilization system.
Using the natural gas as fuel, the lead alloy is smelted by the regenerative melting
pot. After added appropriate amount of antimony powder, the lead antimony alloy is
produced for sale.
Bullion Smelting
SKS Smelting
After proportion, the lead concentrate, lead paste, sulfur gold ore, and lead silver
residue sent to the mixing granulation workshop, which are mixed with the weighed
returning dust to be granulated. After granulation, the mixed lead bearing materials
are sent to the front furnace bin of smelting workshop by belt conveyor, which are
added into the SKS furnace by belt conveyor after measuring by the constant feeder.
Oxygen is sprayed into the furnace from the bottom. The rich slag, primary bullion,
dust and offgas are produced. The molten SKS slag flows directly into the RSKS
furnace through the launder for reduction smelting. The primary bullion is fed into
the molten lead pot through the tundish and chute for copper removal. The dust is
returned to the smelting system for through the scraper conveyor. After recovering
waste heat from waste heat boiler and collecting dust from electric dust collector, the
offgas is delivered to the sulfuric acid delivery plant to produce acid by the double
contact sulphuric acid process. And the tail gas after acid making is sent to the offgas
desulfurization system.
329
Technological Process
Pretreatment of Waste Lead Acid Battery
The waste lead acid battery is caught into the hopper by multi-lobe grab crane, which
is uniformly added to the belt conveyor through the vibrating feeder and transported
to the crusher for crushing. The crushed accumulator is continuously sent to the
hydraulic grading box by the screw conveyor. The heavy parts with large density
(i.e. metal particles) sink to the bottom of the grading box, which are taken away by
the screw conveyor. And the qualified metal particles after washing are sent to the
lead-based alloy production system by the belt conveyor. The light parts with low
density are sent to the horizontal sieve with the water flow. The material under the
screen is the oxide with small particle size (lead paste), which is sent to the filter press
by pump. The filter cake is sent to the melting system for processing, and the filtrate
is sent to the circulation tank for recycling. The organic matter on the screen flows
into another hydraulic grading box for grading. The plastic parts with low density
and the rubber parts with high density are separated and unloaded, respectively, by
the corresponding screw machine. The plastic and rubber parts are sent to the waste
plastic modified granulation comprehensive utilization system.
Using the natural gas as fuel, the lead alloy is smelted by the regenerative melting
pot. After added appropriate amount of antimony powder, the lead antimony alloy is
produced for sale.
Bullion Smelting
SKS Smelting
After proportion, the lead concentrate, lead paste, sulfur gold ore, and lead silver
residue sent to the mixing granulation workshop, which are mixed with the weighed
returning dust to be granulated. After granulation, the mixed lead bearing materials
are sent to the front furnace bin of smelting workshop by belt conveyor, which are
added into the SKS furnace by belt conveyor after measuring by the constant feeder.
Oxygen is sprayed into the furnace from the bottom. The rich slag, primary bullion,
dust and offgas are produced. The molten SKS slag flows directly into the RSKS
furnace through the launder for reduction smelting. The primary bullion is fed into
the molten lead pot through the tundish and chute for copper removal. The dust is
returned to the smelting system for through the scraper conveyor. After recovering
waste heat from waste heat boiler and collecting dust from electric dust collector, the
offgas is delivered to the sulfuric acid delivery plant to produce acid by the double
contact sulphuric acid process. And the tail gas after acid making is sent to the offgas
desulfurization system.