This system is connected with the waste lead-acid battery breaking and separation system, established after lead paste pump out from paste storage tank. System function: when paste pumped into the pre-desulfurization tank, adds sodium carbonate to conduct desulfurization reaction, and the stirring sufficiently. At the same time, mixed lead paste liquid will be pumped into desulphurizer, after forced desulphurization return to pre-desulphurization tank. Then pump lead carbonate sediment and liquid into the filter press machine to filter press. Obtained cake （lead carbonate） enters the smelting system and sodium sulfate solution enters sodium purification, crystallization, drying systems.
1 . Lead paste desulfurization disposal capacity: 20 m3 / h （design according to customer request accepted）， with annual handling of 70,000 tons.
2 . After desulfurization pastel sulfur content < 0.5%
3 . After the filter press paste water content < 13%
4 . System control: centralized PLC control. Selection guide