During the waste battery recycling process, lead paste is abundant of lead sulfate whose recovery rate highly influences the profit of battery recycling and the capability of market competition. This project tends to improve the existing battery recycling technology for lead paste in the waste automotive batteries. Current available technologies for waste automotive battery recycling use sodium carbonate, ammonium carbonate, sodium hydroxide, and sodium chloride, to substitute lead sulfate to lead carbonate and chloride in the lead paste. This project firstly apply ammonium bicarbonate as desulfurization reagent, which can be produced by absorbing carbon dioxide in the flue gas with ammonia solution. This innovative technology can not only produce ammonium bicarbonate, but also reduce the emission of greenhouse gases from stacks. The advantages of this innovative technology include high purity and price of lead products, high recycling efficiency of waste automotive battery, low emission of air pollutants, less corrosion problems of pipelines, low energy consumption, and no odorous pollution problems. Experimental results indicated that ammonium bicarbonate can be used as lead paste desulfurization desulfurization agent and have a good efficiency. This project apply ammonium bicarbonate as desulfurization reagent, which can be produced by absorbing carbon dioxide in the flue gas with ammonia solution.This innovative technology can produce ammonium bicarbonate. Ammonium sulfate can react with calcium hydroxide and carbon dioxide to produce ammonium bicarbonate. Compared with the traditional fire assay, the smelting temperature of lead carbonate reduction process, can be reduced to a temperature of 850℃ for lead ingots.

waste battery, lead paste, ammonium bicarbonate, ammonia solution, carbon dioxide