Method for preparing high-quality red lead by lead slime of lead-acid batteries

The invention relates to a method for preparing high-quality red lead from lead slime of a waste lead-acid battery. The invention includes the following steps: the lead slime in the waste lead-acid battery is taken out and mixed with no regard of cathode and anticathode; then the lead slime is repeatedly washed to neutral and is dried and triturated to lead slime powder with granularity above 200 meshes; the lead slime powder is mixed with water solution containing dispersant and desulfurizer by a certain proportion; the mixture is adequately stirred and decarbolized under 25 to 90 DEG C for 1 to 24 hours; the liquid part is removed and the lead containing solids is washed to neutral; the material is tiled in a box style muffle furnace or a tube furnace to have a thickness of 1 to 20 cm and is roasted under temperature of 400 to 500 DEG C for 2 to12 hours; then the red lead is prepared. The invention method has the advantages of low preparation cost, high lead recycling ratio, high quality, lower energy consumption and lower environment pollution.