Abstract: Every year millions of tons of waste dry battery are scrapped in China，as well as large amounts of waste sulfuric acid from titanium dioxide industry.This not only wastes a lot of resources，but also seriously pollutes the environment. According to the characteristics of waste dry battery and titanium dioxide waste sulfuric acid，the technology using titanium dioxide waste sulfuric acid to leach waste dry battery has been studied.Through purifying procedures，such as vulcanization， oxidation heating，substitution，hydrolysis，and fluorination，manganese zinc ferrite was prepared by coprecipitation method.The results of test showed that its initial magnetic permeability was more than 8 000 H/m and the mass fraction of impurity was less than 1×10^-4.This process is treating waste by waste.The main ingredients in the waste do not need to separate from each other，which can be used to prepare higher-value added manganese zinc ferrite，directly and a small amount of impurity elements can be also removed and disposed through purification.

Key words: waste dry battery, titanium dioxide waste sulfuric acid, Mn-Zn ferrite