Method for preparing lead oxide by using lead-acid storage battery positive electrode plate coating waste lead paste

The present invention discloses a method for preparing lead oxide by using lead-acid storage battery positive electrode plate coating waste lead paste. The method comprises: 1) drying waste lead paste, and detecting the mass content of lead sulfate in the waste lead paste; 2) weighing a certain amount of waste lead paste, adding a prepared desulfurization solution, and reacting with the lead sulfate in the waste lead paste so as to finally remove the lead sulfate in the waste lead paste; 3) carrying out solid-liquid separation on the reaction product obtained in the step 2), and washing the obtained filter cake with deionized water until no desulfurization solution exists; 4) drying the filter cake prepared in the step 3), and crushing the dried filter cake to prepare powder; and 5) calcining the powder prepared in the step 4) in a high temperature furnace to obtain the lead oxide. According to the present invention, the positive electrode additive lead oxide capable of being recycled by the lead-acid storage battery is prepared through the simple and easy-performing method, the raw materials are easy to obtain, the components of the positive electrode waste lead paste of most of the lead-acid storage battery manufacturing companies are substantially the same, the substance stability is good, and the method is suitable for large-scale promotion.