Method for leaching gold, platinum and palladium from high-silver-content material through coordination of sodium chlorate in sectional mode

The invention discloses a method for leaching gold, platinum and palladium from a high-silver-content material by coordinating with sodium chlorate in a sectional manner, which comprises the following steps: during leaching in a chlorine salt system, a silver chloride film generated in the leaching process is attached to the surfaces of material particles, so that the generation thickness of silver chloride is controlled by adopting a pulse type adding manner; and then in the stirring process, particle friction assists the silver chloride film to fall off, it is ensured that the leaching agent, the oxidizing agent and the material particles make continuous contact and act, and the precious metal leaching efficiency is improved. According to the method, a sectional type-coordinated sodium chlorate method is adopted, namely a two-section or three-section mode of coordinating addition of sodium chlorate and consumption of sodium chlorate through leaching is adopted, the oxidation strength of a solution system is