Method for separating and recovering tellurium and cadmium from cadmium telluride

The invention provides a method for separating and recovering tellurium and cadmium from cadmium telluride, which comprises the following steps: S1, uniformly mixing a cadmium telluride sample with excessive alkali, and roasting in an oxygen-containing atmosphere at 1100-1200 DEG C, the molar ratio of oxygen in the oxygen-containing atmosphere to cadmium telluride in the cadmium telluride sample being oxygen: cadmium telluride = (3-3.5): 2; s2, adding water into a mixture obtained after the reaction in the step S1, mixing to obtain a dispersion liquid, and filtering to obtain a solid cadmium-containing byproduct and a tellurium-containing solution; and S3, adding acid into the tellurium-containing solution obtained in the step S2 to adjust the pH value of the solution to be acidic, and after the reaction is completed, filtering to obtain tellurium dioxide and a tellurium-precipitated solution. Cadmium telluride reacts with oxygen and alkali to generate tellurite and cadmium hydroxide, and tellurium and cadmiu