Method for extracting gold platinum and palladium from platinum and palladium concentrate

The invention provides a method for extracting gold platinum and palladium from platinum and palladium concentrates. The method comprises the steps that a, the platinum and palladium concentrate is leached through nitric acid, and nitrate leach residues and nitrate leach liquid are obtained; b, according to the nitrate leach liquid, the nitric acid serves as an oxidizing agent, ammonium chloride is added into the nitrate leach liquid, and ammonium tetrachloropalladate and immerse palladium subsequent liquid are obtained; c, the nitrate leach residues are subjected to acid leaching through chloroazotic acid, and chloroazotic acid residues and chloroazotic acid liquid are obtained; d, the chloroazotic acid liquid is subjected to denitration through urea, SO2 is introduced into the chloroazotic acid liquid, and coarse gold powder and reductive gold subsequent liquid are obtained; e, the reductive gold subsequent liquid is heated and concentrated, the pH of the reductive gold subsequent liquid is adjusted to 1, the reductive gold subsequent liquid is heated to 100 DEG C, the ammonium chloride is added into the reductive gold subsequent liquid, and ammonium chloroplatinate is obtained; f, the ammonium tetrachloropalladate and the ammonium chloroplatinate are subjected to reduction through hydrazine hydrate, coarse sponge palladium and coarse sponge platinum are obtained, and qualified sponge palladium and qualified sponge platinum are obtained through refining. The technical process is simple, low in cost, easy to operate and high in precious metal recovery rate.