Method for pressurizing decomposing high-tin tungsten ore with mixed acid of phosphoric acid and sulfuric acid

The invention relates to a method for pressurizing decomposing a high-tin tungsten ore with mixed acid of phosphoric acid and sulfuric acid. According to the method, the improvements comprise the following that a reaction system is pressurized and the temperature of the reaction system is 110-250 DEG C in the process of extracting tungsten from a high-tin wolframite ore or high-tin black and whitetungsten mixed ore with the mixed acid of phosphoric acid and sulfuric acid, and tin concentrate can be obtained directly or through the ore dressing process from decomposed slag with the tungsten being already extracted. According to the method, by pressurizing, calcium-containing compounds do not need to be added to conduct conversion on the wolframite in the extracting process of the tungsten,the tungsten can be directly extracted from wolframite or the black and white tungsten mixed ore, meanwhile, the tin concentrate is obtained, so that the production process is simplified, and the production cost is reduced. 本