Production method for improving quality and yield of phosphoric acid

The invention discloses a production method for improving the quality and the yield of phosphoric acid. The method comprises drying and calcining operations, phosphate ores obtained after natural ore drying, calcining and purifying undergo wet phosphoric acid production as a raw material, and the content of impurities in the above obtained byproduct phosphogypsum is low, so the obtained phosphogypsum can be directly used as industrial gypsum. The method for producing phosphoric acid by drying the natural phosphate ore, calcining and carrying out heat treatment overcomes the disadvantages of the prior art. The method enabling the natural phosphate ores to be dried and calcined improves the activity of the reaction of P2O5 in the natural phosphate ores with sulfuric acid, so the reaction is full, the output of phosphoric acid is increased, impurities in sulfuric acid can be reduced, and sulfuric acid can be used in a grading manner; and the byproduct phosphogypsum can be directly used as the industrial gypsum d