Abstract: Based on ion exchange theory,the technology of extracting potassium by reaction among potassium feldspar,phosphorite,and sulfuric acid in a hydrothermal reactor was studied,which provided a theoretical basis for industrial application of the extraction of potassium from potassium feldspar.Experiments showed that the order of influence factors of potassium dissolution rate was as follows:raw material mix ratio>concentration of sulfuric acid>reaction time>dosage of sulfuric acid>reaction temperature.Suitable process conditions were as follows:mass ratio of potassium feldspar and phosphorite was 0.8∶1,sulfuric acid dosage was 4 mL/g,mass fraction of sulfuric acid was 70%,reaction temperature was 160 ℃,and reaction time 4 h.Potassium dissolution rate could be up to 74.1% under those conditions.

Key words: potassium feldspar, potassium extraction；technical study