Effect of Leaching Conditions on Dissolution Rate of Potassium from K-Feldspar Calcined Sample

Abstract

Potassium feldspar, phosphogypsum and coke are used as raw materials to obtain soluble salts of calcined sample through mechanical grinding, roasting activation and leaching with acid. A study has been conducted on the factors that affect the leaching ratio of K2O of calcined samples, such as the type and concentration of leaching medium, temperature, time, liquid-solid ratio. The experiments show under the conditions that concentration of citric acid of 2% (wt%), liquid-solid ratio of 4, leaching for 4 hours at room temperature, potassium dissolution rate can reach 76.81%.