The process of potassium release from illite was investigated by a flux method, and the effect of relevant factors on the rate of potassium release was discussed. The results show that calcium chloride additive has a great effect on the potassium release rate from illite and the potassium release rate is 95.84% under the optimum experimental conditions. Based on the dynamics analysis, therate of potassium release process is controlled by an internal diffusion mode. The rate of potassium leaching of calcined...