Study on roasting-extracting potassium from the potassium-rich shale

The experiment of roasting-extracting potassium from the potassium-rich shale in Caoyang is completed. XRD anaylsis and thermal analysis is carried out for mixed materials of the mass ratio of sodium hydroxide to shale being 0.7. And in different roasting temperature and in the course of heating-up main phase in the shale sample and variation of phase is confirmed preparatorily. At the same time, through the experiment of roasting-extracting potassium, fitting condition of roasting-extracting potassium is found, and phase analysis for the water-insoluble after extracting potassium is progressed by XRD. Abstract:The main factors that affect the leaching rate of potassium in potash feldspar were studied. It is shown that potash feldspar and sericite is transmuted into kaliophilite that can dissolve in hot acid; in the suitable conditions, the extracting ratio of potassium reach 88.08%.