The process of extracting potassium from calcium oxide and potassium feldspar by hydrothermal chemical method was studied and the conditions were optimized.The effects of reaction time,reaction tem-perature,liquid-solid ratio and nCa/n(Si+Al)on the activation of potassium feldspar were discussed.Through orthogonal test,the optimum technology of potassium feldspar activation extraction was deter-mined.The crystal shape of the treated filter slag was studied by X-ray diffraction and Fourier infrared.The results showed that the leaching rate of potassium is up to 89.24％under the optimum reaction con-dition of CaO.After treatment,the filter residue is mainly composed of potassium nepheline,hydrocalcium-aluminite and grape stone with good integrity and crystallinity,indicating that the crystal structure of po-tassium feldspar has been destroyed.
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