Optimization of hydrothermal activation process of potassium feldspar
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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