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Long‐term research on key techniques of clean utilization of potassic rocks from over twenty localities has been performed to settle the shortage of soluble potassium resources in China. The results show that K‐feldspar as the principal mineral enriched in potassium could be decomposed in the media of Ca(OH)2, NaOH, KOH‐H2O solution via hydrothermal treatment, into tobermorite, hydroxyl‐cancrinite,...
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