Study on extraction of potassium from K-feldspar by roasting-leaching of mixed salts
Potash resources are scarce in China,and K-feldspar is an important form of potassium occurrence.However,the development of K-feldspar involves significant technical challenges and high costs,and industrial utilization has not yet been achieved.To address issues like high temperatures and low leaching rates during the development and utilization of K-feldspar,the K-feldspar ore from the Guizhou Tongren was selected as research target in this study,and the mixed-salt roasting-leaching process of K-feldspar-sodium sulfate-calcium carbonate was investigated.The effects of factors such as the ratios of K-feldspar-sodium sulfate-calcium carbonate roasting,roasting temperature,roasting time,and leaching reagent on the leaching rate of potassium elements in K-feldspar were explored.The experimental results indicated that under condi-tions of uniform roasting mixture,roasting temperatures within the range of 800∼900℃,roasting time of 1 h,a roasting com-position ratio of ore,sodium sulfate,and calcium carbonate at(1∶1∶6)～(1∶1∶8),and leaching using a mass fraction of 5%NaOH solution,the leaching rate of potassium could reach as high as 99.79%.This study offered a new approach to enhance the efficiency of K-feldspar resource utilization and address potassium resource supply issues.Moreover,it provided robust technical support for relevant industrial production.
K-feldsparcalcinationleaching of potassiumthermodynamic
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