Inorganic Chemicals Industry >
Study on extraction of potassium from K-feldspar by roasting-leaching of mixed salts
Received date: 2023-07-21
Online published: 2024-05-15
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 conditions of uniform roasting mixture，roasting temperatures within the range of 800∼900 ℃，roasting time of 1 h，a roasting composition 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.
Key words： K-feldspar; calcination; leaching of potassium; thermodynamic
FANG Xiaoning , KUANG Fei , LIU Chenglin . Study on extraction of potassium from K-feldspar by roasting-leaching of mixed salts[J]. Inorganic Chemicals Industry, 2024 , 56(5) : 53 -57 . DOI: 10.19964/j.issn.1006-4990.2023-0386
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