钾长石混盐焙烧-浸出提钾过程研究

doi:10.19964/j.issn.1006-4990.2023-0386

Abstract

Abstract:

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

CLC Number:

O614.11

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.

Figures/Tables 9

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National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on extraction of potassium from K-feldspar by roasting-leaching of mixed salts

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