Extraction of potassium from K-feldspar via the CaCl<sub>2</sub> calcination route

Bo Yuan; Chun Li; Bin Liang; Li Lü; Hairong Yue; Haoyi Sheng; Longpo Ye; Heping Xie

doi:10.1016/j.cjche.2015.06.012

Your Location：

Home >

Browse articles >

Extraction of potassium from K-feldspar via the CaCl₂ calcination route

能源、资源与环境技术 | Updated：2026-01-06

- Extraction of potassium from K-feldspar via the CaCl₂ calcination route
- Chinese Journal of Chemical Engineering Vol. 23, Issue 9, Pages: 1557-1564(2015)
- Affiliations：
  
  1. Multi-phases Mass Transfer and Reaction Engineering Laboratory, College of Chemical Engineering, Sichuan University,Chengdu,China,610065
  2. Mineralization and Utilization,Chengdu,China,610065
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2015.06.012
  CLC：
- Published：2015
- Accepted：
Scan QR Code
calcination route[J]. , 2015, 23(9): 1557-1564.
DOI：

calcination route[J]. , 2015, 23(9): 1557-1564. DOI： 10.1016/j.cjche.2015.06.012.

摘要

Abstract

The extraction of potassiumfrom K-feldspar via a calcium chloride calcination route was studied with a focus on the effects of the calcination atmosphere

calcination temperature and time

mass ratio of CaCl

to K-feldspar ore and particle size of the K-feldspar ore. The results demonstrated that a competing high-temperature hydrolysis reaction of calcium chloride with moisture in a damp atmosphere occurred concurrently with the conversion reaction of K-feldspar with CaCl

thus reducing the amount of potassium extracted. The conversion reaction started at approximately 600 ℃ and accelerated with increasing temperature. When the temperature rose above 900 ℃

the extraction of potassium gradually decreased due to the volatilization of the product

KCl. As much as approximately 41% of the potassium was volatilized in 40 min at 1100 ℃. The mass ratio of CaCl

/ K-feldspar ore significantly affected the extraction. At a mass ratio of 1.15 and 900 ℃

the potassium extraction reached 91% in 40 min

while the extractionwas reduced to only 22% at the theoreticalmass ratio of 0.2. Optimal process conditions are as follows: ore particle size of 50-75 μm

tablet forming pressure of 3 MPa

dry nitrogen atmosphere

mass ratio of CaCl

/ore 1.15:1

calcination temperature of 900 ℃

and calcination time of 40 min. The XRD analysis revealed that a complex phase transition of the product SiO

was also accompanied by the conversion reaction of K-feldspar/CaCl

. The SiO

product formed at the initial stagewas in the quartz phase at 900 ℃ and was gradually transformed into cristobalite after 30 min.

关键词

Keywords

references

Views

Downloads

CSCD

Alert me when the article has been cited

Submit

Tools

Publicity Resources

Decomposition behavior of CaSO4 during potassium extraction from a potash feldspar-CaSO4 binary system by calcination

Enhanced electrochemical nitrate removal from groundwater by simply calcined Ti nanopores with modified surface characters

Surface and structure characteristics of commercial K-Feldspar powders: Effects of temperature and leaching media

The extraction of potassium from K-feldspar ore by low temperature molten salt method

An efficient methodology for utilization of K-feldspar and phosphogypsum with reduced energy consumption and CO2 emissions

Related Author

Bin Liang

Xiaowei Hu

Guoquan Zhang

Chun Li

Li Lü

Jia Huang

Xuejiao Ma

Jindun Xu

Related Institution

School of Chemical Engineering, Sichuan University

Department of Environmental Engineering, Beijing Institute of Petrochemical Technology

School of Engineering and Built Environment, Griffith University

Institute of Transportation, Inner Mongolia University

School of Art and Architecture, Xiamen Xingcai Vocational & Technical College

⁰

Extraction of potassium from K-feldspar via the CaCl2 calcination route

DOI：10.1016/j.cjche.2015.06.012

摘要

Abstract

关键词

Keywords

references

Extraction of potassium from K-feldspar via the CaCl₂ calcination route