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

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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
- Extraction of potassium from K-feldspar via the CaCl₂ calcination route
- 中国化学工程学报（英文版） 2015年23卷第9期页码：1557-1564
- 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
  中图分类号：
- 纸质出版：2015
- Accepted：
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Bo Yuan, Chun Li, Bin Liang, 等. Extraction of potassium from K-feldspar via the CaCl₂ calcination route[J]. 中国化学工程学报（英文版）, 2015,23(9):1557-1564. DOI: 10.1016/j.cjche.2015.06.012.

calcination route[J]. , 2015, 23(9): 1557-1564.
Bo Yuan, Chun Li, Bin Liang, 等. Extraction of potassium from K-feldspar via the CaCl₂ calcination route[J]. 中国化学工程学报（英文版）, 2015,23(9):1557-1564. DOI: 10.1016/j.cjche.2015.06.012. 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.

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

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

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references

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

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