Determination of High Concentration of Fluorine in Lithium Mica by X-ray Fluorescence Spectrometry with Pressed-Powder Pellets

Jiang-ping ZENG; Xiao-li LI; Nan ZHANG; Jia-song WANG; Shuang WEI; Na WANG

doi:10.15898/j.cnki.11-2131/td.201804060038

Rock and Mineral Analysis > 2019 > 38(1): 71-76. > DOI: 10.15898/j.cnki.11-2131/td.201804060038

Jiang-ping ZENG, Xiao-li LI, Nan ZHANG, Jia-song WANG, Shuang WEI, Na WANG. Determination of High Concentration of Fluorine in Lithium Mica by X-ray Fluorescence Spectrometry with Pressed-Powder Pellets[J]. Rock and Mineral Analysis, 2019, 38(1): 71-76. DOI: 10.15898/j.cnki.11-2131/td.201804060038

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Determination of High Concentration of Fluorine in Lithium Mica by X-ray Fluorescence Spectrometry with Pressed-Powder Pellets

1.
Tianjin Center of Geological Survey, China Geological Survey, Tianjin 300170, China
2.
Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China

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Received Date: April 05, 2018
Revised Date: July 29, 2018
Accepted Date: August 09, 2018
Published Date: December 31, 2018

Abstract

HIGHLIGHTS
(1) A simple, fast, and accurate method for the determination of high concentrations of fluorine in lithium mica by X-ray Fluorescence Spectrometry with pressed-powder pellets was established.

(2) Determination consistency with the ion selective electrode method was proved.

(3) The working curve was made by adding artificial formulation calibration materials, and the matrix effect and spectral interference were corrected by experience coefficient.

ABSTRACT

BACKGROUNDThe fluorine content in lithium mica is very high (1.36% to 8.71%), and the leaching rate of lithium during roasting lithium mica minerals decreases gradually with the increase of fluorine content. With increased defluorination of lithium mica, the leaching rate of lithium is also increased accordingly. Therefore, accurate determination of fluorine in lithium mica and control of fluorine content can provide a basis for determining the process conditions, equipment parameters and cost of roasting process. At present, the most common used method for determination of fluorine is the ion selective electrode method. However, the process is complex, the analysis time is long and the blank value is high. X-ray Fluorescence Spectrometry (XRF) is a green and pollution-free method, which is simple, fast and accurate.
OBJECTIVESTo determine the fluorine content in lithium mica.
METHODSThe fluorine content in lithium mica was determined by XRF with pressed-powder pellets. The working curve was made from standard material lithium ore and manually prepared calibration material, and the experience coefficient was used to correct the matrix effect and spectral interference.
RESULTSThe method precision(RSD, n=10) is 1.03% and the detection limit of fluorine is 46±4μg/g. Analytical results of samples synthesized from standard samples acquired by this method are in good agreement with theoretical values. It is demonstrated by actual samples that the determination results are consistent with those of the ion selective electrode method.
CONCLUSIONSThis method is suitable for determining fluorine in lithium mica with contents ranging from 0.68% to 9.14%.
- lithium mica,
- fluorine,
- experience coefficient correction,
- pressed-powder pellets,
- X-ray Fluorescence Spectrometry

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Determination of High Concentration of Fluorine in Lithium Mica by X-ray Fluorescence Spectrometry with Pressed-Powder Pellets

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