Fluorine in copper concentrate applying Metrohm Combustion IC

Importance of the Topic

Fluorine is a common corrosive impurity in copper concentrates that can damage smelting equipment and affect process efficiency. Reliable quantification of fluoride is critical for quality control in metal production.

Objectives and Overview of the Study

This application note demonstrates a combustion ion chromatography (Combustion IC) method using Metrohm sacrificing vial technology to determine fluorine levels in copper concentrate. The approach aims to deliver accurate, reproducible results while protecting instrument components from aggressive sample constituents.

Methodology

The sample is placed in a horizontal quartz vial flanked by quartz wool, creating a sacrificing vial that traps destructive elements during combustion. Combustion occurs at 1050 °C under a flow of argon and oxygen. Released combustion gases are absorbed in a hydrogen peroxide solution and transferred to the IC system by a partial loop injection technique with inline matrix elimination. Suppressed conductivity detection quantifies fluoride.

Instrumentation

The analysis was performed on a 930 Compact IC Flex system equipped with combustion module, absorber module, IC conductivity detector and autosampler MMS 5000. Columns used include Metrosep A Supp 5, Metrosep A Supp 4/5 guard and Metrosep A PCC 1 HC. The setup incorporates a solid sampling kit and adapter sleeve for suppressor vario.

Main Results and Discussion

Fluorine was quantified at an average concentration of 365 µg/g with a relative standard deviation of 9.2% (n=19). Chlorine and sulfur were not detected under the selected conditions. The sacrificing vial effectively protected the quartz tubes, ensuring stable operation over multiple analyses.

Benefits and Practical Applications of the Method

• High accuracy and reproducibility for fluoride analysis in solid samples
• Protection of combustion tube from corrosive and aggressive components
• Applicable to quality control in copper concentrate production and similar materials

Future Trends and Potential Applications

Advances may include integration with automated sample preparation, coupling with hyphenated techniques for multi-element analysis, miniaturized combustion cells, and enhanced data processing for real-time process monitoring.

Conclusion

The Metrohm Combustion IC method with sacrificing vial technology provides a robust and reliable approach for fluoride determination in copper concentrates, combining accurate quantitation with instrument protection. Its performance and reproducibility make it a valuable tool for industrial quality control.

Reference

IC Application Note CIC–017 Metrohm Combustion IC