Determination of Fluorine Content in Coal Samples using Metrohm Combustion IC

Introduction

Coal includes a percentage of chlorine, fluorine, and sulfur compounds. When the coal is combusted, corrosive acids are released by these compounds, for instance, hydrofluoric acid is formed by fluorine compounds.

Therefore, thermal power plants need to use low-fluorine coal in order to prevent the formation of hydrofluoric acid on a massive scale. This article covers the determination of the fluorine content in a coal sample after hydropyrolysis using ion chromatography.

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Sample

Coal

Sample preparation

In this work, the sample analysis is performed by Metrohm Combustion IC with flame sensor technology and intelligent Partial Loop Injection Technique with Inline Matrix Elimination.

Columns

Metrosep A Supp 5 - 150/4.0

6.1006.520

Metrosep A Supp 4/5 Guard/4.0

6.1006.500

Metrosep A PCC 1 HC/4.0

6.1006.310

Metrosep A Trap 1 - 100/4.0

6.1014.000

Metrosep I Trap 1 - 100/4.0

6.1014.200

Solutions

Eluent

3.2 mmol/L sodium carbonate 1.0 mmol/L sodium hydrogen carbonate

Suppressor regenerant

100 mmol/L sulfuric acid

Rinsing solution

STREAM

Absorber solution

200 mg/L hydrogen peroxide

Parameters

Flow rate

0.7 mL/minutes

Injection volume (IC)

50 μL (MiPT)

Pmax

15 MPa

Recording time

12 minutes

Column temperature

30 °C

Combustion parameters

Argon

100 mL/minutes

Oxygen

300 mL/minutes

Oven temperature

1100 °C

Post-combustion time

400 s

Initial volume of absorption solution

2.0 mL

Water inlet

0.2 mL/minutes

Analysis

Conductivity after the sequential suppression

Instrumentation

930 Compact IC Flex Oven/SeS/PP/Deg

2.930.2560*

IC Conductivity Detector

2.850.9010*

MSM Rotor A

6.2832.000*

Adapter sleeve for Suppressor Vario

6.2842.020*

920 Absorber Module

2.920.0010*

Combustion Module (oven and ABD)

2.136.0700*

Autosampler MMS 5000

2.136.0800

Kit for solid sampling

6.7302.000

* Available as 930 Metrohm Combustion IC (2.930.9010)

Results

1 Fluorine [mg/kg]

2 Chlorine [mg/kg]

3 Unknown

4 Sulfur

Coal

87.9

55.8

-

n.q.

This information has been sourced, reviewed and adapted from materials provided by Metrohm AG.

For more information on this source, please visit Metrohm AG.

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