ANALYSIS OF LIMESTONE USING A LOW POWERED WDXRF SYSTEM

The approximately 970+ power plants that burn oil and coal to produce electricity in America have been sited as a major source of Sulfur Dioxide (SO2) emissions. This pollutant can irritate the upper respiratory tract and damage lung tissue, as well as yellowing plant leaves and eating away iron, steel, marble and other solid materials. Through this, the demand for limestone is increasing due to a legislated requirement for SO2 flue gas desulphurization systems (scrubbers) to be installed in these facilities. Because of this ever increasing demand, limestone quarry lab technicians are required to take samplings frequently and respond quickly to certify product ready to release by truck or train load.

This discussion demonstrates an efficient method for limestone analysis using a pressed pellet technique combined with a low powered WDXRF system. The analysis of light elements, such as sodium and magnesium, can be performed with better sensitivity and overall improved element resolution compared to similar EDXRF units and without the need of higher powered WDXRF systems. The target area for this procedure are the limestone quarries but it can be seen that down-line companies can also benefit from this routine as the method satisfies the ASTM repeatability requirements for C1271 (Standard Test Method for X-ray Spectrometric Analysis of Lime and Limestone). Quarries obtain the added bonus of also being able to analyze typical geo-exploration samples for pit development/expansion.