New Cement PGNAA On-line Elemental Analyzer
Australian instrumentation technology company Real Time Instruments (RTI) has recently completed development of an online cement PGNAA elemental analyzer for use in stockpile building and raw mix blending
RTI CEO, Dr James Asbury, said that the commercial release of the AllScan® Cement PGNAA online elemental analyser signifies a new era in online elemental analysis in the cement industry.
Online elemental analysers are commonly installed in cement mills that produce more than 5000 tons per day of clinker. They are typically mounted on the feed belt to the raw mill where they analyse the key elements in the raw mix. Via a feedback loop they are used to control the raw mix bin weighfeeders. Elemental analysers are also installed on the belt from the quarry, normally after the secondary crusher, where their use can result in significant improvements in pre-blending performance, through improved utilization of quarry materials and homogenized building of the stockpiles to desired specifications.
Like other online elemental analysers, the AllScan® uses PGNAA (prompt gamma neutron activation analysis) technology to detect and measure individual elements. However, unlike other PGNAA analyzer’s on the market, the AllScan® incorporates a highly advanced algorithm that ensures that accuracy is maintained irrespective of belt loading and variable profiling.
A drop off in accuracy under varying belt loading and profiling conditions has always been a technical challenge for online elemental analysis. And a major concern for customers. The Dura-G™ neutron modelling software incorporated in the AllScan® separates the influence of profile and bed depth variation from elemental variation, thus enabling accurate results, even at very low bed depths and in situations of erratic profiling. This is a world-first.
Additionally, the Dura-G™ neutron modelling software can identify and alarm on harmful and unwanted trace elements that might be present in the material, even at extremely low concentrations. Elements such as Chlorine and Gadolinium can be detected at levels in the parts per million. RTI is currently undertaking testing for Mercury and Arsenic and expects to be able to measure these elements of concern at concentrations in the parts per billion; levels previously not possible using online elemental analysis.
Apart from being the most accurate PGNAA elemental analyzer on the market the AllScan® is the easiest to install, calibrate, set up and maintain, says Dr Asbury. One of the big frustrations that customers have with existing elemental analyzers is the time and effort that it takes to install, set up and calibrate. When we developed the AllScan® we were adamant that the end product had to be the most accurate analyzer on the market and the easiest to set up and maintain. We believe that we have achieved this. The AllScan® arrives on site fully factory calibrated. It typically takes less than 12 hours to install on the conveyor belt and requires no modifications to the conveyor stringers. After a simple standardization procedure that takes about half a day the AllScan® is fully set up and reporting accurate results to the plant DCS.
The AllScan® is manufactured in Australia. All parts are made from non-corrosive materials and fully ruggedized for harsh industrial application, ensuring a long field life and very low maintenance costs.