Pyrolytic Graphite Crystal Diffractor for Slurry XRF Analysis
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Solution Overview
Problem
X-ray fluorescence analysis in the mining industry faces challenges in accurately detecting low concentrations of elements with atomic numbers between 41 and 60 in slurry samples due to low intensity fluorescent radiation and statistical errors, especially when the slurry is in continuous flow, requiring fast measurement times to monitor refining processes effectively.
Innovation Solution
An X-ray fluorescence analyzer system utilizing a pyrolytic graphite crystal to separate characteristic fluorescent radiation and a high-energy resolution detector to accurately detect and subtract background radiation, ensuring precise measurement of elements with atomic numbers between 41 and 60, even at short measurement times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement time is extended to improve detection accuracy of low concentration elements, then measurement precision improves, but productivity decreases due to continuous slurry flow requirements
Solution Approach 1:
The patent uses a pyrolytic graphite crystal to create a spectral copy or filtered version of the fluorescent radiation, separating the characteristic radiation of interest from the continuous background. This allows the detector to focus on the specific energy range containing the element signals, improving signal-to-noise ratio and enabling accurate detection at shorter measurement times.
Solution Approach 2:
The patent changes the energy resolution parameter of the detection system by using a detector with better than 600 eV energy resolution at the characteristic fluorescent radiation energy. This parameter improvement allows better separation of overlapping peaks and background radiation, enabling accurate measurement of low concentration elements within the required short measurement time window.
2Measurement precision
If energy resolution is improved to detect low concentration elements, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent introduces a pyrolytic graphite crystal as an intermediary component between the slurry sample and the detector. This crystal acts as a wavelength-dispersive element that separates the fluorescent radiation by energy, allowing the detector to receive only the characteristic radiation of interest. This intermediary simplifies the detection task by pre-filtering the radiation spectrum before it reaches the detector.
3Measurement precision
If pyrolytic graphite crystal is used to separate characteristic fluorescent radiation, then measurement precision improves, but device complexity increases
Solution Approach 1:
The pyrolytic graphite crystal represents a relatively simple and cost-effective diffracting element compared to more complex spectral separation systems. Graphite is an inexpensive material that can be formed into the required crystal geometry, providing effective wavelength dispersion without requiring complex mechanisms or expensive components. The simplicity of this component helps offset the added complexity of the overall system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides accurate and reliable detection of small concentrations of elements in slurry samples, enhancing the ability to monitor refining processes in real-time by improving the energy resolution and diffraction efficiency, thereby reducing statistical errors and maintaining measurement precision.
Implementation Method 1
a first crystal diffractor located in a first direction from said slurry handling unit. Said first crystal diffractor is configured to separate a predefined first wavelength range from fluorescent X-rays
Implementation Method 2
a detector the energy resolution of which is relatively accurate to detect the collected fluorescent radiation
Data Source
AI summary
An X-ray fluorescence analyzer system including an X-ray tube, a slurry handling unit, and a crystal diffractor located in a first direction from the slurry handling unit. The crystal diffractor separates a predefined wavelength range from fluorescent X-rays that propagate into the first direction, and directs the fluorescent X-rays in the separated predefined wavelength range to a radiation detector. The crystal diffractor includes a pyrolytic graphite crystal. The predefined wavelength range includes characteristic fluorescent radiation of a pre-defined element of interest with its atomic number Z between 41 and 60, the ends included. An energy resolution of the radiation detector is better than 600 eV at the energy of the characteristic fluorescent radiation.