Thermogravimetric Analyzer Mixing Mechanism for XRF Sample Fusion
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Solution Overview
Problem
Current methods for preparing samples for X-ray spectrometry analysis are tedious, time-consuming, and require manual handling of hot components, involving separate processes for loss on ignition/gain on ignition analysis and X-ray spectrometry, with ceramic crucibles not suitable for both analyses, leading to inefficiencies and inaccuracies due to the need for sample splitting and manual mixing.
Innovation Solution
A modified thermogravimetric analyzer with a unique sample holder and mixing mechanism that tilts and agitates within the furnace to create a homogeneous mixture of the sample and flux, allowing for simultaneous and automated loss on ignition/gain on ignition analysis and X-ray spectrometry sample preparation without operator assistance, using a metal sample holder with a flat bottom to prevent sticking and facilitate continuous processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate processes are used for loss on ignition/gain on ignition analysis and X-ray spectrometry sample preparation, then each analysis can be performed with dedicated equipment, but the overall process becomes time-consuming and labor-intensive
Solution Approach 1:
The patent combines loss on ignition/gain on ignition analysis and X-ray spectrometry sample preparation into a single integrated thermogravimetric analyzer. The instrument performs both functions sequentially using the same furnace and sample holder, eliminating the need for separate processes and reducing overall analysis time while maintaining the reliability of both analytical methods
Solution Approach 2:
The thermogravimetric analyzer is designed with multi-functionality to perform both loss on ignition/gain on ignition analysis and X-ray spectrometry sample preparation. The same furnace, sample holder, and control system are used for both analytical purposes, making the equipment universal and eliminating the need for separate dedicated devices
2Ease of manufacture
If manual handling of hot components and crucible cleaning is required, then sample preparation can be completed, but labor intensity and safety risks increase
Solution Approach 1:
The system performs sample preparation automatically without requiring manual handling of hot components. The integrated instrument completes fusion, cooling, and sample formation autonomously, eliminating the need for operators to manually handle hot crucibles or perform cleaning operations, thereby improving safety and reducing labor intensity
3Measurement precision
If ceramic crucibles are used for loss on ignition/gain on ignition analysis, then volatile material analysis is accurate, but the crucibles are not suitable for X-ray spectrometry due to sticking issues
Solution Approach 1:
The patent employs a single sample holder design that serves both loss on ignition/gain on ignition analysis and X-ray spectrometry sample preparation. The sample holder is engineered with properties that prevent sticking during fusion while maintaining accuracy for volatile material measurement, making it compatible with both analytical methods without requiring separate crucibles
4Reliability
If sample splitting is performed for separate analyses, then both analyses can be conducted, but accuracy decreases due to heterogeneity
Solution Approach 1:
The integrated system performs both loss on ignition/gain on ignition analysis and X-ray spectrometry sample preparation on the same undivided sample. The sample remains in the same holder throughout the process, eliminating heterogeneity issues that arise from sample splitting and ensuring both analyses reflect the identical original composition
5Manufacturing precision
If manual mixing of sample and flux is performed, then homogeneous mixture can be achieved, but time consumption and labor increase
Solution Approach 1:
The system automatically mixes the sample and flux through the fusion process itself. The thermogravimetric analyzer performs heating, melting, and homogenization in sequence without requiring manual mixing operations, maintaining mixture homogeneity while significantly increasing preparation throughput and eliminating labor-intensive steps
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
This approach significantly reduces labor, time, and costs by enabling fully automated, continuous processing of multiple samples, improving accuracy and reproducibility by integrating both analyses in a single instrument, eliminating the need for manual handling and crucible cleaning, and ensuring accurate volatile material compensation in X-ray spectrometry results.
Implementation Method 1
The sample to be analyzed is in powder form and generally is dissolved with a lithium borate flux in a ratio 1:5, 1:10, or 1;14 at approximately 1050 C
Implementation Method 2
The apparatus automatically mixes the material to be analyzed with flux to form the sample in each sample holder by repeatedly tilting the sample holders in different directions
Implementation Method 3
agitating the contents of the sample holders by rapidly moving the carousel back and forth with sudden stops
Implementation Method 4
The sample is weighed prior to being placed in the furnace and after it is heated to the desired temperature within the furnace. The weights are then compared to ascertain the amount of moisture and other volatile substances present in the sample
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The analyzer mixes the material to be analyzed and the flux in sample holders supported by a moveable platform within the furnace. A tilt member is provided having multiple stations. Each station has an upstanding pin offset from the center point of the station in a different direction. The platform is indexed relative to the tilt member such that the sample holder aligns with each station, in sequence. As the sample holder aligns with each station, the platform is moved toward the tilt member such that the pin of the aligned station abuts and tilts the sample holder in a different direction. The repeated tilting of the sample holder in different directions mixes the material and flux. The contents of the sample holder may also be agitated by rapidly moving the platform back and forth with sudden stops. The analyzer can be used with a special sample holder.