Direct Analysis Sampler for Molten Steel
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Solution Overview
Problem
Conventional sampling devices for molten metals require extensive surface preparation and are inefficient in producing oxide-free samples for direct analysis by optical emission spectroscopy, leading to increased analysis time and costs due to the need for mechanical grinding and handling of large sample volumes.
Innovation Solution
A rapid chilled sampler with a sample chamber design that includes a distribution zone, analysis zone, and ventilation zone, allowing for uniform filling and rapid chilling of molten metal, eliminating the need for surface preparation and enabling direct analysis on optical emission spectrometers without additional cooling or preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sampling devices are used to extract molten metal samples, then samples can be obtained for analysis, but extensive surface preparation including mechanical grinding is required to achieve oxide-free analysis surfaces
Solution Approach 1:
The patent applies preliminary action by incorporating a deoxidant into the sample chamber before molten metal is introduced. This pre-preparation ensures that when the metal solidifies, the analysis surface is already oxide-free, eliminating the need for subsequent mechanical grinding and surface preparation steps.
Solution Approach 2:
The patent changes the chemical parameter of the sample chamber environment by introducing a deoxidant substance. This parameter change prevents oxide formation on the analysis surface during solidification, thereby achieving oxide-free surfaces without mechanical intervention.
2Quantity of substance
If conventional sampling devices with large sample chambers are used, then sufficient molten metal can be collected, but the samples require extensive handling and preparation procedures
Solution Approach 1:
The deoxidant is pre-introduced into the sample chamber to create a protective atmosphere before molten metal contact. This preliminary chemical preparation simplifies the entire sampling process by eliminating complex post-sampling preparation steps while maintaining adequate sample volume.
3Measurement precision
If rapid chilling is applied to achieve uniform solidification and oxide-free surfaces, then direct analysis becomes possible, but precise control of filling and cooling rates is required
Solution Approach 1:
By pre-introducing the deoxidant and establishing the chemical environment before solidification begins, the patent eliminates the need for complex active cooling control systems. The uniform solidification and oxide-free surface are achieved through this preliminary chemical preparation rather than complex thermal control.
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 sampler produces preparation-free, oxide-free metal samples that can be directly analyzed on existing OES equipment, reducing analysis time and costs by eliminating the need for mechanical grinding and surface preparation, while ensuring accurate and timely chemistry results.
Implementation Method 1
rapid chilling of the molten metal sample, such that the entire sample section freezes uniformly
Implementation Method 2
analyzed on an optical emission spectrometer
Data Source
AI summary
A sampler for taking samples from a molten metal bath, particularly a molten steel bath, includes a sample chamber assembly having a cover plate and a housing. The housing has an immersion end provided with an inflow conduit and including a sample cavity including a distribution zone, an analysis zone, and a ventilation zone. The sample cavity is dimensioned into four contiguous segments each of which has a respective length and depth. The four contiguous segments satisfy the formula: (L1/D1)+(L2/D2)+(L3/D3)+(L4/D4)>25.