Steelmaking Slag Free Lime Estimation Using LIBS Spectra
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Solution Overview
Problem
Existing methods for quantifying the free lime content in steelmaking slag are complex, time-consuming, and lack accuracy, leading to inconsistent aging treatment and potential expansion issues in steelmaking slag used for road construction.
Innovation Solution
A method using laser-induced breakdown spectroscopy (LIBS) to estimate free lime content by analyzing the emission spectrum of steelmaking slag, employing a partial least squares regression model to correlate emission line intensities with free lime content, enabling rapid and accurate estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods (ethylene glycol extraction, thermogravimetric analysis) are used to quantify free lime content, then measurement capability is achieved, but the process becomes complex and time-consuming
Solution Approach 1:
The patent replaces complex chemical extraction and thermal analysis methods with laser-induced breakdown spectroscopy (LIBS), which uses laser plasma emission to directly measure free lime content. This substitution of measurement methodology eliminates the need for multi-step chemical procedures while achieving accurate quantification through spectral analysis of Ca, Fe, and Si emission lines.
Solution Approach 2:
The patent introduces an estimation model that uses emission spectrum intensities as an intermediary to determine free lime content. Instead of directly measuring free lime through complex chemical means, the model correlates the intensities of specific emission lines (Ca, Fe, Si) with free lime concentration, providing a simplified measurement pathway while maintaining accuracy.
2Measurement precision
If conventional methods are used to evaluate expansibility and free lime content, then measurement capability is achieved, but the time required for aging treatment determination increases
Solution Approach 1:
The patent replaces time-consuming wet chemical analysis and thermogravimetric measurements with rapid LIBS spectroscopy. The laser-based method provides immediate emission spectrum data that can be processed by the estimation model to determine free lime content and predict expansibility, reducing analysis time from hours to minutes while maintaining measurement precision.
3Reliability
If steelmaking slag is subjected to extended aging treatment to ensure expansion stability, then reliability of road construction material is improved, but productivity and manufacturing efficiency decrease
Solution Approach 1:
The patent implements a feedback mechanism where the estimation model continuously monitors free lime content and predicts expansibility. This feedback information allows for real-time adjustment of aging treatment duration, ensuring that slag receives only the necessary treatment time required to achieve target expansion stability, thereby optimizing both reliability and productivity.
Solution Approach 2:
The patent uses the estimation model to dynamically adjust aging treatment parameters based on measured free lime content and predicted expansibility. By changing the aging time parameter according to actual material properties rather than using fixed extended periods, the process achieves required reliability while improving manufacturing efficiency.
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
Enables simple, rapid, and highly accurate estimation of free lime content, allowing for optimized aging treatment and efficient management of steelmaking slag for road construction, reducing manufacturing costs and improving expansion stability.
Implementation Method 1
a step of acquiring an emission spectrum by irradiating steelmaking slag with a laser to convert a portion of a surface of the steelmaking slag into plasma and acquiring an emission spectrum from the plasma
Implementation Method 2
acquiring an emission spectrum from the plasma
Implementation Method 3
inputting intensities of an emission spectrum including peaks caused by emission lines of Ca, Fe, and Si
Data Source
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Figure 3
AI summary
Provided are a method for generating a free lime content estimation model for steelmaking slag, by which the free lime content of steelmaking slag can be estimated in a simple, rapid, and highly accurate manner, a method for estimating the free lime content of steelmaking slag, a method for managing shipment of steelmaking slag, and a method for manufacturing iron and steel slag for road construction. The method for estimating the free lime content of steelmaking slag includes: a step of acquiring an emission spectrum by irradiating steelmaking slag with a laser to convert a portion of a surface of the steelmaking slag into plasma and acquiring an emission spectrum from the plasma; and a step of estimating a free lime content by inputting intensities of an emission spectrum including peaks caused by emission lines of Ca, Fe, and Si, within the emission spectrum acquired in the step of acquiring the emission spectrum, into a free lime content estimation model, to output the free lime content of a steelmaking slag irradiated with the laser.