I. Introduction
Slag is generated at various stages of ironmaking and steelmaking, including blast furnaces, converters, basic oxygen furnaces, electric arc furnaces, and iron (steel) ladles. In blast furnace smelting, slag is primarily formed by the co-melting of gangue components from the ore, fluxes, and coke ash. Its chemical composition is complex, mainly consisting of oxides and sulfides of silicon, aluminum, calcium, and magnesium, along with small amounts of manganese and iron oxides. The composition of slag not only directly affects the control of smelting process parameters and the quality of the final product, but also serves as an important raw material for downstream industries such as cement and building materials. Therefore, rapid and accurate determination of the chemical composition of slag is of significant practical importance for optimizing smelting operations, strengthening quality control, and promoting the resource utilization of solid waste.
II. Application of XRF in Slag Composition Analysis
The major elements and oxides involved in slag composition analysis include SiO2, Al2O3, TFe (total iron), CaO, MgO, MnO, P2O5, TiO2, etc.
Traditional slag composition analysis has primarily relied on chemical wet methods. Although these methods offer satisfactory accuracy, they are characterized by cumbersome procedures, long analysis cycles, and the use of large quantities of acids and alkalis, resulting in severe environmental pollution. X-ray fluorescence spectrometry (XRF), with its advantages of simple sample preparation, simultaneous multi-element determination, and environmental friendliness, has become the mainstream method for slag composition analysis.
III. Analytical Case
Instrument: ScopeX CS Vacuum-type X-ray Fluorescence Spectrometer
Sample Preparation: Powder pressing method was adopted. The slag samples were ground to the specified particle size and then pressed into pellets with a smooth surface and uniform density under high pressure, ready for instrument analysis.
Test Results:
IV. Conclusion
This study demonstrates that the use of the ScopeX CS vacuum-type X-ray fluorescence spectrometer for the determination of solid slag composition is a reliable method with significant advantages. The instrument is equipped with a high-performance detector and a vacuum analysis system, which effectively eliminates the interference of air on light elements and significantly improves the detection limits and analytical accuracy for elements such as Na, Mg, Al, and Si. It simultaneously meets the requirements for rapid analysis of both major and minor elements in slag.
The ScopeX CS vacuum system exhibits excellent long-term stability and repeatability, with relative standard deviations (RSD) for major components better than 1%, providing reliable data support for smelting process control, quality monitoring, and slag resource utilization. This method is also applicable to the compositional analysis of similar samples, including metallurgical waste slag, refractory materials, and cement raw materials.