--- title: A Fresh Look at Slag Analysis – From Granular Material to Result description: A new round robin test investigates how sample preparation impacts slag analysis accuracy across steel plants using granular ladle slag material. image: https://quantolux.de/hubfs/WhatsApp%20Bild%202025-07-23%20um%2009.49.30_3a65c9ee.jpg --- [Skip to content](https://quantolux.de/en/blog/a-fresh-look-at-slag-analysis-from-granular-material-to-result#main-content) [![Small_ql-logo_RGB2 - 250px-1](https://quantolux.de/hs-fs/hubfs/Small_ql-logo_RGB2%20-%20250px-1.png?width=360&height=72&name=Small_ql-logo_RGB2%20-%20250px-1.png)](https://quantolux.de/?hsLang=en) - [Home](https://quantolux.de/en/) - Products Show submenu for Products - [Product Overview](https://quantolux.de/en/products) - [AlloyChecker](https://quantolux.de/en/alloychecker) - [QLX1](https://quantolux.de/en/qlx1) - [QLX9](https://quantolux.de/en/qlx9) - [QLX 4.0 Software](https://quantolux.de/en/products-qlx-software) - [Case Studies](https://quantolux.de/en/case-studies) - [Contact](https://quantolux.de/en/contact) - [News](https://quantolux.de/en/blog) - [About](https://quantolux.de/en/about) Open main navigation Close main navigation - [Home](https://quantolux.de/en/) - Products Show submenu for Products - [Product Overview](https://quantolux.de/en/products) - [AlloyChecker](https://quantolux.de/en/alloychecker) - [QLX1](https://quantolux.de/en/qlx1) - [QLX9](https://quantolux.de/en/qlx9) - [QLX 4.0 Software](https://quantolux.de/en/products-qlx-software) - [Case Studies](https://quantolux.de/en/case-studies) - [Contact](https://quantolux.de/en/contact) - [News](https://quantolux.de/en/blog) - [About](https://quantolux.de/en/about) - [Contact us](https://quantolux.de/en/contact) [Contact us](https://quantolux.de/en/contact?hsLang=en) Jul 23, 2025 10:43:40 AM # A Fresh Look at Slag Analysis – From Granular Material to Result ![Picture of Alexander Schlemminger, CEO QuantoLux Innovation GmbH](https://quantolux.de/hs-fs/hubfs/Screenshot%202023-04-25%20075636.png?width=50&name=Screenshot%202023-04-25%20075636.png) [Alexander Schlemminger, CEO QuantoLux Innovation GmbH](https://quantolux.de/en/blog/author/alexander-schlemminger) Share: [facebook-f icon](http://www.facebook.com/share.php?u=https://quantolux.de/en/blog/a-fresh-look-at-slag-analysis-from-granular-material-to-result) [linkedin-in icon](http://www.linkedin.com/shareArticle?mini=true&url=https://quantolux.de/en/blog/a-fresh-look-at-slag-analysis-from-granular-material-to-result) [Twitter icon](https://twitter.com/intent/tweet?url=https://quantolux.de/en/blog/a-fresh-look-at-slag-analysis-from-granular-material-to-result) [pinterest-p icon](http://pinterest.com/pin/create/link/?url=https://quantolux.de/en/blog/a-fresh-look-at-slag-analysis-from-granular-material-to-result) [envelope icon](mailto:?body=https://quantolux.de/en/blog/a-fresh-look-at-slag-analysis-from-granular-material-to-result) ### Introduction Chemical analysis of slag is a crucial component of process optimization in steelmaking. But how reliable are analytical results when samples are not homogenized or pulverized beforehand? That’s the central question we at QuantoLux are investigating in a focused round robin test involving over ten steel plants — with a spotlight on **granular ladle slag**. The goal is to evaluate the **impact of sample preparation and analysis procedures** across different laboratories. In other words: *How much do results vary when identical slag material is prepared and analyzed independently by different labs using their own standard routines?* ![multiple subsets of 1 LF slag sample prepared for shipping in the round-robin test](https://14563635.fs1.hubspotusercontent-na1.net/hub/14563635/hubfs/WhatsApp%20Bild%202025-07-23%20um%2009.49.30_3a65c9ee.jpg?width=1200&length=1200&name=WhatsApp%20Bild%202025-07-23%20um%2009.49.30_3a65c9ee.jpg) multiple subsets of 1 LF slag sample prepared for shipping in the round-robin test ### Traditional Round Robin Tests – Efficient, but not made for "real-life" comparison Most round robin tests involving slag samples use **pre-homogenized and pulverized material** to ensure comparability. The aim is typically to benchmark **X-ray fluorescence (XRF)** performance under controlled lab conditions. While useful for evaluating instruments, these protocols deliberately **minimize the influence of sample preparation** — and in doing so, they **fail to reflect real-world challenges**. However, **Steelmaking Slag is inherently heterogeneous**. Minor differences in grinding, homogenization, or pellet pressing can lead to significant measurement variations — with direct consequences for melt shop decision-making and process control. ### A New Approach – Closer to Real-World Practice Our round robin takes a realistic and practice-oriented approach. Instead of sending pre-pulverized powders, we distribute **granular ladle slag material from a single batch — exactly as it appears thousands of times per day in routine steel plant operations.** Each participating plant analyzes the material using its **standard preparation and measurement procedures**, capturing the real-life variability that naturally arises in daily sample handling and analysis. To ensure transparency and provide reference data on sample homogeneity and baseline composition: - **Each sample is additionally analyzed using a QuantoLux Laser OES slag analyzer (QLX9).** This system performs **quasi-nondestructive, rapid measurements directly on the granular material**, offering a fast and consistent reference point for comparison. - **A selected subset of the samples is also analyzed by an accredited laboratory** using **fused bead preparation and XRF**, delivering high-precision certified reference values for benchmarking.   ### What We're Investigating This test setup enables us to finally quantify the **influence of sample preparation under realistic conditions**: - **How much do analytical results vary across different labs?** - **What is the estimated contribution of sample splitting, preparation, and sampling technique to total measurement error?** These are essential insights for any steel producer aiming to optimize not only the slag analysis process, but also **the broader operational workflow** surrounding slag utilization and process feedback. ### Laser OES – A Potential Gamechanger? Modern technologies such as **Laser Optical Emission Spectroscopy (Laser OES)** offer the potential to **dramatically reduce sample preparation time** while preserving analytical precision. With Laser OES, **heterogeneous materials like slag can be analyzed in under one minute** — without grinding, pressing, or fusing — and directly on the shop floor. This opens the door for **real-time, process-integrated slag monitoring** that supports more agile and efficient steelmaking operations.   ### Conclusion This round robin test is the first to place slag analysis into a **real-world context**, evaluating how much of the total analytical variation stems from sample handling and preparation rather than instrumentation alone. We’re excited to work with our steel industry partners on this journey — because understanding your sample better means **controlling your process smarter**.   [QLX9](https://quantolux.de/en/blog/tag/qlx9), [rapid slag](https://quantolux.de/en/blog/tag/rapid-slag), [LIBS](https://quantolux.de/en/blog/tag/libs), [slag analysis](https://quantolux.de/en/blog/tag/slag-analysis), [OES slag analysis](https://quantolux.de/en/blog/tag/oes-slag-analysis) ## Related posts [![slag analysis training in minutes, not hours](https://quantolux.de/hs-fs/hubfs/Screenshot%202026-01-16%20092804.png?height=200&name=Screenshot%202026-01-16%20092804.png)](https://quantolux.de/en/blog/eight-months-in-operation-chinas-first-oes-slag-analyzer-for-bof-lf?hsLang=en) [QLX9](https://quantolux.de/en/blog/tag/qlx9), [rapid slag](https://quantolux.de/en/blog/tag/rapid-slag), [LIBS](https://quantolux.de/en/blog/tag/libs), [Commissioning](https://quantolux.de/en/blog/tag/commissioning), [slag analysis](https://quantolux.de/en/blog/tag/slag-analysis), [OES slag analysis](https://quantolux.de/en/blog/tag/oes-slag-analysis), [XRF](https://quantolux.de/en/blog/tag/xrf) ## [8 Months in Operation: China’s First OES Slag Analyzer for BOF/LF](https://quantolux.de/en/blog/eight-months-in-operation-chinas-first-oes-slag-analyzer-for-bof-lf?hsLang=en) ![Picture of Alexander Schlemminger, CEO QuantoLux Innovation GmbH](https://quantolux.de/hs-fs/hubfs/Screenshot%202023-04-25%20075636.png?width=50&name=Screenshot%202023-04-25%20075636.png) [Alexander Schlemminger, CEO QuantoLux Innovation GmbH](https://quantolux.de/en/blog/author/alexander-schlemminger) Jan 16, 2026 10:39:24 AM Reducing slag analysis time from 15 minutes to just 1 minute can fundamentally change BOF process... [Read more](https://quantolux.de/en/blog/eight-months-in-operation-chinas-first-oes-slag-analyzer-for-bof-lf?hsLang=en) [![EAF sampling](https://quantolux.de/hs-fs/hubfs/AdobeStock_647667601-jpeg.jpeg?height=200&name=AdobeStock_647667601-jpeg.jpeg)](https://quantolux.de/en/blog/meeting-notes-why-xrf-slag-analysis-is-the-future?hsLang=en) [QLX9](https://quantolux.de/en/blog/tag/qlx9), [rapid slag](https://quantolux.de/en/blog/tag/rapid-slag), [LIBS](https://quantolux.de/en/blog/tag/libs), [slag analysis](https://quantolux.de/en/blog/tag/slag-analysis), [XRF](https://quantolux.de/en/blog/tag/xrf) ## [Case-Closed. Meeting notes from a meltshop.](https://quantolux.de/en/blog/meeting-notes-why-xrf-slag-analysis-is-the-future?hsLang=en) ![Picture of Alexander Schlemminger, CEO QuantoLux Innovation GmbH](https://quantolux.de/hs-fs/hubfs/Screenshot%202023-04-25%20075636.png?width=50&name=Screenshot%202023-04-25%20075636.png) [Alexander Schlemminger, CEO QuantoLux Innovation GmbH](https://quantolux.de/en/blog/author/alexander-schlemminger) May 19, 2026 12:24:37 PM Nothing needs to change. Note: The meeting described below is fictional. The characters, quotes,... [Read more](https://quantolux.de/en/blog/meeting-notes-why-xrf-slag-analysis-is-the-future?hsLang=en) [![A QLX9 heavy duty ready for packaging and shipment in the evening time](https://quantolux.de/hs-fs/hubfs/WhatsApp%20Bild%202024-12-26%20um%2016.21.16_2d9b1729-1.jpg?height=200&name=WhatsApp%20Bild%202024-12-26%20um%2016.21.16_2d9b1729-1.jpg)](https://quantolux.de/en/blog/next-level-secondary-metallurgy-for-turkish-customer?hsLang=en) [QLX9](https://quantolux.de/en/blog/tag/qlx9), [rapid slag](https://quantolux.de/en/blog/tag/rapid-slag), [Commissioning](https://quantolux.de/en/blog/tag/commissioning), [slag analysis](https://quantolux.de/en/blog/tag/slag-analysis), [OES slag analysis](https://quantolux.de/en/blog/tag/oes-slag-analysis), [XRF](https://quantolux.de/en/blog/tag/xrf) ## [Next-Level Secondary Metallurgy for Turkish Customer](https://quantolux.de/en/blog/next-level-secondary-metallurgy-for-turkish-customer?hsLang=en) ![Picture of Alexander Schlemminger, CEO QuantoLux Innovation GmbH](https://quantolux.de/hs-fs/hubfs/Screenshot%202023-04-25%20075636.png?width=50&name=Screenshot%202023-04-25%20075636.png) [Alexander Schlemminger, CEO QuantoLux Innovation GmbH](https://quantolux.de/en/blog/author/alexander-schlemminger) Dec 26, 2024 4:34:46 PM December 2024 - A new QLX9 HD analyzer is en route to a customer in Turkey, where it will be... 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