Overview
ISO 9516-1:2003 - "Iron ores - Determination of various elements by X‑ray fluorescence spectrometry - Part 1: Comprehensive procedure" defines a wavelength‑dispersive X‑ray fluorescence (WDXRF) method for multi‑element analysis of iron ores. The procedure specifies preparation of fused borate glass discs, calibration with synthetic standards and matrix corrections to determine Fe, Si, Ca, Mn, Al, Ti, Mg, P, S, K, Sn, V, Cr, Co, Ni, Cu, Zn, As, Pb, Ba and others. The method is applicable to iron ores regardless of mineralogical type and is designed to cope with ores having high ignition losses.
Key topics and technical requirements
- Measurement principle: Wavelength‑dispersive XRF using the “line‑only” approach and background equivalent concentrations (BEC) for line overlap corrections.
- Sample preparation: Fusion of the test portion into borate glass discs (eliminates particle‑size effects); sodium nitrate added to ensure complete oxidation.
- Flux options: Three flux formulations (Flux A, B, C) are specified (lithium or sodium borates); note that use of some fluxes affects sulfur reporting.
- Calibration: Two independent batches of a synthetic calibration standard are prepared; calibration is based on pure chemicals and requires matrix inter‑element corrections.
- Quality and precision: Annexes include procedures for disc preparation, spectrometer precision tests, dead‑time determination, standard deviation of specimen preparation and acceptance flowcharts.
- Reagents and apparatus: High‑purity reagents, platinum crucibles/moulds and balances to four decimal places are specified; detailed preparation and drying/ignition treatments for reagents are given.
- Scope limits: The standard provides concentration ranges for each element (e.g., Fe ~38–72% for referee purposes; Si ~0.2–6.5%) and indicates which determinations are suitable for referee vs routine use.
- Safety: The document highlights hazards from reagents, high temperatures and X‑ray equipment and advises appropriate health and safety practices.
Applications and users
ISO 9516-1:2003 is intended for:
- Analytical laboratories performing iron ore chemical analysis (QA/QC and referee laboratories)
- Mining and beneficiation operations needing reliable multi‑element assays for product specification, blending and process control
- Steelmakers and raw‑material procurers requiring certified compositional data for charge materials
- Regulatory bodies and standardization committees that reference harmonized test methods
Practical benefits include minimized particle‑size bias, robust calibration for inter‑element effects, and applicability across diverse ore types - useful when accurate multi‑element assays are needed quickly and reproducibly.
Related standards
- ISO 9516-2 (Part 2: Simplified procedure) - routine analysis
- ISO 3082 - Sampling and sample preparation procedures for iron ores
- ISO 7764 - Preparation of predried test samples for chemical analysis
Keywords: ISO 9516-1:2003, iron ores, WDXRF, XRF spectrometry, fused glass discs, calibration standard, flux, sample preparation, mining QA/QC.
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