Overview
ISO 10835:2007 - "Direct reduced iron and hot briquetted iron - Sampling and sample preparation" defines the theory, principles and basic requirements for sampling and preparing samples of Direct Reduced Iron (DRI) and Hot Briquetted Iron (HBI). The standard covers mechanical and manual sampling methods for lots under transfer (loading/discharging), and procedures to obtain representative samples for determining chemical composition, moisture content and physical properties. It applies to sampling from belt conveyors and other ore-handling equipment and includes DRI in the form of reduced pellets and reduced lump ore.
Note on safety: the standard warns that DRI/HBI can react with air or water (producing heat and hydrogen), so appropriate safety measures are required.
Key topics and technical requirements
- Fundamentals of sampling: principles to minimize bias, control particle-size degradation and ensure representative increments.
- Sampling schemes: mass-basis, time-basis and stratified random sampling methods, with guidance on increment mass, sampling interval and number of primary increments.
- Sampling from moving streams: location, design and operation of primary samplers, cutter design (aperture and speed), and stopped-belt reference sampling.
- Sampling system design: requirements for installation, robustness, versatility, safety, and on-line sample preparation equipment.
- Sample preparation: crushing, grinding, mixing, mechanical and manual division (including riffle dividers), and procedures to prepare test samples for moisture, physical testing and chemical analysis (preparation to –250 µm and –160 µm sizes are discussed).
- Quality assurance: system verification, checking precision and bias, maintenance and inspection of sampling systems.
- Ancillary equipment: crushers, dividers, dryers and flow-sheets for practical sampling operations.
Practical applications
ISO 10835:2007 is used to ensure representative sampling and reliable test results in supply chain, commercial and quality-control contexts:
- Steel mills and ironmakers ensuring accurate feedstock chemistry and moisture control for process stability.
- Iron ore processors, HBI/DRI producers and pellet plants validating product quality during loading and discharge.
- Ports, terminals and logistics operators performing inspection sampling during transfer.
- Analytical laboratories and QA/QC teams preparing samples for chemical and physical testing.
- Equipment manufacturers and sampling system designers building compliant mechanical samplers and dividers.
Related standards
Relevant cross-references and normative documents cited in ISO 10835:2007 include:
Keywords: ISO 10835:2007, Direct Reduced Iron, Hot Briquetted Iron, DRI, HBI, sampling, sample preparation, mechanical sampling, stopped-belt sampling, riffle divider, moisture determination.