GB/T 44034-2024 Iron ores—Sampling of slurries

Scope

This document specifies the basic methods for sampling slurries formed by mixing iron ore powder with water, where the nominal maximum particle size is less than 1 mm. When the solid-to-water ratio is high, the material takes on a paste-like consistency (about 80% solid, depending on the particle size distribution of the solid). This type of mixture is specifically referred to as a paste, and the sampling of pastes is not covered in this document. The procedures described in this document apply to the sampling of iron ore transported in the form of slurries. These slurry flows may either fall freely or be contained in pipes, chutes, inclined chutes, or spiral pipes. This document does not address the sampling of slurries in pressurized pipes. Slurry flows can only be sampled satisfactorily at a conversion point before the end of the pressurized pipes, provided the slurry is no longer under pressure. Additionally, it is not recommended to sample static slurries (e.g., those settled or mixed evenly in tanks, containers, or dams), and this document does not cover such cases. This document describes procedures designed to provide representative samples that reflect the solid slurry and its particle size distribution to be tested. After filtering the slurry, the wet sample containing solids can be dried (if necessary) and used for chemical and physical measurements of one or more quality characteristics in an unbiased manner and with known accuracy. The sampling methods described in this document are suitable for slurries that require testing to verify compliance with product specifications, and the measurement results of their quality characteristics serve as the basis for settlements between trading partners or for estimating a set of average characteristics and variances to describe a system or process. If the flow rate is not too high, the reference method involves transferring the entire slurry flow to a container within a specified time or volume interv

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