标准编号：ISO 16742:2014
中文名称：铁矿石 泥浆取样
英文名称：Iron ores — Sampling of slurries
发布日期：2014-03
标准范围
This International Standard sets out the basic methods for sampling fine iron ore of nominal topsize <1 mm that is mixed with water to form a slurry. At very high ratios of fine solids to water when thematerial assumes a soft plastic form (about 80 % solids depending on the particle size distribution of thesolids), the mixture is correctly termed a paste. Sampling of pastes is not covered in this InternationalStandard.The procedures described in this International Standard apply to sampling of iron ore that is transportedin moving streams as a slurry. These streams can fall freely or be confined in pipes, launders, chutes,spirals, or similar channels. Sampling of slurries in pressurized pipes is not covered in this InternationalStandard. The slurry stream can only be sampled satisfactorily at a transfer point prior to the pressurizedpipe at the end of the pipe when the slurry is no longer under pressure. In addition, sampling of slurriesin stationary situations, such as a settled or even a well-stirred slurry in a tank, holding vessel, or dam,is not recommended and is not covered in this International Standard.This International Standard describes procedures that are designed to provide samples representativeof the slurry solids and particle size distribution of the slurry under examination. After filtration of theslurry sample, damp samples of the contained solids in the slurry are available for drying (if required)and measurement of one or more characteristics in an unbiased manner and with a known degree ofprecision. The characteristics are measured by chemical analysis, physical testing, or both.The sampling methods described are applicable to slurries that require inspection to verify compliancewith product specifications, determination of the value of a characteristic as a basis for settlementbetween trading partners, or estimation of a set of average characteristics and variances that describea system or procedure.Provided flow rates are not too high, the reference method against which other sampling proceduresare compared is one where the entire stream is diverted into a vessel for a specified time or volumeinterval, ensuring that all parts of the stream are diverted into the vessel for the same period of time.This International Standard corresponds to the stopped-belt method described in ISO 3082. Referenceincrements have to be taken as close as possible to increments taken using the sampling procedureunder evaluation.
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