This International Standard sets out the basic methods for sampling fine iron ore of nominal top size <1 mm that is mixed with water to form a slurry. At very high ratios of fine solids to water when the material assumes a soft plastic form (about 80 % solids depending on the particle size distribution of the solids), the mixture is correctly termed a paste. Sampling of pastes is not covered in this International Standard.<\/p>\n
The procedures described in this International Standard apply to sampling of iron ore that is transported in 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 International Standard. The slurry stream can only be sampled satisfactorily at a transfer point prior to the pressurized pipe at the end of the pipe when the slurry is no longer under pressure. In addition, sampling of slurries in 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.<\/p>\n
This International Standard describes procedures that are designed to provide samples representative of the slurry solids and particle size distribution of the slurry under examination. After filtration of the slurry 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 of precision. The characteristics are measured by chemical analysis, physical testing, or both.<\/p>\n
The sampling methods described are applicable to slurries that require inspection to verify compliance with product specifications, determination of the value of a characteristic as a basis for settlement between trading partners, or estimation of a set of average characteristics and variances that describe a system or procedure.<\/p>\n
Provided flow rates are not too high, the reference method against which other sampling procedures are compared is one where the entire stream is diverted into a vessel for a specified time or volume interval, 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. Reference increments have to be taken as close as possible to increments taken using the sampling procedure under evaluation.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 7<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1\tScope 2\tNormative references <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 3\tTerms and definitions 4\tGeneral considerations for sampling slurries 4.1\tBasic requirements <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4.2\tSampling errors <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.3\tEstablishing a sampling scheme <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5\tFundamentals of sampling and sample preparation 5.1\tMinimization of bias <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5.2\tVolume of increment for falling stream samplers to avoid bias 5.2.1\tLinear cross-stream cutter <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.2.2\tVezin cutter 5.3\tVolume of increment for manual sampling to avoid bias <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.4\tOverall precision <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.5\tQuality variation <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.6\tSampling precision and number of primary increments 5.7\tPrecision of sample preparation and overall precision <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 6\tMinimum mass of solids in gross and partial samples 6.1\tGeneral 6.2\tMinimum mass of solids in gross samples <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 6.3\tMinimum mass of solids in partial samples 7\tTime-basis sampling 7.1\tGeneral 7.2\tSampling interval 7.3\tCutters <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 7.4\tTaking of increments 7.5\tConstitution of gross or partial samples 7.6\tDivision of increments and partial samples 7.7\tDivision of gross samples 7.8\tNumber of cuts for division 8\tStratified random sampling within fixed time intervals <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 9\tMechanical sampling from moving streams 9.1\tGeneral 9.2\tDesign of the sampling system 9.2.1\tSafety of operators 9.2.2\tLocation of sample cutters 9.2.3\tProvision for duplicate sampling 9.2.4\tSystem for checking the precision and bias <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 9.2.5\tMinimizing bias 9.3\tSlurry sample cutters 9.3.1\tGeneral <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 9.3.2\tFalling-stream cutters 9.3.3\tCutter velocities 9.4\tMass of solids in increments 9.5\tNumber of primary increments <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 9.6\tRoutine checking 10\tManual sampling from moving streams 10.1\tGeneral 10.2\tChoosing the sampling location 10.3\tSampling implements 10.4\tVolume of increments <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 10.5\tNumber of primary increments 10.6\tSampling procedures 11\tSampling of stationary slurries <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 12\tSample preparation procedures 12.1\tGeneral 12.2\tGrinding mills 12.3\tSample division 12.4\tChemical analysis samples 12.5\tPhysical test samples 13\tPacking and marking of samples <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Annex\u00a0A (informative) Examples of correct slurry sampling devices <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Annex\u00a0B (informative) Examples of incorrect slurry sampling devices <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Annex\u00a0C (normative) Manual sampling implements <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Iron ores. Sampling of slurries<\/b><\/p>\n |