BS ISO 16742:2014:2016 Edition
$167.15
Iron ores. Sampling of slurries
| Published By | Publication Date | Number of Pages |
| BSI | 2016 | 40 |
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.
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.
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.
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.
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | Foreword |
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions 4 General considerations for sampling slurries 4.1 Basic requirements |
| 11 | 4.2 Sampling errors |
| 12 | 4.3 Establishing a sampling scheme |
| 14 | 5 Fundamentals of sampling and sample preparation 5.1 Minimization of bias |
| 15 | 5.2 Volume of increment for falling stream samplers to avoid bias 5.2.1 Linear cross-stream cutter |
| 16 | 5.2.2 Vezin cutter 5.3 Volume of increment for manual sampling to avoid bias |
| 17 | 5.4 Overall precision |
| 18 | 5.5 Quality variation |
| 19 | 5.6 Sampling precision and number of primary increments 5.7 Precision of sample preparation and overall precision |
| 20 | 6 Minimum mass of solids in gross and partial samples 6.1 General 6.2 Minimum mass of solids in gross samples |
| 21 | 6.3 Minimum mass of solids in partial samples 7 Time-basis sampling 7.1 General 7.2 Sampling interval 7.3 Cutters |
| 22 | 7.4 Taking of increments 7.5 Constitution of gross or partial samples 7.6 Division of increments and partial samples 7.7 Division of gross samples 7.8 Number of cuts for division 8 Stratified random sampling within fixed time intervals |
| 23 | 9 Mechanical sampling from moving streams 9.1 General 9.2 Design of the sampling system 9.2.1 Safety of operators 9.2.2 Location of sample cutters 9.2.3 Provision for duplicate sampling 9.2.4 System for checking the precision and bias |
| 24 | 9.2.5 Minimizing bias 9.3 Slurry sample cutters 9.3.1 General |
| 25 | 9.3.2 Falling-stream cutters 9.3.3 Cutter velocities 9.4 Mass of solids in increments 9.5 Number of primary increments |
| 26 | 9.6 Routine checking 10 Manual sampling from moving streams 10.1 General 10.2 Choosing the sampling location 10.3 Sampling implements 10.4 Volume of increments |
| 27 | 10.5 Number of primary increments 10.6 Sampling procedures 11 Sampling of stationary slurries |
| 28 | 12 Sample preparation procedures 12.1 General 12.2 Grinding mills 12.3 Sample division 12.4 Chemical analysis samples 12.5 Physical test samples 13 Packing and marking of samples |
| 30 | Annex A (informative) Examples of correct slurry sampling devices |
| 33 | Annex B (informative) Examples of incorrect slurry sampling devices |
| 36 | Annex C (normative) Manual sampling implements |
| 37 | Bibliography |
