BS ISO 11794:2017
$198.66
Copper, lead, zinc and nickel concentrates. Sampling of slurries
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 52 |
This document sets out the basic methods for sampling particulate material that is mixed with a liquid, usually water, to form a slurry. In industry and in the mining and mineral processing literature, slurry is also referred to as pulp, but this term is not used in this document. At very high ratios of fine particulate solids to liquids where material assumes a soft plastic form, the mixture is correctly termed as a paste. Sampling of pastes is not covered in this document.
The procedures described in this document apply to sampling of particulate materials that are transported in moving streams as slurries, but not pressurized slurries. These streams may fall freely or be confined in pipes, launders, flumes, sluices, spirals or similar channels. Sampling of slurries in stationary situations, such as a settled or even a well-stirred slurry in a holding vessel or dam, is not recommended and is not covered in this document.
This document describes procedures that are designed to provide samples representative of the slurry solids and particle-size distribution of the slurry under examination. After draining the slurry sample of fluid and measuring the fluid volume, damp samples of the contained particulate material 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 describes a system or procedure.
Provided that 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. This method corresponds to the stopped-belt method described in ISO 12743.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 7 | Foreword |
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions 4 Principles of sampling slurries 4.1 General |
| 11 | 4.2 Sampling errors 4.2.1 General |
| 12 | 4.2.2 Preparation error, PE 4.2.3 Delimitation and extraction errors, DE and EE |
| 14 | 4.2.4 Weighting error, WE 4.2.5 Periodic quality-fluctuation error, QE3 4.3 Sampling and total variance 4.3.1 Sampling variance 4.3.2 Total variance |
| 16 | 4.3.3 Sampling-stage method of estimating sampling and total variance |
| 17 | 4.3.4 Simplified method of estimating sampling and total variance |
| 18 | 4.3.5 Interleaved sample method of measuring total variance |
| 19 | 5 Establishing a sampling scheme |
| 24 | 6 Minimization of bias and unbiased increment mass 6.1 Minimization of bias |
| 25 | 6.2 Volume of increment for falling-stream samplers to avoid bias 7 Number of increments 7.1 General |
| 26 | 7.2 Simplified method 8 Minimum mass of solids contained in lot and sub-lot samples 8.1 Minimum mass of solids in lot samples 8.2 Minimum mass of solids in sub-lot samples 8.3 Minimum mass of solids in lot and sub-lot samples after size reduction |
| 27 | 9 Time-basis sampling 9.1 General 9.2 Sampling interval 9.3 Cutters 9.4 Taking of increments 9.5 Constitution of lot or sub-lot samples |
| 28 | 9.6 Division of increments and sub-lot samples 9.7 Division of lot samples 9.8 Number of cuts for division 10 Stratified random sampling within fixed time intervals |
| 29 | 11 Mechanical sampling from moving streams 11.1 General 11.2 Design of the sampling system 11.2.1 Safety of operators 11.2.2 Location of sample cutters 11.2.3 Provision for duplicate sampling 11.2.4 System for checking the precision and bias 11.2.5 Avoiding bias |
| 30 | 11.3 Slurry sample cutters 11.3.1 General 11.3.2 Falling-stream cutters |
| 31 | 11.3.3 Cutter velocities 11.4 Mass of solids in increments 11.5 Number of primary increments 11.6 Routine checking 12 Manual sampling from moving streams 12.1 General |
| 32 | 12.2 Choosing the sampling location 12.3 Sampling implements |
| 33 | 12.4 Mass of solids in increments 12.5 Number of primary increments 12.6 Sampling procedures 13 Sampling of stationary slurries 14 Sample preparation 14.1 General 14.2 Sample division |
| 34 | 14.3 Sample grinding 14.4 Chemical analysis samples 14.5 Physical test samples 15 Packing and marking of samples |
| 35 | Annex A (normative) Sampling-stage method for estimating sampling and total variance |
| 42 | Annex B (informative) Examples of correct slurry sampling devices |
| 45 | Annex C (informative) Examples of incorrect slurry sampling devices |
| 49 | Annex D (normative) Manual sampling implements |
| 50 | Bibliography |
