ISO 11794:2017
Copper, lead, zinc and nickel concentrates - Sampling of slurries

Standard No.

ISO 11794:2017

Release Date

2017

Published By

International Organization for Standardization (ISO)

Latest

ISO 11794:2017

Scope

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.

ISO 11794:2017 Referenced Document

• ISO 11790:2010 Copper, lead, zinc and nickel concentrates - Guidelines for the inspection of mechanical sampling systems
• ISO 12743:2006 Copper, lead, zinc and nickel concentrates - Sampling procedures for determination of metal and moisture content
• ISO 12744:2006 Copper, lead, zinc and nickel concentrates - Experimental methods for checking the precision of sampling
• ISO 13292:2006 Copper, lead, zinc and nickel concentrates - Experimental methods for checking the bias of sampling
• ISO 3534-1:1993 Statistics; vocabulary and symbols; part 1: probability and general statistical terms

ISO 11794:2017 history

• 2017 ISO 11794:2017 Copper, lead, zinc and nickel concentrates - Sampling of slurries
• 2010 ISO 11794:2010 Copper, lead, zinc and nickel concentrates - Sampling of slurries