AS 2862.1:2021 pdf free download – Copper, lead, zinc and nickelconcentrates -Sampling Part 1: Sampling procedures for determination of metal and moisture content

AS 2862.1:2021 pdf free download – Copper, lead, zinc and nickelconcentrates -Sampling Part 1: Sampling procedures for determination of metal and moisture content.
This document sets out the basic methods for sampling copper, lead, zinc and nickel concentrates from moving streams and stationary lots, including stopped-belt sampling, to provide samples for chemical analysis, physical testing and determination of moisture content, in accordance with the relevant International Standards. Where the concentrates are susceptible to significant oxidation or decomposition, a common sample that is sufficiently representative. i.e. unbiased and sufficiently precise, is used for moisture determination and chemical analysis to eliminate bias (see ISO 10251). Any large agglomerates (>10 mm) present In the primary sample are crushed prior to further sample processing. Sampling of concentrates In slurry form is specilically excluded from this document.
Stopped.belt sampling Is the reference method for collecting concentrate samples against which mechanical and manual-sampling procedures can be compared. Sampling from moving streams is the preferred method. Both falling-stream and cross-belt samplers are described.
Sampling from stationary lots is used only where sampling from moving streams is not possible. The procedures described in this document for sampling from stationary lots only minimize some of the systematic sampling errors.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document For dated references, only the edition cited applies. For undated references, the l,itcst edition of the referenced document (including any amendments) applies.
ISO 10251, copper, lead, zincandnickel concentrates — Determination ofmass loss of bulk material on drying ISO 12744, Copper. lead, zinc and nickel concentrates — Experimental methods for checking the precision of sampling
ISO 13292, Copper, lead, zinc and nickel concentrates — Experimental methods for checking the bias ofsanipling
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardIzation at the following addresses:
— ISO Online browsing platform: available at httpsjlwww .or/obp
— I EC Electropedia: available at http://www.electropedia.org/
representative sample
quantity ol concentrate representing a larger mass of concentrate with both precision and bios (I2) within acceptable limits
For the determination of moisture content, it is recommended that a moisture subsample he constituted tor each sub-lot, This will not only reduce the total variance but will also minimize loss of moisture and hence bias.
7.2.6 Types of division
Two types of divisuri arc applicbIc to mass-basis sampling:
a) Constant-mass division, which is a method of obtaining divided increments, subsamples or lot samples with almost uniform mass, regardless of the variation in the masses to be divided. Cutter- type dividers with variable cutting frequencies can be used for this type of division (see 15.4.6).
b) Proportional division, which Is a method of obtaining divided increments. subsamples or lot samples with masses proportional to the varied masses to be divided. Rotary sample dividers can be used for this type of division (see 15.45).
Cutter-type dividers can lead to moisture loss, so are not recommended for division of moisture samples.
7.2.7 Division of increments
Where increments require division and subsamples or a lot sample are constituted from the divided increments, division shall be carried out as follows (see Table 4):
a) If the coefficient of variation of the Increment masses Is 20 % or less, either constant-mass or proportional division shall be used.
b) lithe coefficient of variation of the increment masses Is greater than 20%, division shall be carried out on an increment-by-increment basis using constant-mass division.
7.2.8 DIvision of subsamples
Where subsamples are divided and a lot sample is constituted from the divided subsamples, division shall be carried out as follows (see Table 4):
a) If the coefficient of variation of the subsample masses is 20% or less, and the subsamples consist of an equal number of increments, either constant-mass or proportional division shall be used.
b) If the coefficient of variation of the subsample masses is greater than 20 %, and the subsamples consist of an equal number of increments, constant-mass division shall be used.
c) If the subsamples consist of different numbers of increments, proportional division shall be used.