GB/T 25945-2010 PDF English
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GB/T 25945-2010: Aluminium ores -- Sampling procedures
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT25945-2010GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 73.060.40 H 30 GB/T 25945-2010 / ISO 8685.1992 Aluminium ores -- Sampling procedures 铝土矿 取样程序 (ISO 8685.1992, IDT) Issued on: DECEMBER 23, 2010 Implemented on: SEPTEMBER 01, 2011 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 5 4 Establishing a sampling scheme... 7 5 Number of primary increments and sampling units... 12 6 Mass of gross samples and subsamples... 15 7 Mass of increment... 19 8 Mass-basis sampling... 20 9 Time-basis sampling... 24 10 Stratified random sampling at fixed mass or time intervals... 26 11 Mechanical sampling from moving streams... 27 12 Manual sampling from moving streams... 31 13 Stopped-belt sampling... 33 14 Sampling from stationary situations... 34 15 Packing and marking of samples... 38 Annex A (informative) Derivation of equation for minimum gross sample mass... 39 Annex B (informative) Mechanical sampling devices... 41 Annex C (informative) Manual sampling implement... 43 Annex D (informative) Manual sampling implements from stationary situations... 44Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard uses translation method to identically adopt ISO 8685.1992 "Aluminium ores -- Sampling procedures". Annex A, Annex B, Annex C, and Annex D of this Standard are informative. This Standard shall be under the jurisdiction of National Technical Committee on Non- ferrous Metals of Standardization Administration of China (SAC/TC 243). The drafting organizations of this Standard. Aluminum Corporation of China Shandong Branch, China Nonferrous Metals Industry Standard Calculation Quality Research Institute. Main drafters of this Standard. Wang Zhaowen, Li Linhai, Shao Jing, An Kun, Pei Cunyan, Yang Kaiguo, Li Hong. Aluminium ores -- Sampling procedures1 Scope
This Standard sets out requirements for the sampling of aluminium ores from moving streams and stationary situations, including slopped-belt sampling, to provide gross samples for sample preparation. Stopped-belt sampling is the reference method for collecting ore samples against which other sampling procedures may be compared. Sampling from moving streams is the preferred method. Sampling from stationary situations should only be considered when sampling from moving streams is not possible. The procedures described in this Standard for sampling from stationary situations merely minimize some of the sampling errors. Although this Standard is intended to cover all aluminium ore sampling from moving streams. the procedures recommended may not be applicable in cases of extreme segregation. For example, very wet ore due to its sticky nature. or very dry ore due to generation of dust. In such cases it may be necessary to revert to stopped-belt sampling.2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 3358.1, Statistics -- Vocabulary and symbols -- Part 1.General statistical terms and terms used in probability GB/T 25943-2010, Aluminium ores -- Experimental methods for checking the precision of sampling (ISO 10277.1995, IDT) GB/T 25944-2010, Aluminium ores -- Experimental determination of the heterogeneity of distribution of a lot (ISO 6139.1993, IDT) GB/ T 25946-2010, Aluminium ores -- Experimental methods for checking the bias of sampling (ISO 10226.1991, IDT) GB/T 25947-2010, Aluminium ores -- Determination of the moisture content of bulk material (ISO 9033.1989, IDT) GB/T 25949-2010, Aluminium ores -- Preparation of samples (ISO 6140.1991, IDT) GB/ T 25950-2010, Aluminium ores -- Experimental determination of the heterogeneity of constitution (ISO 6138.1991, IDT) ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
