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GB/T 10322.7-2016 English PDF (GBT10322.7-2016)

GB/T 10322.7-2016 English PDF (GBT10322.7-2016)

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GB/T 10322.7-2016: Iron ores and direct reduced iron -- Determination of size distribution by sieving

GB/T 10322.7-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.060.10
D 31
GB/T 10322.7-2016 / ISO 4701:2008
Replacing GB/T 10322.7-2004
Iron ores and direct reduced iron - Determination of
size distribution by sieving
(ISO 4701:2008, IDT)
ISSUED ON: DECEMBER 30, 2016
IMPLEMENTED ON: SEPTEMBER 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 9
2 Normative references ... 9
3 Terms and definitions ... 10
4 Principles and planning ... 10
5 Apparatus ... 17
6 Samples ... 20
7 Procedures ... 21
8 Verification ... 30
9 Results ... 30
10 Test report and working log ... 33
11 Precision ... 33
Annex A (Informative) Steps for establishing the operating conditions for the determination of size distribution using a single sieve or a nest of sieves ... 35 Annex B (Normative) Scheme of sample preparation and sieving procedure 36 Annex C (Normative) Maximum mass to be retained on a sieve at completion of batch sieving (m) in order to obtain good sieving efficiency ... 37 Annex D (Informative) Size apertures in R20 and R40/3 series ... 38
Annex E (Informative) Typical batch sieving apparatus ... 39
Annex F (Informative) Desirable features of mechanical sieving machines ... 40 Annex G (Normative) Procedure for determining the minimum mass of sample used for sieving ... 44
Annex H (Normative) Flowsheet of the procedure for the acceptance of
analytical values for test portions ... 48
Annex I (Informative) Explanation ... 49
Annex J (Normative) Determination of the average particle size (APS) ... 51 Foreword
GB/T 10322 "Iron ores" is divided into 8 parts:
- Part 1: Iron ores - Sampling and sample preparation procedures;
- Part 2: Iron ores - Experimental methods for evaluation of quality variation; - Part 3: Iron ores - Experimental methods for checking the precision of sampling;
- Part 4: Iron ores - Experimental methods for checking the bias of sampling; - Part 5: Iron ores - Determination of the moisture content of a lot;
- Part 6: Iron ore - Determination of decrepitation index;
- Part 7: Iron ores and direct reduced iron - Determination of size distribution by sieving;
- Part 8: Iron ores - Single-point determination of specific surface area - Nitrogen adsorption method.
This Part is Part 7 of GB/T 10322.
This Part is drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 10322.7-2004 "Iron ore - Determination of size
distribution by sieving". Compared with GB/T 10322.7-2004, in addition to editorial changes, the main technical changes of this Part are as follows: - Add direct reduced iron to the scope of application; so change the standard name to "Iron ores and direct reduced iron - Determination of size
distribution by sieving".
- In Clause 1 Scope, change the previous "This Standard specifies the
methods to be employed for determination of size distributions by sieving of iron ore, utilizing sieves having aperture sizes of 36 μm or larger. The size distribution is expressed in terms of mass and percentage mass,
passed or retained on selected sieves. The purpose of this Standard is to provide a basis for any testing of iron ore involving size determination for use by contracting parties in the sale and purchase of these materials" TO "This Part of GB/T 10322 specifies the methods to be employed for
determination of size distributions of iron ore and direct reduced iron. This Part applies to the determination of size distributions of iron ore and direct reduced iron, utilizing sieves having aperture sizes of 36 μm or larger". - Change the previous Clause 4"Principles and scheme" to "Principles and planning".
- Supplement the ground state requirements for test samples that "The
determination of size distribution of iron ores and direct reduced iron (DRI) may be carried out on a ‘dry’ or ‘natural’ (or ‘as-received’) basis" to the 4.1 “General”.
- Simplify the content of 4.3.1 Effect of moisture content; change to "When it is difficult to conduct sample division due to sample being adhesive or excessively wet, the sample shall be dried to constant mass in accordance with 7.1".
- In 4.3.2, change "For brittle iron ore during particle size analysis, the deviation check between mechanical sieving and hand sieving shall be
carried out according to the procedure given in GB/T 10322.4-2000 (see
5.2)" TO "There are differences in degradation of ores. Certain iron ores, particularly lump ore, and DRI may be subject to significant degradation during the sampling and size analysis sequences. Furthermore, different sampling and size analysis processes can cause degradation of ores and
DRI to different extents. Consequently this may lead to significant variation in results for the same lot. It is therefore essential that any degradation should be minimized through the correct design of manual sampling,
mechanical sampling and size analysis systems. Sampling systems should
be designed in accordance with the guidelines set out in ISO 3082 and ISO 10835".
- In subclause 4.3.3, change "For iron ores with pronounced magnetic
properties, demagnetization of the size sample shall be carried out" TO "For iron ores with pronounced magnetic properties and DRI that has been
handled by magnets, it is desirable to ensure that the size sample be
demagnetized or that the sieves are non-magnetic".
- In subclause 4.4, change "Sampling methods for iron ore (GB/T 10322.1) will generally provide number of samples in excess of the sieving
requirements" TO "Iron ore and DRI are prepared according to ISO 3082
and ISO 10835 for the number of samples required for sieving, respectively". - Change the previous 4.5 "Choice of dry and wet sieving" to "Choice of sieving method".
- Change the content in subclause 4.5.1 to "Two different sieving methods are available to perform particle size analysis (see Annex I): a) dry sieving, i.e. sieving without the application of water; b) wet sieving, i.e. sieving with a sufficient application of water to ensure the passage of undersize particles through the sieve apertures. A table summarizing the sample preparation and sieving procedure is given in Annex B".
- In subclause 4.5.2, change "The choice of sieving method for each part of a size determination shall be made on the basis of attaining the defined precision of testing (see 11.1). Details on the procedure shall be recorded in the working log" TO "The results of these methods may not be the same. No specific preference is given in this Part for either method when sieving iron ore samples. For DRI, dry sieving is recommended".
- In subclause 4.5.3, change "If a combination of any of the sieving methods is employed for different parts of the same overall size distribution, the changeover from dry to wet sieving shall be clearly indicated on the report sheet (see Clause 10)" TO "The choice of sieving method (see 4.5.5) for each part of a size determination shall be made on the basis of attaining the defined precision of testing (see 11.1). Details on the procedure shall be recorded in the working log".
- Change the content of 4.7.1 "General" to "The loading of a sieve or nest of sieves or continuous sieving machine shall be limited as prescribed in 4.7.2 and 4.7.3 and requires previous information about the size distribution of the sample to be sieved".
- The previous 4.7.2 corresponds to 4.7.2.1. And change "The maximum
mass retained shall not exceed the values tabulated in Annex A or as
determined in 4.7.2.1 or 4.7.2.2" TO "The maximum mass retained shall not exceed the values tabulated in Annex C or as determined in 4.7.2.2 or
4.7.2.3".
- Change the previous "4.7.2.1 Apertures ≥ 500 μm" TO "4.7.2.2 Apertures ≥ 4 mm"; supplement the bulk density of the sample and measure it according to ISO 3852.
- Change the previous "4.7.2.2 Apertures < 500 μm" TO "4.7.2.3 Apertures < 4 mm"; change "the maximum mass of sample retained shall not exceed 2
times the allowable maximum retention mass listed in Annex A" TO "the
maximum mass of sample retained shall be as given in Annex C".
- Delete "hand sieving time" from Table 2.
- Change the previous 6.2 "Acquisition of test sample(s) for division and sieving" to "Mass of test sample(s) for sieving".
- Supplement "Table 3 Comparison of overall sizing precision, βSPM, with the precisions of sampling, βS, and sample preparation and measurement, βPM" to the subclause 6.2.2.
Iron ores and direct reduced iron - Determination of
size distribution by sieving
1 Scope
This Part of GB/T 10322 specifies the methods to be employed for
determination of size distributions of iron ore and direct reduced iron. This Part applies to the determination of size distributions of iron ore and direct reduced iron, utilizing sieves having aperture sizes of 36 μm or larger. 2 Normative references
The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.
ISO 565 Test sieves - Metal wire cloth, perforated metal plate and
electroformed sheet - Nominal sizes of openings
ISO 2591-1 Test sieving - Part 1: Methods using test sieves of woven wire cloth and perforated metal plate
ISO 3082 Iron ores - Sampling and sample preparation procedures
ISO 3085 Iron ores - Experimental methods for checking the precision of sampling, sample preparation and measurement
ISO 3086 Iron ores - Experimental methods for checking the bias of sampling ISO 3087 Iron ores - Determination of moisture content of a lot
ISO 3310-1 Test sieves - Technical requirements and testing - Part 1: Test sieves of metal wire cloth
ISO 3310-2 Test sieves - Technical requirements and testing - Part 2: Test sieves of perforated metal plate
ISO 3852 Iron ores for blast furnace and direct reduction feedstocks -
Determination of bulk density
ISO 10835 Direct reduced iron and hot briquetted iron - Sampling and
sample preparation
ISO 11323 Iron ores and direct reduced iron - Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11323 apply.
4 Principles and planning
4.1 General
The determination of size distribution of iron ores and direct reduced iron (DRI) may be carried out on a “dry” or “natural” (or “as-received”) basis. Before a particle size determination is carried out, it is necessary to plan the entire sequence of procedures to be followed.
The basis for determination (dry or natural) and the sequence of procedures will depend on:
a) the purpose of the size analysis;
b) the properties of the iron ore and DRI to be evaluated;
c) the form in which the iron ore and DRI is received, e.g. gross sample, increments or partial samples;
d) the apparatus available.
A typical decision tree to determine the sequence of procedures necessary to perform size analysis is shown in Figure 1. The guidelines for practical application of this Part are provided in Annex A.
General principles of sieving are given in ISO 2591-1.

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