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GB/T 10322.1-2014 English PDF (GBT10322.1-2014)

GB/T 10322.1-2014 English PDF (GBT10322.1-2014)

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GB/T 10322.1-2014: Iron ores -- Sampling and sample preparation procedures

GB/T 10322.1-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.060.10
D 31
GB/T 10322.1-2014 / ISO 3082:2009
Replacing GB/T 10322.1-2000
Iron Ores – Sampling and Sample Preparation
Procedures
(ISO 3082:2009, IDT)
ISSUED ON: JUNE 24, 2014
IMPLEMENTED ON: APRIL 01, 2015
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 5
1 Scope ... 11
2 Normative References ... 11
3 Terms and Definitions ... 13
4 General Considerations for Sampling and Sample Preparation ... 15
4.1 Basic requirements ... 15
4.2 Establishing a sampling scheme ... 16
4.3 System verification... 17
5 Fundamentals of Sampling and Sample Preparation ... 18
5.1 Minimization of bias ... 18
5.1.1 General ... 18
5.1.2 Minimization of particle size degradation ... 18
5.1.3 Extraction of increments ... 18
5.1.4 Increment mass ... 19
5.2 Overall precision ... 21
5.3 Quality variation ... 23
5.4 Sampling precision and number of primary increments ... 24
5.4.1 Mass-basis sampling ... 24
5.4.2 Time-basis sampling ... 25
5.5 Precision of sample preparation and overall precision ... 25
5.5.1 General ... 25
5.5.2 Preparation and measurement of gross sample ... 26
5.5.3 Preparation and measurement of partial samples... 26
5.5.4 Preparation and measurement of each increment ... 26
6 Methods of Sampling ... 27
6.1 Mass-basis sampling ... 27
6.1.1 Mass of increment ... 27
6.1.2 Quality variation ... 28
6.1.3 Number of primary increments ... 28
6.1.4 Sampling interval ... 28
6.1.5 Methods of taking increments ... 29
6.2 Time-basis sampling ... 29
6.2.1 Mass of increment ... 29
6.2.2 Quality variation ... 30
6.2.3 Number of increments ... 30
6.2.4 Sampling interval ... 30
6.2.5 Methods of taking increments ... 30
6.3 Stratified random sampling within fixed mass or time intervals ... 31 6.3.1 Fixed mass intervals ... 31
6.3.2 Fixed time intervals ... 31
7 Sampling from Moving Streams ... 31
7.1 General ... 31
7.2 Safety of operations ... 32
7.3 Robustness of sampling installation ... 32
7.4 Versatility of sampling system ... 33
7.5 Primary samplers ... 33
7.5.1 Location ... 33
7.5.2 Types of primary sampler ... 33
7.5.3 General design criteria for primary cutters ... 37
7.5.4 Cutter aperture of primary sampler ... 37
7.5.5 Cutter speed of primary sampler ... 38
7.6 Secondary and subsequent samplers ... 38
7.7 On-line sample preparation ... 39
7.7.1 Arrangement for sample preparation ... 39
7.7.2 Crushers ... 39
7.7.3 Dividers ... 39
7.7.4 Dryers ... 40
7.8 Checking precision and bias ... 40
7.9 Cleaning and maintenance ... 41
7.10 Example of a flowsheet... 44
8 Sampling from Stationary Situations ... 46
8.1 General ... 46
8.2 Sampling from wagons ... 46
8.2.1 Sampling devices ... 46
8.2.2 Number of primary increments ... 47
8.2.3 Method of sampling ... 47
8.3 Sampling from ships, stockpiles and bunkers ... 47
9 Stopped-Belt Reference Sampling ... 48
10 Sample Preparation ... 49
10.1 Fundamentals ... 49
10.1.1 General ... 49
10.1.2 Drying ... 50
10.1.3 Crushing and grinding ... 50
10.1.4 Mixing ... 51
10.1.5 Sample division ... 51
10.1.6 Mass of divided sample ... 52
10.1.7 Split use and multiple use of sample ... 56
10.2 Method of constituting partial samples or a gross sample ... 57
10.2.1 General ... 57
10.2.2 Method of constitution for mass-basis sampling ... 57
10.2.3 Method of constitution for time-basis sampling ... 57
10.2.4 Special procedure for moisture content... 58
10.3 Mechanical methods of division ... 58
10.3.1 Mechanical increment division ... 58
10.3.2 Other mechanical division methods ... 60
10.4 Manual methods of division ... 60
10.4.1 General ... 60
10.4.2 Manual increment division ... 60
10.4.3 Manual riffle-division method ... 63
10.5 Preparation of test samples for chemical analysis ... 64
10.5.1 Mass and particle size ... 64
10.5.2 Preparation to -250 µm ... 66
10.5.3 Final preparation ... 67
10.5.4 Grinding to -100 µm or -160 µm ... 67
10.5.5 Distribution of samples for chemical analysis ... 68
10.6 Preparation of test samples for moisture determination ... 68
10.7 Preparation of test samples for size determination ... 70
10.8 Preparation of test samples for physical testing ... 70
10.8.1 Selection of sample preparation procedure... 70
10.8.2 Extraction of test samples ... 70
10.8.3 Reserve samples ... 79
11 Packing and Marking of Samples ... 80
Annex A (Informative) Inspection of Mechanical Sampling Systems ... 81
Annex B (Normative) Equation for Number of Increments ... 90
Annex C (Informative) Alternative Methods of Taking the Reference Sample 93 Annex D (Normative) Procedure for Determining the Minimum Mass of Divided Gross Sample for Size Determination Using Other Mechanical Division
Methods ... 99
Annex E (Normative) Riffle Dividers ... 102
Bibliography ... 104
Foreword
GB/T 10322 Iron Ores can be divided into the following 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 Ore - Determination of Size Distribution by Sieving;
--- Part 8: Iron Ores - Single-Point Determination of Specific Surface Area - Nitrogen Adsorption Method.
This Part is Part 1 of GB/T 10322.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part replaced GB/T 10322.1-2000 Iron Ores - Sampling and Sample Preparation Procedures. Compared with GB/T 10322.1-2000, the major technical changes of this Part are as follows besides the editorial modifications:
--- Modify "one-time increment" and "one-time sampling" in the original part into "primary increment" and "primary sampling", respectively; change "cutting mouth opening" into "cutting opening degree".
--- Add "except for the determination of bulk density by method 2 in ISO 3852:2007" in the scope of Clause 1.
--- MODIFY "3.1 Delivery lot", "3.7 Experimental sample", "3.12 Fixed ratio division of sample" in Clause 3 Terms and Definitions INTO "3.1 Lot", "3.7 Test portion", "3.12 Proportional mass division".
--- Modify 4.1 "Only for iron ore concentrate powder" into "Only for iron ore with a nominal maximum particle size less than 1mm".
--- Add "and the quality characteristics that need to be determined" in a) of 4.2. Change c) of the original part of 4.2 into d) of the current part; and change h) of the original part into c) of the current part. Also add to 4.2 the following: "For the gross sample or partial sample used for physical test, special attention shall be paid to the total weight of the required sample (see 10.1.6.3). When the mass of the gross sample or partial sample is less than the required mass of the sample prepared for the physical test, it shall be necessary to increase the number or mass of increments taken to achieve the required mass. It is better to increase the number of increments than to increase the mass of increments”.
--- Modify i) of 5.1.3 into "When sampling iron ore concentrate powder with a nominal maximum particle size less than 1 mm, the entire iron ore concentrate powder column shall be taken".
--- Modify "cutting-type one-time sampling machine" in 5.1.4.1 into "cutting-type sampling machine".
--- Add "l2 - the length of the ore flow of the full cross-section intercepted from the conveyor, in meters (m)" and "for primary sampling, it shall be no less than 30mm; and for sampling after the primary sampling stage, it shall be no less than 10mm." to 5.1.4.2.
--- Modify “this method is only applicable to the sampling of iron ore concentrate powders” in 5.1.4.3 into “this method of sampling in increment sample is only applicable to iron ore with nominal maximum particle size less than 1 mm”. --- Change mass range from original 3 delivery lots to 9 in Table 1 of 5.2; so there is a new parameter specification for the approximate total precision βSPM, which is enlarged compared with the original set total precision.
--- The ore with unknown quality fluctuation shall be classified as follows before determining the quality fluctuation in 5.3: a) If there is no such ore or similar ore quality fluctuation category before, the quality fluctuation of this iron ore shall be determined as "Large". b) If there is a similar ore quality fluctuation category before, the quality fluctuation of this ore shall take the similar ore quality fluctuation category as the starting point. Also add the provisions that "If other physical or metallurgical properties not listed in Table 2 are measured separately, the quality fluctuation of the ore shall be large." and "If the delivery batch is small, the ore with large quality fluctuation may not take the increments according to the number of increments calculated by Formula (8). In this case, the maximum number of increments shall be taken as much as possible, and in order to compensate for the poor sampling precision, the sample preparation precision shall be improved to meet the total precision requirements of βSPM. For example, by preparing and analysing more partial samples, the used procedures shall be documented in the Sampling Report".
--- Enlarge the sampling precision values for P in Table 3 of 5.4.1.
--- Modify a) and b) of 6.1.1; change the original a) "Installing a variable speed sampling machine" into "Controlling the ore flow rate on the belt conveyor before the sampling point to reduce the fluctuation of the flow rate”; change the original b) "Conduct the ore flow rate on belt conveyor before sampling point" into "Install a variable speed sampling machine that allows the speed of each increment to be varied so that the taken speed is proportional to the ore flow rate on the conveyor belt when taking each increment.”
--- Change the original "7.3 Sampling Device Strength" into "Sampling Device Durability".
--- Change the original 7.5.2 "...the most widely used model is the interception type one-time sampler" into "the most typical model is the cutting type primary sampling machine". Change the title of Figure 1 "Intercepting Sampling Machine" into "Cutting Sampling Machine".
--- Add the provisions of "g) Chute type reduction machine [see Figure 3f)]" to 7.7.3. --- Change "7.7.4 Oven" into "7.7.4 Drying".
--- Delete the original "8.2.1 Overview"; the current 8.2.1 is "Sampling equipment"; change the original 8.2.2 "Sampling equipment" into "the number of primary increments", and so on.
--- Change the original "9 Stop-belt sampling method for reference samples" into "9 Stop-belt reference sampling". Add "h) Store incremental-samples, partial samples or gross samples in labelled containers as specified in Clause 11." and add the provisions that "If stop-belt sampling method is infeasible, one of the options described in Appendix C may be used".
--- Change the original "10.1.6 Split use of sample and multiple use of sample" into "10.1.7 Split use of sample and multiple use of sample"; and add "10.1.6 Quality of reduced sample"; and add the provisions of the determination of moisture, chemical analysis, particle size, as well as reduction of physical test samples. --- The original Table 4 has undergone major revisions. CHANGE The original delivery batch mass determined the minimum number of parts for moisture measurement in each delivery batch INTO the nominal maximum particle size was used to determine the minimum mass (kg) of the reduced gross sample. Add the minimum mass (kg) of the gross sample after the standard deviation of 0.1% and 0.05% Fe reduction.
--- The original Table 6 has undergone major revisions. The original Table 6 is "Minimum mass of gross sample reduction for moisture measurement and
chemical analysis"; and the current Table 6 is "Physical test sample preparation and measurement precision".
--- The original Table 7 is "Nominal maximum particle size, sample-spreading Iron Ores – Sampling and Sample Preparation
Procedures
WARNING -- This Part may involve hazardous materials, operations and
equipment, and does not purport to address all the safety issues associated with its use. It is the responsibility of the user of this Part to establish appropriate health and safety practices and determine the applicability of regulatory limitations prior to use.
1 Scope
This Part of GB/T 10322 gives the mechanical sampling, manual sampling and preparation of samples taken from a lot under transfer, and determines the chemical composition, moisture content, size distribution and other physical and metallurgical properties of the lot, except bulk density obtained using ISO 3852:2007 (Method 2). It includes:
a) the underlying theory,
b) the basic principles for sampling and preparation of samples, and
c) the basic requirements for the design, installation and operation of sampling systems.
The methods specified in this Part are applicable to both the loading and discharging of a lot by means of belt conveyors and other ore-handling equipment to which a mechanical sampler may be installed or where manual sampling may safely be conducted.
The methods are applicable to all iron ores, whether natural or processed (e.g., concentrates and agglomerates, such as pellets or sinters).
2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this document.
ISO 565 Test Sieves – Metal Wire Cloth, Perforated Metal Plate and
ISO 8371 Iron Ores for Blast Furnace Feedstocks – Determination of the
Decrepitation Index
ISO 11256 Iron Ore Pellets for Shaft Direct-Reduction Feedstocks –
Determination of the Clustering Index
ISO 11257 Iron Ores for Shaft Direct-Reduction Feedstocks – Determination of the Low-Temperature Reduction-Disintegration Index and Degree of Metallization ISO 11258 Iron Ores for Shaft Direct-Reduction Feedstocks – Determination of the Reducibility Index, Final Degree of Reduction and Degree of Metallization ISO 11323 Iron Ore and Direct Reduced Iron – Vocabulary
ISO 13930 Iron Ores for Blast Furnace Feedstocks – Determination of Low- Temperature Reduction-Disintegration Indices by Dynamic Method
3 Terms and Definitions
For the purposes of this document, the terms and definitions contained in ISO 11323, as well as those given below, apply.
3.1 Lot
Discrete and defined quantity of iron ore and direct reduced iron for which quality characteristics are to be assessed.
3.2 Increment
Quantity of iron ore and direct reduced iron collected in a single operation of a device for sampling or sample division.
3.3 Sample
Relatively small quantity of iron ore and direct reduced iron, so taken from a lot as to be representative in respect of the quality characteristics to be assessed. 3.4 Partial sample
Sample comprising of less than the complete number of increments needed for a gross sample.
3.5 Gross sample
Sample comprising all increments, entirely representative of all quality characteristics of a lot.

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