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GB/T 10322.5-2016 English PDF (GBT10322.5-2016)

GB/T 10322.5-2016 English PDF (GBT10322.5-2016)

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GB/T 10322.5-2016: Iron ores -- Determination of the moisture content of a lot

GB/T 10322.5-2016
Iron ores - Determination of the moisture content of a lot
ICS 73.060.10
D31
National Standards of People's Republic of China
Replacing GB/T 10322.5-2000
Determination of moisture content in iron ore consignment
(ISO 3087.2011, IDT)
Published 2016-12-13
2017-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China issued
Foreword
GB/T 10322 "iron" is divided into eight parts.
--- Part 1. Sampling and sample preparation of iron ore;
--- Part 2. Experimental methods for evaluation of iron ore quality fluctuations; --- Part 3. Experimental methods ore sampling precision checking;
--- Part 4. Experimental methods ore checking the bias of sampling;
--- Part 5. Determination of moisture content of iron in the consignment; --- Part 6. Determination of thermal cracking index of ore;
--- Part 7. Direct reduction of iron ore and iron sieve measurement of particle size distribution; --- Part 8. iron adsorption specific surface area as measured a single point nitrogen. This section GB/T 510 322 of Part.
This section drafted in accordance with the rules GB/T 1.1-2009 given.
This partial replacement GB/T 10322.5-2000 "iron consignment Determination of moisture content." This portion of the GB/T 10322.5- Comparison except for some editorial changes, the main technical changes are as follows. 7.2 Determination of decomposition of the original --- General 7.2.1, 7.2.2, 7.2.3 conventional methods and assays of high moisture content of the ore combined water; 7.2.1 General supplemented --- "when the sample is too wet or sticky, it is difficult for the screening, crushing, reduced time-sharing, in accordance with appendix A sample may Pre-drying procedure ";
--- 7.2.3 supplemented method of measuring high moisture content of the ore combined water; --- 9.2.1 supplemented with "the amount of rain or watering amount during loading or unloading of iron ore should be in accordance with procedures specified in Annex B of repair Positive "requirement.
This method using an interpreter section identical with 3087 ISO .2011 "iron ore consignment Determination of moisture content." Relationship with the consistency of the international normative documents referenced in our files are as follows. --- GB/T 10322.1-2014 iron sampling and sample preparation (ISO 3082.2009, IDT) --- GB/T 20565-2006 term iron and direct reduced iron (ISO 11323.2002, IDT) --- GB T 24190-2009 Determination of water content iron compound/Karl Fischer titration method (ISO 7335.1997, MOD) This section was proposed by China Iron and Steel Association.
This part of the iron ore and DRI National Standardization Committee (SAC/TC317) centralized. This section was drafted. Shanghai Baosteel Industrial Services Ltd, Baoshan Iron and Steel Co., Metallurgical Industry Information Standards Institute Study hospital.
The main drafters of this section. Chen Xiaoqi, Wang Han, in a peak, Wang Chunsheng, Lu Huizhong, Chen Zibin. This section replaces the following previously issued as follows.
--- GB/T 10322.5-2000.
Determination of moisture content in iron ore consignment
1 Scope
GB/T 10322 This section provides a method for measuring moisture content of iron ore batch delivery. This section applies to all types of iron ore, including natural and processed ore. 2 Normative references
The following documents for the application of this document is essential. For dated references, only applies to the version dated paper Pieces. For undated references, the latest edition (including any amendments) applies to this document. ISO 3082 ore sampling and sample preparation (Iornores-Samplingandsampleperarationprocedures) Determination of iron compound ISO 7335 Water Content Karl Fischer titration (Iornores-Determinationofcombined water-KarlFischermethod)
ISO 11323 and direct reduced iron ore term (Iornoresanddirectreducediron-Vocabulary) 3 Terms and Definitions
ISO 11323 defines terms and definitions apply to this document.
Principle 4
Test specimens in air at 105 ℃ dried to constant weight, mass loss was measured, the moisture content is the mass of the sample relative to the initial mass loss The mass fraction of the amount (%) said.
5 devices
5.1 drying trays. the surface is smooth, clean and dry, sample thickness can accommodate no more than a predetermined number of test specimens 31.5mm vessel, such as Stainless steel plate.
5.2 drying oven. a function Electric Blast drying oven, the temperature control of 105 ℃ ± 5 ℃. 5.3 weighing apparatus. accurate to at least 0.05% of the original mass of the test sample. The initial mass of the test sample should be equipped with sufficient capacity, said It means an amount.
6 Sample Preparation
Sample preparation and sample should be taken in accordance with ISO 3082. Kind of quality test its nominal maximum particle size relationships are shown in Table 1, and ISO 3082 Consistent.
Table 1 Test sample minimum mass
Test samples nominal maximum particle size/mm
Greater than or equal to less than
Test specimens minimum mass/kg
22.4
10.0
31.5
22.4
10.0
7 Test Procedure
7.1 Determination of the number of water
Samples prepared according to the situation, a predetermined number of test specimens in Table 2, water was measured once each test sample. Obtained in the test sample After, as soon as possible should be also said that the initial mass of each test sample, to minimize the loss of moisture in the air. Table 2 Test Sample number
Preparation of samples where the number of sub-samples of each consignment test measured the number of samples Prepared from a large sample - each bulk sample 4
Prepared from a sub-sample
Each subsample 2 4
3 to 7 each subsample least 2
≥8 each sub-sample at least 1
Preparation of samples from parts - each increment least 1
7.2 Determination
7.2.1 General
Moisture content can be measured according to 7.2.2, and for the combined water content of the ore or more than 8% measured according to 7.2.3. When the sample is too wet or sticky, difficult sieving, crushing, reduced time-sharing, the sample may be pre-dried according to the procedure in Appendix A. 7.2.2 conventional methods
a) The test sample was dried weighed plated disc quality (see 5.1), the sample thickness of not more than 31.5mm, and the total mass of said at once. 0.05% of the total value of the recording quality, the quality tray drying, the initial mass of the test sample (m1) and the initial mass of the test sample. b) The dried disks containing the test sample placed in a drying oven set temperature of 105 ℃ (see 5.2), the holding this temperature for not less than 4h. The dried disks containing the test sample was removed from the oven, weighed and immediately hot, minimize reabsorption of water. Or on the secret Closing the vessel was cooled to room temperature and weighed. It should be indicated on the weighing methods used in the report. c) the test sample is again dried with an oven plate placed in, heating was continued IH, and weighing the same way. d) repeating the procedure described above, until the mass difference between two successive measured up to 0.05% or less of the initial mass of the test sample. The last known recording quality (m2) deserve.
Note 1. the weighing device to avoid exposure to heat.
Note 2. The same type of iron ore for the case of a series of moisture determination, the test sample can be specified according to a predetermined drying time checking test. Note 3. In order to reduce the drying time, it is recommended to reduce the thickness of the sample, drying time may be predetermined by preliminary tests checked. Note 4. In order to facilitate, for the ore particle size of less than 31.5mm, the mass of 10kg can be divided into two test specimens for determination of moisture content. In the calculation results It should be used when the average value and the average mass loss of two drying two initial mass. 7.2.3 Determination of combined water ore high moisture content
Containing ore or more combined water 8%, the following procedure may be employed. a) The test sample was dried weighed plated disc quality (see 5.1), the sample thickness of not more than 31.5mm, and the total mass of said at once. The total mass of the recording disk was dried mass, the initial mass of the test sample (m1). b) The dried disks containing the test samples in a drying oven set at 105 ℃ (see 5.2), the maintain the temperature of not less than 24h, from The oven dried sample containing the test plate taken out, weighed and immediately hot, minimize reabsorption of water, or in closed After the vessel was cooled to room temperature, weighed, said recording quality obtained in (m2). It should be indicated on the weighing methods used in the report. Note 1. 7.2.2 Note 1 Note 4 - The same applies to 7.2.3.
Note 2. Determination of the water content of the iron compound refer to the ISO 7335 KarlFischer method. 8 results confirm the
To confirm the test results shall conduct regular checks on test procedures and test equipment. According to this standard, should be checked again in a conventional Before the test in advance, and periodically thereafter. For each test chamber to determine an average frequency of check. Confirm the details of the content of the following items Fine record and save.
a) measuring the amount of water sprayed
--- meter.
b) measuring rainfall
--- rain gauge.
c) Water Test
--- drying oven temperature/temperature regulator;
--- circulation drying cabinet and the air exchange;
--- weighing device.
9 indicates calculation results and
9.1 test sample
Each test sample was measured moisture content Wi result, the mass fraction (%) represents, (1) is calculated by the formula quoted to 2 decimal places. wi =
m1-m2
m1 ×
100 (1)
Where.
M1 --- initial mass of the test sample in grams (G);
--- M2 mass after drying the test sample in grams (g).
9.2 consignment
9.2.1 consignment moisture content, calculated as needed by the formula (2) to (5) in a report to the first decimal. The amount of rain or watering amount during loading or unloading of iron ore should be corrected according to the procedure specified in Appendix B, respectively. 9.2.2 When shipment is large samples taken of the water content measurement, the water content of the consignment is determined as follows. If the four poor test results does not exceed 1.3r specified in Table 3, the arithmetic average of the four results w-, is the consignment of Moisture content, (2) calculated using the formula, mass fraction (%) FIG. w- =
w1 w2 w3 w4
(2)
Wherein w1, w2, w3, w4 are the measurement results of the water test four samples, mass fraction (%) FIG. If more than four poor test results in Table 3 in a predetermined 1.3r, the median is to be taken as the moisture content of the batch delivery. Four The median value is defined as the test results of two non-extrema test results averaged. Repeatability Table 3 Large range of sample Moisture
Average moisture content w- (mass fraction) /% repeatability limit r * (mass fraction)/repeatability limit of 1.3% (mass fraction) /% w-≤3 0.20 0.26
3 \u003cw-≤6 0.25 0.33
6 \u003cw- 0.31 0.40
* Repeatability range of theoretical basis in Appendix C.
9.2.3 If the quantified sample and is measured for each sub-sample, taking into account the number of each sub-like composition like parts, the delivery lot of water W- content should be a weighted average of all the sub-sample results, (3) calculated by the formula, mass fraction (%) FIG. w- =
i = 1
Niwi
i = 1
Ni
(3)
Where.
K --- subsample number;
Ni --- i-th sub-samples the number of parts like;
Wi --- i-th sub-like moisture measurement result, the mass fraction (%) that the number of sub-samples the test sample n replicates Regulation Given in Table 2 row 2 to 4.
If the consignment as a whole can not be sampled, or in the case of sampling timing, the desired quality of the consignment to several unequal Separate part to sampling, the moisture content of each section should measured separately and added to the measurement result by the formula (4) parts of water content Weighted average calculation of the average moisture content of the consignment of w-, mass fraction (%) said. w- =
i = 1
miwi
i = 1
mi
(4)
Where.
--- K number of subsamples in the consignment;
Mass mi The --- Part I;
Part of the measurement result --- i Wi moisture content, mass fraction (%) FIG. The arithmetic average of all the results like parts 9.2.4 If moisture measurement samples for each of parts, the moisture content of the consignment to be obtained in accordance with 9.1 Value, calculated from w to formula (5), to the mass fraction (%) FIG.
w- =
i = 1
wi
(5)
Where.
--- n-number of parts like;
Wi --- i-th increments the moisture content of the measurement result, the mass fraction (%) FIG. 10 test report
The test report shall include the following information, test cases reported in Appendix D. a) the number of this section, for example, GB/T 10322.5;
b) the sample identification information is necessary;
c) test results;
d) a result parameter correlation results;
e) determining the special circumstances relates to but not specified, or in any part of this operation may affect measurement results. Appendix A
(Normative)
Determination too wet or sticky iron ore moisture content
A.1 General
When the sample is too wet or sticky difficult screened, crushed, reduced time-sharing, the sample may be pre-dried up to a normal sample preparation. In this case, to get the moisture content of the consignment, it shall be pre-dried in this appendix predetermined program. In the sample is at Li, the initial mass and the mass of the dried sample after pre-weighed, pre-dried to be noted that the accuracy of moisture content measurement. A.2 The initial mass of the sample.
A.3 pave the sample uniformly, and dried in air or drying apparatus to the temperature not higher than 105 ℃. Pre-drying stage temperature and Selection time of the ore to be difficult to re-absorb water during further processing. A.4 After pre-drying, and then measuring the mass of the sample.
A.5 formula (A.1) calculates the moisture content of the predried, wp, mass fraction (%) FIG. wp =
m'1-m'2
m'1 ×
100 (A.1)
Where.
--- M'1 initial mass of the sample in grams (G);
--- Pre-dried mass M'2 sample in grams (g).
A.6 moisture determination test samples prepared from the pre-drying a sample in accordance with ISO 3082 procedures. A.7 7.2 assay according to the kind of loss on drying, and then, mass fraction (%) shows a residual moisture content of 9.1 calculated. A.8 calculated by the formula (A.2) total moisture content (when the access kind) wpd, mass fraction (%) FIG. wpd = wp
100-wp
100 × wd
(A.2)
Where.
WD --- After pre-drying according to the remaining moisture content of 9.1 obtained mass fraction (%) FIG. A.9 9.2 Determination of moisture content according to the consignment, mass fraction (%) FIG. A.10 like if it was not water quality, according to the method specified in this text, all samples were dried for determination of moisture content. Appendix B
(Normative)
Spraying water and/or rain water correction
B.1 General
B.1.1 water due to the following reasons.
a) handling port environmental protection regulations;
b) due to the characteristics of the ore, climatic conditions, iron ore and other handling equipment handling difficult. When rainfall occurs whenever the moisture content B.1.2 in the consignment during loading and unloading operations, the impact of rain to be corrected right. B.2 correction spraying water
B.2.1 General
In case of unloading the consignment, sprinkler means water is sprayed into the cabin and/or any sample region and extending to a moisture sampling point. In charge Case, sprinkler means water is sprayed into the cabin and/or sampling point located behind the water sample loading conveyor. This section describes two methods of correction of the sprinkler, one is at the discharge point of the process prior to spill into the sample water, the other is filling process After sampling point sprinkled into the water.
B.2.2 measurement spraying water
Sprinkling Accuracy ± 5% of the flow meter should be used. The resulting spray volume should be multiplied by the density of water, to convert the mass to volume m3, tonnes (t).
Note. Let freshwater density of 1t/m3.
B.2.3 consignment of quality
Whether or delivery receipt, no spraying water or rain water falling into the quality of the consignment of the m4, tonnes (t); or spraying water or rain fall Water quality consignment m5, tonnes (t), shall be by Draft Survey or other internationally recognized, such as automatic weighing device or hopper scales And other means to determine.
Note. B.2.4, B.2.5, B.2.6, B.3.7, B.4 B.5, and these examples are given below assuming Draft Survey determined by the quality of the consignment, including front loading Or an amount of rain or watering calculated after the increase in the discharge. If automatic weighing hopper scales or the like means to be provided with particular emphasis on the location of the sampling points and the weighing device correctly. For example, in unloading Feed process, when the sampling may not be close to the weighing means and the correction of the sprinkler rain, and the sampling point is away from the weighing device to be corrected. B.2.4 water samples taken before the unloading process, the calculation of the moisture content corrected for the water spray Ws moisture content of the consignment sprinkling corrected, calculate the available formula (B.1), mass fraction (%) of the report through a Decimals.
ws = w - (100-w-)
m3
m4 × f
(B.1)
Where.
Spraying water containing an average value of w to the moisture content of the sample taken ---, mass fraction (%), calculated to the second decimal; --- M3 sprayed water quality, tonnes (T);
--- M4 B.2.3 determined by spraying water free mass consignment, tonnes (T); f --- water loss correction coefficient predetermined spraying.
NOTE. To determine an appropriate coefficient f, the following should be taken into account various factors. a) atmospheric conditions.
---humidity;
--- atmospheric temperature;
--- wind speed impact;
---rainfall.
b) minerals/ores features.
---granularity;
---mineralogy;
--- porosity/texture;
--- moisture content.
c) the arrangement of sprinklers/shape.
d) water, chemical reagents/additives.
B.2.5 sample taken after the water in the filling process, the calculation of the moisture content corrected for the water spray Ws moisture content of the consignment sprinkling corrected, can formula (B.2) is calculated, mass fraction (%) of the report through a Decimals.
ws = w- (100-w-)
m3
m5 × f
(B.2)
Where.
--- w to averaging before spraying the water content of the sample to the mass fraction (%), calculated to the second decimal; --- M3 sprayed water quality, tonnes (T);
M5 --- consignment mass containing water by spraying B.2.3 determined tonnes (T); f --- with B.2.4 injection.
B.3 rain correction
B.3.1 General
Determine the moisture content o...

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