GB/T 2007.6-1987General rules for the sampling and sample preparation of minerals in bulk - Determination of moisture content - Heat drying method (English PDF)
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Issued by
National Standard Bureau
Level / Type
National · Recommended
Issue date
December 15, 1987
Implementation date
October 1, 1988
Scope
GB/T 2007.6-1987 (General rules for the sampling and sample preparation of minerals in bulk - Determination of moisture content - Heat drying method) is available as an English-translated PDF.
GB/T 2007.6-1987 is the Chinese standard "General rules for the sampling and sample preparation of minerals in bulk - Determination of moisture content - Heat drying method".
Its scope clause reads: This standard applies to the determination of moisture content of ore described in GB 2007.1. However, it does not apply to some easily oxidized sulfide ore.
Its clauses include scope of application; instruments; sample; calculation and result expression.
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Document preview — GB/T 2007.6-1987
National Standard of the People's Republic of China
Issued by: National Standard Bureau
Contents
- 1 Scope of application3
- 2 Normative references3
- 3 Instruments3
- 4 Sample3
- 5 Determination4
- 6 Calculation and result expression5
- (Supplement)7
- Annex B Sprayed Water and Rain Water Correction (Supplement)8
- Additional information:13
1 Scope of application
This standard applies to the determination of moisture content of ore described in GB
2007.1. However, it does not apply to some easily oxidized sulfide ore.
2 Normative references
GB 2007.1 General rules for the sampling and sample preparation of minerals in bulk-Sampling by manual method
GB 2007.2 General rules for the sampling and sample preparation of minerals in bulk-Manual method of sample preparation
3 Instruments
3.1 Drying plate: Stainless metal plate of which the surface is smooth and clean. It can accommodate a specified number of samples of which the thickness of sample layer does not exceed 31.5mm.
3.2 Drying oven: Air-blowing device that has adjustable temperature control device with temperature error of less than ±5°C, and can make air flow inside the drying oven without blowing away the samples.
3.3 Balance: Maximum weighing is not less than 3 000g. Sensitivity is 0.1g.
4 Sample
Take samples and prepare samples in accordance with relevant standards. For samples that are too wet or sticky and thus hard to sift or crush or divide, samples can be pre-dried until sample preparation is not difficult (see Annex A). Minimum mass of required aqueous sample is shown in Table 1.
GB 2007.6-1987
6 Calculation and result expression
6.1 Calculation of sample moisture
Moisture content W 1 (%) of each aqueous content is calculated according to Formula (1).
It is reported to the second decimal:
100
12
32
mm mm
W (1)
Where, m 1 - Mass of drying place, g;
m 2 - Mass of sample and plate before drying, g;
m 3 - Mass of sample and plate after drying, g.
6.2 Calculation of moisture content of one lot of ore
6.2.1 When moisture content of aqueous sample from bulk sample is determined, mean value W of moisture contents of whole lot of ore is calculated according to Formula (2);
it is reported to the first decimal;
21
WW
(2)
Where,
W1, W2 - Respectively referring to moisture determination results of two aqueous samples, expressed in mass percentage.
6.2.2 When moisture content of duplicate sample is determined, calculate according to
Formula (3). Moisture content of duplicate sample is calculated to the first decimal;
moisture content W (%) of whole lot is reported to the first decimal:
k i i k i ii
WN
(3)
Where,
K - Number of duplicate samples;
Ni - Number of increments in i-th duplicate sample.
GB 2007.6-1987
Annex A
Determination of Moisture Content of Sticky and Wet Ore (Supplement)
When it is difficult to crush and divide the sample because the sample is too wet or sticky, sample shall be pre-dried. In this case, determine the moisture content of whole lot of ore according to the method specified in A1 to A3; and then calculate total moisture content according to clause A4 to clause A7.
A1 Mass of sample weighed is accurate to 0.05% of sample mass.
A2 Pave the sample and place it into drying apparatus that is set to a specified temperature or in air; dry to approximate equilibrium between ore moisture and air humidity; do not lose fine powder during the drying process.
A3 After pre-drying of ore, weigh sample's mass again; calculate pre-drying moisture content W p (%) of sample according to Formula (A1).
100
21
m mm
W p
(A.1)
Where, m 1 - Mass of sample before pre-drying, kg;
m 2 - Mass of sample after pre-drying, kg.
A4 Prepare samples for determination of heat drying moisture from pre-dried samples in accordance with relevant standard.
A5 Determine loss on drying of sample according to clause 5.2; and calculate moisture content Wd (%) of sample after pre-drying according to Formula 6.1.
A6 Calculate total moisture content Wpd (%) of sample according to Formula (A2).
d p ppd
WW x
+
100
100
(A.2)
Where,
Wd - Moisture content of sample after pre-drying, %.
A7 Calculate moisture content (%) of the whole lot according to clause 6.2.
GB 2007.6-1987 calculated to the second decimal;
M3 - Mass of sprayed water, t;
M4 - Mass of whole lot of ore that contain sprayed water;
F - Correction coefficient of loss water during spraying; F value is decided by the buyer and the seller through negotiation.
B1.5 The calculation method of moisture content when aqueous sample is taken during ship loading process before water spraying.
Moisture content Ws (%) of a lot of ore to correct spray is calculated according to Formula (B2). The result is accurate to the first decimal:
WWW s x-+
)100( (B.2)
Where,
W - Mean value of moisture contents (%) of aqueous samples taken before spraying, calculated to the second decimal.
Meanings of M3, M4 and F are the same as those in Formula (B1).
B2 Rainwater correction
During handling process in rainy days, correct the amount of rainfall into cabin and handling equipment as well as the moisture content of whole lot of ore exposed to rain.
B2.1 Open-air effective area of cabin exposed to rain: calculate the area exposed to rain, based on cargo ship plan of the ship provided.
B2.2 Effective area of open-air stock bin and belt conveyor exposed to rain: Effective area of stock bin exposed to rain is calculated based on its plan. When belt conveyor is used to transport ore, open-air area of belt conveyor exposed to rain between handling point and aqueous sample taking point shall be calculated through multiplying effective belt width by the length exposed to rain.
B2.3 Rainfall: Place rain gauge verified qualified in the vicinity of handled ore. Monitor the rainfall (mm) during operation period.
B2.4 Mass of rain water: Use Formula (B3) to calculate the mass of rainwater MR(t), rounded to integer;
1000
AR
(B.3)
GB 2007.6-1987
+
x-
)100(-
MFM
WWW
(B.6)
Meanings of M, M4, MR and W in Formula are same as before-mentioned.
B4 After aqueous sample is taken during handling process, calculate the moisture content (%) after correction for the whole lot of ore according to Formula (B7) when the ore is exposed to rain and covered by sprayed water simultaneously. The result is reported to the first decimal:
+
x-+
)100(
MFM
WWW
(B.7)
Meanings of F, M3, M4, MR and W in Formula are same as before-mentioned.
B5 Calculation examples
Example 1: Calculation method of moisture content of delivered ore when aqueous sample is taken after spraying during ship unloading process (i.e. correcting sprayed water).
Product name: Iron ore.
Lot size: 20 000t.
Number of duplicate samples: 6.
During unloading process, in order to prevent environmental pollution, spray the water into the cabin while unloading. Sampling means taking an increment from grab buckets for every 20 grab buckets during ship unloading process; the whole lot is made into six duplicate samples; weighted average moisture of six duplicate samples is 4.62%; 120t water is sprayed to the whole lot of ore; take 0.9 as F value. Moisture content s
W (%) of this lot of ore before spraying is calculated as follows:
Example 2: Calculation method of moisture content of delivered ore in ships when water is sprayed to ore after aqueous sample taking during ship unloading process.
Product name: Talc slag.
Lot size: 2 000t.
In order to protect the health of handling workers and prevent environmental pollution, spray the water to the cabin during ship loading' to prepare sample, take an increment from
Chinese Standards
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Translated by: Field Test Asia Pte. Ltd. (Incorporated & taxed in Singapore. Tax ID: 201302277C)
Linkin: https://www.linkedin.com/in/waynezhengwenrui/
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 13 pages — is available in the English PDF.
Referenced standards
Normative references
GB 2007.1 · GB 2007.2
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