This standard specifies the method for sampling coal from coal seams. This standard applies to the sampling of coal from lignite, bituminous coal and anthracite seams. GB 482-1995 Method for sampling coal from coal seams GB482-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method for Sampling Coal Seams
Sampling uf cual in scam
1 Subject content and scope of application
This standard specifies the method for sampling coal seams. This standard is applicable to the sampling of coal seams in lignite, bituminous coal and anthracite. 2 Referenced standards
CB474 Method for preparation of coal samples
GB217 Method for determination of true and relative density of coal
GB212 Method for industrial analysis of coal
3 General provisions
GB 482-1995
Replaces GB182-79
3.1 Coal samples of coal seams include stratified coal samples and mineable coal samples. Stratified coal samples and mineable coal samples must be taken at the same time. 3.2 Layered coal sampling
3.2.1 The purpose of taking layered coal samples is to identify the properties of each coal layer and interlayer and to check the representative nature of the mineable coal group. 3.2.2 Layered coal samples are taken from each natural layer of coal and interlayer. When the thickness of the interlayer is greater than 0.03m, it is taken as a natural layer.
3.3 Coal sampling
3.3.1 The purpose of taking mineable coal samples is to determine the average properties of all coal layers and interlayers to be mined. 3.3.2 The scope of mineable coal sampling includes all coal layers to be mined and interlayers with a sequence of less than 0.30m; for the original coal seams mined in layers, the samples are taken according to the thickness of the layered mining.
3.3.3 For open-pit mines, coal seams with a mining step height of less than 3.0m shall be implemented in accordance with this standard. When the step height exceeds 3.0m and it is indeed difficult to use the method specified in this standard, a rotary drill can be used to remove the coal core as a mineable coal sample. 3.4 Coal seam samples shall be collected in the tunnel and upwards from the mining work. For the main tunnel excavation face, at least one coal seam sample shall be collected for every 100㎡ of advance; for the mining face, at least one coal seam sample shall be collected, and the number of samples shall be determined according to the length of the mining face. One sample shall be collected for less than 100m, two for 100~200m, and three for more than 200m. If the coal lip structure is complex and the coal quality changes greatly, additional coal seam samples shall be appropriately collected.
3.5 Coal seam samples shall be collected at locations with normal geological structures, but if the geological structure has a great degree of damage to the coal seam and sampling is necessary, sampling shall also be carried out.
3.6 The surface oxidation layer of the coal seam must be removed before sampling. 3.7 Coal seam samples shall be collected by the coal quality management department at its own expense. The specific sampling location shall be in accordance with the provisions of this standard. In case of special circumstances, it may be jointly determined by the geological department.
3.8 Miners should strictly abide by the "Safety Regulations for Coal Mines" to ensure personal safety. Approved by the State Administration of Technical Supervision on August 7, 1995, and implemented on April 1, 1996
4 Tools
GB 482-1995
4.1 Hand-held spreader with flat head and pointed tip or suitable deep sampling machine, 4.2 Hammer.
4.3 Shovel.
4.4 Goggles
4.5 Steel coil; not less than 2m; ruler, leather: not less than 15m. 4.6 Dense, firm, waterproof spreader, area of ​​more than 2.5 m, 4.7 Dense, firm, waterproof bag for coal sample. 4.8 Record book and necessary stationery.
4.9L tool package,
labels are printed in the following form:
Coal seam coal sample report number:
Sampling location:
Working number:
Sampling person:
f. Sampling time:
Drying number:
The label is filled in and then loaded into the label plastic bag.
5 Sampling steps
5.1 Preparation
First remove the surface oxide layer of the coal seam and carefully level the surface of the coal seam. The leveled surface must be perpendicular to the top and bottom plates. Then, on the leveled surface of the coal seam, draw four straight lines from top to bottom that are perpendicular to the top and bottom plates. The distance between the true lines is 0.10m when the thickness of the coal seam is greater than or equal to 1.30 m, and 0.15m when the thickness of the coal seam is less than 1.30 m. If the coal seam is soft, the distance between the second and third lines can be appropriately widened. Take a layered butterfly sample between the first and second lines, and take a workable coal sample between the fourth line. The groove depth is 0.051 m. 5. 2 Taking of layered coal samples
The natural layers of coal flint can be marked on the first and second lines, and the thickness of each natural layer and the total thickness can be measured and verified. Record the lithology, thickness and other matters related to the coal seam of each natural layer in detail, place a cloth on the bottom plate of the sampling point so that the coal samples collected can fall on the cloth, and collect them according to the natural layers. Every time a natural layer is collected, it is completely put into the coal sample bag, and the bag mouth is tightened, the cloth is cleaned, and then another natural layer is taken until it is finished.
Each sample bag must be accompanied by a label filled in according to regulations. Layer coal number: X-X.
Example: 2---4 is the fourth layer of the second coal seam. 5.3 Collection of recoverable coal samples
When taking recoverable coal samples, place a cloth on the bottom plate of the sampling point so that the coal samples collected can fall on the cloth. The coal layers and fire layers that should be collected during mining are collected together. All the collected coal samples are put into the coal sample bag. Each coal sample bag is attached with a label filled in according to regulations. The number of the collectible coal samples is: X-1.2.3..
.2-1.2, 3. indicates the collectible coal samples of the second coal seam. Including, 2.3... layers. 6 Results and treatment
6.1 After the coal seam is mined, the coal samples should be sent to the sample preparation air in time according to GB47A. Coal samples shall not be found in non-destructive places. GB 482—1995
6.2 According to GR217 and GB212, the true relative density and ash content of each layer coal sample are determined. Based on the determination results, the weighted average ash content of all layer samples, the layer to be mined and the coal layer samples are calculated respectively. The calculation formula is as follows: A.- AuTRDE+ A.TRD.++ A· TRD.I, . TRD, + TRD, =... +t,. TRD. Formula:
A. — Weighted average ash content (dry basis) of coal sample, %: AJ, AA. — Ash content (dry basis) of the 1st, 2nth coal layer or interlayer, %t1.t2\, — Thickness of the 1st, 2nd, ...#th coal layer or interlayer, m — True relative density of the 1st, 2nd, nth coal layer or interlayer, TRD, TRD, TRD.
6.3 The relative difference between the corrected average ash content calculated based on the samples of each layer to be mined and the ash content of the mineable coal sample shall not exceed 10%. If the limit is exceeded, the coal sample taken shall be invalid and shall be taken again. The relative value range is calculated according to the following formula;
Where. Aa.#-
A#— Ae × 100
Al.Open+ A
- Weighted average carbon content (thousand dry basis) of each layer sample to be mined, %; Ad.a
- Ash content (ten dry basis) of mineable coal sample, %. Coal samples for total moisture content determination shall be reduced from mineable coal samples according to GB474. 6.4
6.5 The total moisture content, total sulfur content and calorific value of mineable coal samples shall be determined in the mine laboratory, and industrial analysis shall be conducted. 6.6 At least two representative coal samples shall be selected from each coal seam and sent to the mine every year. The Central Laboratory of the Bureau of Services shall analyze the relevant items of raw coal and floating coal according to GB474.
6.7 The thickness measurement and the calculation results of ash content and true relative density shall be rounded to the second decimal place according to the digital rounding rules.
6.8 Fill in the coal seam coal sample report form according to the format of Appendix Ⅱ and draw a bar chart (including the sequence of false top and false bottom). The bar chart shall be drawn according to the legend in Appendix Ⅱ.
2. Sampling location
Mining Bureau
GB 482—1995
Appendix A
Coal seam coal sample report form
(reference)
Sample period
Filling date
3. Working surface conditions (top plate, bottom plate and water discharge conditions): 4. Coal seam thickness (according to 3.3.2) and ash content (1) (Partial) layer thickness
2) Thickness of the part to be mined
(3) Coal layer thickness
5. Number of mineable coal samples
.m, recovery A
. recovery A
m,Ash content Al
6. Analysis test results of mineable coal samples:
Guizhou-shaped diagram
Proportion:
Slag characteristics
Table A2 Coal seam coal sample column chart and layered coal sample test results Layer name
And characteristics
Layer thickness
True relative density
4 columns × 5 columns
6 columns × 7 columns
Study butterfly layer!
Guizhou to
Ratio:
Layer name
And Egypt sign
Layer original change
GB 482-1995
Continued A2
True Xu relative density
(TRID)
Calculation example
(reference)
4 samples × 5 files
There is a coal seam with a total thickness of 1.62 Ⅱ See Table, it is composed of three coal seams and two interlayers. The relative values ​​of the ash content of each layer and the original rock of the coal seam are shown in Table 2. The weighted average ash content of the mineable coal sample is 19.37%. The relative values ​​of the weighted average ash content of the layer sample to be mined and the coal layer sample and the weighted average ash content of the layer sample to be mined and the ash content of the mineable coal are calculated as follows. Layer structure The first layer (coal) The third layer (coal) The fourth layer (rock) The fifth layer (coal) The weighted average ash content of the layer sample (A) and the relative density of the layer sample (B) are -(10.00×0.30X 1. =36.28
Weighted average ash content (number) of partial stratified samples [(10.00X0.30×1.31)-+(8.00×0.40×1.30)+(85.00×0.12×2.20)+[2.00×0.50×1.32)7-[(0.30×1.31) +(0.30×2.15)4 (0.40×1.30) -(0.12×2.20)+(0.50×7.32 J= 36.28
Weighted average ash content (number) of partial stratified samples [(10.00X0.30×1.31)-+(8.00×0.40×1.30)+(85.00×0. 12× 2.20) - (12.00×0.50×1.32)-f(0.30X 1.31)+(0.40X1.30)+(0.12×2.20)+(0.50X 1.32)7-=20.93 Weighted average carbon content of layered samples ():
[(10.00x 0.80X1.31)+(8.00X. 0.40x 1.30)+(12.00X0.50×1.32)]--1(0.80x 1.31)+(0.46X 1.30'+(0.30X1.32)1 -10, 18d. The relative difference between the average ash content of the added stratified samples and the ash content of the sampled coal samples is A(%) =-
20. 93 - 19. 37
20. 93 + 19. 37
When the A value is less than 10%, the sampled coal meets the requirements. X 100 -= 7. 74
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GB482—1995
Column chart legend
(Supplement)
Baiying sandstone
Anshan aggregate decision
Additional remarks:
GB482-1995
This standard is proposed by the Ministry of Coal Industry of the People's Republic of China. This standard is under the jurisdiction of the National Coal Standardization Technical Committee. This standard was jointly drafted by the Beijing Coal Chemistry Research Institute of the China Coal Research Institute, Jixi Mining Bureau, Hebi Mining Bureau and Beijing Mining Bureau. The main drafters of this standard are Wu Kuanhong, Li Yinghua, Gong Xinglu, Tian Xinhua and Pan Minguang. The Beijing Coal Chemistry Research Institute of the China Coal Research Institute is responsible for the interpretation of this standard.
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