This standard specifies the method for determining the volume percentage of microscopic coal types on pulverized coal light films or lump coal light films. This standard is applicable to bituminous coal and anthracite. GB/T 15590-1995 Method for determining microscopic coal types GB/T15590-1995 Standard download decompression password: www.bzxz.net

UDC 662.81 : 543.06
National Standard of the People's Republic of China
GB/T15590-1995
Determination of microlithotype composition
Determination of microlithotype composition1995-06-12Promulgated
State Administration of Technical Supervision
Implementation on 1996-02-01
National Standard of the People's Republic of China
Determination of microlithotype composition
Determination of microlithotype compositionGB/T15590-1995
This standard adopts IS07404/41986--05--14 "Methods for analysis of bituminous and anthracite coal petrography - Part 4: Determination of microlithotype composition".
Subject content and scope of application
This standard specifies the method for determining the volume percentage of microscopic coal rock types on pulverized coal slides or lump coal slides. This standard applies to bituminous coal and anthracite.
2 Reference standards
GB8899 Method for determining microscopic component groups and minerals of coal GB/T15588 Classification of microscopic components of bituminous coal
GB/T15589 Classification of microscopic coal rock types
3 Key points of the method
Put a twenty-point grid in the eyepiece of a reflecting microscope and observe the pulverized coal slide (or lump coal slide) under an oil-immersion objective. Identify the microscopic coal rock type, microscopic mineralization type and microscopic mineral type based on the number of various microscopic component groups (or microscopic components) and minerals at the intersection of the grid, and use the counting method to count the volume percentage of each type. 4 Materials and instruments
4.1 Reflecting microscope: equipped with oil immersion objective lens of ×25 to ×60 and day mirror of ×8 to ×12. Twenty-point grid sheet should be able to be placed in the eyepiece. 4.2 Twenty-point grid sheet: should match the size of the eyepiece, and the effective coverage area projected on the sample after the eyepiece and objective lens are combined is 50gm×50pm. The grid form is shown in Figure 1.
Approved by the State Administration of Technical Supervision on June 12, 1995 and implemented on February 1, 1996
GB/T15590
0-1995
(on the sample)
Figure 1 Schematic diagram of twenty-point grid
4.3 Stage moving ruler, sample mounting device (flattener, slide, cement) and oil immersion liquid. 4.4 Counter: can record the number of measurement points of each type and the total number of points respectively. 5
Coal samples and test specimens are prepared in accordance with the provisions of GB8899 6 Determination steps
6.1 Preparation
Put a twenty-point grid sheet of corresponding specifications into the eyepiece of the microscope. Adjust the microscope to the Kohler illumination mode, flatten the sample to be measured and place it on the cutting table equipped with a movable ruler, add immersion oil and make it focus. 6.2 Determination on the pulverized coal light sheet
Start from one end of the sample and observe the number of grid intersections that fall on the coal particles in the field of view. If there are less than 10 intersections on the coal particles in a field of view, it is an invalid measurement point; if it is greater than or equal to 10 intersections, the field of view should be regarded as a valid measurement point. The microscopic coal rock type of the valid measurement point is determined according to the provisions of Table 1, Table 2, and Table 3. When the number of intersections falling on the mineral is within the specified range of Table 1, the microscopic coal rock type is determined according to the provisions of Table 2. When it exceeds the given limit of Table 1, the microscopic mineralization type is determined according to the provisions of Table 3: when it is greater than the upper limit of Table 3, it is a microscopic mineral type. Table 1 Allowable number of intersections on minerals in microscopic coal rock types Total number of intersections on coal makeup
Microscopic coal rock types
Microscopic coal
Microshell coal
Microbright coal
Microdark coal
Microscopic coal
Microtriple coal
Number of intersections on clay, quartz and carbonate minerals3
Table 2 Criteria for distinguishing microscopic coal rock types
Number of intersections on sulfide minerals
Number of intersections falling on groups of microscopic components (excluding intersections on minerals)All intersections are on vitrinite
All intersections are on exinite
All intersections are on inertinite
All intersections are on vitrinite and exinite, and each group has at least oneAll intersections are on inertinite and exinite, and each group has at least oneAll intersections are on vitrinite and inertinite All intersections are on vitrinite, plastid and chrysogenite, and each group has at least one point. The total number of intersections on coal particles
17~-18
GB/T15590-1995
Table 3 Criteria for distinguishing microscopic mineralization types
Number of intersections on clay, quartz, carbonate
Salt minerals
Only on sulfide
Minerals Number of intersections on the material
Number of intersections on complex minerals containing sulfide minerals
Number of intersections on other minerals in coal
Sulfide minerals
When there is 1 intersection
Sulfide minerals
When there are 2 intersectionswwW.bzxz.Net
Note: ① When the intersection of the twenty-point grid falls on a cavity (not a mineral) or primary crack of a certain microcomponent, it shall be treated as falling on this microcomponent. ② When a point of the twenty-point grid falls on the boundary of different microcomponents or minerals, it shall be treated in accordance with Article 4.2.2 of GB8899. ③ When the intersection of the twenty-point grid falls on two different coal particles, select coal particles with more than or equal to 10 intersections as measuring points. After identifying a field of view (i.e., measuring points), move the sample in the predetermined direction and step length, and continue to observe the next field of view until more than 500 measuring points are evenly distributed throughout the entire piece. The point spacing and line spacing are 0.4~0.6mm. 6.3 Determination on lump coal light film
When it is necessary to measure on lump coal light film, it should also be carried out in accordance with the provisions of Article 6.2, but the measuring line should be arranged perpendicular to the bedding. Within the measurement area of ​​25mm×25.mm, the point spacing is 0.2~0.4mm and the line spacing is 3~5mm. The total number of points is not less than 5006.4 The determination of microscopic coal rock type can also be carried out in conjunction with the determination of microscopic component groups. The determination method is shown in Appendix A. 7 Result expression
The volume percentage (V/V) of microscopic coal rock type, microscopic mineralization type and microscopic mineral type is expressed as the percentage of the number of statistical measuring points to the total number of effective measuring points. The calculated result is taken to two decimal places and rounded to one decimal place. The measurement results are filled in the table in Appendix B.
8 Precision
8.1 Repeatability
It should meet the requirements of Table 4.
Volume percentage of a certain microscopic coal type 10
>10～30
>30~60
>60～90
8.2 Reproducibility
Should not exceed 1.5 times the repeatability in Table 4. Repeatability
GB/T 15590—1995
Appendix A
Joint determination method of microscopic coal type and microscopic component group (reference)
A1 While determining the microscopic coal type according to the provisions of Chapter 6, use a fixed intersection point near the center of the twenty-point grid to determine the microscopic component group and mineral volume percentage.
A2 Provisions for measuring point statistics:
A2.1 When the fixed intersection of the twenty-point grid and more than 9 other intersections fall on a certain coal particle (see Figure A1a), in addition to counting the microscopic type, the microscopic component group (or mineral) under the fixed intersection is also counted and recorded in the corresponding columns of the two (see Table A1). The total number of such joint measuring points for each sample should be greater than 500 points. A2.2 When there are more than 10 intersections on the coal particle in the field of view, but the fixed intersection for determining the microscopic component is not on the coal particle, this measuring point is called "independent microscopic coal rock type" and only the microscopic coal rock type is counted (see Figure A1b). d
Figure A1 Schematic diagram of measuring point discrimination during joint determination Note: a Microscopic component and corresponding microscopic coal rock type are on the same coal particle, b separate microscopic coal rock type c, d-separate microscopic component e-"separate microscopic coal rock type" and "separate microscopic component" appear on two coal particles at the same time. A2.3 When the fixed intersection point of the determined micro-component falls on a coal particle, but the total number of intersection points falling on any coal particle is less than 10, this measurement point is called a "single micro-component" and only the statistics of the micro-component group are taken (see Figures Alc and Ald). A2.4 When the twenty-point grid intersections fall on two coal particles at the same time, one of which has more than 10 intersections, and the fixed intersection for determining the microscopic components falls on another coal particle, the statistics of "separate microscopic coal rock type" and "separate microscopic components" are made respectively (see Figure A1e).
GB/T15590-1995
A3 The combined determination results are filled in Table A1 and Table A2. Table A1 Record of combined determination of microscopic coal rock types and microscopic component groups Sample submission unit:
Sample submission date:
Microscopic component groups and minerals
Microscopic coal rock types
Individual microscopic components
Microscopic coal
Micro-yao coal
Micro-inert coal
Micro-bright coal
Micro-dark coal
Microscopic inert coal
Micro-three-combination coal
Microscopic mineralization type
Microscopic mineral type
Determination unit:
Technical person in charge:
Sample submission unit:
Sample submission date:
Microscopic components||tt ||Groups and Minerals
Vitrinite
Exinite
Clay Minerals
Carbonates
Sulfides
Percentage
Exinite
Vitrinite
Clay Minerals
Carbonates
Sample No.:
Sample No.:
Sampling Location and Coal Seam Name:
Chemicals
Table A2 Report on Joint Determination of Microscopic Coal Rock Types and Microscopic Groups Others
Sample No.:
Sample No.:
Single
Microscopic Coal||t t||Rock type
Measurer:
Measurement date:
Sampling location and coal seam name:
Microscopic coal
Rock type
Microscopic coal
Microshell coal
Micro-emotion coal
Micro-bright coal
Micro-dark coal
Micro-emotion coal
Micro-tri-coal
Percentage
Vitrinite
Shellite
Emotionite
Clay minerals
Carbonate
Sulfide
Other minerals
Microscopic components
Groups and minerals||tt| |Other minerals
Percentage
Measurement unit:
Technical person in charge:
Micro coal
Rock type
Micro mineral
Chemical type
Micro mineral
Material type
Percentage
GB/T15590-1995
Continued Table A2
Vitrinite
Exinite
Clay minerals
Molybdenum
Carbonate
Sulfide
Other minerals
Measurer:
Measurement date:
GB/T 15590---1995
Yaofan type
Carbon salt type
Sansuan fern
(A/A)%Laixiang
Saoguanmei
(A/A)%Shenxiang
（A/A)%
100-68
Additional remarks:
GB/T15590—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 is jointly drafted by the Xi'an Branch of the China Coal Research Institute, the Beijing Graduate School of China University of Mining and Technology, China University of Geosciences (Beijing), the Southern Coal Testing Center of the Ministry of Geology and Mineral Resources, and the Laboratory of the Shanxi Coalfield Geology Bureau. The main drafters of this standard are Zhang Xiuyi, Jin Kuili, Pan Zhigui, He Peishou, Ge Yintang, Lu Jie, and Xiao Wenzhao. This standard is entrusted to the Xi'an Branch of the China Coal Research Institute for interpretation. The People's Republic of China
National Standard
Method for determination of microscopic coal and rock types
GB/T15590-1995
Published by China Standards Press
No. 16, Sanlihebei Street, Fuxingmenwai, Beijing
Postal Code: 100045
Tel: 8522112
Printed by China Standards Press, Qinhuangdao Printing Factory, Xinhua Bookstore Distributed by Beijing Publishing House, sold by Xinhua Bookstores in various places. Copyright reserved. No reproduction allowed.
Wood 880×12301/16 Printing sheet 3/4
Word count 14,000 words
First edition November 1995, first printing November 1995, print run 1-2000
Book number: 155066·1-12043
Price 5.00 yuan
Heading 2773900 yuan
heading 2773900 yuan
heading 27739
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