Some standard content:
Coal Industry Standard of the People's Republic of China
Test method for selectivity of coal core samples
1 Subject content and scope of application
MT 320—93
This standard specifies the coal samples, equipment and test methods for screening, floating, mudding and flotation of coal core samples. This standard is applicable to coal core samples of bituminous coal and anthracite. 2 Reference standards
Test method for coal screening
Test method for coal floating and sinking
GB 478
GB 4757
Test method for flotation of coal preparation laboratory unit
GB6003
Test sieve
GB6004
Metal wire woven square hole mesh for test sieve
China coal selectivity assessment method
MT 109
3 Coal Sample
Method for floating and sinking test of coal powder
Method for screening test of coal powder
Method for mudification test of coal and grinding stone
3.1 When using coal core coal sample as coal sample for screening and floating and sinking test, the collection of coal core coal sample shall comply with the "Regulations for Coal Sample Collection in Coal Resource Exploration", and the quantity requirements are: not less than 5kg for thin coal seam, not less than 7kg for medium and thick coal seam, and not less than 13kg for thick coal seam. 3.2 Take mudification test samples in accordance with the provisions of Article 3.9 of the "Regulations for Coal Sample Collection in Coal Resource Exploration". 3.3 Take a small flotation test coal sample from the product with a particle size of less than 0.5mm after the screening test, and its mass shall not be less than 200g. 4 Main Equipment
4.1 Jaw crusher, the upper limit adjustment range of the discharge port size is 13~50mm. 4.2 Screening equipment
4.2.1 Round hole screens with apertures of 50.25 and 13mm, and shall comply with the provisions of GB60034.2.2 Metal wire woven square hole screens with apertures of 6 and 0.5mm, and shall comply with the provisions of GB6003 and GB6004. 5 Screening test
5.1 Refer to Appendix B for the test process and Appendix C for the test report form. 5.2 Dry the coal sample to air dry state and weigh it (accurate to 0.01kg). 5.3 Sieve the coal sample with a sieve with an aperture of 13mm, and all the materials on the sieve are crushed to less than 13mm with a crusher. The crusher discharge is checked and screened with a sieve with an aperture of 13mm, until all the lumps of coal larger than 13mm are crushed to less than 13mm. 5.4 All materials are screened with apertures of 6, 3 and 0.5mm, and four grades of products are obtained. 5.5 According to user requirements and the number of coal samples, the upper limit of the particle size can also be increased to 50 or 25mm. At the same time, other particle sizes should be adjusted accordingly. Approved by the Ministry of Energy of the People's Republic of China on February 25, 1993 554
Implementation on October 1, 1993
MT 320-93
5.6 Weigh the products of each particle size (accurate to 0.005kg), calculate the yield, and the difference between the sum of the mass of the products of each particle size and the mass of the coal sample before screening shall not exceed 2%, otherwise the test will be invalid. 5.7 Take about 1/4 of the products of each particle size, crush them to less than 3mm, prepare the total sample for testing according to the mass ratio of the products of each particle size, and keep the test samples of this grade.
5.8 Refer to Appendix C for the test items of the total sample for testing. 5.9 The difference between the weighted average ash content of each particle size product and the total sample ash content shall comply with the following provisions: a. When the ash content of the coal sample is less than 20%, the relative difference shall not exceed 15%; b. When the ash content of the coal sample is equal to or greater than 20%, the absolute difference shall not exceed 3%. 5.10 The coal powder screening test shall be carried out in accordance with MT58. 6 Floating and sinking test
6.1 After the total sample is reduced for testing, the products of each particle size are subjected to floating and sinking tests. The floating and sinking test report form shall refer to Appendix D, Appendix E and Appendix F. 6.2 The floating and sinking test is carried out according to the following densities: 1.30, 1.40, 1.50, 1.60, 1.70, 1.80 and 2.00g/cm2. Certain densities may be appropriately increased or decreased according to specific circumstances.
6.3 The preparation of heavy liquid and the test steps shall be carried out in accordance with GB478. 6.4 Weigh (accurate to 0.005kg) the products of each density level and calculate the yield. The difference between the sum of the mass of each density grade product after the floating and sinking test and the mass before the test shall not exceed 2%, otherwise the test is invalid. 6.5 The difference between the ash content of each density grade product and coal slime before the floating and sinking test and the weighted average ash content of each density grade product after the floating and sinking test shall meet the following requirements;
a. When the ash content of the product is less than 15%, the relative difference shall not exceed 20%; b. When the ash content of the product is equal to or greater than 15%, the absolute difference shall not exceed 3%. 6.6 The floating and sinking test of coal powder shall be carried out in accordance with MT57.
6.7 While doing the floating and sinking test, the density composition shall be determined by coal petrology method. When the results of the two methods are contradictory, the floating and sinking test results shall prevail.
Ansler mud test
Performed in accordance with MT109.
Comparable flotation test of coal powder
Performed in accordance with the provisions of GB4757.
A1 Subject content and scope of application
MT 320--- 93
Appendix A
Method for petrographic determination of density composition of coal samples (supplement)
This standard specifies the main instruments and tools for petrographic determination of density composition of coal samples, formulates methods and requirements, specific steps for determination of density composition and calculation method of results.
This standard is applicable to bituminous coal and anthracite.
A2 Method summary
Crush the coal sample to less than 1.5mm and make a pulverized coal sheet. Under a reflected light microscope, take particles as statistical units to count the contents of three groups of microscopic organic components and various minerals, and calculate the density composition of the coal sample according to the prescribed calculation method. A3 Reference standards
GB478 Coal floating and sinking test method
GB 6948 Coal vitrinite reflectance determination method GB8899 Coal microscopic component grouping and mineral determination method MT116 Coal rock analysis sample preparation method
A4 Terminology
A4.1 Effective particles: particles pressed by the intersection of the eyepiece crosshairs during the process of selecting points at equal intervals under the microscope. A4.2 Measuring point: the intersection of the scale of the eyepiece micrometer and the main scale. A4.3 Step distance: the unit spacing of the moving ruler moving along the measuring line according to the specified distance. A5 Instruments and main tools
A5.1 Reflected light microscope: magnification not less than 450 times. A5.2 Eyepiece: select a 10x eyepiece with a micrometer. A5.3 Objective lens: a dry objective lens of about 50 times can be selected. A5.4 Electric counter: with a 0.2mm moving step stage moving ruler. A5.5 Computer: memory of not less than 8×103 bytes. A5.6 Installation equipment: including slides, cement, and flatteners. A6 Preparation of pulverized coal optical slices
A6.1 Coal rock and coal samples are crushed to less than 1.5mm and pressed into pulverized coal optical slices with a diameter of not less than 20mm after reduction. A6.2 The grinding of pulverized coal optical slices shall be carried out in accordance with the provisions of MT116.1. A6.3 The quality of pulverized coal optical slices shall meet the requirements of Chapter 3 of GB8899. A7 Preliminary determination
A7.1 Determine the content of microscopic components and various minerals of coal rock in accordance with GB8899. A7.2 Determine the average maximum reflectivity of the vitrinite group in accordance with GB6948. 556
A8 Determination of density composition
MT 320-93
A8.1 Provisions on the line spacing and step spacing of the moving ruler and the number of effective particles. A8.1.1 The line spacing of the moving ruler should be 1.5mm. A8.1.2 The step spacing of the moving ruler should be 0.2mm. A8.1.3 The number of effective particles on the pulverized coal optical sheet should be no less than 350. If it is insufficient, an additional pulverized coal optical sheet should be added. A8.2 Measurement steps
A8.2.1 Adjust the eyepiece micrometer to a position perpendicular to the moving direction of the moving ruler step. A8.2.2 Determine the distance between measuring points on the micrometer, and the distance between measuring points should be 0.01mm. A8.2.3 Move the top end of the pulverized coal optical sheet to the eyepiece crosshairs and determine the first line of measurement. A8.2.4 Starting from one end of the measurement line, use the counting method to determine the cumulative number of measurement points of each type of component, including vitrinite, inertinite, exinite, clay, quartz, calcite, pyrite, and siderite, on the effective particles pressed by the eyepiece micrometer. If the measuring point is on the boundary of two or more components, select the components that appear in the quadrant without boundary lines from the upper right quadrant in clockwise order with the measuring point as the center.
A8.2.5 After measuring a valid particle, enter the measured data into the computer or record it on the record sheet, and return the counter to zero, and measure the next valid particle according to the specified line spacing and step distance until the whole piece is measured. The additional pulverized coal optical slice should also be measured in full. A8.2.6 Measure the same pulverized coal optical slice twice under the same conditions. A8.2.7 The format of the record sheet is shown in Table A1.
Table A1 Coal sample density composition Coal petrology determination method original record sheet Sample delivery unit:
Sample delivery location:
Sample delivery number:
Particle sequence
Vitrinite
1 Inertinite
Vitrinite maximum reflectivity:
Laboratory number:
Determination date:
Exinite
Calcite
Pyrite
Siderite
A8.4 Result calculation
MT320—93
A8.4.1 Determination of organic matter density in particles: According to the average maximum reflectivity of the vitrinite of the coal sample and the content of inertinite in the particles, the organic matter density of the particles is determined according to Table A2.
, average maximum reflectivity of vitrinite, %
density,
E+g/cm2
vitrinite content, %
30～70
Relationship table of average maximum reflectivity of vitrinite and organic matter density 0.5~
The density of coal particles is calculated according to formula (A1):
Where: ei—
density of coal particles, g/cm2,
effective particles Density of organic matter in effective particles, g/cm2; 0.85~
C number of measurement points or content of organic matter in effective particles, %(V/V), 1.50~
(Al)
M—number of measurement points or content of various minerals in effective particles, %(V/V);
density of clay, quartz, calcite pyrite, siderite, g/cm2, see Table A3. A8.4.3 Ash content of effective particles is calculated according to formula (A2): C, p2X 0. 025 +
Where: Aa——dry basis ash content of effective particles, %; SM..m..F,
F,—ash inclusion coefficient of clay, quartz, calcite, pyrite, see Table A3. ——ash inclusion coefficient of organic components.
Density and ash inclusion coefficient of common minerals in coal
Mineral category
Density, g/cm2
Ash inclusion coefficient
4The sulfur content of pyrite in effective particles is calculated according to formula (A3): A8.4.4
Calcite
Pyrite
（A2)
Siderite
MT 320--93
M·pmX0.53
Where: S, is the sulfur content of pyrite in effective particles, %; 0.53---F (m/m) is the sulfur content in pyrite, %. A8.5 Data processing and presentation
(A3)
Divide the measured coal particles into eight levels according to their density values, namely -1.3, 1.3~~1.4, 1.4~1.5, 1.5~~1.6, 1.6~~1.7, 1.7~1.8, 1.8~2.0.+2.0 (the number of density levels and the size of the difference can be changed according to actual needs). Calculate the yield of each level according to the mass of each coal particle, calculate the ash content of each level according to the weighted average method, and calculate the sulfur content of pyrite in each density level when the pyrite content in the coal sample is greater than 1%.
Merge the density composition results of the two measurements that meet the accuracy requirements by weighted method, and fill in the density composition table according to the format of Appendix F. A9 Precision
The density composition measured twice on the same pulverized coal sheet is plotted into a selectivity curve according to Appendix A of GB478. At the same ash point, the absolute difference in the separation density ±0.1 yield should not be greater than 10%. 559
50(25)~13
Legend:
Father Crushing
Blending
MT 320—93
Appendix B
Flow chart of coal core and coal sample screening test
(reference)
Coal core baking sample
13(50,25)
-13(50,25）
Test sample at this level
Total test sample
Small subsample
First small flotation sample
Richun sedimentation sample
Coal sample number:
Well field (exploration area)
Sample quality:
Sampling date:
Test itemswwW.bzxz.Net
50(25)~13
MT 320-93
Test report
(reference)·
Screening test report
Test date:
Coal seam:
Appearance characteristics of coal sample:
Date of receipt of coal sample:
Test results of total screening sample
Weight of coal sample before screening, kg
Drilling number:
Colloid layer index
Cumulative on sieve, %
Coal sample number:
Coal sample particle size:
Weight of coal sample before test:
Density level
1.30~1.40
1. 40~~1.50
1.50~1.60
1.60~1.70
1.70~1.80
1.80~2.00
MT 320—93
Appendix D
Floating and sinking test report
(reference)
Floating and sinking test number:
Production rate of this level
Percentage of this level
Test date:
Percentage of total samples
Cumulative, %
Coal sample number:
Density level, g/cm2
1.30~1.40
1.40~~1.50
1.50~1.60
1. 60-1.70
1.70~～1.80
1.80~~2.00
MT.320--93
Appendix E
Screening float and sink test comprehensive report form
(reference)
13~6mm
Yield, %
Accounting for this levelAccounting for the whole sample
Yield, %
Accounting for this levelAccounting for the whole sample
Yield, %
Accounting for this levelAccounting for the whole sample
13~0.5 mm
Yield, %
Aa, %
Percentage of this gradePercentage of the whole sample
Coal sample number:
Density level
1.30~1.40
1.50～1. 60
1.60~1.70
1.70~1.80
1.80~2.00
Additional instructions:
MT320—93
Appendix F
13 Comprehensive table of floating and sinking tests of raw coal with particle size of 50.25~0.5mm (reference)
This standard is proposed by China Coal Research Institute. Float
Yield, %
Ash content, %
This standard is drafted by Tangshan Branch of China Coal Research Institute. Participating drafting units: China Coal Geology Bureau and Jiangxi Coal Geology Research Institute. Calculation
Yield, %
Drafters of this standard: An Wenhua, Yuan Sanwei, Li Changkui, Wang Ying, Zhang Shuqin, Long Jiacan. 564
Ash content, %
Sorting density
±0.1g/cm2
1Overview
Coal core sample selectivity test method
(MT32093)Explanation
(An Wenhua and Li Changkui, Tangshan Branch of China Coal Research Institute) Coal core sample is the coal sample taken from the coal core of the borehole according to regulations, so it is also called borehole coal sample. During the exploration stage of the mining area, some coal seams are buried deep, and there are no production mines in the mine field, so it is impossible to take production coal samples for selectivity testing. In this case, the only feasible method is to use coal core samples, but the small number of coal core samples cannot meet the requirements of GB477 and GB478 "Coal Screening Test Method" and "Coal Flotation Test Method" standards for coal sample weight. Therefore, it is necessary to formulate a practical selectivity test method based on the characteristics of coal core samples.
Some testing units are accustomed to calling the selectivity test of coal core samples a "simple selection test", which is not scientific and easy to cause misunderstanding. In fact, it is a more difficult test and requires more careful operation. As early as the 1960s and 1970s, my country's coalfield geology departments began to conduct core coal sample selectivity tests. The "Coal Sample Collection Procedures for Coal Resource Exploration" promulgated in 1979 made provisions for core coal sample selectivity tests. All coalfield geological research institutes or central test (chemical) laboratories carried out this work and accumulated practical experience. In early 1981, the Coalfield Geology Bureau of the Ministry of Coal Industry required the competent departments to arrange for the formulation of core coal sample selectivity test method standards. Entering the 1980s, especially after the promulgation of the revised "Coal Sample Collection Procedures for Coal Resource Exploration" in 1987, all relevant departments conducted a large number of core coal sample selectivity tests and accumulated rich experience, which provided a good foundation for the formulation of industry standards. According to the arrangement of the former China Coal Mine Corporation (88) China Coal General Technology No. 68, the Tangshan Branch of the China Coal Research Institute was responsible for drafting the core coal sample selectivity test method standards, and the China Coalfield Geology Bureau was the cooperative unit. In October 1989, we proposed a draft standard for discussion, and took the opportunity of two meetings of the coalfield geological system (coal quality testing) (October in Hangzhou and November in Xuzhou) to conduct serious discussions. On this basis, the drafting unit went to the coalfield geological departments in Shanxi, Inner Mongolia, Ningxia, Henan, Jiangxi, Shandong, Hebei, and Eastern Mongolia to conduct research, widely solicit opinions, collect data, and complete the "Draft for Soliciting Opinions". The draft for soliciting opinions was sent to 75 units and received overwhelming approval. Some units also suggested that in the design specifications or special texts, it should be formally stipulated that the selectivity test data of coal core and coal samples can be used in the design of coal preparation plants. The "Draft for Review" was completed in November 1991, passed the review in December, and the "Draft for Approval" was completed in 1992. In 1993, MT320-93 "Coal Core and Coal Sample Selectivity Test Method" was officially released and implemented. 2 Main Articles
2.1 Coal Sample Quantity
3.1 The provisions on the number of coal samples are consistent with the "Regulations on Coal Sample Collection for Coal Resource Exploration". The practice of many units has confirmed that the weight of general borehole coal samples can meet the requirements. In order to ensure the accuracy of the test, the exploration team should request and increase the number as much as possible. 2.2 The use of jaw crushers in Article 4.1 is based on the comparability of data obtained from different tests. Because jaw crushers cannot crush all the particles below 13mm at one time, the provisions for inspection and screening are added (Article 5.3). 2.3 Regarding the test process and preparation of the total sample for testing, the test process can be implemented in accordance with Appendix B. There are two situations for the preparation of the total sample for testing: one is the provisions of this process, that is, the preparation of each particle size by screening, for example, the Inner Mongolia Coalfield Geological Science Institute does this. The second situation is to shrink the total sample for testing before screening, for example, the Shanxi Coalfield Geological Science Institute does this. Most units will not prepare a total sample for testing when the coal sample is too small. In order to make the data complete and scientific, this standard stipulates that a total sample for testing is required when the sample is less than 13kg. The method is as specified in Article 5.7.
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