采樣及其注意事項Samplingandprecautions

1、采樣及其注意事項( Sampling and precautions )Peoples Republic of China national standardThis standard applies to commercial coal samples of lignite, bituminous coal, and anthracite from coal, streams, trains, other vehicles and coal heaps from transport planes.1 General Provisions1.1 commercial coal samples

2、represent the average quality of commercial coal. The analysis and test result of commercial coal sample is the basis for checking the quality of commercial coal.1.2 coal samples shall be taken in the coal stream or taken at the top of the transport vehicle and on the coal pile. Sampling should not

3、be the mining of coal gangue, and pyrite or abandon missing.2 sampling toolsAperture mechanical sampling in coal on the coal sampler 2.1When used is the maximum size of the coal mining in * 2.5 3 times, the sampler should be able to coal mining flow section of the coal sample, can fully accommodatet

4、he coal sample, the running speed of the sampler to discard coal samples shall prevail.* sieve the sieve specified by GB477 - 80 coal screening test method; the size of the sieve whose yield is the closest to 5% is called the maximum particle size of this kind of coal.In the coal sampling of the cro

5、ss belt conveyor, the mechanized sampler should be able to extract the whole coal sample of the coal flow.At the top of the carrier sampling, the mechanical sampler shall be able to take the coal sample at the sampling points specified in this standard.At the top of the vehicle, the maximum width of

6、 the product isnot more than 150mm,and the width of the pointed shovel is about 250mm, and the length is about 300mm.3 sampling accuracy3.1 the sampling accuracy of raw coal, screened coal, coking coal and other coal washing products (including coal) shall be determined in accordance with table 1.4

7、unit for analysis and testing4.1 for coking coal and special industrial coal, coal, according to the user (with 1000t + 100t, the same below) for a number of samples as a test unit; other coal by coal, regardless of the user, with 1000t as a group, as a unit of analysis.If the volume of a train exce

8、eds 1000t or less than 1000t, the actual shipment volume can be used as an analytical unit.4.2, when taking the coal sample for export of coal, according to the type of coal or country, the actual volume or quantity of delivery will be regarded as an analytical unit.5 sampling in coal flow5.1 1000t

9、coal, coking coal, coal screening and other coal (including coal) minimum number of sample should be taken according to the production plan, ash, respectively in Table 2 shall be determined, through the effective time and evenly distributed in the coal, coal consumption more than 1000t when the samp

10、le number, by the actual shipments (exports of coal according to the delivery batch or day shipments) how much, according to equation (1) calculated:In M, the actual number of a sample should be collected;The number of sample n provided in Table 2, a;M - actual traffic, t.1000t the amount of coal, a

11、ccording to the actual number of sample number of shipments, according to the numbers provided in Table 2 according to the proportion of decline, but at least not less than those specified in Table 2 of the number of 1/3.5.2 coal in each stream sample weight not less than 5 kg.5.3 in the coal flow s

12、ampling, according to the coal flow, with one or two times to three times the cross-sectional coal flow section to take 1 sample. Two or three times, according to the left or right, middle, and right order, the sampling sites arenot allowed to overlap.In the coal sampling of a cross belt conveyor, t

13、he sampler must be attached to the belt and is not allowed to float to remove the coal stream.6 overhead sampling6.1 on the train take top commercial coal sample, 300t to a train loading amount of coal sample should be taken according to the number and variety of coal is determined. For coking coal,

14、 coal and other coal particle size greater than 100mm,regardless of the size of the wagon, as shown in Figure 1, along the diagonal direction in 1, 2, 3, 4, 5 position according to 5 point cycle take 1 samples; for coal, coal wagons regardless of size screening according to figure 2. Shows, inclined

15、Line direction takes 3 sub samples. Both ends of the slash should be located 1 m from the angle of the car, and the rest of the points must be evenly arranged on the remaining diagonals. The car should be in the same direction.6.2 the amount of coal less than 300t as a test unit, coal, coal mining s

16、hould be the minimumnumber of sample screening for 18; coking coal, other coal (including coal), minimum number of sample size greater than 100mmshould be taken as 6 lump coal. Each car take 1, 3 or 5 samples in the slash. When the amount of coal in 3 and the following car as a test unit, the number

17、 of samples can be taken in excess slash and figure 1 or 2 on the cross.The minimum weight of 6.3 each sample according to the maximum size of commercial coal, determined as specified in Table 3.Manual sampling, the minimumweight as a recovery of the sample weight is less than the standard,You can t

18、ake it again in the place and merge it into a sub sample for the first time.Coal according to appendix B the method to determine the weight of sample.6.4 after the coal is loaded, the sampler shall be inserted immediately by mechanical sampler or pointed shovel. Users need to analyze and check, you

19、can dig to 0.4m below, according to this standard 6.1 and 6.2 requirements sampling.According to the provisions of the 6.5 coal and coal GB477 80 coal screening test method of the sieve size greater than 150mm(including coal gangue, pyrite, the samebelow) more than 5%, the objects on the screen shou

20、ld be GB474 - 83 coal sample preparation method and analysis of crushing dividing the ash. When using commercial coal sample, take no more than 150mm of coal ash, but this kind of commodity coal according to the formula (2) calculation report:A coal sample for screening test shall be carried out in

21、accordance with appendix B.6.6 cars to transport coal, coal can be 1000t not less than 60 and the sample along the diagonal sampling principle, take commercial coal sample.7 coal pile samplingThe number of samples of 7.1 1000t coal as specified in Table2 to determine the amount of coal shortage; 100

22、0t, sample number by the number of actual coal quantity,According to the numbers provided in Table 2 according to the proportion of decline, but not less than half the number provided in Table 2; the number of samples is greater than 1000t coal according to the standard 5.1 formula (1) calculated.7.

23、2 coal heap sampling points, according to the number of samples required, according to the different shape of heap coals are uniformly arranged on the top, waist and bottom or top and bottom parts (the bottom at 0.5m from the ground) at the sampling point, remove the surface layer of 0.2m coal, then

24、 sampling.The minimum weight for each of the 7.3 subsamples according to table 3 and appendix B to determine.7.4 in the coal pile, do not take the export of coal commodity coal samples.8 total moisture coal sampling8.1 of total moisture coal sample can be taken alone, but also in the coal preparatio

25、n process of separation.8.2, take the whole moisture only coal sample.8.2.1 in coal flow sampling, according to the uniform distribution of sampling points, taking at least 10 samples, as the total moisture of coal.The 8.2.2 in the roof of the train should be carried out immediately after sampling,

26、after loading, the method is according to the 5 points along the diagonal cycle (see Figure 1), take 1 samples in each wagon, merged into full moisture coal sample.The 8.2.3 sample weight respectively according to the provisions of Article 5.1 of this standard and the determination of 6.3.8.2.4 a ba

27、tch of coal can also be sampled several times. The time to take the sample number to the results above, the weighted average value as the number of the total moisture of coal.8.2.5 does not take the whole water only coal sample in the coal heap.8.3 in the preparation of coal sample divided commercia

28、l coal sample during the process of water.8.3.1 is governed by GB 474 - 83.A number of coal can be divided into several sub total moisture in coal samples, the determination results of weighted average as the number of the total moisture of coal.8.4 take the total moisture coal sample should immedia

29、tely after sample preparation or load immediate cover tight plastic barrel or galvanized steel drum, and sample preparation as soon as possible. In addition, plastic bags can also be used to seal the sample in full volume as soon as possible.Appendix AVerification of sampling accuracy(supplementary)

30、The A1 of 1000t in coal, coal flow, transport or top coal heap, with 6 samples in the form of sampling, sample number of each sample is provided in Table 2 sample number 1/6, such as the numberof samples should be not divisible by 6, to appropriately increase the number of samples (not reduced) it i

31、s a multiple of 6. Each sample should be staggered into 6 containers. With more than 20% coal ash as an example, according to the provisions of the 2 sample table number is 60, thenFirst, seventh, samples;13.Samples were collectedintofirst sub subSecond, eighth,14.Samples were collectedintosecond su

32、b subsamples;Sixth, twelfth, 18. Samples were collected into sixth sub subsamples.These 6 fractions should be individually separated and analyzed for moisture and ash content. The average of the parallel results without exceeding the difference is used as a result.As of 6 samples of dry basis ash ma

33、ximum value and the minimum value of the difference (range in 4.9A 1.2A (A) for the sample provided in Table 1 accuracy) between (in this case, 9.8 2.4), is that according to the sampling number table 2 provides the sample sampling has reached the table 1 prescribed accuracy; such as range is more t

34、han 4.9A (9.8 cases), according to the provisions of the said the number of sample sampling, not up to the specified sampling accuracy, should increase the number of samples (generally increased first and the required number of 50%), then check according to the above method. As of 6 samples of dry basis ash maximum value and the minimum value of the difference between the (poor) in 4.9A 1.2A (in this case between 9.8 2.4), is that according to the number of samples increased sampling has been reached provided in Table 1 sampling accuracy; if