This standard specifies the sampling and sample preparation methods for limestone used in chemical industry. This standard applies to the sampling and preparation of analytical samples of limestone used in chemical industry. GB/T 15057.1-1994 Sampling and sample preparation methods for limestone used in chemical industry GB/T15057.1-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Methods of sampling and preparing limestone for chemical industry1 Subject content and scope of application
This standard specifies the sampling and sample preparation methods for limestone for chemical industry. This standard applies to the sampling and preparation of analytical samples of limestone for chemical industry. 2 Reference standards
GB/T4650 Vocabulary for sampling of industrial chemical products GB/T6678 General principles for sampling of chemical products
3 Sampling methods
3.1 Ore pile sampling
GB/T15057.1—94
The sampling point should be no less than 0.3m from the top and bottom, and no less than 0.2m from the surface. The sample size of each point taken from the same batch should be similar. 3.1.1 For ores less than 1000t
The sampling volume should not be less than 0.02% of the total amount. The row and point spacing shall not exceed 2.5m, evenly distributed on the surface of the ore pile, and incremental samples shall be taken at the intersection of the row and point spacing.
3.1.2 For ore greater than 1000t
The sampling volume shall not be less than one hundred thousandth. The row and point spacing shall not exceed 3.5m, evenly distributed on the surface of the ore pile, and incremental samples shall be taken at the intersection of the row and point spacing.
3.2 Sampling by car and train
The incremental samples taken at each point in the same batch shall be similar. 3.2.1 One car is a sampling unit. The minimum number of sampling units selected from the number of cars for each batch of ore shall be processed according to Table 1. The selected sampling units shall be randomly distributed with the total number of cars. 3.2.2 The sampling points shall be no less than 0.3m away from the car wall and bottom, and no less than 0.2m away from the surface. 3.2.3 For automobile carriages, sample increments shall be taken from 5 points according to Figure 1. For train carriages of 30t, sample increments shall be taken from 8 points according to Figure 2. For 50 or 60t, sample increments shall be taken from 11 points according to Figure 3.
Table 1 Provisions for the number of sampling units
Number of units for overall materials
Number of selected units
All units
Approved by the State Bureau of Technical Supervision on May 5, 1994
Number of units for overall materials
82~101
102~125
Number of selected units
Implemented on February 1, 1995
Number of units for overall materials
126~151
152~181
182~216
217~254
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3.3 Ship sampling
GB/T 15057.1—94
Continued Table 1
Number of units selected
Number of units of overall material
297~343
344~394
395~450
451~512
Number of units selected
The sampling point should be no less than 0.3m from the ship wall and no less than 0.2m from the surface. The amount of each point sample taken from the same batch should be similar. 3.3.1 For ships less than 1000t
The sampling amount should not be less than 2/100,000. The row spacing and point spacing should not be greater than 1.5m, and the samples should be evenly distributed on the surface of the ore in the hold. The sample should be taken at the intersection of the row spacing and the point spacing.
3.3.2 For ships greater than 1000t
The sampling amount should not be less than 1/100,000. The row and point spacing shall not exceed 2.0m, and the samples shall be evenly distributed on the surface of the ore in the hold. Samples shall be taken at the intersection of the row and point spacing.
3.4 ​​Belt conveyor sampling
The sample sizes of the same batch shall be similar.
3.4.1 Sampling shall be conducted every hour, and the sampling amount shall be 2/100,000 of the belt conveyor throughput per hour. 3.4.2 Sampling can be conducted at any section of the belt conveyor. Three sample points shall be taken continuously and randomly on the cross section of the belt conveyor each time.
3.4.3 For ore with a transport volume of less than 4 hours, the sampling times of the belt conveyor cross section shall be no less than 6 times, and for ore with a transport volume of less than 2 hours, no less than 4 times.
4 Sample preparation
4.1 The samples of each batch shall be mixed. 4.2 The mixed samples shall be crushed, pulverized, ground, etc. Each step shall be sieved, mixed and divided by quartering. Each reduction should be carried out according to the following formula:
Where: Q is the minimum reliable mass of the sample, kg, d is the maximum diameter of the sample particles, mm,
K is the uniformity coefficient of the ore, and limestone is 0.1. 4.3 After all the samples prepared in 4.2 pass through the 1mm sieve, they are reduced to 0.2kg, ground and all pass through the 125μm sieve, and then divided into two equal parts by quartering method, and packed in two clean and dry ground-mouth bottles, sealed and marked with: production unit name, product name, grade, batch number, sampling personnel and sampling date.
GB/T15057.1-94
One bottle is a laboratory sample, which is sent to the laboratory for inspection, and the other bottle is a sample for re-inspection in case of disputes in the future. The sample shelf life is two months.
Additional Notes:
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Chemical Industry Mine Design and Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Chemical Industry Mine Design and Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Li Donghao and Xu Xiulan. Standard Search
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