GB/T 15057.11-1994 Determination of particle size of limestone for chemical industry

GB/T 15057.11-1994 Determination of particle size of limestone for chemical industry GB/T15057.11-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination of particle size of limestone for chemical industry,
Limestone for chemical industry-Determination of size
1 Content and scope of application
This standard specifies the method of determining particle size by sieving method. This standard is applicable to the determination of particle size of bulk limestone for chemical industry. 2 Reference standards
GB6003 Test sieve
GB/T15057.1 Sampling and sample preparation method of limestone for chemical industry 3 Summary of method
The percentage of a certain particle size is estimated by visual method. The mass of the sample on or under the sieve is determined by sieving method, and the percentage is calculated. 4 Instruments
4.1 Bench scale (GB335).
4.2 Test sieve: prepared in accordance with GB6003.
150mm sieve: sieve surface thickness 1.5mm, round sieve hole. GB/T15057.11—94
50mm sieve: The effective size of the sieve surface is 500mm×1000mm, the sieve hole is round, and the height of the sieve frame is based on the ore not splashing out during screening. 5 Sampling
The samples used for particle size determination should be taken separately from the ore pile and the belt conveyor. The sampling method is in accordance with GB/T15057.1 Sampling and sample preparation method for limestone for chemical industry. The point and row spacing of the ore pile should be relaxed in proportion, and the belt conveyor should take the entire cross section. The amount of the sample is increased, and the total amount of sampling shall not be less than 500kg.
6 Determination method
The determination of this particle size takes 50~150mm as an example. The other particle size determination methods are the same, only the sieve holes of the corresponding test sieve are changed. 6.1 Visual method
According to the technical index requirements, a batch of products is directly estimated by visual method to measure the percentage of particle sizes less than 50 and greater than 150mm. If there is any objection to the result of the visual method, the sieving method shall be used for determination. 6.2 Sieving method
6.2.1 Determination method of particle size greater than 150mm Weigh all collected samples, take out the ore that may be greater than 150mm in particle size, put it into a 150mm metal circular sieve hole at any angle, and weigh the amount of the material on the sieve. The percentage of particle size greater than 150mm (cz) is calculated according to formula (1): Approved by the State Administration of Technical Supervision on May 5, 1994 214bZxz.net
Formula
Implementation on February 1, 1995
GB/T15057.11--94
-Mass of particle size greater than 150mm, kg;
Where: m—
m—Mass of sample, kg.
6.2.2 Determination of particle size less than 50 mm
Sieve the ore less than 150 mm in 6.2.1 in batches. The mesh size is 50 mm and round. Sieve 20 kg each time. Spread the ore on the sieve surface and sieve horizontally for 1 min. The amplitude is about 0.5 m and the number of times is 15. After all samples are sieved, weigh the amount of the sieve. The percentage of particles less than 50 mm (z) is calculated according to formula (2):
Where: mz——the mass of particles less than 50 mm, kg, m
the mass of a sample, kg.
Additional remarks:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Chemical Industry Mining Design and Research Institute of the Ministry of Chemical Industry. m2
This standard was drafted by the Chemical Industry Mining Design and Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Li Donghao and Xu Xiulan. Standards Authorization Search Network
Various Standards Industries
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