This standard was first issued in 1981. This standard replaces GB/T 2448-1991 from the date of implementation. This standard specifies the determination of urea particle size by sieving method. This standard applies to the determination of urea particle size synthesized from ammonia and carbon dioxide. This standard applies to the determination of sulfate content in industrial urea synthesized from ammonia and carbon dioxide. The main technical difference between this standard and GB/T 2448-1991 is that the particle size range is changed from one to four. This standard is Part 7 of GB/T 2441 "Urea Determination Method". GB/T 2441.7-2001 Urea Determination Method Determination of Particle Size Sieving Method GB/T2441.7-2001 Standard Download Decompression Password: www.bzxz.net

GB/T2441.7---2001
This standard is a revision of GB/T2448-1991 "Determination of urea particle size by sieving method".
The main technical difference between this standard and GB/T2448-1991 is that the particle size range is changed from one to four. This standard is Part 7 of GB/T2441 "Determination of urea method". GB/T2441 also includes the following parts:
GB/T 2441.1--2001
Part 1
Part 2GB/T2441.2-2001
Part 3GB/T2441.3-2001
Part 4GB/T2441.4--2001
Part 5GB/T2441.5--2001
Part 6
Part 8
GB/T2441.6--2001||tt| |GB/T2441.8--2001
Part 9 GB/T2441.9—2001
Urea determination method
Urea determination method
Urea determination method
Urea determination method
Urea determination method
Urea determination method
Urea determination method
Urea determination method
This standard shall replace GB/T2448—1991 from the date of its implementation. This standard is proposed by the State Bureau of Petroleum and Chemical Industry. Determination of total nitrogen content
Determination of diammonium content Spectrophotometric method
Determination of water content Karl Fischer method
Determination of iron content Spectrophotometric method Determination of alkalinity Volumetric method
Determination of water-insoluble matter content Gravimetric method
Determination of sulfate content Visual turbidimetric method
Determination of methylene diammonium content Spectrophotometric method This standard is owned by the National Technical Committee for Standardization of Fertilizers and Soil Conditioners and is responsible for interpretation. Drafting units of this standard: National Fertilizer Quality Supervision and Inspection Center (Shanghai), PetroChina Urumqi Petrochemical Company Fertilizer Plant, Sinopec Jiujiang Branch, Hainan Fudao Chemical Co., Ltd. Main drafters of this standard: Zhang Qiuzhen, Li Xianjia, Yang Jiqun, Jiang Jianxin, Guo Zu. The clothing standard was first issued in 1981.
National Standard of the People's Republic of China
Determination of urea
Determination of particle size-Sieve method
Determination of urea--
Determination of particle size-Sieve method This standard specifies the determination of urea particle size by sieving method. This standard is applicable to the determination of urea particle size synthesized from ammonia and carbon dioxide. 2 Referenced standards
GB/T 2441.7--2001
Replaces GB/T2448-1991
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T6003.1--1997 Metal Wire Mesh Test Sieve (eqvISO3310-1:1997) 3 Method Summary
Use sieving method to separate urea into different particle sizes, weigh and calculate the mass fraction. 4 Instruments
4.1 Test sieves with apertures of 0.85mm, 1.18mm, 2.00mm, 2.80mm, 3.35mm, 4.00mm, 4.75mm and 8.00mm (R40/3 series in GB/T6003.1-1997), with sieve cover and chassis; 4.2 Balance with a sensitivity of 0.5g;
4.3 Oscillator, which can oscillate vertically and horizontally. 5 Analysis Steps
5.1 According to the material to be tested, select a set of sieves with a corresponding range according to Table 1 in GB2440-2001. 5.2 Stack the sieves in order of aperture size (large on top, small on bottom), install the bottom plate, weigh about 100g of laboratory sample (accurate to 0.5g), place the sample on the stacked sieves, cover the sieve cover, place it on the oscillator, clamp it, and swing for 3 minutes. Weigh the sample that passes through the large-aperture sieve but not through the small-aperture sieve. The particles caught in the sieve holes are counted as not passing. 6 Expression of analysis results
The sample particle size (X) is expressed as mass fraction (%) and is calculated as follows: m×100
In the formula; mt—…The mass of the sample that passes through the large-aperture sieve but not through the small-aperture sieve, g; m --The mass of the sample, g.
The obtained result is expressed to one decimal place. bzxz.net
Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on July 26, 2001 9.1
Implementation from January to January 2002
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