HG 2957.3-1984 Determination of adsorbed water content in alumite ore analysis samples Gravimetric method HG2957.3-1984 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Alunite ores-Determination of hygroscopic moisture content in analytical samples-Gravimetric methodbzxz.net
Alunite ores-Determination of hygroscopic moisture content in analytical samples-Gravimetric methodScope of application
This standard specifies the determination of hygroscopic moisture content in alunite ores by the drying weight loss weight method. 2Related standards
GB4581.1~84 "General rules for analysis of alunite ores". GB4581.2-84 "Methods for sampling and preparation of alunite ores for analysis". 3Method summary
UDC 549.762
GB 4581.384
Weigh 200 g of sample that passes through a 4-mesh standard sieve and dry it at 105-110℃ for ten minutes. Calculate the adsorbed water content based on the weight loss. 4 Instruments and apparatus III
4.1 Half a day, weigh 1000 grams, sensitivity 0.01 grams. 4.2 Drying oven: with automatic temperature controller.
4.3 Sample container: culture dish or large surface dish with a first diameter of 150 mm. 5 Determination procedure
Weigh 200 grams of sample for determination of adsorbed water content (weighed to 0.1 grams), and evenly spread it in a sample container that has been constant weight. Place it in an oven at 105~110℃: dry for 2 hours (gently stir it with a glass rod after drying for 1 hour). Take it out and weigh it after cooling, and then dry and weigh it again, until the difference between the two weighings is no more than 0.1 grams. 6 Expression and calculation of results
The white content (X,) of adsorbed water (H,O-) is calculated according to the following formula: X=
Wherein: G
The weight of the sample and sample container before drying, g! + The weight of the sample and sample container after drying, g, W
The weight of the sample, g.
Promulgated by the National Bureau of Standards on July 20, 1984
Implemented on June 1, 1985
Tolerance
Additional notes:
Absorbed water content, %
GB 4581.3--
Allowable (absolute value), %
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China and is under the jurisdiction of the Chemical Industry Design and Research Institute of the Ministry of Chemical Industry. This standard is drafted by the Chemical Industry Design and Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Cheng Maogai.
From the date of implementation of this standard, the former Ministry of Chemical Industry standard HG1-353-66 "Uniform Analysis Method for Alum Stone" will be invalid.
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