This standard specifies the determination of silicon dioxide content in high-purity quartz sand. This standard is applicable to the analysis of various grades of high-purity quartz sand. SJ 3228.4-1989 Determination of silicon dioxide in high-purity quartz sand SJ3228.4-1989 Standard download decompression password: www.bzxz.net
This standard specifies the determination of silicon dioxide content in high-purity quartz sand. This standard is applicable to the analysis of various grades of high-purity quartz sand.

Standard of the Ministry of Machinery and Electronics Industry of the People's Republic of China Determination of silicon dioxide in high-purity quartz sand
1 Subject content and scope of application
1.1 Subject content
This standard specifies the determination of silicon dioxide content in high-purity quartz sand1.2 Scope of application
This standard is applicable to various grades of high-purity quartz sand. Reference standard
SJI3228.2—99 General rules for analysis of high-purity quartz sand. 3 Method summary
SJ3228.4—89
The sample is treated with sulfuric acid and hydrofluoric acid to volatilize silicon dioxide in the form of silicon tetrafluoride. The amount volatilized is the content of silicon dioxide.
4 Reagents
4.1 Hydrofluoric acid: 40% high-grade purebzxZ.net
4.2 Sulfuric acid: 11.
5 Analysis steps
Accurately weigh 1g of the sample after ignition loss, place it in a platinum crucible with constant weight, add a few drops of water to wet the sample, then add 5 drops of 1:1 sulfuric acid and 20ml hydrofluoric acid, heat to dissolve, evaporate to dryness, and move into a muffle furnace. Ignite at 950~1000℃ for 30min, move to a desiccator to cool to room temperature and weigh, and repeat ignition until constant weight. 6 Calculation
Si0（%）=m1=m=×100
Where: m1——the amount of the sample after ignition loss. gm2The amount of the crucible and sample residue after treatment with hydrofluoric acid. gm-—the amount of the sample after ignition loss. g.
Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on March 20, 1989, and implemented on March 25, 1989
Measurement accuracy
The relative standard deviation is less than 5%.
Additional Notes:
SJ3228.4-89
This standard was proposed by the Electronic Standardization Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Jiangsu Xinyi Ahu Stone Powder Factory and the Electronic Standardization Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Shen Xuebin and Liu Chenggou. 2
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