T/GZNFS 001.3-2019 Active Group standards

T/GZNFS 001.3-2019 Chemical Analysis Methods for Tungsten Slag - Part 3: Determination of Silicon Content

T/GZNFS 001.3-2019

Publish Date: 2019-12-02 Implement Date: 2019-12-02 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/GZNFS 001.3-2019

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Metal chemical analysis methods

ICS Name: Other non-ferrous metals and their alloys

Publish Date: 2019-12-02

Implement Date: 2019-12-02

Scope

Scope: This part specifies the method for determining the silicon content in the alkali-cooked slag (tungsten slag) produced during the production process of ammonium paratungstate. This part is applicable to the determination of silicon content in the alkali-cooked slag (tungsten slag) produced during the production process of ammonium paratungstate. The determination range (mass fraction): 2.00% to 6.50%; Main technical content: The sample is melted with potassium metasulfate, and the silicon is separated from most other metal ions in the form of silicon dioxide. Then, it is melted with sodium hydroxide in a medium of hydrochloric acid and sulfuric acid to eliminate the interference of phosphorus and arsenic polyacids. After the silicon forms silicon-molybdenum polyacids, ascorbic acid is reduced, and the absorbance is measured at a wavelength of 650nm on a spectrophotometer to calculate the silicon content.