T/GZNFS 001.1-2019 Active Group standards

T/GZNFS 001.1-2019 Tungsten slag chemical analysis method Part 1: Determination of tungstate of oxygen content

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 001.1-2019

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Metallurgy

ICS Name: Other non-ferrous metals and their alloys

Publish Date: 2019-12-02

Implement Date: 2019-12-02

Scope

Scope: This part of T/GZNFS 001 specifies the method for determining the tungsten trioxide content in alkali-cooked slag (tungsten slag) produced during the alkali decomposition process of ammonium paratungstate. This part is applicable to the determination of the tungsten trioxide content in alkali-cooked slag (tungsten slag) produced during the alkali decomposition process of ammonium paratungstate. The determination range (mass fraction): 0.50% to 5.00%; Main technical content: The sample is melted and decomposed with sodium peroxide, and the melt is extracted with water to separate tungsten from most of the iron, manganese, calcium, copper, bismuth, niobium, tantalum, cobalt, and nickel. In a hydrochloric acid medium, titanium trichloride reduces tungsten to the five-valent state and forms a yellow complex with thiocyanate. The absorbance is measured at a wavelength of 400 nm using a spectrophotometer.