Determination method of total sulfur in fluorite

Abstract

The invention relates to a method for determining total sulfur in fluorite. The method comprises a step of sample drying, a step of sample dissolving, a step of working curve drafting and a step of the determination of sulfur in a sample solution. The determination method has the advantages of simple operation, less application amounts of reagents and the sample, and short detection measure time, and can satisfy rapid and accurate detection requirements; and an acid dissolving solution composed of nitric acid, hydrofluoric acid and perchloric acid adopted in the invention realizes the dissolving of sulfur in fluorite at a low dissolving temperature, and effectively reduces the overlapping and cross interferences of impurity elements in fluorite to the spectrum, so the sensitivity is high, the measure accuracy and the measure precision are high, and the measure consistency of fluorite ores in different regions and having different types is good.

Description

technical field [0001] The invention belongs to the technical field of accurate measurement and detection, and more specifically, the invention relates to a method for determining total sulfur in fluorite. Background technique [0002] Fluorspar, also known as fluorspar, is mainly composed of CaF 2 , can reduce the melting point of refractory substances, promote the flow of slag, and make the separation of slag and metal good, so it is widely used as a flux in iron and steel smelting and ferroalloy production processes. Since the sulfur element in the steel material will cause the hot brittleness of the steel, reduce the mechanical properties of the steel, and also damage the corrosion resistance and welding performance of the steel, the fluorite ore for smelting has strict restrictions on the sulfur content. Not higher than 0.3%. At present, chemical analysis methods are mostly used in the determination of sulfur content in fluorite, but their accuracy and precision are n...

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Problems solved by technology

For this reason, we carried out research on measuring the content of sulfur in fluorite by ICP-AES method, but we found that there are many impurity elements in fluorite, and the content of impurity elements in different regions and types of ores in fluorite ore and the types are different; and the acid used when decomposing the sample in the prior art is usually the highly soluble acid solution system of hydrochloric acid-nitric acid-hydrofluoric acid-perchloric acid, because the content of impurity elements after dissolution is more, different The characteristic spectral lines of impurity elements cross and overlap each other, which affects the accuracy and consistency of sulfur element measurement results

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