Method for measuring content of aluminum in silicon-calcium alloy

A silicon-calcium alloy and aluminum content technology, applied in the field of element detection, can solve the problems of measurement interference, complex processing methods, and large amount of chemical reagents, so as to reduce instrument detection interference, improve efficiency and accuracy, and reduce types and dosages. Effect
CN113686641APending Publication Date: 2021-11-23PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
Publication Date
2021-11-23

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Abstract

The invention provides a method for measuring the content of aluminum in a silicon-calcium alloy, the method comprises the following steps: only dropwise adding hydrofluoric acid into a sample to be measured for reaction, after the reaction is stopped, heating and evaporating on an electric hot plate, firing at high temperature, then directly adding a flux formed by grinding and mixing anhydrous potassium carbonate and boric acid, melting in a high-temperature furnace, leaching with hydrochloric acid, and fixing the volume, and finally, measuring the content of aluminum by adopting instrument analysis methods such as inductively coupled plasma atomic emission spectrometry and the like. Only hydrofluoric acid is added in the sample pretreatment process so that the use of a large amount of acid is avoided; by utilizing the characteristic that hydrofluoric acid can react with silicon under high-temperature heating to generate a volatile substance silicon tetrafluoride (SiF4), a large amount of interference element silicon in the sample is removed; residues are burned at high temperature, and part of detection interference impurities are removed; residues are directly dissolved with hydrochloric acid after being subjected to high-temperature alkali fusion, and are directly detected after constant volume so that the tedious operation caused by combining a main solution obtained after acid dissolution with a diluent obtained after alkali fusion in the past is avoided.
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Description

technical field

[0001] The invention belongs to the technical field of element detection, in particular to a method for measuring aluminum content in silicon-calcium alloys. Background technique

[0002] Silicon-calcium alloys are mostly used in composite deoxidation, desulfurization, denaturation of non-metallic inclusions, addition of alloying elements, and cast iron production in iron and steel smelting. Other impurity elements in silicon-calcium alloy except aluminum can generally be digested and dissolved under acidic conditions, and the pre-treatment is relatively simple. However, digestion under acidic conditions is not suitable for the pretreatment of impurity element aluminum in silicon-calcium alloys. The common sample pretreatment method is relatively complicated. Generally, it is acid-dissolved first, and a large amount of hydrofluoric acid, hydrochloric acid, nitric acid, perchloric acid, etc. are usually added. , and then acid-dissolve the alkali fusion resid...

Claims

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