Method for determining content of silicon and calcium in silicon-calcium line

Abstract

The invention discloses a method for determining the content of silicon and calcium in a silicon-calcium line. The method comprises the following steps: 1, shearing a silicon-calcium line sample; 2, adding dilute acetic acid into the silicon-calcium wire sample to be dissolved till no bubble is generated, and taking out an iron sheet on the surface of the silicon-calcium wire, cleaning and drying; 3, filtering the solution in the step 2, putting a filtered first insoluble substance and filter paper into a drying oven at 120 DEG C, drying for 1 hour, cooling, weighing the mass of the first insoluble substance, and recording the mass of the first insoluble substance as M3; 4, adding the first insoluble substance in the step 3 into diluted hydrochloric acid to be dissolved without bubbles, putting a filtered second insoluble substance and filter paper into an oven at the temperature of 120 DEG C to be dried for 1 h, and after cooling, weighing the mass of the second insoluble substance, and marking the mass as M4; and step 5, calculating the content of silicon and calcium in the silicon-calcium line according to a gravimetric method. According to the determining method, the problem that the content of silicon and calcium is difficult to accurately determine due to the fact that the silicon-calcium line is difficult to strip is solved through the selectivity of different substances to the dissolved acid, and the method is simple, rapid and high in accuracy.

Description

Technical field [0001] The present application relates to the field of metallurgical chemical detection and analysis, and in particular, to a method of determining silicon calcium content in silicon calcium lines. Background technique [0002] Silicon calcium lines are built-in wiring made of silicon calcium alloy. Silicon calcium lines are usually added to the steel water as an additive, where silicon elements are not only strong deoxidation capabilities, but also have good deoxidation discharge functions. Metal calcium removal can satisfy the deoxidation, desulfurization, change impurity form, and promote impurities, and improve the tunability of molten steel. [0003] In the prior art, the silicon content in silicon calcium lines typically uses industry standard YB / T 5312-2016 << Silica calcium alloy silicon content determination of hydrorate dehydration weight method >>, but considering that the operation step is too complex, affecting Detection efficiency. The ...

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Problems solved by technology

However, in the scheme described in patent CN108663476A, water and calcium react to form calcium hydroxide wrapped on the surface of metallic calcium, resulting in a slow reaction, and the determination of calcium adopts the method of EDTA complexometric titration, which has serious titration interference, difficult observation of the end point, and unsatisfactory effect.

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