Method for accurately determining calcium-based desulfurization agent main component

Abstract

The invention relates to a method for accurately determining calcium-based desulfurization agent main component. The method comprises the steps that: 1, a proper amount of a desulfurization agent sample is weighed, and is placed into a container bottle; a proper amount of a sucrose solution is added; the bottle is plugged and oscillated until completely decomposed; the material is filtered, such that a filtrate (1) and a precipitate (1) are obtained; 2, the precipitate (1) and the filtering paper are placed in a heating vessel; a proper amount of an acetic acid solution is added; the mixture is heated until the sample is completely dissolved; filtering is carried out, such that a filtrate (2) and a precipitate (2) are obtained; 3, the precipitate (2) and the filtering paper are added into the heating vessel; a proper amount of a mixed acid solution is added; the mixture is heated until the solution shows an earth yellow color; salt is dissolved, and heating is continued until the mixture is slightly boiling; the mixture is diluted and filtered, such that a filtrate (3) is obtained; 4, the filtrates are respectively transferred into volumetric flasks, and volumes are metered; two parts of proper amounts of the samples are fetched; and 5, combined with chemical analysis and thermal gravimetric analysis, true and valid calcium oxide content in the desulfurization agent can be determined, and the contents of calcium hydroxide and calcium carbonate which severely affecting desulfurization performance can be determined.

Description

Technical field [0001] The invention provides a method for accurately determining the main components of a calcium-based desulfurizer, and belongs to the fields of analytical chemistry and physical analysis. Background technique [0002] Except for some special steel grades, sulfur is a harmful impurity element in steel. Its main hazards include: 1) Sulfur is easy to cause hot embrittlement; 2) Sulfur is easy to segregate at the grain boundary, leading to embrittlement of the grain, and serious impact The ductility and low-temperature impact toughness of the steel; 3) MnS inclusions become thin strips after hot rolling, and microcracks often appear at the inclusions, resulting in unqualified ultrasonic flaw detection, and also seriously affecting the performance of the steel plate in the non-rolling direction; 4) MnS inclusions are the origin of steel plate stress corrosion cracking and hydrogen induced cracking (HIC). In addition, sulfur also has a significant impact on the wel...

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Problems solved by technology

[0006] For example, the patent authorization announcement No. CN101598673B discloses "a method for the simultaneous determination of primary and secondary quantities of calcium-based desulfurizers and impurity elements". This patented technology uses microwave digestion to measure calcium in samples, but it can only measure total calcium. content;

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