Method for accurately determining calcium-based desulfurization agent main component

A technology for accurate determination and desulfurization agent, applied in the field of analytical chemistry and physical analysis, can solve the problem that only the total calcium content can be measured

Active Publication Date: 2013-06-05
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 calciu

Method used

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  • Method for accurately determining calcium-based desulfurization agent main component
  • Method for accurately determining calcium-based desulfurization agent main component
  • Method for accurately determining calcium-based desulfurization agent main component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Weigh 0.1g~1.0g, preferably 0.5000g (accurate to 0.0001g), which has been prepared as a desulfurizer sample with a particle size of less than 0.15mm and placed in a closed container. Perform a blank test with the sample and place it in 100mL~ In a 500mL dry volumetric flask with stopper, preferably a 250mL Erlenmeyer flask, add 20-100mL of sucrose solution with a concentration of 100g / L to 300g / L. The amount of sample corresponds to the amount of sucrose solution. When it is small, relatively small or low-concentration sucrose solution should be used to dissolve the sample, preferably 50mL 200g / L sucrose solution. If the sample is not completely decomposed, 10mL 200g / L sucrose solution can be added each time, or Choose other concentration of sucrose solution and amount to dissolve the sample, stoppered and shake until the sample is completely decomposed, filter with quantitative filter paper in a volumetric flask, wash several times to obtain filtrate (1) and sediment (1)...

Embodiment 2

[0103] Weigh 0.1g~1.0g, preferably 0.5000g, and have prepared a desulfurizer sample with a particle size of less than 0.15mm, placed in a closed container, and carry out a blank test with the sample, and place it in a dry capacity of 100mL~500mL with a plug In the bottle, the volumetric flask is preferably a 250mL conical flask, and 20-100mL of sucrose solution with a concentration of 100g / L to 300g / L is added. The amount of sample corresponds to the amount of sucrose solution. When the sample amount is small, a relatively small amount should be used Or dissolve the sample in a low-concentration sucrose solution, preferably 50mL of a sucrose solution with a concentration of 200g / L. If the sample is not completely decomposed, add 10mL of a 200g / L sucrose solution each time, or choose a sucrose solution with other concentrations Dissolve the sample with the amount and stopper, shake it until the sample is completely decomposed, filter it in a volumetric flask with quantitative fil...

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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...

Claims

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Application Information

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IPC IPC(8): G01N5/04G01N31/16G01N1/28
Inventor 邹长东陆娜萍李玲霞年季强刘飞朱春要
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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