Method for rapidly detecting main component in active lime and passivated lime

Abstract

The invention relates to the field of analytical chemistry and discloses a method for rapidly detecting a main component in active lime and passivated lime. The method comprises the following steps: 1, weighing a proper amount of active lime and passivated lime samples and carrying out a blank test along with the samples; placing the samples into a heating container; adding a proper amount of hydrochloric acid solution; heating till the samples are completely decomposed; cooling a few undissolved substances of the passivated lime sample to the room temperature; after the solution is filled into a volumetric flask to fix volume, respectively extracting two parts of proper amount of test solution; and 2, respectively titrating calcium oxide and magnesium oxide or calcium and magnesium. Theinvention has the characteristics that the sample decomposition is simplified, and a measurement error is reduced and the analysis time is shortened by controlling the titer of EDTA and EGTA titrand within the burette volume range; two separately added indicating agents are prepared into a mixed indicating agent to be added once when the calcium and magnesium or magnesium oxide is directly titrated so as to reduce the operation time; and the final result is obtained by adding the experience correction coefficient in the passivated lime sample.

Description

technical field [0001] The present invention relates to the field of analytical chemistry. Background technique [0002] Active lime is a kind of high-quality lightly burned lime after limestone is calcined at 900℃~1200℃ in a special rotary kiln. In order to maintain the activity of active lime components, the surface of active lime is passivated to obtain passivated lime . They are all indispensable auxiliary raw materials in modern smelting production. [0003] As a slagging agent for steelmaking, active lime has the advantages of shortening the smelting time, improving the purity and yield of molten steel, reducing the consumption of lime and fluorite, and improving the life of the converter lining. All developed countries in the world have adopted active lime for steelmaking, and my country's iron and steel enterprises have gradually used active lime instead of general metallurgical lime, and achieved good benefits. With the increase of iron and steel output and the a...

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Problems solved by technology

[0006] 1. The decomposition of the sample in the determination method of calcium oxide and magnesium oxide in active lime and passivated lime is an alkali fusion method, which takes a long time for analysis and high energy consumption

[0007] 2. The concentration of EDTA, EGTA, and CyDTA standard titration solutions is 0.01mol / L. For the titration of high-content calcium oxide in active lime and passivated lime, if the volume of the titration test solution is 25.00mL, it exceeds the volume of a burette. Titration solution, the volume of the titration test solution is 15.00mL, the titration error is enlarged, and the uncertainty in the analysis and test is increased

[0008] 3. Titration of low-content magnesium oxide with 0.01mol / L CyDTA standard titration solution, the titration milliliter is too small, which increases the uncertainty in the analysis and test

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