Method for determining content of calcium chloride in industrial liquid calcium chloride
A method of determination, calcium chloride technology, applied in the field of analysis and testing, can solve the problems of lack of speed and accuracy, and achieve the effects of short analysis period, expanded measurement range, and reduced sample analysis cost
Pending Publication Date: 2020-09-15
WUKUN STEEL
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Problems solved by technology
[0003] The purpose of the invention of the present invention is: in order to solve the problem that the assay method of calcium chloride content in existing measuring industrial liquid calcium chloride does not have fast, accurate problem, provide a kind of fast method of calcium chloride content in industrial liquid calcium chloride, By introducing atomic absorption spectrophotometry to measure the content of calcium chloride in industrial liquid calcium chloride, it not only achieves the technical effect of anti-interference, accurate and rapid analysis, but also has a measurement range larger than the liquid specified in the national standard GB / T26520-2011 Standard, that is, the measurement range is expanded from 12-40W / % to 2-42W / %, which overcomes the shortcomings of the traditional EDTA measurement method
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[0023] 1. Sample size
[0024] Weigh 0.1165g industrial liquid calcium chloride sample (5 drops, accurate to 0.0001g) in a plastic airtight container;
[0025] 2. Sample preparation
[0026] 2.1. Add 3-4 drops of concentrated nitric acid to the plastic container of 0.1165g industrial liquid calcium chloride sample that has been weighed to dissolve the insoluble matter in industrial calcium chloride until the dissolution is complete, and the obtained test solution is clear and uniform;
[0027] 2.2, the solution of step 2.1 is completely transferred to the 250mL volumetric flask, add 5mL lanthanum chloride solution (La 3+ =50g / L), shake up, obtain the mother liquor of measuring calcium chloride;
[0028] 3. Drawing of calcium chloride calibration curve
[0029] Pipette 0.00, 2.00, 4.00, 6.00, 8.00, 10.00mL calcium chloride standard solution (200ug / mL) into six 100mL volumetric flasks, add distilled water to dilute to the mark, mix well, and then , adjust the absorbance to z...
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Abstract
The invention discloses a method for determining the content of calcium chloride in industrial liquid calcium chloride. The method comprises the following steps: S1, weighing a certain amount of samples, putting the samples into a closed container, adding concentrated nitric acid to dissolve insoluble substances, transferring the product into a volumetric flask, and shaking the flask up to obtaina mother solution; S2, respectively putting a plurality of calcium chloride standard solutions into a volumetric flask, adding a certain amount of lanthanum chloride solution, supplementing distilledwater for dilution to a scale, uniformly performing shaking, and drawing a working curve under the wavelength of 422.7 nm of an atomic absorption spectrophotometer; and S3, under the wavelength of 422.7 nm, performing zeroing with diluted distilled water to determine the absorbance of the mother solution, and finally finding the amount of calcium chloride in the samples from the working curve. According to the method, the content of calcium chloride in the industrial liquid calcium chloride is determined by introducing the atomic absorption spectrophotometry, so that the technical effects of interference resistance, accuracy and rapid analysis are achieved, the measurement range of the method is larger than the national standard, and the defects of a traditional EDTA measurement method areovercome.
Description
technical field [0001] The invention relates to the technical field of analysis and testing, in particular to a method for determining calcium chloride content in industrial liquid calcium chloride. Background technique [0002] The sintering plant of Kunming Steel uses liquid calcium chloride to increase the strength of sinter and reduce screening. The quality of calcium chloride affects the quality of sintered ore. Accurate determination of their content is conducive to determining the economic value of industrial liquid calcium chloride and the formulation of smelting processes. It is a must-test item in the composition analysis of industrial liquid calcium chloride. The national standard method GB / T26520-2011 is to use the classic EDTA complexometric titration method to determine the content of calcium chloride in industrial liquid calcium chloride, but this method cannot completely eliminate the interfering elements, resulting in the use of this standard method to deter...
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IPC IPC(8): G01N21/31G01N1/38
CPCG01N21/3103G01N1/38
Inventor 王鹏辉
Owner WUKUN STEEL