Method for measuring content of diboron trioxide in casting powder

Abstract

The invention relates to a method for measuring the content of the diboron trioxide in casting powder in the smelting technology, which comprises the following steps of: 1. weighing 0.1-1g of sample accurately to 0.0002g, adding the constant quantity of the hydrochloric acid, the hydrogen nitrate and the hydrofluoric acid, adding 0.5-2.0g of mannitol into a beaker, and heating until that the sample is completely dissolved; 2. respectively preparing at least four parts of working curve standard solution for measuring the content of the diboron trioxide in volumetric flasks by the boron standard solution under the same acid medium; and 3. selecting the analysis spectral line of the boron in the medium on the inductively coupled plasma spectrometer (ICPS), measuring the spectral intensity of the boron in the standard solution and the test solution of the working curve at the same time, and computing an analysis result by a computer by means of autoregression. The method dissolves the sample by mixing the hydrofluoric acid with the other acids, and leads the sample to be complexed with the boron by adding the mannitol to lead the boron not to be volatilized and not to be completely decomposed, thereby being applied to measuring the diboron trioxide in the casting powder with the mass fraction within the range from 0.005% to 20%, and being fast in measuring speed and high in accuracy.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to a method for measuring diboron trioxide in mold slag in a smelting process. Background technique [0002] The diboron trioxide in the mold flux in the smelting process determines the viscosity of the mold flux when it melts. At present, the content of diboron trioxide in mold flux is required to be 2% to 5%. If the content of diboron trioxide in the mold flux is too low, the effect of reducing the viscosity of the mold flux cannot be achieved; if the content of diboron trioxide in the mold flux is too high, the temperature of the mold flux will be significantly reduced, and the viscosity will also be reduced. The active metal aluminum in the steel reacts into the steel and is harmful to the steel. Therefore, the accurate determination of diboron trioxide in mold flux is of great significance to the scientific research and actual production of mold flux. [0003] In the actu...

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Problems solved by technology

[0003] In the actual chemical inspection and analysis, the problems encountered are due to the high content of silicon and fluorine in the mold flux, using the traditional decomposition method, hydrochloric acid, nitric acid, hydrofluoric acid to dissolve the sample, perchloric acid to smoke, or to dissolve with hydrochloric acid , and then carry out the residue treatment, there will be volatilization loss of boron in the decomposition process, so the determination of diboron trioxide in mold flux has not been carried out, and at the same time, there are no reports on the determination method of diboron trioxide in mold flux at home and abroad

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