Quantitative Analysis Method of Fluorine and Chlorine Content in Steel Slag Accelerant Based on Orthogonal Test
The content of fluorine and chloride in steel slag accelerant is high and there is currently no standard method for their determination.This paper establishes a quantitative analysis method for determining the content offluorine and chlorine in steel slag accelerantusing high temperature hydrolysis combustion and ion chromatography.An orthogonal test was used to optimize the oxygen flow rate,hydrolysis temperature and hydrolysis time,thus avoiding the repeated measurements required by the traditional single factor conditional test method.The results showed that there was a good linear relationship between the content of fluorine and the peak area,and the correlation coefficient was greater than 0.9999.The detection limits of fluorine and chlorine were 0.0024%and 0.0026%,respectively.Using this method,the relative standard deviations(RSD,n=6)for determining the fluorine and chlorine content were 1.94%-2.23%and 2.20%-2.86%,respectively.Additionally,spiked recovery tests were performed on two steel slag accelerant samples,with recovery rates for fluorine and chlorine ranging from 92.7%to 96.5%and 95.5%to 97.0%,respectively.The results indicate that the established in this paper can be directly used for detecting high levels of fluorine and chloride in steel slag accelerant,providing technical support for the regulation of such commodities.
steel slag accelerantfluorinechloridehigh-temperature hydrolysis combustionion chromatographyorthogonal test
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