Determination of nitrogen in steel slag accelerant by inert gas fusion-thermal conductivity method
Nitrogen content is one of the important parameters to measure the performance of steel slag ac-celerant,so it is necessary to determine the content of nitrogen in steel slag accelerant.0.10 g of sample was weighed and transferred into tin foil.After packing the sample,the tin foil was pressed and sealed and then put into nickel basket.The nickel basket was transferred into graphite duplex crucible for determina-tion.The calibration curve was drawn with powdered reference materials of iron dust,nitride ferromanga-nese,high nitrogen ferrochrome and vanadium nitrogen alloy powder,which could cover the range of ni-trogen content in steel slag accelerant.Meanwhile,the nitrogen content was at a certain gradient.Conse-quently,a method for determination of nitrogen content in steel slag accelerant was established by inert gas fusion-thermal conductivity.Under the optimized experimental conditions,the nitrogen content in the sample showed a good linear relationship with its corresponding peak area.The correlation coefficient of calibration curve was 0.999 3.The limit of detection was 0.003％,and the limit of quantification was 0.010％.The contents of nitrogen in 4 steel slag accelerant samples was determined according to the pro-posed method in parallel for 7 times,and the relative standard deviations(RSD)of determination results ranged from 0.91％to 1.7％.2 steel slag accelerant samples(0.05 g)were used for recovery test by adding about 0.05 g of reference material of iron dust or nitride ferromanganese.The recoveries were be-tween 95％and 102％.
steel slag accelerantinert gas fusionthermal conductivity methodnitrogen
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