CHENG Yong,YUAN Jing-hong,HU Jin-rong

(Panzhihua Iron and Steel Group Research Institute Ltd Co., Chengdu  611731,China)

 Abstract: Titanium slag samples were digested in the manner of high-pressure sealed microwave heating in HF, HNO3, and then the common or micro iron, lead, arsenic, chromium, copper, phosphorus, manganese , vanadium, magnesium and calcium impurities in the slag were determined directly by the inductive coupling plasma atomic emission spectrographic method (ICP-OES) simultaneous. Test conditions for the sample digestion, interfering effects of the titanium matrix and coexisted elements, and the plasma determination parameters conditions, etc were investigated. By optimizing  the spectral lines for the elemental analysis, and by the use of the substrate matching and the synchronized background correction spectral interference and matrix effect were eliminated. The results of determination of a variety of 50,60,70,80,90 different levels of impurity elements in the slag showed that: in the detection range of 0.005% to 10.000% of calcium, magnesium, iron, and 0.005% to 2.000% of lead, arsenic, chromium, copper, phosphorus, manganese, vanadium, the calibration curve correlation coefficients were greater than 0.999 2, the background equivalent concentrations were 0.0020% ~ 0.0015%, the detection limits, 0.0009%~0.0038%, RSD≤0.677% when the contents≥1.0%, RSD≤3.85% when the concentration range were 0.010% ~ 0.100%  and the recovery rates were 90.0%～108.0%, using this method the results of three standard samples of high titanium slag of 70,80,90 were consistent with the traditional chemical method.

Key words: ICP-OES; titanium slag; impurities; microwave dispels

E-mail: luck2005_1@sina.com

Analysis and Testing Technology and Instruments, Vol. 18, No. 1, 2012,38-43