Ping Long

Determination of Ten Impurity Elements in Tin Concentrate and Smelting Products by ICP-AES

In this research, ICP-AES was used for determining ten impurity elements (Fe, Pb, Ca, Mg, Cu, Zn, Al, As, Sb, and Bi) in tin concentrate and smelting products, such as crude tin and slag. Samples were dissolved by hydrochloric acid and nitric acid. Determination conditions were investigated in detail. Influences of matrix and coexisting elements were eliminated by selecting proper analysis spectral lines. Under the optimum conditions, the correlation coefficient of calibration curves were higher than 0.999. The detection limits of these ten impurities were in the range between 0.0009 to 0.0621 μg/ml. Relative standard deviation (RSD) values were lower than 6.0%, and the recoveries of standard addition were between 85 and 109%. The proposed method was demonstrated to be reliable by comparing with standard analysis methods and certified values of standard sample. It could be applied for determining impurity elements in tin concentrate and smelting products successfully.

Quantitative Analysis of The Trace Elements in Purity Indium Material by Glow Discharge Mass Spectrometer

In this study, the analysis method of trace element in pure indium using glow discharge mass spectrometry (GD-MS) has been established by correcting the analysis result, which was obtained from non-standard quantitative method of GD-MS. The effect of instrument operating parameters, the resolution and isotopes and the pre-sputtering time on the determination results were investigated respectively. The optimized operating parameters of the instrument were obtained as follows: the discharge current was 37.5mA and discharge airflow was 475ml/min. Mass spectral interferences have been eliminated using selected resolution and isotope. The pre-sputtering time was 30 min. 4 trace elements in two pure samples were determined for 6 times. The RSD were less than 20%. The content of trace elements in indium samples was determined by GD-MS and Chemical Analysis Method of Indium which is tested by inductively coupled plasma atomic emission spectrometry, respectively. The results were consistent with each other.

Removal of Sodium Ions from the Mother Liquor of Sodium Fluorosilicate by Ion Exchange Method

Ion exchange method was used to remove the sodium ions from the mother liquor of sodium fluorosilicate in this study. Some experiments were done at different conditions of the amount of 732 resin, reaction temperature and time. At the same time, the regeneration method of 732 resins and the effect of removing sodium ions of the regenerative resins were investigated either. The optimum conditions were obtained. The result indicated that ion exchange method was feasible. And the resins could be regenerated and reused for many times. Ion exchange method was pollution-free and low cost in the treatment process of mother liquor of sodium fluorosilicate.