Bayuquan Entry Exit Inspection and Quarantine

Yingkou, China

Bayuquan Entry Exit Inspection and Quarantine

Yingkou, China
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Li C.-L.,Bayuquan Entry Exit Inspection and Quarantine | Jiang X.-G.,Bayuquan Entry Exit Inspection and Quarantine | Tang S.-F.,Beijing General Research Institute of Mining And Metallurgy | Liu C.-F.,Beijing General Research Institute of Mining And Metallurgy | And 3 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2012

The laterite nickel ore sample was decomposed with hydrochloric acid, nitric acid, hydrofluoric acid and perchloric acid. Then, in diluted nitric acid medium, the content of copper was determined on flame atomic absorption spectrometry at 324.8 nm. The background was deducted with deuterium lamp. Under optimized experimental conditions, the absorbance is linear with copper concentration in the range of 0.50-2.50 mg/L. The limit of determination was 0.057 mg/L. The recoveries obtained by standard addition method range from 91% to 103%.Copper content range from 0.01% to 0.50%, the equation of repeatability and reproducibility are r=0.1148 m+0.0032 and R=0.1300 m+0.0074. This method was applicable for the determination of laterite nickel ore with copper content of 0.01%-0.50%.


Zhang Y.-F.,Bayuquan Entry Exit Inspection and Quarantine | Jiang X.-G.,Bayuquan Entry Exit Inspection and Quarantine | Han F.,Bayuquan Entry Exit Inspection and Quarantine
Yejin Fenxi/Metallurgical Analysis | Year: 2015

The calibration curve was drawn with potassium sulphate primary reagent as surfur reference material. Consequently, a method for determination of high content sulfur in high sulfur copper magnetite was established by high frequency combustion infrared absorption spectrometry. The experiment was conducted with five different sulfur level samples of surfur mass fraction in range of 0.5%-7%(the mass fraction of sulfur was 7%, 5%, 2.5%, 1.5% and 0.5%, respectively). The optimum experimental conditions were as follows: sample weight was 0.15 g when sulfur mass fraction ranged from 0.5%-3%; sample weight was 0.10 g when sulfur mass fraction ranged from 3%-7%; the adding sequence of sample and flux in crucible was 0.8 g iron chips, sample then 2.0 g tungsten grain. The results showed that there was a good linear relation between sulfur content in range of 0.50-12 mg and its absorbance. The linear regressive equation was y=5 825.5x+415.75, and correlation coefficient was R=0.999 9. Detection limit of this method was 0.036%, and the lower limit of quantitation was 0.14%. The five high sulfur copper magnetite samples with different sulfur level mentioned above were determined parallelly for eleven times by the proposed method. The results were consistent with barium sulfate gravimetry with relative standard deviation (RSD) no more than 5.0%. The repeatability limit was r=0.032 m+0.036, and the reproducibility limit was R=0.040 m+0.053. ©, 2015, Central Iron and Steel Research Institute. All right reserved.

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