Bayuquan Entry Exit Inspection and Quarantine Bureau

Yingkou, China

Bayuquan Entry Exit Inspection and Quarantine Bureau

Yingkou, China
SEARCH FILTERS
Time filter
Source Type

Chu N.,Bayuquan Entry Exit Inspection and Quarantine Bureau | Li W.-G.,Bayuquan Entry Exit Inspection and Quarantine Bureau | Jiang X.-G.,Bayuquan Entry Exit Inspection and Quarantine Bureau | Zhang Q.,Bayuquan Entry Exit Inspection and Quarantine Bureau | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2014

As carbonate mineral, limestone has great loss on ignition. A series of chemical analysis methods have been developed for the determination of limestone, but the operation process was complex, and the consumption of chemical reagents was large and the analytical time was long for those methods. A method has been developed for the determination of calcium oxide, magnesium oxide, silica oxide, iron oxide and aluminum oxide in limestone by wavelength dispersive X-ray fluorescence spectrometry. Sample and fusion agent were fused under the temperature of 1 050 ℃ for test portion slice preparation, which the ignited sample was used as test portion, lithium tetraborate was used as fusion agent, and the dilution proportion of test portion and fusion agent was 1∶10, 50 g/L of ammonium iodide was used as releasing agent. The reference standard materials of limestone were used as standard test portion for standard curves preparation, and the correlation coefficients of all components were in the range of 0.993 1-0.999 7. Precision of the proposed method (RSD, n=11) was in the range of 0.13%-2.1%, and the results of determination were in good agreement with certified values and the deviation was in the range of 0-0.39%. The proposed method mostly weakened the influence of the determination results, which moisture and carbon dioxide in air were absorbed by the ignited test portion.


Li B.,Northwest Institute for Nonferrous Metal Research | Sun B.,Northwest Institute for Nonferrous Metal Research | Zhou K.,Northwest Institute for Nonferrous Metal Research | Chu N.,Bayuquan Entry Exit Inspection and Quarantine Bureau | And 3 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2012

Nickel content in laterite nickel ores was determined by acid digestion-dimethylglyoxime photometric method. Samples were dissolved with mixed acid of HCl-HNO3-HF, and then made through perchloric acid smoke. In sodium hydroxide medium, with ammonium persulfate as oxidant, a soluble wine-red complex was formed through the reaction of nickel and dimethylglyoxime. Nickel content was determined at 460 nm wavelength. The proposed method was applied to determine the nickel content in 9 samples of different laterite nickel ores. The relative deviation (RSD) was between 1.10%-3.78%, and the recovery was in the range of 98.5%-101.5%. Compared with that of other three laboratories and three different methods including sodium peroxide fusion-dimethylglyoxime spectrophotometry, AAS and ICP-AES, the results were consistent. Copyright © 2012, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


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

The copper magnetite belonged to the rich-copper, high-sulfur and high-phosphorus magnetic ore. Using the mass of burned sample after measurement of loss on ignition as sample mass, an analysis method of copper, iron, silicon, aluminum, calcium, magnesium, titanium, manganese and phosphorus in copper magnetite was established by wavelength dispersion X-ray fluorescence spectrometry with fusion sample preparation. The lithium tetraborate-lithium metaborate mixture (m:m=12:22) was used as flux. The dilution ratio between sample and flux was controlled at 1:10. The lithium nitrate solution (220 mg/mL) and ammonium chloride solution (50 mg/L) was used as oxidizer and release agent, respectively. The sample was fused at 1050℃ for 20 min. The prepared specimens were transparent with high vitrification degree. The certified reference material of magnetite was used as matrix to prepare reference material of copper magnetite by adding the standard solution of sulfur and phosphorus which solved the problem of copper magnetite without certified reference material. The correlation coefficients of calibration curves of testing components were between 0.9890 and 0.9999. The detection limit of method was 0.0017%-0.30%. The relative standard deviations (RSD, n=11) were between 0.15% and 4.7%. The certified reference material of copper-bearing iron ore with similar composition to copper magnetite matrix was determined by the proposed method, and the results were consistent with the certified values. The copper magnetite samples with different content level were determined by the proposed method, and the results were basically consistent with those obtained by titrimetry, gravimetry, inductively coupled plasma atomic emission spectrometry (ICP-AES), atomic absorption spectrometry (AAS) and spectrophotometry. The synergism tests of eight copper magnetite samples with different content level in eight laboratories were conducted. The results indicated that the repeatability and reproducibility of the proposed method was good. © 2015, Central Iron and Steel Research Institute. All right reserved.


Chu G.,Liaoning University | Jiang X.-G.,Bayuquan Entry Exit Inspection and Quarantine Bureau | Lin Z.,Bayuquan Entry Exit Inspection and Quarantine Bureau | Li W.-G.,Bayuquan Entry Exit Inspection and Quarantine Bureau | Shao S.,Liaoning University
Yejin Fenxi/Metallurgical Analysis | Year: 2010

The sediment in aluminum reduction cells formed in the aluminum electrolytic process seriously reduce the use life of the cells. The phase composition of sediment in oven base of aluminum reduction cells was analyzed by X-ray diffraction method (XRD). The results showed that the black and white part of the surface of scrapped carbon brick from the bottom of aluminum reduction cells existed mainly in the form of AlN, NaF, Al12 ((OH)0.5F0.96)6, and Al(OH)3, as well as a little graphitized carbon, CaF2 and Na1.95(Al1.95Si0.05O4). The content of A1N in the shallow interior layer of scrapped carbon brick decreased apparently while the content of NaF were relatively high, which indicates that much of NaF generated during the electrolytic process has penetrated into the interior of scrapped carbon brick. The original semi-graphitized carbon in the surface and shallow layer of scrapped carbon brick was fully graphitized.

Loading Bayuquan Entry Exit Inspection and Quarantine Bureau collaborators
Loading Bayuquan Entry Exit Inspection and Quarantine Bureau collaborators