Time filter

Source Type

Shanghang, China

The Wuziqilong copper deposit is a transitional-type between porphyry- and epithermal-type deposit located inside of the Zijinshan Au-Cu-Mo polymetallic ore field. Alteration and mineralization in the deposit are pervasive and intensive, which show typical zonation both horizontally and vertically. Based on the sulfide assemblages, the deposit can be divided into the South, Middle, and North mineralization zones. Ore bodies mainly occur between the elevation of 300~480 m in the Middle mineralization zone, and was controlled by the Northeast- and Northwest-trending faults and fractures. Near infrared spectroscopy technique was utilized for identifying alteration minerals in drill cores and determining the alteration zones in the mining area. Combining with the drill core logging and geological mapping, alunite-dickite-silicic alteration zone, dickite-sericite-silicic alteration zone, and sericite-silicic alteration zone were recognized. The type of mineralization is closely related to different alteration types, i.e., the typical pyrite- covellite-digenite assemblage is constrained in the alunite-dickite-silicic zone, while the pyrite-chalcopyrite-bornite assemblage is pervasively observed in the dickite-sericite-silicic alteration zone. The overprinting zones of the forementioned two alteration types host high-grade ores, which was used for exploration of "bonanza" ores. These two alteration zones and their close relationship with mineralization were used as indicators for exploration and deep prospecting in the area.

Yu J.-S.,Zijin Mining Group Co.
Yejin Fenxi/Metallurgical Analysis | Year: 2015

The sample was burned in high-temperature furnace at 550℃ for 1-2 h for ashing. The residue was dissolved with hydrochloric acid and nitric acid. With 5.0% hydrochloric acid solution (V/V) as determination medium, a method for determination of copper and iron in gold-loaded carbon was established by flame atomic absorption spectrometry (FAAS) with 324.8 nm and 248.3 nm as determination wavelength, respectively. The results showed that other elements in gold-loaded carbon had no interference with the determination of test elements. There was also no mutual interference between test elements. Under the optimized instrumental conditions, the detection limit of copper and iron was 0.014 μg/mL and 0.010 μg/mL, respectively. The proposed method was applied to the determination of gold-loaded carbon samples. The relative standard deviations (RSD, n=11) were in range of 0.39%-2.8%, and the recoveries were between 96% and 102%. The contents of copper and iron in four certified reference materials of gold-loaded carbon, i. e., GSB 04-3093-2013-GSB 04-3096-2013, were determined according to the experimental method, and the results were basically consistent with the certified values. © 2015, Central Iron and Steel Research Institute. All right reserved.

Xia Z.-Z.,Zijin Mining Group Co.
Yejin Fenxi/Metallurgical Analysis | Year: 2012

A basic melting and precipitation separation-EDTA titration method for the determination of aluminum oxide in copper concentrates was established. The samples were melted by sodium hydroxide and sodium peroxide, and most of the interfering elements were separated through precipitation. At certain pH, the elements including aluminum, zinc and tin ions reacted with excessive EDTA, and then pyrogallic acid was added to eliminate the interference of tin. By replacing Al-EDTA with fluoride salt, the obtained free EDTA were titrated with standard solution Zn(Ac) 2. The content of aluminum oxide was thus calculated according to the consumption of standard solution Zn(Ac) 2. The influencing factors were investigated, including selection and dosage of fluxes, melting time, water amount for leaching, dosage of buffer solution, precipitates absorption effect and impurities interferences. The optimal determination conditions were finally obtained. The method was applied to the analysis of sample, and it was found that the relative standard deviation (RSD) was in the range of 0.37%-0.85% and the standard addition recovery was between 98.8%-99.0%.

Hua J.M.,Fuzhou University | Hua J.M.,Zijin Mining Group Co. | Wei K.M.,Fuzhou University | Zheng Q.,Fuzhou University
Hydrometallurgy | Year: 2012

The thermal desorption technique has been explored experimentally to remove mercury from the gold-loaded granule activated carbon (GAC) co-adsorbed during heap leaching of gold ores bearing mercury. The effects of treatment temperature, retention time and flow rate of steam used as purge gas on residual mercury levels were investigated. Characterization techniques such as N 2 adsorption-desorption, X-ray powder diffraction and X-ray photoelectron spectroscopy, were employed to understand how thermal treatment affects the gold elution in a caustic cyanide-free eluant from the treated GAC. The results showed that mercury desorption was strongly affected by the treatment temperature and steam flow rate. Treatment for 3 h at 550°C under steam atmosphere with 0.4 m 3/h flow rate was allowed to remove more than 99.78% mercury and the content of residual mercury in the treated GAC was decreased to 0.035 g/kg, likely reaching the thresh level of mercury extraction during gold elution in a caustic cyanide eluant. Meanwhile, activated carbon was partially regenerated, with only 4.06% weight loss of carbon, mainly due to microporosity recovery. However, it was observed that the thermal process would have heavily influenced elution of gold from the treated activated carbon in a caustic eluant without sodium cyanide. This phenomenon has been attributed primarily to the change of chemical state of gold species and accumulation of highly dispersed gold species and even formation of more stable gold nano-particles caused by a combination of promotion of high temperature and steam oxidation. The elution of gold from the treated sample could be improved through introduction of NaCN into the caustic eluant. However only 83.84% of gold was eluted, probably because the elution time was insufficient. © 2012 Elsevier B.V.

Chen J.,Guangxi University | Li Y.,Guangxi University | Long Q.,Zijin Mining Group Co. | Wei Z.,Guangxi University | Chen Y.,Guangxi University
International Journal of Mineral Processing | Year: 2011

Five tannin extracts from different trees were used to improve jamesonite flotation in the Changpo plant in Nandan, China. The flotation results demonstrated that the larch tannin extract was the best for improving jamesonite flotation. Compared to flotation without larch tannin extract, industrial trial results indicated that the Sb and Pb grade in the final concentrate increased from 13.1% and 14.8% to 17.6% and 19.9%, respectively, as the Zn grade decreased from 9.1 to 6.5%. In addition, the Sb and Pb recovery of 84.5% was achieved with the larch tannin extract (84.2% without larch tannin extract). Larch tannin extract depressed not only marmatite, but also to some extent pyrrhotite, arsenopyrite, pyrite, calcite and quartz. © 2011 Elsevier B.V. All rights reserved.

Discover hidden collaborations