Kunming, China
Kunming, China

Time filter

Source Type

Xia H.-Y.,Kunming University of Science and Technology | Peng J.-H.,Kunming University of Science and Technology | Niu H.,Kunming University of Science and Technology | Niu H.,Yunnan Copper Co. | And 5 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2010

The non-isothermal leaching kinetics of primary titanium-rich material by microwave heating was investigated, and the temperature-pressure curves of leaching system and microwave absorption characteristics of mixture solutions before and after leaching were measured. The research of non-isothermal kinetics was evaluated by the leaching rate of Fe and the total apparent velocity equation of the non-isothermal kinetics of leaching for primary titanium-rich material by microwave heating was obtained. It is shown from the temperature-pressure curves that the high temperature and high pressure of closed leaching system are favorable to the enhancement of the leaching rate of Fe. Microwave absorption characteristics of mixture solutions before and after leaching show that there are abrupt changes of microwave absorption characteristics for 15 HCl solution and the mixture solution after leaching by 20 HCl. © 2010 The Nonferrous Metals Society of China.


Li P.L.,Kunming University of Science and Technology | Shi Y.F.,Yunnan copper co. | Liu D.W.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

With the development and exhaustion of resources, the reclamation of secondary resources, especially urban mine, must be on the agenda. The major part of urban mine is waste printed circuit board (WPCB), and the effective processing of WPCB is depend on the disassembly. This article analyze the form of fastening, the method of fusion welding, the recovery of welding and the disassembly of electronic component in process of disassembly, and point out the direction and tendency of development. © (2014) Trans Tech Publications, Switzerland.


Shi Y.-F.,Yunnan Copper Co. | Zheng W.-Y.,Yunnan Copper Co. | Fang Y.,Yunnan Copper Co. | Li J.,Yunnan Copper Co. | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2015

After 0.20 g of sample was transferred into high-aluminum crucible, the crucible was put into muffle furnace at 250℃ for 30 min to remove sulfur and arsenic. Then, 3.5 g of sodium peroxide was added, and they were fused at 730℃ for 7 min. The melt was leached with water, and the solution was heated to slight boiling for about 5 min to accelerate the complete decomposition of hydrogen peroxide generated from sodium peroxide. Then, the solution was diluted to the constant volume followed by filtration. One drop of paranitrophenol solution was added and hydrochloric acid (1+6) was dripped into solution until the yellow color just disappeared (pH≈1). The solution was diluted to 20 mL. Then, 5 mL of 400 g/L citric acid solution, 5 mL of hydrochloric acid (1+6), 5 mL of 10 g/L dimethylglyoxime ethanol solution and 5 mL of 250 g/L stannous chloride solution were added for coloring. Consequently, a method was established for determination of rhenium in rhenium-rich slag by dimethylglyoxime spectrophotometry. The experiments showed that Beer's law was obeyed for rhenium in mass fraction range of 100-600 μg/100 mL with absorbance. The detection limit of method was 11.3 μg/mL. The interference test indicated that the coexisting ions in sample had no interference with the determination. The proposed method was applied to the determination of rhenium in two rhenium-rich slag control samples and two actual samples. The results were basically consistent with the reference values. The relative standard deviations (RSD, n=22) were in range of 0.69%-1.1%, and the recoveries were between 99% and 100%. © 2015, Central Iron and Steel Research Institute. All right reserved.


Zheng W.-Y.,Yunnan Copper Co. | Li J.,Yunnan Copper Co. | Fang Y.,Yunnan Copper Co. | Wang C.-F.,Yunnan Copper Co. | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2015

EDTA and tartaric acid were added in sample solution to eliminate the interference of coexisting ions, a large number of fluorine ions and sulfuric acid. In alkaline medium at pH 12-13, trichloromethane was added to extract tetraphenylarsonium thioperrhenate complex formed by tetraphenylarsonium chloride hydrochloride and rhenium(VII). Then, hydrochloric acid (1+1) was used to re-extracted rhenium(VII). Stannous chloride was added for reducing rhenium(VII) to rhenium(II), and potassium thiocyanate was added to react with rhenium(II) to form potassium thiocyanate-rhenium(II) orange yellow complex. Ethyl acetate was added to extract this complex and the solution was diluted to constant volume. Thus, a method was established for determination of rhenium in smelting waste acid of copper concentrate by potassium thiocyanate spectrophotometry. The results showed that the Beer's law was obeyed for rhenium in range of 0-50 μg/10 mL in 6 mol/L hydrochloric acid at wavelength of 430 nm. The correlation coefficient (R2) was 1.0000. The detection limit of method was 1.59×10-6 μg/mL. The proposed method was applied to the determination of rhenium ranged from 4.0 to 16.0 mg/L in the synthetic samples of smelting waste acid of copper concentrate, and the results were consistent with the theoretical values. When the proposed method was applied to determine actual samples, the relative standard deviation (RSD, n=22) was 0.72%-2.2%, and the recoveries were between 99.8%-100%. ©, 2015, Central Iron and Steel Research Institute. All right reserved.


Li H.Q.,Suzhou Institute for Nonferrous Metals | Hu Z.W.,Yunnan Copper Co. | Deng D.W.,Yunnan Copper Co. | Xiang C.J.,Suzhou Institute for Nonferrous Metals | And 2 more authors.
Advanced Materials Research | Year: 2012

The authors investigated the mold electromagnetic stirring technology of horizontal continuous casting for CuCrZr alloys. Due to the oxidizability of the zirconium, the CuCrZr alloys are difficult to produce by continuous casting process. A short process for CuCrZr alloys material engineering is urgently needed. The mold electromagnetic field improved the surface of CuCrZr wire rod. The cast structure was also refined. With the help of mold electromagnetic stirring technology, CuCrZr wire rods were horizontal continuous cast. By using a set of suitable parameters, big weight wire rods with an excellent surface were cast. The CuCrZr wire rod possessed an average grain size of 1. 5mm, and the columnar crystal proportion was less than 10%. © (2012) Trans Tech Publications, Switzerland.


Jiang J.,Kunming University of Science and Technology | Dong W.,Kunming University of Science and Technology | Zhang S.,Kunming University of Science and Technology | Luo J.,Yunnan Copper Co. | And 2 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2016

The main factors influencing the overhang degrees of starting sheet of traditional copper electrolysis were analyzed, and a continuous wide line of suppression on both sides of a starting to improve its trailer overhang degrees was designed. By Deform-3D software establishing plastic finite element model of variable thickness (0.8 mm to 1.5 mm) starting sheet, the validity of the new design of wide line was described. The overhang degrees reaches +5 mm, meeting the enterprise requirement. The ex-perimental prototype was designed, and 26 groups of starting sheet were selected randomly to test. The results exhibit 70% of the overhang of starting sheet to +5 mm, which is well agreement with the simulated ones, meeting the requirement. © 2016, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.


Wu Y.C.,General Research Institute for Nonferrous Metals, China | Yan M.,Yunnan Copper Co.
Advanced Materials Research | Year: 2011

In this paper, the process of Cu-Ag contact wire with adding rare-earth elements was presented. The additive process of the rare-earth elements and the function of the rare earth were chiefly analyzed. Adding the rare-earth elements into melt alloy, the oxide and sulfur can be removed from the liquid, so we can get the purified alloy. At the same time, adding rare-earth can reduce the external crack flaws which produced during the casting and makes the grain refined, as the result, the properties of the Cu-Ag alloy contact wire can be greatly improved and meliorated. Such as the conductivity, the specific elongation, tensile strength and so on are improved. © (2011) Trans Tech Publications, Switzerland.


Zhu X.,Kunming University of Science and Technology | Qi X.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology | Shi Y.,Yunnan Copper Co | And 4 more authors.
TMS Annual Meeting | Year: 2014

The formation mechanism and property of high-arsenic sludge in the waste acid treatment by lime/iron salt technology were investigated. Most heavy metals were precipitated via the neutralization reaction and transferred to neutralization sludge. Arsenic was removed via the formation of calcium arsenate and calcium arsenite during the neutralization reaction. The following FeS04 addition and air oxidation could allow the As3+ → As 5+ and Fe2+-→-Fe3+ changes and the reaction between Fe and As species. A deep arsenic removal process was completed via the formation of insoluble ferric arsenate and arsenite in ferric-arsenic sludge. Comparing with ferric-arsenic sludge, the content of As and toxicity were higher for neutralization sludge. The main phase of sludge was CaSO 4.xH2O The content of As in sludge was varied from 1.71% to 15.9%, and the ratio of As3+/ As5+ was varied from 0.54 to 2.48. The leaching toxicities of As, Se and Hg exceeded the maximum levels allowed in GB 5085.3-2007. The lcaching toxicity of As was hundred times as much as the value in Chinese standard. The sludge produced from waste acid treatment in copper metallurgy plant belonged to a hazardous waste and the arsenic toxicity was very high. Copyright © 2014 by The Minerals,Metals & Materials Society.


Shi Y.,Yunnan Copper Co. | Ye Z.,Yunnan Copper Smelting and Processing Complex
TMS Annual Meeting | Year: 2013

This paper has outlined forms of Au & Ag losses in copper smelting process and methods for increasing Au & Ag recovery, analyzed factors influencing Au & Ag recovery in copper converting process, presented Au & Ag behavior in copper electrorefining process, and reviewed effect of current density/electrolyte circulation rate during electrolysis and surface finish of cathode on Au & Ag losses. Measures and research direction for decreasing Au & Ag losses in electrolysis have also been introduced. Based on Au & Ag behavior in copper electrorefining process and previous studies by others, new approach for increasing Au & Ag recovery in copper smelter has been discussed. And brief comparison has made between continued multiplication method and equilibrium method application in the case of calculation of Au & Ag recovery in copper smelter.


Zhang B.,Yunnan Copper Co. | Yan L.,Yunnan Copper Co.
European Metallurgical Conference, EMC 2013 | Year: 2013

Copper anode slime is the byproduct in the process of electro refining, which yield accounts up to 1 percent of the blister. There are several kinds of materials concentrated in copper anode slime, which range from raw and auxiliary materials to insoluble in electrolyte. The trends for processing copper anode slime are using advanced technology and high efficiency equipment, simple operation, rapidly process, shorten the holding time of precious metals, and enhance the recovery rate of metals and comprehensive utilization of resources. This paper will deal with the new procedure of processing copper anode slime pretreated by pressure acid leach. This procedure is in possession of independent knowledge property rights. The new process aims to result in green leaching copper anode slime, which has been validated by experiments. It can conclude in the high removing ratio of copper (>98.5 %) and the lowest leaching ratio of silver, and the impurities can be separated from noble metals successfully and easily.

Loading Yunnan copper co. collaborators
Loading Yunnan copper co. collaborators