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Wang X.,Kunming University of Science and Technology | Wang X.,Engineering Laboratory of Microwave Application and Equipment Technology | Srinivasakannan C.,The Petroleum Institute | Duan X.-H.,Hebei University of Technology | And 5 more authors.
Separation and Purification Technology | Year: 2013

The leaching kinetics of zinc residue, having total Zn content of 12.31%, along with other metallic components such as Fe and Pb, is leached using sulfuric acid as solvent, augmented with ultrasound is presented. The effects of variables such as the leaching temperature, sulfuric acid concentration, particle size, liquid/solid ratio and the ultrasound power have been assessed. The results show the maximum recovery of zinc to be 80% at an ultrasound power of 160 W, leaching temperature of 65 C, sulfuric acid concentration of 1.4 mol/L, particle size range of 74-89 μm and liquid/solid ratio of 4. The kinetics of leaching is modeled using shrinking core model and the rate controlling step is identified to be the diffusion through the product layer. The raw and the leached residue are characterized using XRD and SEM/EDX analysis. The activation energy is estimated to be 6.57 KJ/mol, while the order of reaction with respect to sulfuric acid concentration is 0.94 and particle size is 0.12 respectively. © 2013 Elsevier B.V. All rights reserved.

Yang Z.,Kunming University of Science and Technology | Hou K.,Kunming University of Science and Technology | Cheng Y.,Yunnan Ya rong Mining Technology Co. | Chen F.,Kunmning Engineering & Research Institute of Nonferrous Metallurgy Co. | Kang Y.,Kunming Metallurgy Research Institute
Modern Tunnelling Technology | Year: 2014

At present it is a blank for a theoretical calculation formula for diffusion radius of Bingham fluid based on column penetration grouting both at home and abroad. In this paper, a theory formula in this regard was deduced according to rheological equation and seepage motion equation of Bingham fluid. The influences of Bingham fluid rheological behavior, grouting pressure, groundwater pressure and water temperature of prepared grout on diffusion radius based on column penetration grouting are theoretically analyzed and then verified by grouting test. Results show that though there is 30% differences between calculated theoretical values and measured values in grouting tests, they are still within the range of acceptable errors. Therefore, the research findings provide theoretical support and play a guiding role in the process of grouting. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved.

Feng Q.C.,Kunming University of Science and Technology | Wen S.M.,Kunming University of Science and Technology | Cao Q.B.,Kunming University of Science and Technology | Bai X.,Kunming University of Science and Technology | Zhao W.J.,Kunming Metallurgy Research Institute
Advanced Materials Research | Year: 2014

The dissolution equilibrium of cerussite within the entire pH range was theoretically calculated, which was based on coordination chemistry, thermodynamics and the mass balance principle of Pb2+ and CO32- in pulp solution. The calculation result showed that the total lead concentration (CPbT) of cerussite decreased significantly with increasing pH below 6 or so; however, at pH of about 10, a reverse trend of CPbT may be observed. Within the pH range from 6 to 10, the CPbT of cerussite remained close and presents a minimum value of around 10-4 mol/L. This paper may provide a theoretical basis for the dissolution process of cerussite and its conditioning stage before benefication by adopting flotation method. © (2014) Trans Tech Publications, Switzerland.

PubMed | CAS Institute of Process Engineering, University of Science and Technology of China, KunMing Metallurgy Research Institute, Yunnan XinLi Nonferrous Metals Co. and Kunming University of Science and Technology
Type: | Journal: Journal of hazardous materials | Year: 2016

Raw ilmenite concentrate containing Cr can be either as a resource or as one kind of the most hazardous solid waste. In order to recover titanium and chromium from the raw concentrate which was separated from the Promenade deposit, Gaza province, Mozambique, an innovative technology using modification of magnetic property followed by magnetic separation was proposed. Magnetic property, phase and surface morphology of the sample before and after oxidizing roasting were firstly characterized by magnetism, chemistry, XRD and MLA analyses to interpret the mechanism of oxidizing roasting of the ilmenite. Then, these factors such as oxidizing roasting temperature, residence time and magnetic induction affecting on magnetic separation performance were examined and the optimum process parameters were determined. A commercial concentrate containing 47.94% TiO

Liu S.-L.,Panzhihua University | Liu S.-L.,Kunming Metallurgy Research Institute | Xiang J.-Y.,Xihua University
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2015

The effects of thermal pretreatment on the leaching of Yunnan ilmenite ores were investigated from two aspects: the dissolution of iron and titanium, and the proportion of fine precipitations. The results indicate that high-temperature reduction or oxidization produces phase and structure transformations on ilmenite that facilitate the dissolution of iron, reduce the dissolution of titanium, and facilitate the hydrolysis of dissolved titanium. The results further indicate that oxidation at temperatures ranging from 1023 K (750 °C) to 1273 K (1000 °C) can significantly decrease the proportion of fine products. It is believed that the structure of oxidized ilmenite played an important role in minimizing the proportion of fine materials. © 2015 The Minerals, Metals & Materials Society and ASM International

Liang Y.-S.,Kunming Metallurgy Research Institute | Wang J.-R.,Kunming Metallurgy Research Institute
Yejin Fenxi/Metallurgical Analysis | Year: 2012

After the sample was dissolved with aqua regia-hydrofluoric acid and selenium in the sample solution was thus volatilized and removed by sulfuric acid fuming at high temperature, a determination method of copper in hydrometallurgical mud, slag and other selenium-rich materials by iodometry was established. The experiment showed that, selenium could also react with iodine reagent to interfere with the determination of copper in glacial acetic acid medium. After treatment with aqua regia-hydrofluoric acid, the residual amount of selenium in the sample was higher than the maximum allowable amount of selenium for the determination of copper. However, after further treatment with sulfuric acid fuming, there was almost no residual selenium, so the interference of selenium with the determination of copper could be eliminated. The optimal dosage of sulfuric acid for volatilizing selenium was 3 mL. The removal mechanism of selenium was also discussed. The content of copper (2%-35%) in copper anode slime 1#, copper anode slime 2#, acid mud, iron replaced slag and selenium-rich material samples was determined by the proposed method. The results were consistent with those obtained by national standard method of GB/T3884.1-2000, and the relative standard deviations (RSDs, n=6) was less than 4%.

Zhao D.-P.,Kunming Metallurgy Research Institute | Wang J.-R.,Kunming Metallurgy Research Institute
Yejin Fenxi/Metallurgical Analysis | Year: 2013

The simultaneous determination conditions of aluminum, potassium, iron and vanadium in titanium additive by inductively coupled plasma atomic emission spectrometry (ICP-AES) were studied, and accordingly, a determination method was established. The sample was dissolved in sulfuric acid, hydrochloric acid and nitric acid. The analytical lines for aluminum, potassium, iron and vanadium were 396.1, 766.4, 259.9 and 292.4 nm, respectively. Under the optimal conditions, the matrix titanium, sulfuric acid and coexisting elements had no interference in the determination. The detection limit of aluminum, potassium, iron and vanadium was 0.0030 μg/mL, 0.0017 μg/mL, 0.0024 μg/niL and 0.0014 μg/mL, respectively. The proposed method was applied to the analysis of actual samples, and the found results were consistent with those obtained by titration method or atomic absorption spectrometry. The relative standard deviation (RSD) was less than or equal to 1.5%. This method could meet the analytical requirements of impurities in aluminum industry additives (titanium agent).

Jian S.,Kunming Metallurgy Research Institute | Hu Y.,Central South University
Advanced Materials Research | Year: 2012

This study presents sulfide ores with lead 0.71%, Zinc5.07% from Laos, using a grinding (grinding fineness -0.075mm, 80%). Then, the lead ores is recovered by flotation first. Second, the middling ores is returned in preferential floatation. The mixed collector is used in all flotation such as ethyl xanthogenate, butyl xanthate and SN-9.After flotation, the grade of lead concentrate is 63.63%, and a recovery is 83.26%.In addition, the grade of zinc is 56.33%,a recovery is 86.63%. It can result in obvious increase in yields of mineral processing and economic better effect in production, compared to the old technology. © (2012) Trans Tech Publications, Switzerland.

Miao Y.,Key Laboratory of Medicinal Chemistry for Natural Resource | Miao Y.,Qujing Normal University | Zhai Z.,Key Laboratory of Medicinal Chemistry for Natural Resource | Zhai Z.,Kunming Metallurgy Research Institute | And 4 more authors.
Materials Science and Engineering C | Year: 2010

Anatase mesoporous titania with novel morphologies were synthesized by using the skins of tomatoes, bulb onions, grapes, and garlic bulbs, respectively, as templates and used for the photodegradation of Gentian violet, methyl violet, xylenol orange, and Rhodamine B under UV light. The samples were characterized by a combination of various physicochemical techniques, such as X-ray diffraction, SEM, HRTEM, N2 adsorption/desorption, diffuse reflectance UV-Vis, and FT-IR. It was found that all of the synthesized mesoporous titania samples exhibited similar morphologies to those of the original templates. The photoactivity of P25 TiO2 for the four dyes is nearly the same while the mesoporous titania samples synthesized by using the four skins as templates exhibited varied photoactivities for the four dyes. © 2010 Elsevier B.V. All rights reserved.

Cao P.,Central South University | Zheng X.,Central South University | Li N.,Central South University | Zhang X.,Central South University | Zhang X.,Kunming Metallurgy Research Institute
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

Relaxation experiment on deep amphibolite samples from Jinchuan II mining area as conducted using multi-step incremental loading method. Further analysis of relaxation experimental results was made in contrast to those of creep experiment conducted by multi-step incremental cyclic loading and unloading. Creep experiment mainly reflected the long-term strength of rocks; while relaxation test proved that the rocks had residual strength after rupture. Continuous relaxation law and non-continuous ladder-type relaxation law were found through relaxation curves. The result showed that the non-continuous ladder-type relaxation law was closely related to micro-cracks initiation and original cracks propagation. The elastic and viscoelasto plastic model(K-B model) was adopted to research the visco-elasticplasticity of deep amphibolite based on the test data. The analysis of fitting curves and fitting parameters illustrated that the curves of K-B model were well agreed with those of both creep and relaxation rock samples. It was concluded that the K-B model can properly describe the rheological characteristics of amphibolite in Jinchuan II mining area.

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