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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. Source

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. Source

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. Source

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 Source

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. Source

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