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Xie H.,Kunming University of Science and Technology | Xie H.,Guizhou University | Wang J.,Yunnan Metallurgy Group Parent Company | Lu H.,Guiyang Aluminium and Magnesium Design Institute Co. | Bao C.,Kunming Metallurgical Research Institute
Hydrometallurgy | Year: 2013

Pressure leaching of manganese smelter dust with air as pressurized gas in a sulfuric acid medium was investigated. Optimum operating parameters were established as follows: liquid-to-solid ratio (mL/g), 5:1; initial sulfuric acid concentration, 120 g/L; leaching temperature, 120 C; air pressure, 0.8 MPa; ore ratio (manganese smelter dust amount/pyrite amount), 1:0.5; leaching time, 2 h; and agitation speed, 500 r/min. Extraction rates of manganese and iron were obtained at 96.1% and 7%, respectively, under these conditions; and residual percentage of final acid was about 34.9%. Manganese can be effectively separated from impurities, such as iron, through leaching process. Leaching efficiency of manganese increased from 72.9% to 96.1%, whereas that of iron and the residual percentage of final acid both decreased with increase in leaching time from 40 min to 120 min. Pyrite was coated by elemental sulfur when temperature was higher than 119 C, resulting in its inability to act as a reductant and to react with manganese dioxide. Therefore, leaching temperature must be lower than 120 C. Pressure leaching technique for manganese smelter dust was proven to be effective and reliable. © 2013 Elsevier B.V. Source


Xie H.-Y.,Kunming University of Science and Technology | Wang J.-K.,Yunnan Metallurgy Group Parent Company | Li T.-J.,Yunnan Jianshui Manganese Mine Ltd Liability Company | Ma J.,Yunnan Jianshui Manganese Mine Ltd Liability Company | And 3 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2011

The pressure leaching of manganese smelter dust with air as pressurized gas in a sulfuric acid medium was studied. Optimum operating parameters were established as follows: ratio of liquid to solid 5 mL/g, initial sulfuric acid concentration 120 g/L, leaching temperature 120°C, partial air pressure 0.8 MPa, mass ratio of manganese smelter dust to pyrite 1:0.5, leaching time 2 h, and agitation speed of 500 r/min. Under these conditions, the leaching rates of Mn and Fe are 96.1% and 7%, and the residual rate of final acid is about 34.9%. Manganese can be effectively separated from impurities such as iron in the leaching process. The pressure leaching technique of manganese smelter dust is further proved to be effective and stable. Source


Luo W.-B.,Kunming University of Science and Technology | Wang J.-K.,Kunming University of Science and Technology | Wang J.-K.,Yunnan Metallurgy Group Parent Company | Zhao X.-F.,Yunnan Yongchang Silicon Industry Co. | And 2 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2015

Pressure leaching of indium-bearing zinc oxide dust in sulfuric acid medium was studied by orthogonal experiments and single-factor experiments. The results showed that the important degree of various factors affecting the leaching rates of In followed the order of initial acidity > ratio of liquid to solid > pressure > temperature > time, and that affecting the leaching rate of zinc was the initial acidity > ratio of liquid to solid > temperature > time > pressure. The optimum conditions were obtained as the leaching temperature of 140℃, pressure 0.6 MPa, reaction time 90 min, ratio of liquid to solid 8 mL/g, initial acidity of 160 g/L, and stirring speed 500 r/min. Under the optimum conditions, the leaching rates of zinc and indium were over 99% and 91%, respectively, zinc and indium could be efficiently leached out with low content residual acid and good process stability. © 2015, Science Press. All right reserved. Source


Xie H.-Y.,Kunming University of Science and Technology | Xie H.-Y.,Guizhou University | Wang J.-K.,Kunming University of Science and Technology | Wang J.-K.,Yunnan Metallurgy Group Parent Company | And 3 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2013

The pressure leaching process of low grade manganese ore in a sulfuric acid medium was studied by orthogonal experiments and single-factor experiments. First, the better prescription of primary factors which affect the manganese leaching rate were determined through orthogonal experiments, namely initial acidity of 160 g/L, pyrite amount of 50 g, liquid-to-solid ratio of 5:1(5 mL/g), air pressure of 1 MPa, leaching temperature of 180°C, leaching time of 80 min. In order to analyze the leaching behavior of Mn, Fe and Al in the low grade manganese ore and realize highly effective separation of these three metallic elements, the technological parameters were adjusted refering to orthogonal experimental results. The effects of initial acidity, reaction temperature, pyrite amount, liquid-to-solid ratio, leaching time and leaching pressure on leaching rates of Mn, Fe and Al were examined through single-factor experiments. And the optimum leaching conditions were determined to be low grade manganese powdered ore of 100 g, initial acidity of 120 g/L, leaching temperature of 120°C, pyrite amount of 50 g, liquid-to-solid ratio of 5:1(5 mL/g), leaching time of 100 min, leaching pressure of 0.7 MPa, the agitation speed of 500 r/min. The experiments results indicate that this technology has good stability. Under the optimized leaching condition, the leaching rate of manganese is 96%, and the leaching rates of Al and Fe are 38.7% and 7.12%, respectively. The selectivity and highly effective dissolution of Mn are realized, the separation effect of Mn with impurities of Fe, Al, and so on, is good. These would lay a good foundation for realizing clean and highly effective recycling of each kind of valuable elements in the low grade manganese ore. Source

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