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Luo X.-P.,Jiangxi University of Science and Technology | Luo X.-P.,Jiangxi Key Laboratory of Mining and Metallurgy Environmental Pollution Control | Luo X.-P.,Key Laboratory of Southern Ionic Type Rare Earth Resources Development and Application | Luo X.-P.,University of Alberta | And 5 more authors.
Rare Metals | Year: 2015

Aluminum, the main impurity in the lixivium of weathered crust elution deposited rare earth ore, not only results in an increasing consumption of precipitant in the rare earth precipitation process, but also lowers the purity of final rare earth product. Aluminum in the weathered crust elution-deposited rare earth ore lixivium should be removed. Neutralizing hydrolysis method was employed to remove aluminum from the lixivium. Hexamethylenetetramine was found to be the optimum pH regulator for the removal of aluminum in the low concentration. When used to adjust the pH value of the lixivium to 5.0, aluminum in the lixivium can be effectively removed in the form of aluminum hydroxide precipitation with removal rate of 97.60 %. It shows that hexamethylenetetramine has a good effect on the removing of aluminum ions from the low-concentration lixivium. Moreover, hexamethylenetetramine in removing aluminum from lixivium has little adverse effect on the RE precipitation process. © 2015 The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg Source


Huang W.-F.,University of Science and Technology of China | Huang W.-F.,Jiangxi Key Laboratory of Mining and Metallurgy Environmental Pollution Control | Wang X.-F.,University of Science and Technology of China | Li X.-D.,University of Science and Technology of China | Yan S.-M.,University of Science and Technology of China
Applied Mechanics and Materials | Year: 2014

This study used ceramic membrane technology to concentrate tungsten fine particles for its inefficient recycling issue. Factors affecting the membrane concentration test were discussed, and the results show that: under the feed flow of 7000 mL/min, concentration time of 3 hours, and concentration liquid flow of 500 mL/min, it is the optimal effect of ceramic membrane concentration tungsten fine particle, which the interception rate reaches more than 99%, the membrane permeation flux can be nearly reach 470mL/(min × 1099cm2) above, and concentrate concentration can be basically stable at around 29%. Ceramic membrane flux recovery rate can be as high as 93% by 7 minutes backwashing firstly and then 2 minutes forward cleaning. © (2014) Trans Tech Publications, Switzerland. Source


Zhong C.,Jiangxi University of Science and Technology | Zhong C.,Jiangxi Key Laboratory of Mining and Metallurgy Environmental Pollution Control | Wang R.,Jiangxi University of Science and Technology | Wu K.,Jiangxi University of Science and Technology | Yu X.,Jiangxi University of Science and Technology
Chinese Journal of Environmental Engineering | Year: 2014

The experimental study of tungsten smelting wastewater containing arsenic and ammonia nitrogen was conducted by the combined process of ferric salt flocculation +MBR. The removal rates of As, COD, NH4 +-N and TN in the tungsten smelting wastewater were investigated by the combined process. The experimental results showed that the average removal efficiencies of As, COD, NH4 +-N and TN by the combined process were 97.2%, 93.4%, 74.0% and 52.8%, respectively. The resistance of the system to flux impact and organic shock loads is strong. Source


Chen Z.-Y.,Jiangxi University of Science and Technology | Chen Z.-Y.,Jiangxi Key Laboratory of Mining and Metallurgy Environmental Pollution Control | Chen L.,Jiangxi University of Science and Technology | Chen L.,Jiangxi Key Laboratory of Mining and Metallurgy Environmental Pollution Control | And 2 more authors.
Nature Environment and Pollution Technology | Year: 2016

The influence performances in two phase mixture of air-droplet discharge are analysed in the paper based on the gaseous discharge unit process, and the mechanism in two phase mixture of air-droplet discharge is researched. The research obtains the result not only that the gas spray electrically charged effect is to cause the spatial free electron number to reduce greatly, while is to increase an amount of ions, and discharge phenomena is weakened, but the second voltage increased, intensity of electric field aggrandized too. But also that the free electronic collision frequency in two phase mixture of air-droplet increases every second, and that the collision ionization energy can be reduced, the adhesion coefficient of collision ionization increases, and that ion effective adhesion coefficient increases, and that water mist to the electronic affinity is higher and migration rate of iron is lower. So these factors contribute to the aerosol mixture discharged with a higher voltage, and it is favourable to improve dust performance. Source


Chen Z.-Y.,Jiangxi University of Science and Technology | Chen Z.-Y.,Jiangxi Key Laboratory of Mining and Metallurgy Environmental Pollution Control | Bo J.,Jiangxi University of Science and Technology | Bo J.,Jiangxi Key Laboratory of Mining and Metallurgy Environmental Pollution Control | And 2 more authors.
BioTechnology: An Indian Journal | Year: 2014

By the principle of conservation of mass and conservation of momentum on the breakdown section in the system of coal-rock, not only the cusp mutation models on coal and gas outburst are constructed, but also the expressions necessary of occurring coal and gas outburst and sufficient conditions are derived, for the sake of revealing the mechanism of coal and gas outburst. So, the mechanism of coal and gas outburst is analyzed. The gas pressure in front of the driving face the stress concentration belt is greater than or equal to 0.1897MPa, it satisfies the necessary conditions to the tunneling working surface mutations to occurring coal and gas outburst. This study results avail for analyzing and predicting coal and gas outburst at scene. © Trade Science Inc. Source

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