Liaoning Key Laboratory for Recycling Science of Metallurgical Resources

Shenyang, China

Liaoning Key Laboratory for Recycling Science of Metallurgical Resources

Shenyang, China

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Jiang T.,Northeastern University China | Jiang T.,Liaoning Key Laboratory for Recycling Science of Metallurgical Resources | Jiang T.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | Zhang Q.,Northeastern University China | And 4 more authors.
Huagong Xuebao/CIESC Journal | Year: 2014

Based on TG-DTA analysis, boron mud, the solid waste of boron chemical industry, was roasted in a muffle oven and a microwave furnace at different temperatures, and the roasted products were processed through alkaline leaching and acid leaching to extract separately valuable Si and Mg components. The effects of roasting methods and temperature on leaching rates of SiO2 and MgO were investigated. Chemical and phase compositions as well as micro-structures of the roasting products, obtained silica and magnesium oxide were analyzed and characterized by chemical analysis, XRD and SEM. The results indicate that the activity of the boron mud increases after both two types of roasting. The optimal process parameters are 600℃ and 30 min for the roasting in muffle oven and 500℃ and 10 min for doing in microwave furnace. At these conditions, the leaching rates of SiO2 and MgO reach 97.65% and 98.81% for former and 98.03% and 98.83% for later, respectively. The silica prepared, containing 92.20% SiO2, consists of nearly spherical grains with diameter ranges from 100 to 200 nm. And the magnesium oxide obtained, containing 93.05% MgO, makes of plate-like grains with diameter about 2 μm. ©All Rights Reserved


Jiang T.,Northeastern University China | Jiang T.,Liaoning Key Laboratory for Recycling Science of Metallurgical Resources | Jiang T.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | Yin L.,Northeastern University China | And 4 more authors.
Huagong Xuebao/CIESC Journal | Year: 2014

Based on TG-DTA analysis, a sodium-roasting and water-leaching process were employed for the preparation of borax from boron concentrate, using Na2CO3 as sodium treatment reagent. The effects of Na2CO3 content, roasting temperature and holding time on leaching rate of B2O3 were investigated. Phase compositions and morphologies of roasted products and borax were analyzed by XRD and SEM. The results indicate that the optimal processing parameters are fivefold theoretical amount of Na2CO3, molding pressure of 5 MPa, roasting temperature of 850°C and holding time of 3 h. Under these conditions, activation and alkaline hydrolysis of boron mineral are completed synchronously, which make transformation of MgBO2(OH) into soluble Na3BO3and Na2B4O7. The leaching rate of B2O3 in roasted products reaches 91.05%. Well-crystallized borax is obtained from leached filtrate after treatments of removing impurity, evaporation and concentration. © All Rights Reserved.


Jiang T.,Northeastern University China | Jiang T.,Liaoning Key Laboratory for Recycling Science of Metallurgical Resources | Jiang T.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | Zhang Q.,Northeastern University China | And 7 more authors.
Applied Surface Science | Year: 2016

In this study, we employed microwave irradiation for activating boron concentrate, an abundant but low-grade boron mineral resource in China. The boron concentrate was pretreated by microwave irradiation based on TG-DTG-DSC analysis, and the influence of each parameter on processing efficiency was characterized using chemical analysis, XRD, SEM, FTIR and particle distribution analysis. Subsequently, the surface properties of boron concentrate and the mechanism of microwave irradiation was analyzed. Our results indicate that microwave irradiation decreased the processing temperature and shortened the roasting time by accelerating dehydroxylation and oxidation reactions in the boron concentrate, reducing the particle diameter and damaging the microstructure of the minerals, and it increased the B2O3 activity of boron from 64.68% to 86.73%, greater than the optimal conventional treatment. Compared with the simple thermal field, microwave roasting obviously increased ability of the boron concentrate to absorb OH- in the leachant and promoted boron leaching by expanding the contact area of the mineral exposed to leachant, boosting the amount of Mg2+ and Fe3+ on mineral surfaces, and increasing the hydrophilicity of the boron concentrate respectively. It enhanced the γSV LW and γSV - of boron concentrate from 29.15 mJ/m2 and 5.07 mJ/m2 to 37.07 mJ/m2 and 12.41 mJ/m2. © 2016 Elsevier B.V. All rights reserved.


Jiang T.,Northeastern University China | Jiang T.,Liaoning Key Laboratory for Recycling Science of Metallurgical Resources | Liao D.-M.,Northeastern University China | Zhou M.,Northeastern University China | And 7 more authors.
International Journal of Minerals, Metallurgy and Materials | Year: 2015

Experimental studies on the rheological properties of a CaO–SiO2–Al2O3–MgO–TiO2–(TiC) blast furnace (BF) slag system were conducted using a high-temperature rheometer to reveal the non-Newtonian behavior of heterogeneous titanium-bearing molten slag. By measuring the relationships among the viscosity, the shear stress and the shear rate of molten slags with different TiC contents at different temperatures, the rheological constitutive equations were established along with the rheological parameters; in addition, the non-Newtonian fluid types of the molten slags were determined. The results indicated that, with increasing TiC content, the viscosity of the molten slag tended to increase. If the TiC content was less than 2wt%, the molten slag exhibited the Newtonian fluid behavior when the temperature was higher than the critical viscosity temperature of the molten slag. In contrast, the molten slag exhibited the non-Newtonian pseudoplastic fluid characteristic and the shear thinning behavior when the temperature was less than the critical viscosity temperature. However, if the TiC content exceeded 4wt%, the molten slag produced the yield stress and exhibited the Bingham and plastic pseudoplastic fluid behaviors when the temperature was higher and lower than the critical viscosity temperature, respectively. When the TiC content increased further, the yield stress of the molten slag increased and the shear thinning phenomenon became more obvious. © 2015, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.

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