Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials

Shenyang, China

Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials

Shenyang, China
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Xu Y.,Northeastern University China | 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 | And 8 more authors.
Hydrometallurgy | Year: 2017

Boron concentrate is one of the major products created during the magnetic separation and gravity treatment of ludwigite. Nevertheless, achieving high B2O3 leaching efficiency in alkaline solution is difficult owing to its low B2O3 grade. This study proposes a mechanical activation (MA) method for the pretreatment of boron concentrate and describes the changes in B2O3 leaching rate of boron concentrate as a function of different ball-milling conditions. This work examines the changes in the physicochemical properties change of samples arising as a result of the MA process, in particular by PSD, BET, SEM, XRD, FTIR and TG-DSC analyses. The experimental results show that particle size, specific surface area, crystal structure, stability of chemical bonds, energy accumulation and the B2O3 leaching rate of boron concentrate are all significantly affected by the milling process. The B2O3 leaching rate exhibits an initial increase as the rotation speed and milling time are increased, and the optimum MA conditions are established as 500 rpm and 60 min. Under these conditions, the B2O3 leaching rate increases from 67.52% (unmilled sample) to 89.47%. The decrease in particle size from 13.2 μm to 6.2 μm and the increase in the BET specific surface area from 15.6 m2/g to 27.7 m2/g in samples milled for 60 min produces an increase in the contact area between the sample and the alkaline solution. Additionally, the increased extent of crystal structure amorphization and the weakening of chemical bonds increase the active points on the surface of sample particles or within their lattice structure, thereby facilitating the reaction with the alkaline medium. Finally, the increase in energy and dehydroxylation caused by the milling process increase the OH− absorption during the leaching process. © 2017


Cao X.,Northeastern University China | Cao X.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | Wang H.,Northeastern University China | Meng X.,Northeastern University China | And 5 more authors.
Advanced Materials Research | Year: 2011

High temperature electrochemical synthesis of tungsten boride has been performed in KF-KCl melts with B2O3 and WO3 used as reactants at 1033K. The cathode product was investigated in the current density range 0.4A/cm2-0.6A/cm2and characterized by means of XRD analyses and SEM. The results indicated that cathode product is mainly consist of W2B5 and WB4, the powders are fine (<0.5um). Current density exert a great effect on the phase composition, particle size and morphology of the cathode product. © (2011) Trans Tech Publications, Switzerland.


Xue X.-X.,Northeastern University China | Xue X.-X.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | Wu J.-B.,Northeastern University China | Wu J.-B.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | And 6 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2010

The paper investigated the synthesis of MgAlON-based multiphase powder by carbothermal reduction and nitridation using boron-rich slag as main raw material, carbon black as reductant, silica fume and Al(OH)3 as adjustment components. The effects of carbon content and the MgO content of the ingredients on the synthesis process and phase assembly were studied by X-ray diffraction, scanning electron microscope and energy dispersive X-ray analysis. The results showed that: stoichiometric value of carbon content for the reaction was the most appropriate; with the increase of MgO, the amount of MgAlON(Al23O27N5 · xMgO) gradually increased. x value of 4.5 was the appropriate amount of MgO added in the raw material. Continue to increase the MgO content, MgAlON content changed little, SiAl6O2N6 gradually reduced, while the CaAl4O7 and BN gradually increased.


Liu Y.-H.,Shenyang Ligong University | Zhi Y.,Shenyang Ligong University | Zuo J.-C.,Shenyang Ligong University | Li Y.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | And 3 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2015

Borate whisker/high density polyethylene (HDPE) composite materials were prepared using magnesium borate and aluminum borate whiskers as neutron absorber object. The effects on tensile strength and shielding ratio of the composites were studied and the experiment results were compared with boron carbide (B4C) commonly used as shielding materials. The results show that the shielding ratio of three composite materials to the thermal neutron is B4C>Mg2B2O5>Al4B2O9. The shielding ratio of the composite material increases with borate content and thickness of the composite material. The shielding ratio of the composite material is 86.58% when the thickness of the Mg2B2O5 whisker/HDPE composite material is 15.76 mm. The tensile strength of the whisker/HDPE composite material increases with whisker content. The tensile strength of the Mg2B2O5 whisker/HDPE composite material with 9.1% content of Mg2B2O5 whisker is 24.39 MPa. The composites enhanced by whisker possess prominent mechanical properties compared with B4C/HDPE composite material. ©, 2015, Atomic Energy Press. All right 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 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 Ecologically Comprehensive Utilization of Boron Resource and Materials | Wu J.,Northeastern University China | Wu J.,Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resource and Materials | And 5 more authors.
Advanced Powder Technology | Year: 2012

Boron-rich blast furnace slag of low activity is one of the major products created during the separation of iron and boron from ludwigite in a blast furnace process, and the high-efficiency utilisation of its is of great importance to the Chinese boron industry. This paper proposes one new application process to synthesize α′-Sialon-AlN-BN powders by a carbothermal reduction-nitridation method using boron-rich blast furnace slag as the staring material and describes a series of experimental studies that were performed to elucidate the mechanism of phase formation and microstructure evolution during CRN. The experimental results revealed that the phase compositions and microstructures of the synthesized products were greatly affected by the initial compositions ((Ca,Mg) xSi 12-3 xAl 3xO xN 16-x), x = 0.3-1.8), temperature and holding time. With the compositions shifting from values of x of 0.3-1.8, the relative amount of α′-Sialon, AlN and BN increased gradually, and the amount of α′-Sialon reached a maximum at a value of x of 1.4. The optimal condition for powder synthesis was a temperature of 1480 °C with a holding time of 8 h, under which the crystalline phases included α′-Sialon, AlN, BN and less SiC. More elongated α′-Sialon grains were observed at higher x values and temperatures. During the CRN process, MgAl 2O 4, Mg 2SiO 4, Ca 2Al 2SiO 7, MgSiN 2, β′-Sialon and 27R appeared sequentially as intermediate products. The volatilisation of SiO gas and magnesium vapour resulted in additional weight loss of the samples, which was aggravated with increases in the synthesis temperature and holding time. © 2011 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.


Liu Y.J.,Northeastern University China | Jiang T.,Northeastern University China | Jiang T.,Liaoning key laboratory for recycling science of metallurgy resources | Jiang T.,Liaoning key laboratory for ecologically comprehensive utilization of boron resource and materials | And 6 more authors.
Materials Science Forum | Year: 2015

The low-grade ludwigite is one of the complex and refractory ores. Based on the high energy consumption and inefficient in the grinding process and according to the microwave-assisted grinding principle, this paper studied the microwave absorption property of ludwigite and researched the effect of microwave heating on the grinding efficiency of it. The non-microwaved and microwaved samples were characterized with regard to the chemical components, mineral compositions, macroscopic structure and microstructure, grinding efficiency by methods of the chemical analysis, X-ray diffraction(XRD), scanning electron microscopy(SEM) and grain size analysis, etc. The results indicated that ludwigite, with good microwave absorption property, was suitable for microwave processing. The grindability of microwaved ludwigite was related to the microwave power and microwave heating temperature. By the microwave heating temperature attained 500~650°C, many macro-cracks and micro-cracks were produced by thermal stress between different mineral interfaces, which resulted in the decrease of strength of ludwigite and easy levigation, but the mineral compositions had no obviously changed, which would not affect the subsequent magnetic separation. It was concluded that short, high-power treatments were most effective but over-exposure of the sample led to reductions in efficiency. Under the same conditions, the grinding efficiency of ludwigite was improved 24.54% higher than untreated ore, which significantly improved the grinding efficiency and reduced energy consumption. © (2015) Trans Tech Publications, Switzerland.

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