scholarly journals Effect of Sodium Borate on the Preparation of TiN from Titanomagnetite Concentrates by Carbothermic Reduction–Magnetic Separation and Acid Leaching Process

Minerals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 675 ◽  
Author(s):  
Wen Yu ◽  
Xiaojin Wen ◽  
Jiangan Chen ◽  
Qiongyao Tang ◽  
Wen Dong ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Carbothermic Reduction ◽  
Acid Leaching ◽  
Sodium Borate ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
Reduction Behavior ◽  
Direct Reduced Iron ◽  
Reduced Products ◽  
Spinel Mgal2o4

Carbothermic reduction–magnetic separation and acid leaching processes were used to produce TiN and direct reduced iron (DRI) from titanomagnetite concentrates. The effects of sodium borate on the reduction behavior of TMCs, the magnetic separation of the reduced products, and the purification of the impure TiN by acid leaching were investigated. Results of x-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy analysis showed that magnesium aluminate spinel (MgAl2O4) was generated in the reduced products, which could hinder the purification of the TiN. Adding sodium borate not only inhibited the formation of MgAl2O4, but also promoted the formation of TiN by decreasing the roasting temperature and time. Adding sodium borate slightly affected the separation of metallic Fe and TiN. By adding 16% sodium borate, a DRI with 94.3% Fe, 0.6% Ti, and 0.1% V was obtained by magnetic separation. After HCl + HF leaching, the TiN product containing 74.1% Ti and 2.8% V was obtained with the Ti recovery of 94.6% and V recovery of 58.3%.

scholarly journals Preparation of Direct Reduced Iron and Titanium Nitride from Panzhihua Titanomagnetite Concentrate Through Carbothermic Reduction-Magnetic Separation

Minerals ◽  
2017 ◽  
Vol 7 (11) ◽  
pp. 220 ◽  
Author(s):  
Wen Yu ◽  
Xiaojin Wen ◽  
Jiangan Chen ◽  
Jingzhong Kuang ◽  
Qiongyao Tang ◽  
...  
Keyword(s):  
Titanium Nitride ◽  
Magnetic Separation ◽  
Carbothermic Reduction ◽  
Direct Reduced Iron

scholarly journals Phase Transformation of Alumina, Silica and Iron Oxide during Carbothermic Reduction of Fly Ash for Ceramics Production

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1165
Author(s):  
Qingchun Yu ◽  
Yong Deng ◽  
Yuebin Feng ◽  
Ziyong Li
Keyword(s):  
Phase Transformation ◽  
Fly Ash ◽  
Carbothermic Reduction ◽  
Energy Dispersive Spectrometry ◽  
Intermediate Compound ◽  
Added Value ◽  
X Ray Diffraction ◽  
X Ray ◽  
Reduced Products ◽  
Electronic Microscope

Fly ash is a by-product from burning of coal. Utilization of fly ash by carbothermic reduction is an effective way to recover aluminum, silicon, and iron to enhance product-added value. This work is focused on the phase transformation of Al2O3, SiO2 and Fe2O3 during carbothermic reduction of fly ash in air. A comparative analysis of carbothermic reduction of fly ash in air and in nitrogen was made. Thermodynamics analysis was performed to illustrate the possible reactions for residue and condensate. X-ray diffraction (XRD), scanning electronic microscope (SEM), and energy dispersive spectrometry (EDS) were employed to characterize the phase composition, surface morphology, and microstructure of the reduced products. Results show that Fe3Si and Fe2Si appear sequentially with increasing of temperature. Al5O6N is an intermediate compound. Residue of Al9FeSi3, Al, and Si, and condensate of SiC, AlN and C are obtained. β-SiAlON was not found in the residue. Nitrogen is involved in the reduction of Al2O3 but not in the reduction of SiO2 and Fe2O3. Carbothermic reduction of fly ash in air did not behave the same as fly ash in nitrogen.

Leaching Studies of Cement-Glass Package Containing Sodium Borate

1986 ◽  
Vol 84 ◽  
Author(s):  
Masahiro Okamoto ◽  
Koichi Chino ◽  
Tsutomu Baba ◽  
Tatsuo Izumida ◽  
Fumio Kawamura ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Liquid Waste ◽  
Sodium Borate ◽  
Pressurized Water Reactor ◽  
X Ray Diffraction ◽  
Adsorption Ability ◽  
Pressurized Water ◽  
X Ray ◽  
Solidification Reaction ◽  
Main Components

AbstractA new solidification technique using cement-glass, which is a mixture of sodium silicate, cement, additives, and initiator of the solidification reaction, was developed for sodium borate liquid waste generated from pressurized water reactor (PWR) plants. The cement-glass could solidify eight times as much sodium borate as cement could, because the solidifying reaction of the cement-glass is not hindered by borate ions.The reaction mechanism of sodium silicate and phosphoric silicate (initiator), the main components of cement-glass, was studied through X-ray diffraction and compressive strength measurements. It was found that three- dimensionally bonded silicon dioxide was produced by polymerization of the two silicates. The leaching ratio of cesium from the cement-glass package was one-tenth that of the cement one. This low value was attributed to a high cesium adsorption ability of the cement-glass and it could be theoretically predicted accordingly.

Thermoelectric Properties of Mn Doped Cu12-xMnxSb4S13 Tetrahedrites

2016 ◽  
Vol 847 ◽  
pp. 161-165 ◽  
Author(s):  
Ju Yi Wang ◽  
Xiao Ya Li ◽  
Ye Feng Bao
Keyword(s):  
Electrical Conductivity ◽  
Substitution Effect ◽  
Hot Press ◽  
X Ray Diffraction ◽  
Doping Amount ◽  
Spectroscopy Analysis ◽  
Mn Doping ◽  
Thermoelectric Transport Properties ◽  
Hot Press Sintering ◽  
Mn Doped

In this study, Mn doped Cu12-xMnxSb4S13(x=0, 0.5, 1.0, and 2.0) tetrahedrite samples were prepared by melting and annealing followed by hot press sintering. Powder X-ray diffraction and scanning electron microscopy and electron energy dispersive spectroscopy analysis were performed for the samples, and the thermoelectric transport properties of samples were characterized. The experimental results showed that the synthetic tetrahedrites were consisted of principal Cu12Sb4S13 phase and a small amount of secondary Cu3SbS4 and CuSbS2. The electrical conductivity of the tetrahedrites decreased with increasing the Mn doping amount. Contrary to the electrical conductivity, the Seebeck coefficient of the tetrahedrites increased with increasing Mn doping amount. The thermal conductivity decreased with increasing Mn doping amount due to the suppression of the carrier contribution, as well as due to the substitution effect of Mn on the Cu site. For the Mn doped Cu12-xMnxSb4S13 compounds with x=0.5, 1.0, and 2.0, the ZT values decreased with the increase of Mn doping amount, a maximum ZT=0.89 was obtained for the Mn doped compound with x=0.5.

Characterization of New Inorganic- Organic Hybrid Compounds: (C6H10N2).Cl2 (I), [C6H10N2]2ZnCl4 (II): Crystal Structure, Hirschfield Surface, IR and NMR spectroscopy Analysis.

2021 ◽  
Author(s):  
nejeh hannachi ◽  
faouzi hlel
Keyword(s):  
Nmr Spectroscopy ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
Absorption Bands ◽  
Monoclinic System ◽  
Xrd Pattern ◽  
Organic Hybrid ◽  
C Nmr

Abstract Two new organic-inorganic hybrid materials, (C6H10N2).Cl2 (I) and [C6H10N2]2ZnCl4 (II), have been synthesized by hydrothermal method and characterized by single-crystal X-ray diffraction and XRD pattern investigations. These two compounds are crystallized in the monoclinic system; C2/c space group. In the both structures, the anionic-cationic entities are interconnected by hydrogen bonding contacts and p-p Interaction forming three-dimensional networks. Intermolecular interactions were investigated by Hirshfeld surfaces and the contacts of the four different chloride atoms in (II) were compared. The vibrational absorption bands were identified by infrared spectroscopy. These compounds were also investigated by solid state 13C NMR spectroscopy.

Primary beneficiation of tantalite using magnetic separation and acid leaching

2014 ◽  
Vol 21 (12) ◽  
pp. 1153-1159 ◽  
Author(s):  
M. Nete ◽  
F. Koko ◽  
T. Theron ◽  
W. Purcell ◽  
J. T. Nel
Keyword(s):  
Magnetic Separation ◽  
Acid Leaching

scholarly journals Alkali Activation of Oil Shale Ash Based Ceramics

2012 ◽  
Vol 9 (3) ◽  
pp. 1373-1388 ◽  
Author(s):  
A. Hamadi ◽  
K. Nabih
Keyword(s):  
Oil Shale ◽  
Experimental Approach ◽  
Acid Leaching ◽  
Alkali Activation ◽  
X Ray Diffraction ◽  
Oil Shale Ash ◽  
X Ray ◽  
Eds Analysis ◽  
Shale Ash ◽  
Activating Solution

Timahdit oil shale was subjected to firing transformation via ceramics processing followed by alkali activation to synthesis a materials combining the mechanical properties of ceramics and Zeolites. The mineralogical transformations during firing oil shale have been studied. The main crystalline phases found in oil shale ash (OSA) were wollastonite, gehlenite and augite. Modified oil shale ash (MOSA) was obtained with HNO3acid-leaching in the aim to diminish Ca content. Our experimental approach required a NaOH alkaline activating solution with different concentrations (0.5; 1; 2; 4; 6 and 8M). In our study, X-ray diffraction (XDR), Fourier transform infrared (FTIR) and SEM/EDS analysis were used to evaluate the effect of alkali activation on the structural arrangement of the starting materials (OSA and MOSA) in our study. The quantity and the type of the produced zeolites depended critically on the starting materials and on the NaOH concentration.

Microwave-absorbing characteristics of carbothermic reduction products of ilmenite concentrate catalyzed by sodium borate

2016 ◽  
Vol 113 (5) ◽  
pp. 505
Author(s):  
Wei Li ◽  
Yubo Xing ◽  
Binfang Meng ◽  
Xinying Wang ◽  
Yuqi Liu ◽  
...  
Keyword(s):  
Carbothermic Reduction ◽  
Sodium Borate ◽  
Ilmenite Concentrate ◽  
Microwave Absorbing
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