scholarly journals Optimization of heating-temperature on carbothermal reduction of alumina for production of aluminum

2018 ◽  
Vol 4 (2) ◽  
Author(s):  
Kenji Itaka ◽  
Amina Chahtou ◽  
Rabie Benioub
Keyword(s):  
Carbothermal Reduction ◽  
Heating Temperature

Synthesis and Electrochemical Properties of LiFePO4C by a Novel Carbothermal Reduction Technology

2011 ◽  
Vol 233-235 ◽  
pp. 1108-1118 ◽  
Author(s):  
Fang Xiang Tan ◽  
Li Li Meng ◽  
Fan Wang ◽  
Hai Feng Su ◽  
Yun Fei Long ◽  
...  
Keyword(s):  
Discharge Capacity ◽  
Carbothermal Reduction ◽  
Sintering Temperature ◽  
Heating Temperature ◽  
Electrochemical Performances ◽  
Optimum Conditions ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Sintering Time ◽  
Temperature Solution

LiFePO4/C composites were synthesized by a novel carbothermal reduction method based on the low-temperature solution reaction between LiNO3-Fe (NO3)3-NH4H2PO4-sucrose. The sucrose amount, sintering temperature, sintering time, and heating temperature for synthesis of LiFePO4/C cathode was optimized. The materials were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) and charge–discharge tests. The results showed that sintering temperature and sucrose amount have more significant effects on discharge capacity than drying temperature and sintering time. Optimum LiFePO4/C was prepared by sintering the precursor obtained by heating at 60 with a sucrose amount of 5.0g at 800.0 for 12 h. Being charged–discharged at 0.5C between 2.5 and 4.2 V, the LiFePO4/C synthesized at the optimum conditions shows good electrochemical performances with an initial discharge capacity of 138.7 mAh·g−1and a capacity retention ratio of 98.6% after 50 cycles.

Synthesis of Al2OC Ceramic Powder by a Carbothermal Reduction Process

2014 ◽  
Vol 881-883 ◽  
pp. 1017-1020
Author(s):  
Shuang Shuang Ding ◽  
Peng Cui ◽  
Hong Xi Zhu ◽  
Cheng Ji Deng ◽  
Chao Yu
Keyword(s):  
Carbothermal Reduction ◽  
Raw Materials ◽  
Heating Temperature ◽  
Ceramic Powder ◽  
Reduction Process ◽  
Synthesis Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Argon Flow ◽  
Micro Morphology

A12OC ceramic powder was successfully synthesized via a carbothermal reduction method using Al2O3, B2O3 and activated carbon powders as raw materials. The effects of synthesis temperature on the phase transformation and micro-morphology of A12OC were investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that the content of A12OC in the products was increased with the increasing heating temperature. The optimized process for preparing A12OC was heating the mixtures at 1700 °C for 2 h in argon flow. A12OC particles synthesized at 1700 °C were hexagon plate-like with thickness of 5 μm and size of about 50 μm. Keywords: A12OC, synthesis, microstructure

Influence of CeO2 Additive on the Phase Transformations of Zirconia from Zircon Ore by Carbothermal Reduction Process

2014 ◽  
Vol 602-603 ◽  
pp. 238-241 ◽  
Author(s):  
Teng Yu Wang ◽  
You Guo Xu ◽  
Zhao Hui Huang ◽  
Ming Hao Fang ◽  
Yan Gai Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Phase Transformations ◽  
Carbothermal Reduction ◽  
Heating Temperature ◽  
Reduction Process ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
X Ray ◽  
Additive Increase ◽  
Scanning Electron

This paper mainly discusses the influences of heating temperatures and CeO2 additive contents on the phase transformations of zirconia from zircon ore by carbothermal reduction. The phase transformations of zirconia from zircon ore by carbothermal reduction were monitored by X-ray diffraction. The microstructure of the product was characterized by scanning electron microscopy. The results show that without adding CeO2, the optimized heating temperature of zircon carbothermal reduction was 1600 °C and the main phases of the product were m-ZrO2, ZrC and β-SiC, t-ZrO2; After adding CeO2, the main phase of the products consists of t-ZrO2, m-ZrO2, ZrC and β-SiC when the heating temperature is 1600 °C. CeO2 additive can be introduced into zirconia lattice and can cause it to form cerium stabilized zirconia. Zirconia in the product would be turned into partially stabilized zirconia with cerium addition from 5 wt% to 20 wt%. However, the form of zirconia in the product is not changed greatly with the amount of CeO2 additive increase.

scholarly journals β-Si3N4 Microcrystals Prepared by Carbothermal Reduction-Nitridation of Quartz

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3622 ◽  
Author(s):  
Meng Zhang ◽  
Zhi Chen ◽  
Juntong Huang ◽  
Saifang Huang ◽  
Zhihui Hu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Formation Mechanism ◽  
Carbothermal Reduction ◽  
Single Phase ◽  
Heating Temperature ◽  
Holding Time ◽  
Spectral Emission ◽  
Reaction Parameters ◽  
Future Potential ◽  
Coke Powder

Single phase β-Si3N4 with microcrystals was synthesized via carbothermal reduction-nitridation (CRN) of quartz and carbon coke powder as starting materials. The effects of reaction parameters, i.e., heating temperature, holding time, C/SiO2 ratio, Fe2O3 additive and β-Si3N4 seeds on the phase transformation and morphology of products were investigated and discussed. Rather than receiving a mixture of both α- and β- phases of Si3N4 in the products, we synthesized powders of β-Si3N4 single polymorph in this work. The mechanism for the CRN synthesis of β-Si3N4 from quartz and the formation mechanism of Fe3Si droplets were discussed. We also firstly reported the formation of Fe3Si Archimedean solids from a CRN process where Fe2O3 was introduced as additive. Comparing to the gear-like short columnar morphology observed in samples without β-Si3N4 seeding, the addition of β-Si3N4 seeds led to an elongated morphology of final products and much finer widths. In addition, the β-Si3N4 microcrystals exhibited a violet‒blue spectral emission range, which could be highly valuable for their future potential optoelectronic applications.

Synthesis of Al4SiC4-Al8SiC7 Composite Powders by Carbothermal Reduction Process

2011 ◽  
Vol 399-401 ◽  
pp. 813-816 ◽  
Author(s):  
Chao Yu ◽  
Wen Jie Yuan ◽  
Jun Li ◽  
Hong Xi Zhu ◽  
Cheng Ji Deng
Keyword(s):  
Carbon Black ◽  
Carbothermal Reduction ◽  
Carbothermic Reduction ◽  
Heating Temperature ◽  
Reduction Process ◽  
Composite Powders

Tabular structure of Al4SiC4-Al8SiC7composites was successfully synthesized using a mixture of calcined bauxite, SiC and carbon black by a carbothermal reduction process. The effects of the amount of SiC addition and the heating temperature on synthesis of Al4SiC4-Al8SiC7composites by carbothermic reduction were investigated. The results show that SiC amount played an important role in the content of the final products. With the increasing of heating temperature, the Al4SiC4content increased and Al8SiC7content decreased in the products, which indicated the formation and growth of Al4SiC4were promoted.

The use of insoluble matter of Moroccan oil shale for removal of dyes from aqueous solution

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Methylene Blue ◽  
Oil Shale ◽  
Heating Temperature ◽  
Blue Dye ◽  
Adsorption Capacities ◽  
Experimental Parameters ◽  
Initial Ph ◽  
New Material ◽  
Activating Agent ◽  
Moderate Cost

The study aims to use an adsorbent natural based of Moroccan oil shale of Timahdit area (Y layer) in a physical-chemical adsorption process for treating industrial discharges colorful. The used adsorbent is the insoluble party of the sub-critical extraction of decarbonized oil shale of Timahdit. The tests performed on the methylene blue (MB), showed a strong elimination in the first 10 minutes. The influences of various experimental parameters were studied: mass ratio of adsorbent, time and temperature of thermal treatment, contact time, pH of MB and heating temperature of solution on the parameters of material were studied. The experimental results have shown that the adsorption of methylene blue dye by the adsorbent is more than 90% at initial pH a range 6-7 at room temperature for 30 minutes. The process is simple and the adsorbent produced is a new material with interesting adsorption capacities of moderate cost which does not require an activating agent and can be used as industrial adsorbent for the decontamination of effluents containing organic pollutants.

Development of new technologies: 1 Control of proteolytic processes during maturation of hard cheese with a high second heating temperature

2020 ◽  
Vol 56 (4) ◽  
pp. 18-20
Author(s):  
A.D. Koval ◽  
◽  
A.N. Belov ◽  
A.V. Grishkova ◽  
A.V. Mironova ◽  
...  
Keyword(s):  
New Technologies ◽  
Heating Temperature ◽  
Hard Cheese

PENGARUH SUHU PEMANASAN FORMALIN 10% TERHADAP PERKEMBANGAN TELUR Ascaris lumbricoides

2018 ◽  
Vol 6 (1) ◽  
Author(s):  
Ni Putu Aryadnyani
Keyword(s):  
Experimental Study ◽  
Environmental Factors ◽  
Ascaris Lumbricoides ◽  
Heating Temperature ◽  
Control Group ◽  
Control Group Design ◽  
Group Design ◽  
Design Result

AbstractBackground Ascaris lumbricoides eggs had very thick walls consisted of three layers, they were albuminoid layer, hyaline layer and vitelin layer. These layers were impermeable causing the Ascaris lumbricoides eggs resistant to less supportive environmental factors. Formalin 10% was a preservative that was often used to preserve faeces containing parasites such as protozoa and worm eggs. However, without heating, formalin 10% was not effective to preserve the Ascaris lumbricoides eggs because they would keep developing to become infective (containing larvae). Objective This study aims to prove whether there is an effect of adding 10% formalin which is heated at 60 C, 70 C and 80 C to the development of Ascaris lumbricoides eggs.Methods The design of this research was an experimental study with The Randomized Posttest Control Group Design. Result The Ascaris lumbricoides eggs were still growing into infective eggs in faeces although they were heated by formalin 10% at 60C, 70C and 80C. conclusion Based on the results of the study, there was no effect of heating temperature of formalin 10% on the development of Ascaris lumbricoides egg.Keywords: Formalin 10%, Ascaris lumbricoides, Heating, Soil Transmitted Helminth

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