GETTING HUMATE IN A COAL OXIDATION PROCESS

2020 ◽  
Vol 3 (441) ◽  
pp. 22-29
Author(s):  
P.N. Naguman ◽  
◽  
A.A. Zhorabek ◽  
A.T. Takibayeva ◽  
I.V. Kulakov ◽  
...  
Keyword(s):  
Oxidation Process ◽  
Coal Oxidation

scholarly journals Influence of Cu(СH3COO)2 promoting additive on bituminous coal oxidation process

2018 ◽  
Vol 194 ◽  
pp. 01034
Author(s):  
Darya Bolgova ◽  
Kirill Larionov ◽  
Andrey Zenkov ◽  
Stanislav Yankovsky
Keyword(s):  
Bituminous Coal ◽  
Catalytic Effect ◽  
Initial Temperature ◽  
Oxidation Process ◽  
Copper Acetate ◽  
Maximum Temperature ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Coal Oxidation ◽  
Active Oxidation

The process of coal oxidation with applied Cu(СH3COO)2 additive was studied by the capillary incipient wetness impregnation method with 5% mass concentration. The experiment was conducted by thermogravimetric analysis at a heating rate of 2.5°C/min to a maximum temperature of 600°C in atmospheric air. It was established that application of the initiation additive leads to a significant reduction in the initial temperature of sublimation and active oxidation of volatile compounds (ΔTi = 78°C) and the oxidation end temperature (ΔTf = 64°C). It was established that in the presence of copper acetate the nature of coal oxidation reaction significantly changes (DTG data). The parameters of the coals oxidation process in the presence of copper acetate were determined, and an assumption was made about the presence of a composite catalytic effect.

scholarly journals Influence of NaNA3and CuSO4catalytic additives on coal oxidation process kinetic dependencies

2016 ◽  
Vol 91 ◽  
pp. 01007 ◽  
Author(s):  
Kirill B. Larionov ◽  
Il’ya V. Mishakov ◽  
Alexandr A. Gromov ◽  
Andrey V. Zenkov
Keyword(s):  
Oxidation Process ◽  
Coal Oxidation ◽  
Process Kinetic

Magnetic Properties Study of Coal Oxidation Process

2003 ◽  
Vol 437-438 ◽  
pp. 495-498
Author(s):  
B. Kurniawan, Supiyanto ◽  
Sugih Sugiharto ◽  
J. Jamaludin ◽  
L. Hermanto ◽  
S. Soejati ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Oxidation Process ◽  
Coal Oxidation

Oxidation kinetics of Jurassic coal in Northwest China at low temperature by TG and FTIR analysis

2020 ◽  
Author(s):  
Kai Wang ◽  
Haohao Fan ◽  
Yunzhong He ◽  
Jun Deng ◽  
Yanni Zhang
Keyword(s):  
Low Temperature ◽  
Oxidation Kinetics ◽  
Oxidation Process ◽  
Model Fitting ◽  
Mass Gain ◽  
Northwest China ◽  
Coal Oxidation ◽  
Heating Rates ◽  
Air Atmosphere ◽  
Jurassic Coal

<p>The spontaneous combustion risk of Jurassic coal in Northwest China is special and different from that of permo-carboniferous coal. TG-FTIR experiments of a typical Jurassic coal sample in north Shaanxi was carried out to identify the grading, gas graduating and oxidation kinetics characteristic, under four heating rates of 5, 10, 15, and 20 ℃·min<sup>–1</sup> in an air atmosphere. The coal oxidation process of Jurassic coal at low temperature could be divided into two stages, mass loss stage and mass gain stage. The changing rules of apparent activation energy in the coal oxidation process at low temperature were determined by FWO and Kissinger methods. The model-fitting mathematical approach was used to identify the reaction kinetics mechanism functions at two oxidation stages of Jurassic coal in northwest China.</p>

Application of Attenuated Total Reflection Infrared Spectroscopy to the Characterization of Coal

1986 ◽  
Vol 40 (7) ◽  
pp. 998-1004 ◽  
Author(s):  
Jerzy A. Mielczarski ◽  
Andrzej Deńca ◽  
Jerzy W. Strojek
Keyword(s):  
Oxidation Process ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Low Rank ◽  
Carboxyl Groups ◽  
Coal Oxidation ◽  
Atr Spectroscopy ◽  
Special Time ◽  
Low Rank Coals

Attenuated total reflection (ATR) spectroscopy in the infrared has been applied to the study of the surface structure of various rank coals. No special time-consuming pretreatment of the sample is required which could effect the results. The sample is simply contacted with a reflection element. The method offers a possibility of a spectral study of the surface of the coal samples with graining up to several dozens of micrometers, and the scattering effect is not observed. In the low-temperature (130°C) coal oxidation process a formation of carbonyl and carboxyl groups (the band at 1700 cm−1) and a change in intensity for the rest of the bands have been observed. Oxidation of low-rank coals causes changes mainly in the aliphatic groups of the coal, while in the case of the highest-rank coal the changes in the aromatic structures are more marked.

Control of Metal Alloy Oxidation with Electric Fields

1973 ◽  
Vol 31 ◽  
pp. 164-165
Author(s):  
R. R. Dils ◽  
P. S. Follansbee
Keyword(s):  
Electric Fields ◽  
Oxidation Process ◽  
Base Alloy ◽  
Oxide Surface ◽  
Platinum Electrodes ◽  
Insulating Layer ◽  
Iron Base Alloy ◽  
Alloy Oxidation ◽  
Aluminum Oxide Layer ◽  
And Control

Electric fields have been applied across oxides growing on a high temperature alloy and control of the oxidation of the material has been demonstrated. At present, three-fold increases in the oxidation rate have been measured in accelerating fields and the oxidation process has been completely stopped in a retarding field.The experiments have been conducted with an iron-base alloy, Pe 25Cr 5A1 0.1Y, although, in principle, any alloy capable of forming an adherent aluminum oxide layer during oxidation can be used. A specimen is polished and oxidized to produce a thin, uniform insulating layer on one surface. Three platinum electrodes are sputtered on the oxide surface and the specimen is reoxidized.

Structural Imperfections in thin Oxide Films Formed on Some Fe- and Ni-Base Alloys

1970 ◽  
Vol 28 ◽  
pp. 510-511
Author(s):  
L. P. Lemaire ◽  
D. E. Fornwalt ◽  
F. S. Pettit ◽  
B. H. Kear
Keyword(s):  
Oxide Scale ◽  
Oxidation Process ◽  
Short Circuit ◽  
Protective Oxide ◽  
Protective Oxide Scale ◽  
Thin Oxide Films ◽  
Diffusion Paths ◽  
Oxidation Resistant ◽  
Structural Imperfections ◽  
Short Circuit Diffusion

Oxidation resistant alloys depend on the formation of a continuous layer of protective oxide scale during the oxidation process. The initial stages of oxidation of multi-component alloys can be quite complex, since numerous metal oxides can be formed. For oxidation resistance, the composition is adjusted so that selective oxidation occurs of that element whose oxide affords the most protection. Ideally, the protective oxide scale should be i) structurally perfect, so as to avoid short-circuit diffusion paths, and ii) strongly adherent to the alloy substrate, which minimizes spalling in response to thermal cycling. Small concentrations (∼ 0.1%) of certain reactive elements, such as yttrium, markedly improve the adherence of oxide scales in many alloy systems.

Novel CO2-Thermic Oxidation Process with Mg-Based Intermetallic Compounds and Its Application to Energy Storage Materials

2018 ◽  
Author(s):  
Younghwan Cha ◽  
Jung-In Lee ◽  
Panpan Dong ◽  
Xiahui Zhang ◽  
Min-Kyu Song
Keyword(s):  
Intermetallic Compounds ◽  
Oxidation Process ◽  
Value Added ◽  
Energy Storage Materials ◽  
Reaction Products ◽  
Materials Synthesis ◽  
Energy Materials ◽  
A Value ◽  
Carbon Coated ◽  
Novel Strategy

A novel strategy for the oxidation of Mg-based intermetallic compounds using CO<sub>2</sub> as an oxidizing agent was realized via simple thermal treatment, called ‘CO2-thermic Oxidation Process (CO-OP)’. Furthermore, as a value-added application, electrochemical properties of one of the reaction products (carbon-coated macroporous silicon) was evaluated. Considering the facile tunability of the chemical/physical properties of Mg-based intermetallics, we believe that this route can provide a simple and versatile platform for functional energy materials synthesis as well as CO<sub>2</sub> chemical utilization in an environment-friendly and sustainable way.

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