ELECTROKINETICS OF OXIDIZED COAL

1990-01-01
SARIKAYA, M
OZBAYOGLU, G
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
237
views
0
downloads
Electrokinetic measurements were carried out in order to determine the properties of oxidized coal surfaces over a wide pH range both in the presence and absence of various metal ions and flotation collectors. It was found that polyvalent cations, such as Fe++, Fe+++ and Al+++ decreased the zeta potential to zero and then reversed the charge. In the presence of cationic collectors, the negative value of zeta potential of oxidized coal was driven positive, below 9.3 to 10.9 depending on the type and concentration of collector used. The infrared spectra of oxidized coal did not indicate any characteristic bands for amine at any pH. These studies demonstrated that amines are not chemically adborbed on oxidized coal surfaces.
Fuel Technology, Energy Engineering and Power Technology, General Chemical Engineering
https://hdl.handle.net/11511/64474
Department of Mining Engineering, Conference / Seminar

Suggestions

Thermal Analysis of Crude oil lignite mixtures by Differential Scanning Calorimetry
Kök, Mustafa Verşan (Elsevier BV, 1994-04-01)
Thermal characterization of lignite, crude oils and their 10 and 20% mixtures were investigated by differential scanning calorimetry (d.s.c.). The calorific value of the lignite increased in mixtures depending on the crude oil type. In pyrolysis runs, temperature ranges where distillation and visbreaking occur were identified for the crude oils studied. The effect of heating rate was also studied, and higher reaction temperatures and higher heat flow rates were observed at d.s.c. peak thermograms with incre...
Microwave heating of coal for enhanced magnetic removal of pyrite
Uslu, T; Atalay, U (Elsevier BV, 2004-01-15)
Amenability of Askale coal to desulfinization by magnetic separation following microwave heating was investigated. The coal was subjected to magnetic separation at 2 T following the treatment in a microwave oven at 850-W power and 2.45-GHz frequency. The increase in magnetic property by microwave heating at 850 W and 2.45 GHz was not sufficient to enhance the removal of considerable amount pyritic sulfur from the coal by magnetic separation at 2 T. Pyritic sulfur content was reduced by 37.46%. With the addi...
SCANNING ELECTRON-MICROSCOPY OF TREATED BITUMINOUS COALS
HUAI, HY; GAINES, AF; FLINT, CD (Elsevier BV, 1992-11-01)
Scanning electron microscopy of particles of three bituminous coals (78.5% C, 81.7% C and 89.9% C d.a.f.) which had been treated with pyridine, methanol, bromine, air, sulfuric acid, ammonia and alkylating agents showed that the reagents produced significant changes in the morphology of the particles. The particles cracked and disintegrated in ways which appear to be characteristic of the disruption of hydrogen bonding, the volume and thermal changes accompanying local reactions and of the breakage of C-C b...
Performance prediction of in situ combustion processes
Kök, Mustafa Verşan (Informa UK Limited, 2001-01-01)
In this research, in situ combustion performance calculations were performed using different algorithms, which were based on oil recovery/volume burned correlative methods. The correlations were based on field and laboratory combustion tube results. A computer method was developed and applied to different heavy crude oil fields. The results showed that an in situ combustion process is applicable in these fields if the volume burned is 30% for field 1 and 40% for field 2.
AIR OXIDATION OF TURKISH BEYPAZARI LIGNITE .2. EFFECT OF DEMINERALIZATION ON STRUCTURAL CHARACTERISTICS IN OXIDATION REACTIONS AT 150-DEGREES-C
AZIK, M; YURUM, Y; GAINES, AF (American Chemical Society (ACS), 1994-01-01)
Demineralized (HCl/HF) samples of Beypazari lignite were oxidized in air at 150 degrees C for up 120 h in a ventilated oven. Elemental analyses, diffuse reflectance Fourier transform infrared (DRIFT), solid-state C-13 CP/MAS/TOSS NMR, and pyrolysis mass (PY-MS) spectroscopies as well as solvent swelling were used for the characterization of the oxidized and unoxidized samples. It was found that the removal of 90.1% of the mineral matter from Beypazari lignite facilitated the access of oxygen into the coal s...
Citation Formats
M. SARIKAYA and G. OZBAYOGLU, “ELECTROKINETICS OF OXIDIZED COAL,” 1990, vol. 24, p. 459, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/64474.
METU IIS - Integrated Information Service open@metu.edu.tr