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Effectivity of phenol during solvent extraction of a South African bituminous coal under mild conditions
(ACS, 2017)
Solvent extraction of a South African bituminous coal was carried out under mild conditions (<400 °C) with a holding time of 20 min and an initial nitrogen (N2) pressure of 6 MPa. Thermal degradation of coal with phenol ...
Reducing atmosphere ash fusion temperatures of amixture of coal-associated minerals: the effect of inorganic additives and ashing temperature
(Elsevier, 2014)
The influence of the ashing temperature and inorganic additives on the reducing-atmosphere ash fusion temperatures of a mixture of coal-associated minerals was investigated. Different inorganic compounds were added to the ...
Comparison of sintering and compressive strength tendencies of a model coal mineral mixture heat-treated in inert and oxidizing atmospheres
(Elsevier, 2011)
The chemical interactions responsible for sintering in a coal mineral mixture were investigated in air and in N2. A mineral mixture was made up by mixing kaolin, pyrite, quartz, calcite, hydromagnesite, FeCO3 and anatase ...
Bio-oil production from sweet sorghum bagasse via liquefaction using alkaline solutions and identification of phenolic products
(Springer, 2020)
The feasibility of converting biomass into bio-oil and the effect of an alkaline treatment during biomass liquefaction was studied. Sweet sorghum bagasse (SSB) was treated with NaOH concentrations of 0.5, 1.0, 3.0 and 6.0 ...
Evaluation of mineral matter transformations in low-temperature ashes of South African coal feedstock samples and their density separated cuts using high-temperature X-ray diffraction
(Taylor & Francis, 2020)
Coal mineral matter is the leading cause of inevitable ash problems (fouling and slagging) during the combustion of coal. Low-temperature ash (LTA) samples of feed coals and the density separated fractions were subjected ...
The bipyridine adducts of N-phenyldithiocarbamato complexes of Zn(II) and Cd(II); synthesis, spectral, thermal decomposition studies and use as precursors for ZnS and CdS nanoparticles
(Elsevier, 2015)
Bipyridine adducts of N-phenyldithiocarbamato complexes, [ML12L2] (M = Cd(II), Zn(II); L1 = N-phenyldithiocarbamate, L2 = 2,2′ bipyridine), have been synthesized and characterised. The decomposition of these complexes to ...
Laser-assisted synthesis, and structural and thermal properties of ZnS nanoparticles stabilised in polyvinylpyrrolidone
(Elsevier, 2014)
Zinc sulphide (ZnS) nanoparticles have been synthesised by a green approach involving laser irradiation of an aqueous solution of zinc acetate (Znac2) and sodium sulphide (Na2S·9H2O) or thioacetamide (TAA) in polyvinylpyrrolidone ...
Mineralogy of furnace deposits produced by South African coals during pulverized-fuel combustion tests
(ACS, 2015)
Pilot-scale combustion tests were carried out on coals with low (13.5%) and high (39.6%) ash percentages from the Highveld Coalfield of South Africa, using the ALS-ACIRL 100–200 kW Combustion Test Facility. The mineral ...
Influence of potassium carbonate on the swelling propensity of South African large coal particles
(ACS, 2015)
The swelling propensity of some coals may restrict their use in fixed- and fluidized-bed gasification operations, and effective reduction of swelling can widen the applicability of these coals. Extensive research has been ...
Surfactant mediated synthesis of ZnO nanospheres at elevated temperature, and their dielectric properties
(Elsevier, 2015)
ZnO colloidal spheres were prepared using a simple surfactant mediated approach via a two-stage reaction process, involving the synthesis of nanoparticles and the assembly of the nanoparticles to obtain nanospheres. The ...