Výsledky vyhledávání

Production of sodium-based zeolites and a potassium-containing leach liquor by alkaline leaching of South African coal fines ash

Autor: A.C. Collins, C.A. Strydom, R.H. Matjie, J.R. Bunt, J.C. van Dyk

Publikováno v: Journal of the Southern African Institute of Mining and Metallurgy, Volume: 123, Issue: 3, Pages: 145-155, Published: MAR 2023

South African coal discards derived from feed coal for thermoprocesses pose human health and environmental problems and incur high disposal costs. These issues need to be resolved. Coal fines and a coal fines/ K2CO3 blend were combusted at 700°C in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca489b0e08ed62b7052a1421a306b9ba
https://doi.org/10.17159/2411-9717/1167/2023

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Akademický článek

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Catalytic Effect of Reactive Extraneous Mineral Composite on Product Distribution During Pyrolysis of Highveld Fine-Coal Reject and its Beneficiated Residues

Autor: Katlego Mphahlele, R.H Matjie, J.R Bunt

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::360028c4d98b2377352784bce1536b1f
https://doi.org/10.2139/ssrn.4450328

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Akademický článek

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Interactions between Kaolinite, Organic Matter, and Potassium Compounds at Elevated Temperatures during Pyrolysis of Caking Coal and Its Density-Separated Fractions

Autor: Wilden Stokes, Katlego Mphahlele, Christien A. Strydom, R.C. Uwaoma, John R. Bunt, Hanno Bijzet, R.H. Matjie

Publikováno v: Energy & Fuels. 35:13268-13280

Large coal agglomerates (cakes), which form in slow heating fixed-bed commercial gasifiers, result in low carbon efficiency and carbon loss in the ash assemblage. In an earlier study, laboratory-sc...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a8dfec7183377891c6fa026b2be5fb3a
https://doi.org/10.1021/acs.energyfuels.1c01687

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Production of Al(HI)-K(I)-Ti(IV)-sulphate-containing leach liquor from metakaolinite-containing ash derived from South African coal fines

Autor: A.C. Collins, C.A. Strydom, R.H. Matjie, J.R. Bunt, J.C. van Dyk

Publikováno v: Journal of the Southern African Institute of Mining and Metallurgy, Volume: 122, Issue: 8, Pages: 473-486, Published: AUG 2022

South African discard coal fines and K2CO3 blends were heated in a laboratory-scale rotary kiln to produce ashes for H2SO4 leaching tests. The optimized H2SO4 leaching conditions of 6.12 mol.dm3 (M) H2SO4, solid to liquid ratios 1:5 and 1:10, and 8o�

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::83e6c5ac1cd98513153f5034068acee4
http://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S2225-62532022000800010&lng=en&tlng=en

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The influence of particle size on the thermal performance of coal and its derived char in a Union stove

Autor: Hein W.J.P. Neomagus, John R. Bunt, Frans Waanders, R.H. Matjie, Stuart Piketh, Lungile Sumbane-Prinsloo

Publikováno v: Energy Geoscience, Vol 2, Iss 2, Pp 148-159 (2021)

For low-income communities in South Africa, coal is the most common solid fuel which is burnt in a variety of devices, including imbaulas and cast-iron stoves. The present work was conducted with the aim of determining the effect of the fuel particle

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f643ad6e3ab7ac8b92afeec1d1207012
https://doi.org/10.1016/j.engeos.2020.08.001

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Transformation of inherent and extraneous minerals in feed coals of commercial power stations and their density-separated fractions

Autor: R.H. Matjie, Christien A. Strydom, Rudelle Rautenbach, John R. Bunt

Publikováno v: Energy Geoscience, Vol 2, Iss 2, Pp 136-147 (2021)

The main objective of this work is to relate the coalescence of inherent minerals and the fragmentation of extraneous minerals to the slagging propensities of South African pulverised feed coals during combustion. By incorporating the behaviour of in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::564a4f48a052c9d42c8bcd8cd41add1a
https://doi.org/10.1016/j.engeos.2020.09.002

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Effect of the V5+ to V4+ Molar Ratio on H2S Absorption and Conversion to Elemental Sulfur

Autor: R.H. Matjie, Katlego Mphahlele, Hein W.J.P. Neomagus, Foster Mahlamvana, Makonde Ndou, John R. Bunt

Publikováno v: Industrial & Engineering Chemistry Research. 60:1505-1516

This study assessed V5+ concentration and V5+ to V4+ ratio effects on the H2S absorption and oxidation to elemental sulfur from H2S gas streams in simulated Stretford solutions. Laboratory-derived ...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::df0036b237bd837864fd1f289120c197
https://doi.org/10.1021/acs.iecr.0c05472

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The effect of particle size on the pollution reduction potential of a South African coal-derived low-smoke fuel

Autor: R.H. Matjie, Frans Waanders, Hein W.J.P. Neomagus, Lungile Sumbane-Prinsloo, John R. Bunt, Stuart Piketh

Publikováno v: Energy Geoscience, Vol 1, Iss 3, Pp 165-173 (2020)

The coal combustion in cast-iron stoves leads to health hazards and air pollution. In this study the CO, SO2, NOx, PM and VOC emission concentrations were measured whilst combusting four fuel particle sizes (15, 20, 30, and 40 mm) as well as a compos

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ec5779c34c534af3e85e6cbedd9e5ccc
https://doi.org/10.1016/j.engeos.2020.06.006

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