Search Results - "Beukes, J.P."

Review of Cr(VI) environmental practices in the chromite mining and smelting industry – Relevance to development of the Ring of Fire, Canada by Beukes, J.P., du Preez, S.P., van Zyl, P.G., Paktunc, D., Fabritius, T., Päätalo, M., Cramer, M.

“…During stainless steel production, new chromium units are obtained from ferrochrome, a relatively crude alloy produced from chromite ore. Large chromite…”
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Utilisation of pre-oxidised ore in the pelletised chromite pre-reduction process by Kleynhans, E.L.J., Neizel, B.W., Beukes, J.P., van Zyl, P.G.

“…•Pre-oxidation of chromite ore enhance chromite pre-reduction.•Optimum pre-oxidation temperature was 1000°C for the case study ore.•Fe migration from the…”
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Sodium Silicate Cold-Bonded Chromite Pellets for the Ferrochromium Industry – Identifying a Suitable Process by du Preez, S.P., Maree, Z., Beukes, J.P.

“…Abstract Chromite fines (defined as particles smaller than 6 mm) account for a significant fraction of mined South African chromite ore. These fines are…”
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Recycling pre-oxidized chromite fines in the oxidative sintered pellet production process by du Preez, S.P., Beukes, J.P., Paktunc, D., van Zyl, P.G., Jordaan, A.

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The use of satellite observations of fire radiative power to estimate the availabilities (activity patterns) of pyrometallurgical smelters by Beukes, J.P., Van Zyl, P.G., Sofiev, M., Soares, J., Liebenberg-Enslin, H., Shackleton, N., Sundström, A.M.

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Cr(VI) generation during sample preparation of solid samples - a chromite ore case study by Glastonbury, R.I ., Stewart, H.M., Beukes, J.P., Lachmann, G., Dawson, N.F., Van der Merwe, W., Van Zyl, P.G., Steenkamp, C.J.H.

“…South Africa holds more than 70% of the world's viable chromite ore reserves and produces ∼46.2% of the world's high carbon ferrochrome. It was recently…”
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Corrections and amendments Retraction: New particle formation events in semiclean South African Savannah by Vakkari, V, Laakso, H, Kulmala, M, Laaksonen, A, Mabaso, D, Molefe, M, Kgabi, N, Beukes, J.P, Laakso, L

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Concentration contextualisation, temporal patterns and sources of hydrogen sulphide at a site on the South African Highveld by Cogho, E., Beukes, J.P., van Zyl, P.G., Vakkari, V., Laakso, L., Josipovic, M., Kulmala, M.

“…South Africa is one of the largest atmospheric sulphur emitting countries, but the contribution of H2S to this regional burden is not known. Also, no H2S…”
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Factors governing the chemical composition of rain at a regional site in South Africa by Kok, L., van Zyl, P.G., Beukes, J.P., Burger, R.P., Ellis, S.M., Josipovic, M., Jaars, K., Vakkari, V., Laakso, L., Kulmala, M.

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Chemical beneficiation of chromite ore to improve the chromium-to-iron ratio for ferrochrome production by Kleynhans, E.L.J., Beukes, J.P., van Zyl, P.G., du Preez, S.P.

“…•FeCr producers are only renumerated for the Cr content.•The Cr/Fe ratio of chromite can be altered by metalising and leaching Fe.•Chromite spinel was altered…”
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Technical note Cr(VI) generation during milling by Beukes, J.P., Guest, R.N.

“…An investigation of the dry milling of chromite at a ferroalloy producer revealed high Cr(VI) concentrations in the milled ore. This promted further…”
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The chemical composition and fluxes of atmospheric wet deposition at four sites in South Africa by Conradie, E.H., Van Zyl, P.G., Pienaar, J.J., Beukes, J.P., Galy-Lacaux, C., Venter, A.D., Mkhatshwa, G.V.

“…South Africa is the economic hub of southern Africa and is regarded as an important source region of atmospheric pollutants. A nitrogen dioxide (NO2) hotspot…”
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Twenty-one years of passive sampling monitoring of SO2, NO2 and O3 at the Cape Point GAW station, South Africa by Swartz, J.-S., Van Zyl, P.G., Beukes, J.P., Labuschagne, C., Brunke, E.-G., Portafaix, T., Galy-Lacaux, C., Pienaar, J.J.

“…Sulphur dioxide (SO2), nitrogen dioxide (NO2) and ozone (O3) are considered typical inorganic gaseous pollutants in the atmosphere. The aim of this study was…”
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Chemical composition of rain at a regional site on the South African Highveld by Kok, L, van Zyl, PG, Beukes, JP, Swartz, J-S, Burger, R.P, Ellis, Suria, Josipovic, M, Vakkari, V, Laakso, L, Kulmala, M

“…Relatively limited data have been published on the chemical composition of wet deposition for South Africa, which is considered an important source region for…”
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Why is CaCO3 not used as an additive in the pelletised chromite pre-reduction process? by Neizel, B.W., Beukes, J.P., van Zyl, P.G., Dawson, N.F.

“…► CaCO3 addition enhanced pelletised chromite pre-reduction significantly. ► Especially iron pre-reduction rates seemed to be enhanced. ► Pre-reduced pellet…”
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Determining the baking isotherm temperature of Söderberg electrodes and associated structural changes by Shoko, L., Beukes, J.P., Strydom, C.A.

“…•Thermomechanical analysis was used to assess coal tar pitches.•The baking isotherm temperature was found to be between 450 and 475°C.•This temperature was…”
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Characterisation and liberation of chromium from fine ferrochrome waste materials by van Staden, Y., Beukes, J.P., van Zyl, P.G., du Toit, J.S., Dawson, N.F.

“…•Cr liberation from ferrochrome bag filter dust and ultra-fine slag was investigated.•Aqueous ozonation and the advanced oxidation process were evaluated.•More…”
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The Effect of Carbonaceous Reductant Selection on Chromite Pre-reduction by Kleynhans, E. L. J., Beukes, J. P., Van Zyl, P. G., Bunt, J. R., Nkosi, N. S. B., Venter, M.

“…Ferrochrome (FeCr) production is an energy-intensive process. Currently, the pelletized chromite pre-reduction process, also referred to as solid-state…”
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Cr(VI) and Conductivity as Indicators of Surface Water Pollution from Ferrochrome Production in South Africa: Four Case Studies by Loock-Hattingh, M. M., Beukes, J. P., van Zyl, P. G., Tiedt, L. R.

“…South Africa is one of the largest ferrochromium (FeCr) producers. Most FeCr is exported to developed countries. Therefore the impact of this industry is of…”
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Cr(VI) Generation During Flaring of CO-Rich Off-Gas from Closed Ferrochromium Submerged Arc Furnaces by du Preez, S. P., Beukes, J. P., van Zyl, P. G.

“…Ferrochromium (FeCr) is the only source of new Cr units used in stainless steel production, which is a vital modern day alloy, making FeCr equally important…”
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