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Ferrochrome waste management : addressing current gaps
(North-West University (South Africa), Potchefstroom Campus, 2018)
Various chromium (Cr) compounds, Cr metal and/or Cr-containing alloys are used in modern
society. By volume the largest application for Cr is in the production of stainless steel, which
owes its corrosion resistance ...
Unique challenges of clay binders in a pelletised chromite pre–reduction process : a case study
(North-West University, 2011)
As a result of increasing cost, efficiency and environmental pressures ferrochrome producers strive towards lower overall energy consumption. Increases in local electricity prices have placed particular pressure on South ...
Ambient mercury concentrations at industrially influenced sites on the Highveld
(North-West University (South Africa), 2019-05)
Mercury (Hg) is a toxic atmospheric pollutant that has the ability to bio-accumulate in the aquatic food chain, leading to animal and human exposure. During this study, assessments of ambient Total Gaseous Mercury (TGM) ...
Air quality in the Johannesburg–Pretoria megacity : its regional influence and identification of parameters that could mitigate pollution
(North-West University, 2012)
A megacity is generally defined as a city that, together with its suburbs or recognised metropolitan area, has a total population of more than 10 million people. Air pollution in megacities is a major concern due to large ...
Ozone treatment of chromium waste materials
(North-West University, 2011)
Ozonation, or advanced oxidation processes (utilising ozone decomposition products as oxidants) are widely used in industrial waste water and drinking water treatment plants. In these applications the use of ozone is based ...
Temporal assessment of volatile organic compounds at a site with high atmospheric variability in the North–West Province
(North-West University, 2012)
Volatile organic compounds (VOCs) are emitted into the atmosphere from biogenic and
anthropogenic sources with atmospheric lifetimes ranging from minutes to months,
depending on the specific VOC compound considered. It ...
Liberation of chromium from ferrochrome waste materials utilising aqueous ozonation and the advanced oxidation process
(North-West University, 2014)
During ferrochrome (FeCr) production, three types of generic chromium (Cr) containing wastes are generated, i.e. slag, bag filter dust (BFD) and venturi sludge. The loss of these Cr units contributes significantly to the ...
Effects of the chemical composition of coal tar pitch on dimensional changes during graphitization
(2014)
Coal can be converted to different chemical products through processes such destructive distillation. The destructive distillation of coal yields coke as the main product with byproducts such as coal tar pitch (CTP). CTP ...
Characterisation of air masses passing over the Vredefort Dome world heritage site
(North-West University (South Africa), 2015)
In 2007, it was announced that the Vredefort Dome will be proclaimed South Africa’s seventh UNESCO (United Nations Educational, Scientific and Cultural Organisation) world heritage site. It is the largest and second oldest ...
Aqueous solubility speciation of Cr(VI) in ferrochrome bag filter dust
(North-West University, 2015)
The production of ferrochrome (FeCr) from chromite ore is a reducing process, whereby the Cr(III) and Fe(II) in the ore are reduced to metallic chromium (Cr) and iron (Fe) in the final product. FeCr is mostly used for the ...