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Browsing by Author "Van Vuuren, DS"

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Analogy and differences between aluminium and titanium electrowinning

Author: Van Vuuren, DS ; Engelbrecht, AD ; Hadley, TD Date: Sep 2006 Titanium is the ninth most abundant element and the forth most common construction metal in the earth’s crust. It’s high strength, high-temperature performance, low density, high corrosion resistance and bio-compatibility makes it the ideal ... Read more
Challenges experienced in scaling-up the CSIR-Ti process

Author: Oosthuizen, SJ ; Swanepoel, JJ ; Van Vuuren, DS Date: Oct 2014 The CSIR-Ti process produces titanium metal powder through continuous stepwise metallothermic reduction of titanium tetrachloride (TiCl(sub4)) in molten salt medium, and represents a cost-effective alternative to the standard Kroll process ... Read more
Direct reduction process using fines and with reduced CO2 emission

Author: Morrison, A ; Hietkamp, S ; Van Vuuren, DS Date: Aug 2004 A direct reduction process for refractory oxides and a life cycle analysis comparison with conventional pelletising and sintering process for chargechrome are presented. The new route has potential to reduce the environmental impact of the ... Read more
Electrowinning molten titanium from titanium dioxide

Author: Van Vuuren, DS ; Engelbrecht, AD ; Hadley, TD Date: Oct 2005 The value chain of titanium products shows that the difference between the cost of titanium ingot and titanium dioxide is about $9/kg titanium. In contrast, the price of aluminium, which is produced in a similar way, is only about $1.7/kg. ... Read more
The hydrogen economy- A debate on the merits

Author: Van Vuuren, DS Date: Jan 2007 In a hydrogen economy, hydrogen is expansively being used as a means to store, distribute, and convert energy into other useful forms. Hydrogen is expensive, an efficient energy carrier, is dangerous and has low energy density. Of concern ... Read more
Investigating improvements on redox flow batteries

Author: Swartbooi, Ashton M ; Van Vuuren, DS Date: Sep 2006 As fossil fuel resources become depleted and concerns about global warming increases, focus on renewable energy sources will become more urgent. The problem however is the intermittent nature of these sources, which necessitates the need for ... Read more
Leachability of nitrided ilmenite in hydrochloric acid

Author: Swanepoel, JJ ; Van Vuuren, DS ; Heydenrych, M Date: Oct 2010 Titanium nitride in upgraded nitrided ilmenite (bulk of iron removed) can selectively be chlorinated to produce titanium tetrachloride. Except for iron, most other components present during this low temperature (ca. 200 °C) chlorination ... Read more
Mechanistic model for dispersion coefficients in bubble column

Author: Skosana, PJ ; Van Vuuren, DS ; Heydenrych, MD Date: May 2015 A mechanistic model describing the mass and momentum exchange in bubble columns is proposed that is based on the observations that the gas distribution in a bubble column is not uniform across the column and that as a consequence large liquid ... Read more
Opportunities in the electrowinning of molten titanium from titanium dioxide

Author: Van Vuuren, DS ; Engelbrecht, AD ; Hadley, TD Date: Oct 2005 The value chain of titanium products shows that the difference between the cost of titanium ingot and titanium dioxide is about $9/kg titanium. In contrast, the price of aluminum, which is produced in a similar way, is only about $1.7/kg. ... Read more
Selective recovery of titanium dioxide from low grade sources

Author: Van Vuuren, DS ; Stone, AK Date: Sep 2006 There are a number of readily available, large reserves of titanium dioxide bearing minerals from which the titanium dioxide cannot currently be economically recovered via current commercial recovery processes due to: The grade of titanium ... Read more
Wall heat transfer coefficient in a molten salt bubble column: testing the experimental setup

Author: Skosana, PJ ; Van Vuuren, DS ; Heydenrych, MD Date: Oct 2014 One of the advantages of bubble columns is high heat transfer rates. High heat transfer is important in reactors when high thermal duties are required. An appropriate measurement of heat transfer coefficient is of primary importance for ... Read more

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Browsing by Author "Van Vuuren, DS"

Browsing by Author "Van Vuuren, DS"

Browse

All of ResearchSpace

Quick Links

Legislation and compliance

General Enquiries

Social Connect