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Pyrite-gold recovery in copper rougher flotation tailings
No full textThe present study investigates the effect of regrinding and aeration on the separation of pyrite from gold in copper rougher flotation tailings (0.07% Cu, 0.61g/t Au, tail grades). An aeration stage was applied both at the head of copper flotation (copper rougher feed) and after regrinding of the copper rougher tailings, before gold/pyrite selective flotation. Also, different collector regimes, involving sodium iso-butyl xanthate (SIBX) and N-butoxycarbonyl-nbutyl thionocarbamate (XD5002), have been tested. It was found that aeration of the copper rougher feed produced lower gold (71%) and copper (95%) recoveries than the non-aeration of the copper rougher feed (73% Au and 98% Cu recoveries). Fine regrinding of the copper rougher tails increased both gold and copper recoveries in the subsequent flotation stage, due to improved liberation. The highest gold recovery from the rougher tailings (45%) was achieved without aeration of the reground product. However, in these conditions poor rejection of pyrite was achieved, and the concentrate gold grade was low (1.3 g/t, versus 2.3 g/t obtained after aerating the pulp). With respect to the collector scheme, increased gold and copper recoveries were achieved blending the two collectors (SIBX and XD5002) compared to XD5002 alone. However, higher gold (3.0 g/t) and copper (1.0%) grades were observed with XD5002 alone, due to better pyrite rejection. This is believed to be due to the high affinity of xanthates (e.g., SIBX) for the copper activated pyrite.
Commuting by car : weight gain among physically active adults
No full textConclusions: Over 4 years, those who used cars daily for commuting tended to gain more weight than those who did not commute by car. This relationship was pronounced among those who were physically active during leisure time. Reducing sedentary time may prevent weight gain among physically active adults.
High neighborhood walkability mitigates declines in middle aged and older adults walking for transport
No full textConclusions: High-walkable neighborhoods may help middle-to-older aged adults to maintain their walking for transport.
Investigation of alkaline cover performance for abatement of ARD from waste rock dumps at Savage River
No full textThe Savage River iron ore mine in north-west Tasmania, Australia, is surrounded by areas of high wilderness value, including the Savage River National Park. Acid rock drainage (ARD) emanating from legacy (sulphide containing) waste rock dumps at the mine site, which flows into both Main Creek and Savage River, has caused environmental harm to the river and its tributaries. The historic B-dump was identified as a significant source of ARD at the site. In 2006, combined water shedding and alkaline (calcite-chlorite schist) covers were constructed over the dump for long-term ARD control. As part of the AMIRA International funded project "Alternative Treatment Options for Long-term ARD Control" (P933A) a survey of the B-dump calcite-chlorite schist (CCS) side cover was carried out. Combined excavation and drill core sampling of the dump and CCS side cover was undertaken after the cover had been in place for about five years. This paper focuses on the results from our investigations of water samples taken from B-dump seeps and solid samples, in particular, drill core samples taken from different layers of the cover and original ARD rock within the dump. A mineralogical survey, geochemical characterisation and surface analysis of pyrite in each of the layers were undertaken.
Consumer Behavior Insights, Consumption Dynamics, and Segmentation of the Japanese Wine Market
No full textThis exploratory study provides insights into the consumer behavior characteristics and consumption dynamics of Japanese wine consumers, explores the validity of existing generic consumer segmentation of the Japanese market, and considers its suitability to predict wine-purchasing behavior. The importance of product choice factors used in the wine-buying decision-making process is determined, with taste, style, color, price, and recommendations from friends forming the top five. The Japanese consumers’ preference for country-of-origin (COO) wine brands is shown to differ considerably, depending on the consumption situation and level of perceived social risk. Whereas consumers are overall more COO brand loyal to Old World produced wines, women favor wines from New World wine countries. Finally, information generated from the study shows similarities to existing Japanese consumer market segmentation
Coordinated charging of electric vehicles
No full textAn electric vehicle will typically need to charge for a few hours overnight. Coordinating the charging of electric vehicles distributed over many premises in an area can smooth the total demand in that area. In this paper we describe a simple load control system that uses signals broadcast from street transformers, typically servicing 30–50 premises, to influence the behaviour of smart appliances in the supplied premises to control the demand profile.
Exhibited in new work
No full textAurelia Carbone's illusionary tableaux - which come with narratives drawn from the fantastical world of childhood - might at first appear to be digitally manipulated but are in fact physically constructed and then carefully captured with a 4x5 large format camera. Also showing are Adelaide-based artists Bridget Currie and Beverley Southcott (Australian Art Collector)
