ORCID Profile
0000-0001-9939-8810
Current Organisation
University of Queensland
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Mineral Processing/Beneficiation | Resources Engineering and Extractive Metallurgy
Concentrating Processes of Base Metal Ores (excl. Aluminium and Iron Ores) | First Stage Treatment of Ores and Minerals not elsewhere classified |
Publisher: Elsevier BV
Date: 07-2011
Publisher: American Chemical Society (ACS)
Date: 19-07-2016
DOI: 10.1021/ACS.LANGMUIR.6B00211
Abstract: Xanthate-functional polymers represent an exciting opportunity to provide temperature-responsive materials with the ability to selectively attach to specific metals, while also modifying the lower critical solution temperature (LCST) behavior. To investigate this, random copolymers of poly(N-isopropylacrylamide) (PNIPAM) with xanthate incorporations ranging from 2 to 32% were prepared via free radical polymerization. Functionalization with 2% xanthate increased the LCST by 5 °C relative to the same polymer without xanthate. With increasing xanthate composition, the transition temperature increased and the transition range broadened until a critical composition of the hydrophilic xanthate groups (≥18%) where the transition disappeared completely. The adsorption of the polymers at room temperature onto chalcopyrite (CuFeS2) surfaces increased with xanthate composition, while adsorption onto quartz (SiO2) was negligible. These findings demonstrate the affinity of these functional smart polymers toward copper iron sulfide relative to quartz surfaces, presumably due to the interactions between xanthate and specific metal centers.
Publisher: MDPI AG
Date: 12-05-2017
DOI: 10.3390/MIN7050077
Publisher: Wiley
Date: 20-04-2014
DOI: 10.1002/AIC.14469
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 02-2014
Publisher: Cambridge University Press
Date: 31-08-2017
Publisher: MDPI AG
Date: 12-01-2022
DOI: 10.3390/APP12020750
Abstract: Bubble size measurement is a vital part of flotation system analysis and diagnostics. This work evaluates a commercial camera probe as a novel method for in situ bubble size measurement. This device is compared to the conventional Anglo Platinum Bubble Sizer (Stone ThreeTM). It was found that, in laboratory applications, the in situ bubble size analysis technology appears to be a more user-friendly and reliable option for determining bubble size in flotation, whereas the Anglo Platinum Bubble Sizer is more applicable for full scale industrial work. This probe was then used to conduct a rigorous comparison of the behavior of different frother chemistries at a variety of background solution ionic strength conditions. The critical coalescence concentrations and the minimum Sauter mean bubble diameters were determined. Five frothers were compared in terms of their ability to reduce bubble size and sensitivity to salinity. In order to adjust plant recipe and control strategy accordingly, it is recommended that the plant would need to use less frother during periods of the high salinity of process water to achieve the minimum Sauter mean bubble size.
Publisher: Elsevier BV
Date: 11-2008
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 2015
Publisher: Cambridge University Press
Date: 31-08-2017
Publisher: Elsevier BV
Date: 05-2017
DOI: 10.1016/J.JCIS.2017.01.067
Abstract: Temperature-responsive flocculants, such as poly(N-isopropylacrylamide) (PNIPAM), induce reversible particle aggregation upon heating above a lower critical solution temperature (LCST). The aim of this work is to investigate the aggregation of ground iron ore using PNIPAM and conventional polyacrylamide (PAM) flocculants in a continuously-sheared suspension, through in situ chord length measurements using Focused Beam Reflectance Measurement techniques and real-time imaging of the particle aggregates. In the presence of uncharged PNIPAM, particle aggregation occurs only upon heating to the LCST, and the aggregates continue to grow with further heating. Subsequent cooling re-disperses the aggregates, and repeated heating causes reformation. Unlike uncharged PNIPAM, anionic PNIPAM produces aggregates at temperatures below the LCST due to the polymer chains binding to two different particles via attractive interactions between the acrylic acid groups and the hematite surfaces, and can be added at temperatures above the LCST due to the formation of charge-stabilised micelles. Under continuous shear, the flocculant most able to resist aggregate size reduction was anionic PAM, followed by PAM, anionic PNIPAM, PNIPAM (6MDa), and PNIPAM (122kDa). Reversible aggregate breakage was found with all s les, except with PNIPAM (6MDa) after being subjected to shear rates above 550s
Publisher: Elsevier BV
Date: 10-2011
Publisher: Elsevier BV
Date: 02-2010
DOI: 10.1016/J.JCIS.2009.10.049
Abstract: Poly (N-isopropylacrylamide) (PNIPAM) is a temperature responsive polymer. At temperature below its lower critical solution temperature (LCST 32 degrees C) PNIPAM is soluble in water and hydrophilic. At temperature above the LCST, the polymer becomes hydrophobic and insoluble in water. At temperatures above the LCST, PNIPAM has been shown to induce flotation of previously hydrophilic minerals. The mechanism is believed to be an increase in particle hydrophobicity when PNIPAM adsorbs to the particle surfaces at high temperature. This paper investigates the interaction forces between bare silica surfaces in PNIPAM solutions. The influence of three phase contact angles on these interactions, in the presence of polymers of different molecular weights, is also examined. It was found that the presence of PNIPAM on silica surfaces significantly increases their hydrophobicity at a temperature above the LCST. The AFM measurements of surface forces at high temperature also showed that strong adhesion is present between the PNIPAM coated surfaces, which is absent in the absence of polymer. These findings lead to the conclusion that the detected attractive force and subsequent adhesion result from hydrophobic attraction induced by PNIPAM at temperature above the LCST.
Publisher: Elsevier BV
Date: 11-2007
DOI: 10.1016/J.JCIS.2007.06.067
Abstract: Potentiometric titration measurements as well as rheological measurements of talc aqueous suspensions indicate that the behavior of the New York talc particles is consistent with the presence of a negative charge on their basal planes. The possibility of the presence of a negative electrical charge on the basal planes of talc particles is analyzed in this paper. S les of New York talc were studied using electron microprobe analysis and dehydration techniques and the exact chemical formula of New York talc was determined. It was found that there exists a deficiency of protons in the tetrahedral layers of talc, resulting from substitution of Si(4+) ions with Al(3+) and Ti(3+) ions. The comparison of the level of substitution of Si(4+) ions with ions of a lower valency was found to be of a similar order of magnitude as that found in other talc deposits. This strongly points to the presence of a negative charge on the talc basal planes.
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 09-2009
Publisher: Elsevier BV
Date: 03-2018
Publisher: Faculty of Geoengineering, Mining and Geology, Wrocław University of Technology, Wrocław
Date: 2018
DOI: 10.5277/PPMP18144
Publisher: Elsevier BV
Date: 08-2011
Publisher: Informa UK Limited
Date: 02-08-2016
Publisher: Wiley
Date: 27-05-2009
DOI: 10.1002/CJCE.20177
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 06-2015
Publisher: MDPI AG
Date: 12-06-2023
DOI: 10.3390/MIN13060801
Abstract: The depletion of mining resources forces the mining industry to process more heterogeneous and complex orebodies. The inherent heterogeneity of these orebodies and their relation to processing recoveries have received considerable interest in recent years. The properties of ores, such as mineral composition and association, are known to affect flotation performance. Even ores with similar compositions can vary significantly regarding their texture, where the same minerals can occur in different forms. Therefore, very careful geometallurgical planning is needed to overcome the recovery losses. Glencore’s Mount Isa Copper Operation has reported historical difficulties decreasing the copper losses associated with natural floatable pyrites. Understanding the rock properties of naturally floatable pyrites and how they relate to chalcopyrite losses is crucial for concentrator operations. The Mount Isa geometallurgy team is looking for proxies for predicting copper losses and natural floatable pyrites to improve mine planning. This paper presents an approach for predicting the collector-less flotation of pyrite, as well as chalcopyrite losses from rock properties. The statistical analysis between the rock quality and ore type gives an indication of the chalcopyrite losses and natural floatable pyrites, which has potential use in geometallurgy plans.
Publisher: Elsevier BV
Date: 10-2014
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 10-2010
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 05-2011
Publisher: Informa UK Limited
Date: 04-07-2022
Publisher: Elsevier BV
Date: 02-2011
DOI: 10.1016/J.JCIS.2010.10.016
Abstract: This work investigates the effect of temperature on the size of alumina aggregates formed by flocculation with temperature responsive Poly(N-Isopropylacrylamide)(PNIPAM). The results are discussed in terms of the effects of temperature on particle collision, particle adhesion and aggregate breakage. It was found that the size of alumina aggregates increases with increasing solution temperature. Particle article collision and aggregate breakage are largely unaffected by increasing solution temperature and therefore could not account for the change in aggregate size. The dominant factor in aggregate growth with increasing temperature was found to be the increase in the force of adhesion between alumina particles. The appearance of the adhesive force is triggered by the increase in temperature above the lower critical solution temperature of PNIPAM.
Publisher: Elsevier BV
Date: 08-2018
Publisher: Informa UK Limited
Date: 09-2007
Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 07-2018
Start Date: 07-2020
End Date: 07-2027
Amount: $35,000,000.00
Funder: Australian Research Council
View Funded Activity