https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:15251 Wed 11 Apr 2018 15:57:52 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:12528 Wed 11 Apr 2018 13:56:28 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:13592 Wed 11 Apr 2018 12:52:13 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:35220 in operando grinding technique which does not require feedstocks which have been subjected to prior ultrafine grinding nor heat-activation. Concurrent grinding is shown to result in a significant increase in magnesite yields for non-heat activated feedstock, prepared such that fines (<20 µm particles) were excluded from the feed. We assert that concurrent grinding may be a suitable technique for the processing of feedstocks such as those containing significant proportions of forsterite and pyroxene, minerals which are unresponsive to thermal activation for use in aqueous mineral carbonation. This study also investigates the effect of different grinding media particle size on reducing the particle size distribution (PSD) of the feed. Optimum ratio of grinding media size to feed particle size, optimum grinding media and slurry concentrations, optimum time for grinding and optimum impeller designs are determined for the system under study. The quantitative effect of grinding media concentration, slurry concentration, pressure and temperature on magnesite yield has been investigated.]]> Wed 10 May 2023 14:51:12 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32744 Wed 06 Sep 2023 11:51:43 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34070 Wed 06 Feb 2019 09:51:32 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25541 Wed 04 Sep 2019 10:18:36 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51435 Tue 05 Sep 2023 17:54:57 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27155 Tue 04 Jun 2019 13:25:06 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41382 Tue 02 Aug 2022 15:48:24 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45566 Tue 01 Nov 2022 14:39:59 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45168 Thu 08 Feb 2024 10:42:41 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:9490 Sat 24 Mar 2018 08:35:36 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:12073 Sat 24 Mar 2018 08:11:19 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21073 -5, 14(±3) × 10^-5 and 17(±4) × 10^-5 mol m^-2 s^-1 for formic, acetic and DL-lactic acids, respectively. The apparent activation energies amount to 11 ± 3, 47 ± 13 and 52 ± 14 kJ mol^-1 for dissolution in formic, acetic and DL-lactic acids, respectively. These values indicate the initial diffusion limitation in the film around wollastonite particles for formic acid, and kinetic limitation for acetic and DL-lactic acids. The rates of dissolution rapidly decline for acetic and DL-lactic acids, but remain high for formic acid. The findings are altogether indicative of high performance of formic acid for extraction of Ca²⁺ for storing CO₂. Further experiments are needed to assess the recycling of formic acid to determine its overall suitability as a Ca²⁺ carrier for the weak acid process.]]> Sat 24 Mar 2018 07:59:25 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30332 Sat 24 Mar 2018 07:31:49 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47788 Mon 30 Jan 2023 15:16:55 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47580 2) enables its subsequent reaction to form magnesium carbonate, a process called aqueous mineral carbonation. The dissolution rate of magnesium ions (Mg²⁺) from thermally activated serpentine and the factors influencing the rate and extent of dissolution have been studied in our research group. The current contribution focuses on the effect of temperature and pH on the dissolution of heat activated lizardite (a polymorph of serpentine). The extent of dissolution of thermally activated lizardite was measured experimentally as a function of temperature (25 °C≤T≤75 °C) and pH (1.2 ≤ pH≤9.8). It was found that at higher temperatures the level of Mg extraction is greater during the initial stage of dissolution but is then hindered by the re-precipitation of amorphous silica. Thermodynamic modelling was used to assess the susceptibility of solid phase formation and confirmed the likelihood of re-precipitation of amorphous silica from the solutions. For the first time, in this work, the crackling core model (CCM) was used to model experimental data at different pH values.]]> Mon 23 Jan 2023 14:14:29 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43059 Mon 12 Sep 2022 15:12:49 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:35170 Fri 28 Jun 2019 17:14:42 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24039 Fri 04 Nov 2016 15:50:53 AEDT ]]>