Characterizing the behaviour of platinum group minerals in a grinding circuit

Xiao, Zhixian; Laplante, A.R.; Tan, Yan‐Xi; Finch, J.A.

doi:10.1016/j.mineng.2021.106863

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…These previous studies 2,13,22,25,26,54 were conducted using aqueous diluted suspensions, and suspensions with more drastic conditions of rheology and concentration of solids are found in industrial processes. 55 For instance, hydrocyclones are used to separate gravel from pseudoplastic drilling fluids; 52 they are also used in offshore heavy oil desanding operations 9 and in the classification of fines in grinding circuits for ore slurries of different concentrations, 56 starch processing plants, and protein separation. 14 Thus, within this framework of different industrial needs under those more drastic suspension conditions, it is interesting to verify the potential of the geometrically optimized hydrocyclone (named in this study as MOEH-Con) operating with non-Newtonian fluids and undiluted suspensions and propose an innovative way of minimizing possible performance losses.…”

Section: Introductionmentioning

confidence: 99%

Study on Filtering Hydrocyclones Operating with Concentrated Non-Newtonian Suspensions

Morimoto,

Gonçalves,

Barrozo

et al. 2023

Ind. Eng. Chem. Res.

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Hydrocyclones are devices used to separate a discrete phase (solid or liquid) from a continuous liquid phase. Although this partition process is simple and versatile, there are limitations when separating concentrated suspensions with high viscosity. By replacing the cylinder or cone walls of hydrocyclones by a permeable wall, our research group developed the so-called filtering hydrocyclones. Although previous studies have shown that filtering hydrocyclones have a better performance than conventional devices of the same geometry, they were performed with diluted Newtonian suspensions. Thus, the aim of the present work is to evaluate the performance of a filtering and a conventional hydrocyclone of the same geometry operating with concentrate suspensions with pseudoplastic rheological behavior. The geometric relationship of these hydrocyclones was obtained in a previous optimization study that aimed at maximizing overall efficiency in aqueous diluted suspensions; this high-efficiency device is known as MOEH. When operating a pseudoplastic fluid with a behavior index equal to 0.6536, there was a 48% decrease in the efficiency of the MOEH hydrocyclone. The MOEH experiments performed with a pseudoplastic suspension containing 9.5 wt % of solids and 0.6 wt % of carboxymethyl cellulose achieved an Euler number of 1108, a split ratio of 44%, and an overall efficiency of 47%. However, the average results demonstrated that the operation with the newly designed filtering hydrocyclone, called MOEH-CoF, led to an Euler number about 10% lower and an overall efficiency about 5% higher than that obtained with the conventional device. The findings of this study can lead to a better understanding of solid–liquid separation in the petrochemical, mineral, and food industries, which generally works with concentrated non-Newtonian fluids.

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Section: Introductionmentioning

confidence: 99%

Study on Filtering Hydrocyclones Operating with Concentrated Non-Newtonian Suspensions

Morimoto,

Gonçalves,

Barrozo

et al. 2023

Ind. Eng. Chem. Res.

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“…Centrifugal gravity concentrators such as the Kneslon Concentrator were developed to improve gold recovery (Knelson, 1992;Knelson and Jones, 1994;Laplante et al, 1995b;Laplante et al, 2000). Subsequently, centrifugal concentrators have been extended to recover PGMs (Xiao et al, 2009;Xiao et al, 2021) and materials of lower density, such as iron ore (Chen et al, 2008;Sakuhuni et al, 2016). Despite the effectiveness of this concentration method, its requirement for large volume of water (Laplante et al, 1995a) has proven to be a huge challenge to the environment, particularly in areas such as South Africa (Habiyaremye, 2020), Chile (Alvez et al, 2020) and China (Jiang, 2009) where water resource is in scarcity.…”

Section: Introductionmentioning

confidence: 99%

A preliminary investigation of dry gravity separation with low specific gravity ores using a laboratory Knelson Concentrator

Zhou¹,

Kökkılıç²,

Langlois³

et al. 2023

Physicochem. Probl. Miner. Process.

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It has become an active research area for treating low specific gravity (SG) deposits by centrifugal separation due to its high efficiency, low cost and minor environmental impact. Laboratory Knelson Concentrator has shown its potential for processing high density ores on a dry basis. This study investigated the feasibility and the optimum operating conditions when processing a dry low SG feed with a modified Knelson Concentrator. A synthetic mixture of magnetite and quartz with a grade of 1% magnetite was used to mimic a low-density ratio ore. Bowl speed (G), air fluidizing pressure (psi) and solids feed rate (g/min) were chosen as the operating variables. Box-Behnken design was used to design the experiments and response surface method was used for optimization. The effects of each individual factors and their interactions on concentrate grade and magnetite recovery were evaluated. The dry process achieved up to 60 % magnetite recovery with an upgrade ratio of 5. The optimized values for the concentration with the highest recovery and grade of bowl speed, solids feed rate and air fluidizing pressure are 27 G, 200 g/min and 12 psi, respectively.

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