Flotation model based on floatability component approach – PGE minerals case

Ruuska, Jari; Lamberg, Pertti; Leiviskä, Kauko

doi:10.3182/20120910-3-jp-4023.00046

Cited by 8 publications

(4 citation statements)

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“…Our approach simulated the behavior of flotation schemes in the beneficiation process through a “three-component” mineral floatability process. It parameterizes the mineral flotation as a first-order kinetic equation. , This model yields the recovery of a mineral R m to the flotation time t as follows where m f and m s represent the proportion of fast and slow particles, respectively; k f and k s represent the flotation rate constant of fast and slow floating particles, respectively; and m n represents the proportion of non-floating particles such that m f + m s + m n = 1.…”

Section: Methodsmentioning

confidence: 99%

Regionalized Life Cycle Inventories of Global Sulfidic Copper Tailings

Adrianto

Pfister

Hellweg

2022

Environ. Sci. Technol.

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Worldwide, an issue of copper production is the generation of mine waste with varying characteristics. This waste can pollute natural environments, and in particular, the heavy metal emissions of the tailings may pose long-term consequences. Currently, life cycle assessments of mine tailings are hampered by both limited data availability in the metal production value chain and lack of appropriate methodologies. We collect data from 431 active copper mine sites using a combination of information available from the market research and technical handbooks to develop site-specific life cycle inventories for disposal of tailings. The approach considers the influences of copper ore composition and local hydrology for dynamically estimating leached metals of tailings at each site. The analysis reveals that together, copper tailings from the large (i.e., porphyry) and medium-size copper deposits (i.e., volcanogenic massive sulfide and sediment-hosted) contribute to more than three quarters of the total global freshwater ecotoxicity impacts of copper tailings. This strongly correlates with hydrological conditions, leading to high infiltration rates. The generated inventories vary locally, even within single countries, showcasing the importance of site-specific models. Our study provides site-specific, dynamic emission models and thus improves the accuracy of tailing’s inventories and toxicity-related impacts.

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Section: Methodsmentioning

confidence: 99%

Regionalized Life Cycle Inventories of Global Sulfidic Copper Tailings

Adrianto

Pfister

Hellweg

2022

Environ. Sci. Technol.

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“…About 70% of these costs are attributed to the particle reduction range from 30-50 mm to 20-50 micron [2,3]. Research should be carried out to reduce these costs by exploring different solutions, for example, (i) optimizing the energy consumed by the ball mills [4,5], (ii) automation of the grinding process [6][7][8], or (iii) optimization of maintenance operations. The main purpose of industrial maintenance is to ensure the availability of the production tools.…”

Section: Introductionmentioning

confidence: 99%

Modeling Impulsive Ball Mill Forces Effects on the Dynamic Behavior of a Single-Stage Gearbox

et al. 2022

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Gearboxes are frequently used in the mining industry, especially for power transmission between the electric drive and the ball mill; besides the extreme complexity of a ball mill gear transmission system, the fault diagnosis by vibration analysis can be easily distorted by the presence of impulsive noises due to the ball pulses on the mill shell. Although several works in the literature are related to the influence of an impulsive noise on the accuracy of the diagnosis, no dynamic model exists yet in the literature that can explain the influence of these forces on the dynamic behavior of gearboxes. This paper presents a new approach to determine the influence of the grinding forces in crack defects diagnosis. This approach is based on a hybrid numerical model of a 24-degree-of-freedom gearbox, simulating one gear train and two drive shafts. The impact forces of the mill drum are modelled by a discrete element method (DEM). The ball-filling rate (Fr), the mill speed (Nr), and the ball size (Db) are considered to study this phenomenon. The simulations results show by a time series representation, fast Fourier transform, and short-time Fourier transform (STFT), that the acceleration is significantly affected by the presence of the grinding forces, developing an impulsive noise due to the impact of the balls governed by the studied parameters.

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“…A perspective life-cycle assessment (LCA) was conducted for geopolymer production based on simulated upscaling strategies. A process model based on case studies, such as ore processing has been previously investigated [14][15][16][17][18]; however, the simulation of geopolymer binder production has barely been studied before.…”

Section: Introductionmentioning

confidence: 99%

Potential of Mechanochemically Activated Sulfidic Mining Waste Rock for Alkali Activation

Niu

Adrianto

Escobar

et al. 2021

J. Sustain. Metall.

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Sulfidic mining waste rock is a side stream from the mining industry with a potential environmental burden. Alkali activation is a promising method for transforming mining waste into construction materials. However, the low reactivity of minerals can be a sizeable challenge in alkali activation. In the present study, the reactivity of waste rock was enhanced by mechanochemical treatment with a LiCl-containing grinding aid. X-ray diffraction (XRD) and diffuse reflectance infrared Fourier transform (DRIFT) analysis were utilized to display the structural alteration of individual minerals. A schematic implication of the grinding mechanism of mica was provided according to the results of transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The alkaline solubility displayed the enhanced chemical reactivity of the waste rock, in which Si and Al solubility increased by roughly 10 times and 40 times, respectively. The amorphization of aluminosilicate is achieved through chemical assisted mechanochemical activation. Sulfidic waste rock, as the sole precursor in alkali activation, achieved a 28-day compressive strength exceeding 10 MPa under ambient curing conditions. The simulation of the upscaled grinding process was conducted via the HSC Chemistry® software with a life-cycle assessment. The results showed that mining waste rock can be a promising candidate for geopolymer production with a lower carbon footprint, compared to traditional Portland cement. Graphical Abstract

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Flotation model based on floatability component approach – PGE minerals case

Cited by 8 publications

References 0 publications

Regionalized Life Cycle Inventories of Global Sulfidic Copper Tailings

Regionalized Life Cycle Inventories of Global Sulfidic Copper Tailings

Modeling Impulsive Ball Mill Forces Effects on the Dynamic Behavior of a Single-Stage Gearbox

Potential of Mechanochemically Activated Sulfidic Mining Waste Rock for Alkali Activation

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