Economic and Socio-Environmental Benefits of Dry Beneficiation of Magnetite Ores

Baawuah, Emmanuel; Kelsey, Christopher; Addai‐Mensah, Jonas; Skinner, William

doi:10.3390/min10110955

Cited by 7 publications

(1 citation statement)

References 9 publications

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“…The benefits of using an external magnetic drum magnetic separator are various: [9,10] the material's size range is broad, allowing it to recover fine minerals while separating coarse minerals; magnetic force, gravity, and centrifugal force can all work together to complete the separation, using the specific magnetization coefficient, density, and centrifugal force difference between mineral particles, and the separation efficiency is high [11][12][13][14]. For example, Beijing General Research Institute of Mining and Metallurgy conducts preconcentration of a vanadium-titanium-magnetite in Panxi area [15], with the cylinder speed is increased from 13 r/min to 26 r/min, the pre-discarding tailings rate drops from 28.46% to 23.89%, and the pre-concentration coarse and fine the recovery rates of TiO 2 and TFe in the ore were increased by 2.10% and 3.15%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Separation Analysis of New Magnetic Separator for Pre-Concentration of Ilmenite Particles

Han

Cheng

2022

Minerals

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To achieve the utilization of fine ilmenite (especially −0.075 mm) produced in the titanium-magnetite processing plant in Panzhihua, a radial turbulent outer-cylinder magnetic separator (RTOCMS), was developed in this study. After optimizing the conditions of rotation speed and water flow, an RTOCMS concentrate with TiO2 grade of 22.84% and TiO2 recovery of 66.93% was obtained through one-stage roughing pre-concentration flowsheet. Magnetic force and competing forces were calculated and analyzed to illustrate the pre-concentration mechanism, and the results revealed that the combination of high water flow and high rotation speed resulted in the most effective for pre-concentration of the fine ilmenite in the RTOCMS process. In addition, particle size analysis of the concentrate product indicated that the RTOCMS was effective for the recovery of medium particle sizes (−0.075+0.038 mm), with a continued enhancement for the recovery of fine-grained products (−0.038 mm). Hence, the RTOCMS provides an effective way to pre-concentrate fine ilmenite ore.

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Section: Introductionmentioning

confidence: 99%

Separation Analysis of New Magnetic Separator for Pre-Concentration of Ilmenite Particles

Han

Cheng

2022

Minerals

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Major recent failures in Brazilian mine waste containment facilities, current cases of maximum emergency level and imminent risk of rupture, and a brief sustainability analysis

Fraga Filho,

Aleixo

2024

Environ Sci Pollut Res

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Comparative assessment of life cycle impacts of various plastic waste management scenarios in Johannesburg, South Africa

Mazhandu

Muzenda

Belaid

et al. 2023

Int J Life Cycle Assess

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Purpose Landfilling can result in a loss in revenue that would otherwise have been accrued from recycling plastic waste, loss in potential jobs, and groundwater contamination. Plastics in landfills may also eventually find their way into marine environments, where they can be damaging to animals. This work aims to establish the environmental sustainability of current plastic waste management practices in South Africa using the City of Johannesburg (CoJ) as a case study. Methodology Five scenarios encompassing combinations of landfilling, mechanical recycling, incineration with energy recovery, gasification, and use of plastic waste in a cement kiln were assessed through an environmental Life Cycle Assessment (e-LCA). Scenarios were developed based on an extensive literature review, current practices in South Africa and Europe, and the country’s National Waste Management strategy, which aims to achieve “zero waste to landfill”. SimaPro 9.1.1 software and the Ecoinvent Database were used to assess the life cycle impacts of each scenario over seven impact categories. The ReCiPe endpoint method, Egalitarian version, was employed in determining the impact potentials. A sensitivity analysis was also carried out to evaluate the model’s robustness. Results and discussion Overall, the impact assessment results, including damage assessments and single score results, revealed that moving away from landfilling and combining mechanical recycling, incineration, gasification, and use of plastic waste (PW) as solid refuse fuel in a cement kiln is the least environmentally impactful scenario when managing plastic waste. Landfilling alone was the worst-performing scenario, resulting in adverse effects on human health, ecosystems, and resource depletion. This agrees with the waste hierarchy. On sensitivity analysis, the increase in transportation distances and reduction in market substitution factor in mechanical recycling did not change the ranking of scenarios despite reducing the net benefits to the environment. Including open dumping as an end-of-life scenario significantly increased the negative impact of the current plastic waste management scenario being practised in South Africa, while assuming a 100% mechanical recycling rate had the least environmental impact when compared to the other modelled scenarios. Conclusions The current plastic waste management practices in South Africa were found to be environmentally unsustainable based on the modelled scenarios, and a move away from landfilling is encouraged. The outcomes of this study will assist policymakers and other stakeholders in making informed decisions based on scientific evidence when formulating sustainability-related waste management policies.

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Economic and Socio-Environmental Benefits of Dry Beneficiation of Magnetite Ores

Cited by 7 publications

References 9 publications

Separation Analysis of New Magnetic Separator for Pre-Concentration of Ilmenite Particles

Separation Analysis of New Magnetic Separator for Pre-Concentration of Ilmenite Particles

Major recent failures in Brazilian mine waste containment facilities, current cases of maximum emergency level and imminent risk of rupture, and a brief sustainability analysis

Comparative assessment of life cycle impacts of various plastic waste management scenarios in Johannesburg, South Africa

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