The Experts below are selected from a list of 16308 Experts worldwide ranked by ideXlab platform

Yaoli Peng - One of the best experts on this subject based on the ideXlab platform.

  • Recent advances in Beneficiation for low rank coals
    Powder Technology, 2015
    Co-Authors: Yaoli Peng
    Abstract:

    Coal Beneficiation is one of the most effective methods for removing minerals (such as gangues and pyrite) and pollutants (such as sulfur) before the burning of coal. In general, the Beneficiation process of low rank coals is more difficult to achieve than that of bituminous and/or anthracite coals. However, about 50% of the world's total coal deposits are low rank coals. It is urgently required to develop effective Beneficiation technologies for low rank coals. This review highlights recent advances in Beneficiation technologies for low rank coals. Physical (gravity and magnetic separation), chemical (leaching), physico-chemical (flotation and oil agglomeration) and bio-Beneficiation technologies are summarized in detail. Effective Beneficiation technologies for low rank coals in the future are also suggested throughout this paper.

K. Al-tarawneh - One of the best experts on this subject based on the ideXlab platform.

  • Beneficiation of Oil Shale by Froth Flotation: Critical Review
    The Open Mineral Processing Journal, 2014
    Co-Authors: S. Al-thyabat, E. Al-zoubi, Hani M. Alnawafleh, K. Al-tarawneh
    Abstract:

    Oil shale Beneficiation by froth flotation hasn't received enough attention in the last two decades. The reason was the economics of the process as well as its environmental impact. However, the recent surge in oil price and recent developments in fine grinding technologies may improve the efficiency of oil shale Beneficiation by such process. In this work, oil shale concentration by froth flotation technique was critically reviewed. It was found that most of the work was conducted by conventional mechanical flotation using non-ionic collector such as kerosene. Flotation has more pronounced effect on flotation of low grade oil shale; Almost 95% of ash forming minerals were removed to enrich oil shale concentrate by factor of 2-4 with 60-95 % kerogen recovery and approximately 50-300 % increase in oil yield (L/tonne) .Oil shale retorting economics showed that Beneficiation reduced the capital cost for pyrolysis and fractionation by 250 % and spent shale disposal by 270%. However, these saving are offset by the cost of Beneficiation (grinding, flotation, and dewatering). Therefore, the key for economical oil shale concentration process is the reduction of fine grinding costs.

Shulei Song - One of the best experts on this subject based on the ideXlab platform.

  • Progress in developments of dry coal Beneficiation
    International Journal of Coal Science & Technology, 2014
    Co-Authors: Yuemin Zhao, Xuliang Yang, Zhenfu Luo, Chenlong Duan, Shulei Song
    Abstract:

    China’s energy supply heavily relies on coal and China’s coal resource and water resource has a reverse distribution. The problem of water shortages restricts the applications of wet coal Beneficiation technologies in drought regions. The present situation highlights the significance and urgency of developing dry Beneficiation technologies of coal. Besides, other countries that produce large amounts of coal also encounter serious problem of lack of water for coal Beneficiation, such as American, Australia, Canada, South Africa, Turkey and India. Thus, dry coal Beneficiation becomes the research hot-points in the field of coal cleaning worldwide in recent years. This paper systematically reviewed the promising research efforts on dry coal Beneficiation reported in literature in last 5 years and discussed the progress in developments of dry coal Beneficiation worldwide. Finally, we also elaborated the prospects and the challenges of the development of dry coal Beneficiation.

Ali Kiani - One of the best experts on this subject based on the ideXlab platform.

  • Recent advances in the Beneficiation of ultrafine coal particles
    Fuel Processing Technology, 2018
    Co-Authors: Guichao Wang, Xuetao Bai, Ke Liu, Ali Kiani
    Abstract:

    Abstract Only when problems in ultrafine coal particle Beneficiation process are well understood and clarified, efficient methods can be devised to recover ultrafine coal particles in an economically viable way. When minerals are fully liberated from organic substances in the grinding process, coal Beneficiation methods are needed to efficiently separate organic materials from mineral ones. This is necessary for clean coal technologies as the pollutants associated with coal utilization are the key factor in limiting the sustainability of coal utilization. To assess the current state of knowledge available in this area, a comprehensive literature review on the ultrafine coal particle Beneficiation techniques is carried out with main focus on recent progresses. In this paper, previous studies on the ultrafine coal Beneficiation have been critically analyzed with respect to the effects of particle sizes and surface properties. The techniques are classified into two categories, physical separation (including gravity, magnetic and electrostatic separation method) and physico-chemical separation (including oil agglomeration and bubble flotation method). The aim of this paper is to review developments and limitations of current ultrafine coal particle Beneficiation techniques and also to identify the future development in recovering ultrafine coal particles.

M. A. Parvez Mahmud - One of the best experts on this subject based on the ideXlab platform.

  • A global life cycle assessment of manganese mining processes based on EcoInvent database.
    Science of The Total Environment, 2019
    Co-Authors: Shahjadi Hisan Farjana, M. A. Parvez Mahmud, Nazmul Huda, Candace Lang
    Abstract:

    Abstract This paper presents the life cycle assessment (LCA) carried out on the manganese Beneficiation and refining process. This cradle-to-gate analysis is carried out using SimaPro software version 8.5. The considered case is the manganese Beneficiation and refining process, and the final product is 1 kg of refined manganese. The global average dataset is collected from the EcoInvent and AusLCI database, which are originated from literature source. The analysis methodologies considered in this study are the International Life Cycle Reference Data System (ILCD) method and Cumulative Energy Demand (CED) method. A comparative analysis is also presented which compared among ILCD, Australian Indicator, and Tool for Reduction and Assessment of Chemicals and Other Environmental Impacts (TRACI) methods to identify the best practice method for global analysis of mining processes. A detailed sensitivity analysis has been carried out considering different scenarios, to suggest possible solutions to reduce the environmental impacts associated with manganese Beneficiation and refining processes. The analysis results reveal that particulate matter, climate change, categories of eutrophication, human toxicity (cancer and non-cancer effects), and acidification are some of the noteworthy impact categories. The analysis results also showed that coal consumption is significantly higher than other types of renewables and non-renewable energy consumption in manganese Beneficiation and refining processes. The analysis results further reveal that using the chromium steel in manganese Beneficiation process and ferromanganese consumption in the refining process has a significant effect over other materials involved in manganese Beneficiation and refining operations. The obvious reason behind this result is ferromanganese utilization as an energy-intensive process, which in turn increases the environmental emissions. The analysis results also showed that, between the Beneficiation and refining process, manganese refining has a much greater impact on the environment rather than the Beneficiation process due to the fossil fuel and electricity consumption in refining operations.

  • Life cycle analysis of copper-gold-lead-silver-zinc Beneficiation process
    The Science of the total environment, 2018
    Co-Authors: Shahjadi Hisan Farjana, Nazmul Huda, M. A. Parvez Mahmud
    Abstract:

    Gold, silver, lead, zinc, and copper are valuable non-ferrous metals that paved the way for modern civilisation. However, the environmental impacts from their Beneficiation stage was always overlooked. This paper analysed the life cycle environmental impacts from the Beneficiation process of gold-silver-lead-zinc-copper combined production. The analysis is conducted by utilising the SimaPro software version 8.5. The life cycle assessment methodologies followed are the International Reference Life Cycle Data System (ILCD) method, the IMPACT 2002+ method, and the Cumulative Energy Demand Method (CED). The most significant impact categories are ecotoxicity, climate change, human toxicity, eutrophication, acidification, and ozone depletion among nearly 15 impact categories which are assessed in this study. The analysis results from the ILCD method indicate that there is a noteworthy impact on ionising radiation caused by the Beneficiation process. Out of the five metals considered, gold and silver Beneficiation impacts the most while lead‑zinc Beneficiation impacts the least. Gold Beneficiation has most impacts on the category of climate change and ecosystems. Other major impact categories are ionising radiation, terrestrial eutrophication, photochemical ozone formation, human toxicity, and acidification. The IMPACT 2002+ method shows the overall impact is on ecosystem quality and human health from this combined Beneficiation process, dominantly from gold‑silver Beneficiation. The life-cycle inventory results show that the blasting process and the amount of electricity consumption in the Beneficiation process contribute to cause significant amount of environmental impacts. The comparative impact results are presented and discussed in detail in this paper. Sensitivity analyses are presented based on various electricity grid-mix scenarios and energy-mix scenarios, and the results suggest that electricity grid mix has a dominant effect over the fossil-fuel mix. This paper also highlights the potential steps which could cut down the environmental effects by integrating renewable-energy technologies.