Materials Proceedings最新文献_第5页

Assessment of the Advantages and Limitations of Installing PV Systems on Abandoned Dumps 在废弃垃圾场安装光伏系统的利弊评估

Materials Proceedings Pub Date : 2021-12-09 DOI: 10.3390/materproc2021005068

M. Al Heib, A. Cherkaoui

引用次数: 2

Development of Rare Earth Elements Separation Processes from Coal Fly Ash 煤飞灰中稀土元素分离工艺研究进展

Materials Proceedings Pub Date : 2021-12-09 DOI: 10.3390/materproc2021005069

A. Tsachouridis, F. Pavloudakis, N. Kiratzis

引用次数: 1

Preliminary Characterization of Three Metallurgical Bauxite Residue Samples 三种冶金铝土矿渣样品的初步表征

Materials Proceedings Pub Date : 2021-12-08 DOI: 10.3390/materproc2021005066

P. Angelopoulos, Maria Georgiou, Paschalis Oustadakis, M. Taxiarchou, H. Karadağ, Y. Eker, G. Dobra, Alina Boiangiu, Gökhan Demir, S. Arslan, P. Davris, E. Balomenos

{"title":"Preliminary Characterization of Three Metallurgical Bauxite Residue Samples","authors":"P. Angelopoulos, Maria Georgiou, Paschalis Oustadakis, M. Taxiarchou, H. Karadağ, Y. Eker, G. Dobra, Alina Boiangiu, Gökhan Demir, S. Arslan, P. Davris, E. Balomenos","doi":"10.3390/materproc2021005066","DOIUrl":"https://doi.org/10.3390/materproc2021005066","url":null,"abstract":"Bauxite Metallurgical Residue (BR) is a highly alkaline and very fine-grained by-product of the Bayer process for alumina production. Its huge global annual production has resulted in increasing accumulation of BR, causing deposition problems and serious environmental issues. RM contains oxides and salts of the main elements Fe, Al, Ca, Na, Si, Ti, and rare earths—REEs (Sc, Nd, Y, La, Ce, Ds)—many of which have been categorised by EU as critical metals (CMs). The valorisation of BR as a low-cost secondary raw material and metal resource could be a route for its reduction, introducing the waste into the economic cycle. REEScue constitutes a research project that aims to instigate the efficient exploitation of European bauxite residues, resulting from alumina production from Greece (MYTILINEOS SA), Turkey (ETI Aluminium), and Romania (ALUM SA), containing appreciable concentrations of scandium and REEs, through the development of a number of innovative extraction and separation technologies that can efficiently address the drawbacks of the existing solution. The consortium consists of three alumina producers from Greece (MYTILINEOS SA), Turkey (ETI Aluminium), and Romania (ALUM SA) and two academic partners from Greece (National Technical University of Athens) and Turkey (Necmettin Erbacan University). We present preliminary characterization results of three different BR samples that originate from the three aluminium industries, in respect of bulk chemical analysis (XRF, ICP), mineralogical investigation (XRD), and morphological observation through microscopy.","PeriodicalId":18729,"journal":{"name":"Materials Proceedings","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91071040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

CO2-Mineralised Nesquehonite: A New “Green” Building Material 二氧化碳矿化Nesquehonite:一种新的“绿色”建筑材料

Materials Proceedings Pub Date : 2021-12-08 DOI: 10.3390/materproc2021005060

Anthony Kastrinakis, V. Skliros, P. Tsakiridis, M. Perraki

{"title":"CO2-Mineralised Nesquehonite: A New “Green” Building Material","authors":"Anthony Kastrinakis, V. Skliros, P. Tsakiridis, M. Perraki","doi":"10.3390/materproc2021005060","DOIUrl":"https://doi.org/10.3390/materproc2021005060","url":null,"abstract":"Synthetic nesquehonite with a Mg(HCO3)OH·2H2O chemical formula is a solid product of CO2 mineralization with cementitious properties. It constitutes an “MHCH” (magnesium hydroxy-carbonate hydrate) phase and, along with dypingite and hydromagnesite, is considered to be a promising permanent and safe solution for CO2 storage with potential utilization as a supplementary material in “green” building materials. In this work, synthetic nesquehonite-based mortars were evaluated in terms of their compressive strengths. Nesquehonite was synthesized by CO2 mineralization under ambient conditions (25 °C and 1 atm). A saturated Mg2+ solution was used at a pH of 9.3. The synthesized nesquehonite was subsequently studied by means of optical microscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Impurity-free nesquehonite formed elongated fibers, often around a centerpiece, creating a rosette-like structure. The synthesized nesquehonite was mixed with reactive magnesia, natural pozzolan, standard aggregate sand and water to create a mortar. The mortar was cast into 5 × 5 × 5 silicone mold and cured in water for 28 days. A compressive strength of up to 22 MPa was achieved. An X-ray diffraction study of the cured mortars revealed the formation of brucite as the main hydration crystalline phase. Carbon dioxide mineralized nesquehonite is a very promising “green” building material with competitive properties that might prove to be an essential part of the circular economy industrial approach.","PeriodicalId":18729,"journal":{"name":"Materials Proceedings","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83345142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

ΣIDERWIN—A New Route for Iron Production ΣIDERWIN-A铁生产新路线

Materials Proceedings Pub Date : 2021-12-07 DOI: 10.3390/materproc2021005058

Sevasti Koutsoupa, Stavroula Koutalidi, E. Balomenos, D. Panias

{"title":"ΣIDERWIN—A New Route for Iron Production","authors":"Sevasti Koutsoupa, Stavroula Koutalidi, E. Balomenos, D. Panias","doi":"10.3390/materproc2021005058","DOIUrl":"https://doi.org/10.3390/materproc2021005058","url":null,"abstract":"Iron and steel production contributes to ~10% of global CO2 emissions. In recent decades, different scenarios and low-emission pathways have been taken up by steelmaking industries with the collaboration of universities and research institutes to tackle this problem. One of the most promising novel methods to replace the current steelmaking process is the low-temperature electrolysis of iron oxide. This technology is currently being developed under the H2020 ΣIDERWIN project, a European project led by ArcelorMittal, the world’s leading steel and mining company. The ΣIDERWIN project aims at developing an innovative electrochemical process to transform iron oxide into steel metal plates. This process produces steel by electrolysis without direct CO2 emissions. In this operation, electrical energy and iron oxide are converted into chemical energy consisting of separated iron metal from the oxygen gas. It is a disruptive innovation that entirely shifts the way steel is presently produced. One of the advantages of this process is the fact that, in addition to iron oxide (hematite), it is possible to feed this process with other iron-containing raw materials. An alternative raw material which is being studied to be used in this process is bauxite residue (BR), the waste material from the Bayer process for alumina production. The iron oxide of the conversion of bauxite residue to metallic iron is under investigation, and insights are showing that it could follow up the electrochemical route for sustainable iron production. This research deals with the effect of the current density and temperature on current efficiency comparing two different raw materials, pure iron oxide–hematite and bauxite residue.","PeriodicalId":18729,"journal":{"name":"Materials Proceedings","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74991284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Physical Mechanical Properties and Producing Areas of Greek Dimension Stones 希腊维石的物理机械特性和产地

Materials Proceedings Pub Date : 2021-12-07 DOI: 10.3390/materproc2021005064

K. Laskaridis, Angeliki E. Arapakou, Michael Patronis, I. Kouseris

引用次数: 3

Heap Leaching of Greek Low-Grade Nickel Oxide Ores by Dilute Sulphuric Acid at a Pilot-Plant Scale 希腊低品位氧化镍矿石稀硫酸堆浸中试研究

Materials Proceedings Pub Date : 2021-12-07 DOI: 10.3390/materproc2021005065

S. Agatzini-Leonardou, Paschalis Oustadakis, D. Dimaki, J. Zafiratos, P. Tsakiridis, T. Karidakis, E. Frogoudakis, Jacob Drougas

{"title":"Heap Leaching of Greek Low-Grade Nickel Oxide Ores by Dilute Sulphuric Acid at a Pilot-Plant Scale","authors":"S. Agatzini-Leonardou, Paschalis Oustadakis, D. Dimaki, J. Zafiratos, P. Tsakiridis, T. Karidakis, E. Frogoudakis, Jacob Drougas","doi":"10.3390/materproc2021005065","DOIUrl":"https://doi.org/10.3390/materproc2021005065","url":null,"abstract":"The present paper gives the thus far unpublished results of a pilot-scale heap leaching test of a Greek low-grade nickel oxide ore, aiming at verifying, at a large scale, the amenability of Greek laterites to heap leaching by the HELLAS (Heap Leaching LAteriteS) process, developed at the National Technical University of Athens for the first time worldwide and patented by some of the authors as early as in 1991. The test was conducted at the site of Aghios Ioannis mine of G.M.M.S.A. LARCO in 2006–2008 and was financed and supervised by the Institute of Geology and Mineral Exploration (I.G.M.E). The ore sample, 800 t, was from the “Triada” deposit of LARCO, in Euboea, and contained 0.73% nickel, 0.06% cobalt, 35.6% iron and 15% silicon. The ore was ground to −18 mm and the leaching agent was 2N (100 g/L) sulphuric acid solution. The nickel and cobalt recoveries obtained at the time of termination but not completion of the test, after four leaching cycles and 114 days of irrigation, were 60 and 36%, respectively. The corresponding nickel and cobalt concentrations in the produced leach liquor were 3.4 and 0.17 g/L, respectively. The value of the ratio Fe/Ni in the leach liquor was 10/1, much lower than the value 45/1 in the ore, thus showing the selectivity of the leaching of nickel over iron in the Greek ores by the above method. The consumption of sulphuric acid was 66 kg H2SO4/kg Ni recovered. The preliminary feasibility study, that followed the test, confirmed the economic viability of the integrated HELLAS process for the low-grade nickel oxide ores of Greece.","PeriodicalId":18729,"journal":{"name":"Materials Proceedings","volume":"9 21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77773142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Research and Innovation in Exploration and Mining of Raw Materials: The ROBOMINERS Project 原材料勘探与开采的研究与创新:机器人矿工项目

Materials Proceedings Pub Date : 2021-12-07 DOI: 10.3390/materproc2021005059

E. Koutsopoulou, Aikaterini Servou, George Aggelopoulos, K. Laskaridis

{"title":"Research and Innovation in Exploration and Mining of Raw Materials: The ROBOMINERS Project","authors":"E. Koutsopoulou, Aikaterini Servou, George Aggelopoulos, K. Laskaridis","doi":"10.3390/materproc2021005059","DOIUrl":"https://doi.org/10.3390/materproc2021005059","url":null,"abstract":"ROBOMINERS is a new project funded under the European Union’s Research and Innovation Programme Horizon 2020, which aims at employing a bio-inspired robot, focused on the prospect of mineral exploration and extraction within Europe. ROBOMINERS’ innovative approach combines the creation of a new mining ecosystem through the development of a bioinspired robotic miner prototype, able to explore and mine mineral deposits which are currently considered uneconomic due to their small size and difficulty of access. The main objectives of the project include the creation of a European database of potentially suitable locations for the deployment of this novel technology. The building of the pan-EU mineral deposits database is considered vital for the development of the project as it will provide essential information related to deposit type and commodities, spatial and temporal distribution, and location of exploration targets. Several deposits have been reviewed and examined in Greece as potential targets suitable for the ROBOMINERS technology, after considering the specific restrictions and requirements of the project. The main targets have been determined and arranged according to the different aspects required by the applicability of the ROBOMINERS innovative technology.","PeriodicalId":18729,"journal":{"name":"Materials Proceedings","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73902706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Production of Metallic Titanium by Electrowinning in Molten Salts of Titanium Oxycarbide Anode 氧化钛阳极熔盐电积法制备金属钛

Materials Proceedings Pub Date : 2021-12-07 DOI: 10.3390/materproc2021005063

Btissem Malek, J. Serp, F. Doreau, M. Miguirditchian, M. Vandenhende, N. Pradeilles, Y. Lepetitcorps, A. Maître

引用次数: 0

A Hydrometallurgical Process for Cu Recovery from Printed Circuit Boards 一种从印刷电路板中回收铜的湿法冶金工艺

Materials Proceedings Pub Date : 2021-12-03 DOI: 10.3390/materproc2021005056

Dimitrios Vlasopoulos, Paschalis Oustadakis, S. Agatzini-Leonardou, P. Tsakiridis, E. Remoundaki

{"title":"A Hydrometallurgical Process for Cu Recovery from Printed Circuit Boards","authors":"Dimitrios Vlasopoulos, Paschalis Oustadakis, S. Agatzini-Leonardou, P. Tsakiridis, E. Remoundaki","doi":"10.3390/materproc2021005056","DOIUrl":"https://doi.org/10.3390/materproc2021005056","url":null,"abstract":"The current study presents an effort to develop a sustainable hydrometallurgical process for the recovery of copper from waste printed circuit boards (PCBs) to be applied at local small to medium industrial units. The process aims to separate and recover copper from filter dust produced during the crushing of PCBs using a hammer mill in a recycling facility. Due to the high plastic content in the dust (approximately 30% w/w), the metal fraction was separated gravimetrically, and the material originated consisted mainly of Cu (23.8%), Fe (17.8%), Sn (12.7%), Pb (6.3%), Zn (3.4%), Al (3.3%), Mn (1.6%), and Ni (1.5%). Prior to copper recovery, the dust was leached with HCl as a pretreatment step. During this step, more than 80% of iron, zinc, and tin were leached out. The resulting solid consisted mainly of Cu (37.6%) and Fe (10.7%), leading to a copper enrichment of around 60% in the powder. The leaching of copper was conducted in a two-step process using H2SO4 as a leaching agent with the addition of H2O2 as an oxidizing agent. The experimental conditions had low energy requirements (no heating or agitation needed). The leaching of Cu reached 98%. Despite the pretreatment step, the concentration of other metals (Fe, Zn, Ni) in the pregnant solution was too high to proceed to electrowining. Therefore, the organic solvent ACORGA M5640 was selected for the extraction of copper from the pregnant solution. The extraction was conducted in two stages at pH equilibrium 1.5, and the loaded organic phase was stripped with HCl in two steps. The strip liquor was suitable for electrowinning.","PeriodicalId":18729,"journal":{"name":"Materials Proceedings","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88886845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1